JellyFish filter Technical manual Issue 2

Transcription

1 JellyFish filter Technical manual Issue 2 Filter

2 Contents JellyFish filter 1 System components 2 Membrane filtration cartridge 4 System operation 5 Self-cleaning functions 6 System performance 7 Treatment efficiency 7 Inlet and outlet pipes 7 System options 8 Design information 9 Configurations and design capacities 9 Bypass design 10 Shallow or low cover installations 11 Submerged (tidal/tailwater) installations 11 Series JellyFish filter 11 System installation 11 Inspection and maintenance 11 Replacement parts 11 Humes Water Solutions 12 Appendices 13 Contact information 21

3 JellyFish filter The JellyFish filter is a tertiary stormwater treatment system featuring membrane filtration to provide exceptional pollutant removal at high treatment flow rates with minimal head loss and low maintenance costs. JellyFish filter The JellyFish filter uses gravity, flow rotation, and up-flow membrane filtration to provide tertiary treatment to stormwater in an underground structure. Using unique filtration cartridges, each JellyFish filter provides a large membrane surface area, resulting in high flow rates and pollutant removal capacity. The JellyFish filter efficiently captures a high level of stormwater pollutants, including: Total Suspended Solids (TSS), median removal efficiency of 85%, including particles down to two microns Total Nitrogen (TN), median removal efficiency of 51% Total Phosphorous (TP), median removal efficiency of 59% Total Copper (Cu), median removal efficiency of 90% Total Zinc (Zn), median removal efficiency of 70%. Designed as a polishing device for constrained sites, the JellyFish filter is available in a range of sizes to cater for both at-source and end-of-pipe solutions. The system provides tertiary level performance with a small footprint The proven performance of the JellyFish filter and high flow rate membranes enables water quality objectives to be met with a smaller footprint system than typical bioretention systems. It has been independently researched and proven The JellyFish filter has been independently researched under laboratory conditions in Australia and both laboratory and field conditions in the United States. In the United States, it has received verification under the stringent New Jersey Corporation for Advanced Technology (NJCAT) protocol. It treats higher flow rates than most filters Each filter cartridge has an effective filter area of 35.4 m 2 designed to treat 5 litres per second (L/s) through operational filters. Above-ground land use is maintained The system is assembled within a fully-trafficable, precast concrete structure for underground installations on constrained sites, allowing maximum use for above-ground activities. Maintenance is easy The filter backwashes after peak flows so it can self-clean several times in each storm event. Manual backwash is recommended annually. When cartridge replacement is required (usually every three years), it is a safe and simple process. We provide world class treatment solutions Humes has a team of water specialists dedicated to delivering sustainable solutions, creating maximum value for your project, accommodating your site conditions, design requirements and construction factors. JellyFish filter 1

4 System components The JellyFish filter is comprised of several structural and functional components: A cylindrical precast concrete structure which is available in a range of diameters and depths that serves as a vessel providing structural support for a 50 year design life and provides storage for accumulated sediment. A rigid high-strength fibreglass cartridge deck separates the vessel into a lower chamber and upper chamber, houses the filter cartridges, provides a surface and flow path for treated water to the effluent pipe, provides containment of oil and other hydrocarbons below deck and provides a platform for maintenance personnel to safely service the filter cartridges. The lower chamber provides storage for pollutant separation and membrane filtration. The upper chamber provides adequate clearance for inspection and maintenance. A rigid high-strength fibreglass Maintenance Access Wall (MAW) attenuates influent water velocity and directs flow into the lower chamber through a large opening in the cartridge deck. In addition, it provides storage for floatable pollutants that may have bypassed the upstream Gross Pollutant Trap (GPT). It also serves as an inspection and maintenance access point. JellyFish membrane filtration cartridges are secured to the deck by the cartridge lids. Each filter cartridge consists of multiple filter tentacles, which treat the stormwater by filtering out fine suspended particulates (TSS) and particulate-bound pollutants on the membrane of each tentacle. Filtered water passes through the membranes, up the centre tube of each tentacle and exits through the top. Filter cartridges are designated as either high-flow or draindown cartridges, depending on their location in the cartridge deck. High-flow cartridges placed within the backwash pool are automatically backwashed after each storm event. Draindown cartridges located outside the backwash pool facilitate the draindown of the backwash pool. The design flow rate (2.5 L/s) of a draindown cartridge is controlled by the lid orifice. The lower design flow rate of the draindown cartridge ensures the membranes last for longer periods between scheduled maintenance. Cartridge lids are fastened into the deck to securely anchor the filter cartridges. The lids are removable to allow manual backflushing and replacement of the filter cartridges when required. Cartridge lids contain a flow control orifice that is specifically sized for use with high-flow and draindown cartridges. Blank lids have no orifice and are used to cover unoccupied deck apertures in systems that do not use the full rated flow capacity of the system. A rigid fibreglass backwash pool weir extends 150 mm above the cartridge deck and encloses the high-flow cartridges. During inflow, filtered water leaving the high-flow cartridges forms a pool inside the weir. When the water level in the pool exceeds the weir height it overflows and spills to the cartridge deck where it then flows to the outlet pipe. As the inflow event subsides and pressure decreases, water in the backwash pool reverses flow direction and automatically backwashes the high-flow cartridges, cleaning the membrane surfaces. Water in the lower chamber (below deck) is displaced through the draindown cartridges. This self-cleaning mechanism may occur multiple times during a single storm event as rainfall/runoff intensities rise and fall, thereby significantly extending the service life of the cartridges and the maintenance interval. 2 JellyFish filter

5 A separator skirt encloses the filtration cartridge and defines the filtration zone. The separator skirt extends the full length of the filtration tentacles and prevents contamination of the membranes with oil and floatable debris. The separator skirt also forces water to enter the filtration zone under low velocities. The separator skirt is attached to the underside of the cartridge deck. Large diameter access lids are installed at the surface and are removed to allow access for maintenance of the system. The upper chamber is designed with tapered surrounds to match with finished surface grades. The JellyFish filter and components are depicted in Figure 1 below. JellyFish filter As an option, the inlet pipe can be located below the deck for drainage networks with deep invert levels. In these systems, a deflector plate is installed across the inlet pipe to induce tangential water flow through the channel between the chamber wall and separator skirt. Figure 1 JellyFish filter components Maintenance access wall Outlet Inlet Draindown cartridge Backwash pool High-flow cartridges Cartridge deck Separator skirt JellyFish filter 3

6 Membrane filtration cartridge Figure 2 JellyFish membrane filtration cartridge The JellyFish filter utilises multiple lightweight membrane filtration cartridges. Each cartridge consists of multiple removable filter elements ( filtration tentacles ) attached to a cartridge head plate. Each filtration tentacle consists of a central perforated tube surrounded by a specialised membrane. A removable oil-resistant polymeric gasket provides a watertight seal between the cartridge and the deck. A JellyFish membrane filtration cartridge is depicted in Figure 2. Tentacles Head plate Attachment nuts Lifting loops Gasket The cartridge length is 1,372 mm. The dry weight of a new cartridge is less than 9 kg, and the wet weight of a used cartridge is less than 23 kg. No heavy lifting equipment is required during exchange. The filtration tentacle membranes provide a large surface area, resulting in high flow and suspended sediment removal capacities. A typical JellyFish cartridge with 11 filtration tentacles has 35.4 m 2 of membrane surface area. Hydraulic testing on clean filter cartridges demonstrated a flow rate of 11.3 L/s at 455 mm of driving head. Extensive independent field testing, including testing at an urban site with high intensity rainfall and runoff, has demonstrated consistently high pollutant removal performance with a conservative design flow rate of 5 L/s for the high-flow cartridges and 2.5 L/s for the draindown cartridges. These values translate to a conservative design membrane filtration flux rate (flow per unit surface area) of 0.14 L/s/m 2 for the high-flow cartridge and 0.07 L/s/m 2 for the draindown cartridge. In addition, the filtration membrane has been treated to allow biofilm to grow but not clog the pores of the membrane. The flow rating of a particular JellyFish filter cartridge is based on the membrane filtration surface area of the cartridge and data collected from both laboratory testing and field testing. The cartridge deck contains apertures for each filter cartridge. 4 JellyFish filter

7 System operation As a tertiary treatment system, the JellyFish filter is designed to be an offline structure, as part of a treatment train. For effective operation, the system requires a difference in elevation between upstream and downstream water levels. Typically, a minimum 455 mm of driving head is designed into the system but may vary from 305 mm to 610 mm depending on specific site requirements. The JellyFish filter uses gravity, flow rotation and membrane filtration treatment to remove pollutants from stormwater runoff. These functions are depicted in Figure 3 below. Gravitational forces remove coarse sediment (generally >50 microns), particulate-bound pollutants (nutrients, toxic metals, hydrocarbons), free oil and floatable trash and debris (that may bypass upstream primary treatment devices). Large, heavy particles fall to the sump (sedimentation) and low specific gravity pollutants rise to the surface (floatation) behind the MAW. Treatment begins when flow enters the system through the inlet pipe (standard). Below-deck inlet pipes are offered as an option. Influent enters the MAW zone and passes through a large opening in the deck to the lower chamber. The large deck opening and change in flow direction attenuate the influent flow velocity. Buoyant pollutants remain on the surface in the MAW zone. JellyFish filter Figure 3 JellyFish filter functions Outlet Inlet Gravitational particles settling Flow rotation Membrane filtration JellyFish filter 5

8 Flow into the lower chamber must then pass tangentially around the separator skirt protecting the cartridges and increasing the flowpath length. Coarse sediment settles out of the MAW zone into the sump. As water flows tangentially around the separator skirt in the lower chamber, the large opening in the bottom of the separator skirt and upward change in direction further reduces flow velocity and enhances particle separation. As a result, sediment settles in the sump. Flows pass through the cartridge in the filtration zone. Each filter cartridge consists of multiple tentacles. Hydraulic pressure across the entire membrane surface area causes water to penetrate the filtration tentacles. Water enters the membrane pores radially and deposits fine particulates on the exterior membrane surface. Filtered water flows into the centre drain tube of each tentacle, the water then flows upward and out the top. Water exiting the top of the tentacles combines under the lid, where the combined flow exits the cartridge through the orifice with a pulsating fountain effect into the backwash pool. When the water level in the backwash pool exceeds the weir height it overflows to the outlet pipe. Outside the backwash pool, the draindown cartridge provides treatment at a reduced flow rate (2.5 L/s) and allows the treated water captured in the backwash pool to return through the cartridges and balance water pressure as the storm event ends. As particles build up on the external membrane surface, the pores progressively become smaller. This process, referred to as filter ripening, significantly improves the removal efficiency relative to a brand new or clean membrane. Filter ripening accounts for the ability of the JellyFish filter to remove particles finer than the nominal pore size (20 microns) rating of the membranes. An animation of the JellyFish filter operation and maintenance is available at humeswatersolutions.com.au. Self-cleaning functions The JellyFish filter utilises several self-cleaning processes to remove accumulated sediment from the external surfaces of the filtration membranes, including automatic backwash of the high-flow cartridges, vibrational pulses, and gravity. These processes have been confirmed by more than 12 months of full scale prototype testing. Combined, these processes significantly extend the cartridge life, maintenance interval and reduce life-cycle costs. Automatic backwash occurs with the high-flow cartridges at the end of each runoff event. This can occur multiple times during a single storm event as intensity and driving head varies. As the inflow subsides and driving head decreases, water in the backwash pool reverses flow direction and automatically backwashes the high-flow cartridges, removing sediment from the membrane surfaces. Water in the lower chamber (below deck) is displaced through the draindown cartridges. Vibrational pulses occur as a result of complex and variable pressure and flow direction conditions that arise in the deck during operation. During forward flow a stream of filtered water exits the top of each filtration cartridge and encounters resistance from the turbulent pool of water in the backwash pool. Water is forced through the cartridge lid orifice into the backwash pool with a pulsating fountain effect. The resulting pulses transmit vibrations through the deck to the membranes, thereby dislodging accumulated sediment. The effect is pronounced at higher flow rates, and influences all cartridges. Accumulated sediment on the membranes will settle under gravity both during inflow events and inter-event dry periods. As fine particles form into larger masses on the membrane surface, adhesion to the membrane surface lessens, and sediment sheds away from the membrane. Chemical processes and biofilm effects also play a role. 6 JellyFish filter

9 System performance The JellyFish filter has been designed to provide tertiary level treatment and should be combined with a Gross Pollutant Trap (GPT) as part of a treatment train to ensure optimal performance. Treatment efficiency Inlet and outlet pipes An above-deck inlet pipe configuration is standard for the JellyFish filter and an optional below-deck inlet configuration is available on request. Specific site constraints generally determine the configuration that is most favourable. In both configurations, the invert level of the outlet pipe is identical to the cartridge deck elevation. JellyFish filter Extensive research of the JellyFish filter has proven its performance under Australian laboratory and US field conditions. Field testing in the United States has received independent verification under the stringent New Jersey Corporation for Advanced Technology (NJCAT) protocol. The results are summarised in Table 1 below. Table 1 JellyFish filter performance summary Pollutant Median reduction TSS 85% TP 59% TN 51% Cu 90% Zn 70% Total oil and grease 62% Reference: University of Florida (2011). JellyFish filter 7

10 System options The JellyFish filter can be customised to suit your project requirements. As each treatment train is unique and units are designed to match surface levels, please contact Humes Water Solutions for assistance, however, Table 2 below can be used as a guide. Table 2 JellyFish filter model range and details JellyFish model Number of high-flow cartridges JF Number of draindown cartridges Inlet pipe diameters (mm) Treatment flow (L/s) JF JF JF JF JF JF JF JF JF JF JF JF JF JF JF JF JF JF JF JF JF JF JF JF JF JF JF JF Nominal structure diameter (mm) Depth to outlet invert (mm) 1,100 1,382 min 1,800 1,539 min 2,400 1,415 min 3,000 1,602 min 350 mm intervals 3,600 2,045 min Total structure height (mm) 3,500 min 6,500 max 3,828 min 6,500 max 3,715 min 6,500 max 3,900 min 6,500 max 350 mm intervals 4,335 min 6,500 max Note: Designers should allow for upstream and downstream bypass pits and a bypass pipe link in a triangular configuration. 8 JellyFish filter

11 Design information The JellyFish filter has many flexible design features to accommodate a wide range of specific site requirements and constraints. Please contact Humes Water Solutions for assistance. Configurations and design capacities Design flow capacities and pollutant capacities for standard JellyFish filter configurations are shown in Table 2 on the previous page. The JellyFish filter standard model numbers provide information about the manhole inside diameter and cartridge counts for high-flow and draindown cartridges. For example, the JellyFish filter model number JF is an 1,800 mm diameter structure with five high-flow cartridges and one draindown cartridge. For the standard above-deck inlet pipe configuration, the invert elevation of the inlet pipe is typically set 150 mm higher than the invert elevation of the outlet pipe. This generally ensures that the inlet pipe will drain completely after each rainfall/runoff event, while providing sufficient volume within the MAW zone for surface accumulation of floatables below the inlet pipe. The elevation of the inlet pipe can be varied as required. The JellyFish filter can accommodate a range of angles between the inlet and outlet pipes. Standard outlet pipe locations are within a 180 span about the circumference of the structure (refer to Figure 4 below). The separation angle relationship of the inlet pipe to the outlet pipe can vary from 90 to 270 degrees to provide maximum design flexibility. Contact Humes Water Solutions for assistance with angles outside this range. The JellyFish filter can be installed at a range of depths of cover as presented in Table 2. JellyFish filter With systems using an external bypass from an upstream diversion structure, the driving head is calculated as the difference in elevation between the top of the diversion structure weir and the invert of the JellyFish filter outlet pipe. A minimum of 455 mm is required to drive the flow through the JellyFish filter at the rates shown in Table 2. Figure 4 Typical JellyFish filter outlet locations Inlet Outlet Recommended design flows of 5 L/s for high flow cartridges and 2.5 L/s for draindown cartridges are to ensure longevity of the filter. Submerged or backwater conditions may be accommodated in some circumstances and assistance from Humes Water Solutions engineers is recommended. JellyFish filter 9

12 Bypass design The JellyFish filter should be designed with an offline configuration for most catchments. All stormwater filter systems will perform for a longer duration between required maintenance services when designed and applied in offline configurations. A standard offline configuration has an external bypass that uses an upstream diversion structure. The elevation difference between the top of the diversion structure weir and the JellyFish filter outlet pipe invert should be a minimum of 455 mm. Excess flow that overflows the diversion weir, bypasses the JellyFish filter. For smaller sites an online configuration might be more suitable. In these cases, an optional internal bypass pressure relief pipe(s) can be placed in one or multiple cartridge receptacles within the JellyFish filter. The pressure relief pipe height and diameter can be varied to accommodate the design peak flow rate and system driving head requirements. For these systems, the driving head is calculated as the difference in elevation between the top of the pressure relief pipe and the invert of the outlet pipe. When the internal bypass option is utilised, peak flow rates receive membrane filtration treatment up to the filtration design flow rate, with the balance of the peak flow receiving primary treatment only. In these cases, increased sump depth may be required to increase sediment storage capacity and to minimise re-suspension of previously captured sediment at peak flow rates. Contact Humes Water Solutions for design assistance. Figure 5 JellyFish filter offline layout Bypass Junction pit Diversion manhole Treatment flow Flow JellyFish filter 10 JellyFish filter

13 Shallow or low cover installations The recommended minimum depth to outlet invert level is 1,040 mm. For sites that require less depth of cover, the JellyFish filter can be adapted, however, this will decrease accessibility for maintenance. Contact Humes Water Solutions for assistance. System installation The JellyFish filter can be installed by a civil or plumbing contractor in much the same way as a manhole or other stormwater drainage structures. It is supplied on-site in separate, easily identifiable components, with an upstream bypass pit and downstream junction pit. JellyFish filter Submerged (tidal/tailwater) installations The JellyFish filter is designed to function optimally under free-surface flow conditions. For systems that may experience submerged or backwater conditions due to tailwater or tidal effects, driving head calculations must account for water elevation during the backwater condition. The JellyFish filter treatment functions will continue to operate despite backwater conditions. A customised design will be required to ensure litter capture and backwash. Contact Humes Water Solutions for assistance. Series JellyFish filter The JellyFish filter is lowered into place by a crane or excavator, the components interlock and the tapered surround can be rotated to match a surface grade (if the system is located in road pavement). The system arrives to the site with the internal parts fully assembled. Inspection and maintenance For inspection and maintenance information, please refer to the JellyFish filter owner s manual. An animation of the JellyFish filter operation and maintenance is available at; humeswatersolutions.com.au. For sites with water quality treatment flow rates that exceed the design flow rate of the largest standard JellyFish filter model, custom systems can be designed that hydraulically connect multiple JellyFish filters in series. For any design questions or custom modifications, contact Humes Water Solutions for assistance. Replacement parts Replacement parts for the JellyFish filter can be ordered by contacting Humes Water Solutions at; National sales or via the contact section at humeswatersolutions.com.au. JellyFish filter 11

14 Humes Water Solutions Humes Water Solutions is a specialist division within the Humes business, dedicated to the provision of stormwater treatment, harvesting and reuse, and detention solutions. Humes now operates 16 accredited plants (ISO9001) and 20 sales offices to provide a truly national footprint and meet the needs of our customers irrespective of their location. Our team has been developed to provide an unparalleled depth of knowledge and experience for our customers, which takes Humes Water Solutions beyond the traditional barriers of company-based solutions. A combination of graduate and post graduate personnel with working backgrounds in the private and public sector ensures the delivery of well-measured and practical advice for our customers. Our range of stormwater solutions also includes our multi-award winning* RainVault harvesting and reuse system, and the new StormTrap detention system. For Humes and its parent company, Holcim Ltd, sustainable development is a key priority. Our stormwater treatment products demonstrate our commitment to protecting the environment. We are dedicated to the development and protection of our water resources and to this end, we undertake rigorous research and development of our products, stay abreast of stormwater issues and solutions around the world, and publish peer-reviewed technical papers on issues relevant to the stormwater industry. As a part of the Humes business, Humes Water Solutions has access to a national infrastructure, a dedicated engineering design team, and over 100 years design, manufacturing and construction experience. For more information on any of our products, or for a selection of technical papers published by Humes Water Solutions, please visit us at humeswatersolutions.com.au. * 2008 Winner - Excellence in Stormwater Harvest & Reuse for the Riverstone Crossing RainVault from the Stormwater Industry Association Fieldforce Environmental Product of the Year Award from the Master Plumbers and Mechanical Services Association of Australia CivEnEx - Most Innovative Product. 12 JellyFish filter

15 Appendices JellyFish filter standard drawings JellyFish filter design/quotation request JellyFish filter inspection and maintenance log JellyFish filter JellyFish filter 13

16

17

18

19

20

21 Humes Holcim (Australia) Pty Ltd ABN Little Cribb st Milton QLD 4064 Australia JellyFish filter design/quotation request Phone (07) Fax (07) Date: Project information: Consultant information: Project number: Project name: Closing date: Jobsite address: State: Contact name: Company: Phone number: Fax number: Land use (tick one): Commercial Service station Government Industrial Mine site Road/hardstand Residential Other JellyFish filter information Structure number: Surface level: Inlet invert level: Outlet invert level: Inlet pipe diameter (mm): Outlet pipe diameter (mm): Pipe material: Latitude/longitude: / Load class (circle one option): D / G Inlet configuration (circle one option): Above deck / below deck JellyFish model required (circle model number) Offline system Desired JellyFish filter outlet orientation 90 JF JF JF JF JF JF JF JF JF JF JF JF JF JF Inlet pipe 180 JF JF JF JF JF JF JF JF JF JF JF JF JF JF JF Please complete this form and to: info@humeswatersolutions.com.au

22 Humes Holcim (Australia) Pty Ltd ABN Little Cribb st Milton QLD 4064 Australia JellyFish filter inspection and maintenance log Phone (07) Fax (07) Owner: Location: GPS coordinates: JellyFish filter model number: Land use: Commercial: Industrial: Service station: Road/highway: Mine site: Residential: Other: Date: Time: Inspector Maintenance contractor Visible oil present (Y/N) Oil quantity removed (Y/N) Floatable debris present (Y/N) Floatable debris removed (Y/N) Water depth in backwash pool Draindown cartridges backflushed (Y/N) Draindown cartridges externally rinsed and re-commissioned (Y/N) New tentacles put on draindown cartridges (Y/N) High-flow cartridges backflushed (Y/N) High-flow cartridges externally rinsed and re-commissioned (Y/N) New tentacles put on high-flow cartridges (Y/N) Sediment depth Sediment removed (Y/N) Cartridge lids intact (Y/N) Other comments: (Deck condition, blockages of upstream/ downstream junctions, skirts, etc..)

23 Contact information National sales humeswatersolutions.com.au Head Office New South Wales Tasmania 18 Little Cribb St Milton 4064 QLD Ph: (07) Fax: (07) Queensland Brisbane/Gold Coast Ph: (07) Fax: (07) Rockhampton Ph: (07) Fax: (07) Sunshine Coast Ph: (07) Fax: (07) Townsville Ph: (07) Fax: (07) Grafton Ph: (02) Fax: (02) Newcastle Ph: (02) Fax: (02) Sydney Ph: (02) Fax: (02) Tamworth Ph: (02) Fax: (02) Victoria Echuca Ph: (03) Fax: (03) Melbourne Ph: (03) Fax: (03) Launceston Ph: (03) Fax: (03) South Australia Adelaide Ph: (08) Fax: (08) Western Australia Gnangara Ph: (08) Fax: (08) Perth Ph: (08) Fax: (08) Northern Territory Darwin Ph: (08) Fax: (08)

24 National sales humeswatersolutions.com.au A Division of Holcim Australia This brochure supersedes all previous literature on this subject. As the specifications and details contained in this publication may change please check with Humes Customer Service for confirmation of current issue. This document is provided for information only. Users are advised to make their own determination as to the suitability of this information for their own specific circumstances. We accept no responsibility for any loss or damage resulting from any person acting on this information. Humes is a registered business name of Holcim (Australia) Pty Ltd. The JellyFish filter is manufactured, marketed, and sold by Humes Water Solutions under licence from Imbrium Systems Inc, Canada. JellyFish is a registered trademark of Imbrium Systems Inc, Canada and is used in Australia under license. Humes is a registered trademark of Holcim Australia Pty Limited. JellyFish is registered pursuant to Australian Patent Application No (PCT/US08/73311), US Patent Application No. 11/839,303 and 12/014,888 and International Publication No. WO 2009/ A1. Rainvault is a registered trademark of Holcim (Australia) Pty Ltd. StormTrap is a registered trademark of StormTrap LLC. January 2014 Holcim (Australia) Pty Ltd ABN