MCBERNS ZC SERIES ODOUR FILTERS STANDARD SPECIFICATION

Transcription

1 MCBERNS ZC SERIES ODOUR FILTERS STANDARD SPECIFICATION 1 INTRODUCTION The McBerns ZC series odour filters are designed for sewage pump stations, trunk sewerage systems, storage tanks, sewer air release valves, sewer pressure main discharge MH s and treatment plants. Sewers over 150mm diameter and air valves over 100mm diameter require air flow rate and H 2S gas testing or modelling to determine which model of ZC odour unit is required. Depending on the number and configuration of the ZC units in place, extracted air flow rates can be designed to suit the odour unit s treatment capacity, operation and maintenance requirements. The ZC series filters achieve up to 99.9% H 2S gas removal through adsorption and treatment processes when installed and operated in accordance with product specifications. Olfactory Unit removal rates have yet to be determined. 1.1 Background The McBerns odour filters utilise a combination of zeolites, oxidising agents and micro-porous, impregnated, pelletised activated carbon media for the treatment of waste airstreams containing noxious gases. 1.2 Scope This standard specification details design and performance requirements for the McBerns combined media filters suitable for odour reduction at sewage pumping stations and in the sewerage network. 1.3 Application The McBerns filters provide a means of odour management by removing odours in waste air streams. Gases may contain toxic and odorous compounds, including hydrogen sulphide gas, acidic gases, volatile organic compounds (VOC s) and hydrocarbons. The combined media filters operate by adsorbing and retaining chemical compounds, which may undergo chemical conversion and/or biological treatment 2 MATERIALS AND COMPONENTS The ZC series odour filters are constructed from stainless steel with a combination of upvc replaceable cartridges and an activated carbon treatment zone. All ZC series odour filters have an anti-corrosion internal coating. All fixtures are stainless steel and outlets/drain valves are a combination of upvc and Polyethylene (PE). Where required, filter media is separated by PET mesh. Rubber seals are used to seal cartridges to the filter body. The cartridge media is blended to suit the waste airstream being treated. Odour filter materials and components adhere to the following standards and/or McBerns documentation: McBerns product-specific odour filter general arrangement drawing including schedule of individual components and schedule of materials Pipework and fittings in accordance with all relevant Australian Standards

2 Container upvc or steel components in accordance with all relevant Australian Standards including but not limited to: o AS/NZS :2011 Welding of steel structures o AS/NZS 1260:2009 PVC-U pipes and fittings for drain, waste and vent applications o AS/NZS 1477 PVC pipes and fittings for pressure applications o AS/NZS 5065:2005 Polyethylene and polypropylene pipes and fittings for drainage and sewerage applications o AS/NZS 2032:2006 Installation of PVC systems Mechanical Exhaust Fan Seat-Ventilation Storm Series 10, 12 & 14 and SEAT Series 15, 20, 25, 30, 35 & 50 Technical Data Sheets Ventilator (i.e. on optional vent pole) Edmonds Hurricane S2 Ventilator, Technical Data Sheet No Filter cartridge - AS/NZS 1260:2009 PVC-U pipes and fittings for drain, waste and vent applications Filter media Refer to McBerns media product specifications and MSDS relevant to each product. 2.1 Corrosion-Resistant Materials The enclosure for the ZC Series filters shall be austenitic stainless steel complying with ASTM A276 or ASTM A480M, series 300, containing not less than 8% nickel. ZC series odour filters are internally and externally coated with anti-corrosion coatings. 2.2 Sealing Gaskets Gaskets shall be resistant to the sewage gases, temperature or environmental conditions to which the gasket will be subjected in service. 2.3 Filter Media The filter media shall have: Proven capabilities to absorb and treat odours and chemical compounds from the waste airstream by adsorption and chemical conversion Adequate surface area in the filter media to treat the specified concentrations and air flow rates of the waste airstream. 3 DESIGN The combined filter media shall meet the following design requirements: The filter media is a homogeneous material that provides uniform airflow distribution and maintains a low gas head loss (i.e. low resistance to air flow) Treatment capacity meets or exceeds the project specific design requirements Resistance to corrosion is a key design input due to the nature of gases being treated Ongoing operation and maintenance costs and labour are considered. Refer to Appendix A Technical Data and the relevant ZC series general arrangement drawing for model specific performance and technical specifications.

3 3.1 General Performance McBerns ZC series odour filters are designed to achieve up to 99.9% H 2S gas reduction in non-condensed air at the specified gas concentration range and for a nominated contact time of 3, 5 or 10 seconds depending on waste air stream characteristics, while operating within a temperature range of C. 3.2 Dimensions The dimensions of the odour filter shall be determined by the gas concentration and flow rate of the inlet waste airstream. The dimensions of the odour filter housing shall be in accordance with the published product specification and site specific requirements. 3.3 Design Loads The odour filter compartment shall be an enclosed design structurally engineered in accordance with AS/NZS 1170:2002 Structural design actions general principles, to enable transport and placement at site on a suitable foundation. On-site assembly of components, mainly upvc connectors, may be required. Vandalism proof measures shall be incorporated in the overall site design. 3.4 Fasteners Stainless steel fasteners such as bolts, screws, nuts and washers shall comply with AS :2000, AS :2000, AS and AS Filter Media Compartments The filter media compartments are designed to: Support the filter media in separate layers so as to resist filter media compaction over time Permit easy access for maintenance and filter media/cartridge exchange Permit safe handling and replacement of media/cartridge Be free draining to prevent water-logging of the filter media Be individually isolated for maintenance or media replacement. The design shall address ongoing odour management while the filter system is being maintained or the media is being replaced Be self-draining back to the sewer system. 3.6 Extractor Fan The extractor fan is constructed from corrosion-resistant materials and sized for the design air flow rate and pressure loss across the filter system. Extraction fans shall comply with the noise limitations set by the relevant Environmental Regulator. Extraction fan motors shall have a minimum rating of IP56 with minimum Zone 2 classification as per AS 1939:1990.

4 3.7 Remote Gas Monitoring ZC Series filters can be fitted with remote H2S gas monitoring equipment, control functionality and data transfer capabilities with numerous options. Acceptable solutions include: The PrimaXP Gas Monitor, supplied by MSA, provides IP66 protection, an intrinsically safe enclosure, H2S gas detection up to 100ppm, optional pipe mount kit, 4 20 ma output with optional HART protocol and two relays The OdaLog RTx logger, supplied by ThermoFisher, provides wireless data transfer via built-in modem, internal lithium batteries, IP66 protection, H2S gas detection up to 200ppm or 1000ppm, proprietary software, surface mount antennae and optional GPS The Q45S supplied by Hydramet and manufactured by ATI incorporates a sensor designed to operate in condensing gas streams by purging accumulated droplet water from the face of the sensor insures long-term operation. The unit also comes with Two Internal Alarm Relays that are programmable for setpoint, hysteresis, and delay functions, an LCD Display showing gas concentration, a second information line indicating raw sensor output, ma output, and other information and a four key front panel, an Internal Data Logger available in the battery-powered version, storing up to 10 days of data at one minute storage intervals, Output Simulation which transmits analog output set to user definable values and relay outputs set to specific states for complete simulation of detection system operation with output and alarms inhibition for maintenance and calibration and a Weather-proof Nema 4X Enclosure with transmitters are designed for operation in typical wastewater treatmentplant environments and electronic assembly that is CSA/UL certified 3.8 Interchangeability All components shall be interchangeable between odour filters of the same size or type either supplied or manufactured by McBerns. The ZC series odour filters are modular in design. Odour filter system requirements may necessitate units to be placed in parallel in order to achieve the design treatment capacity. 3.9 Asset Life Stainless steel and stainless steel fittings have a 10 year life All upvc and PE fittings have a 10 year life All coatings have a 5 year life Installation Refer to the McBerns product specific installation instruction sheet. 4 COMMISSIONING & TESTING It is not possible to conduct treatment performance tests prior to installation and commissioning as each site will have unique and varying waste air stream concentrations and flow rates. It is recommended that following installation, conduct inlet and outlet H2S gas and air flow rate monitoring over a period of two (2) to four (4) weeks to establish the H2S gas levels from the source and to determine the odour filters treatment efficiency under those conditions. It is most advantageous to conduct this testing during the warmest months of the year and during the highest air flow rates. Sampling and testing is conducted in order to verify that the system achieves the specified H2S gas reduction. Measure and record the noise levels adjacent to the site throughout the commissioning period to verify that the installation meets noise limitations set by the environmental regulator.

5 If the filter fails to achieve the specified H2S gas reduction or operate within specified noise requirements after the initial testing phase, faults shall be identified and corrected prior to re-testing. Following a further period of 2-4 weeks, repeat testing to ensure the filter is capable of meeting the performance specification. 5 OPERATION & MAINTENANCE 5.1 Filter Media Replacement Typical change-over frequency of the ZC series filters is between 24 months and 36 months, with a number of filters achieving greater longevity depending on inflow characteristics. Refer to Appendix A Technical Data for recommended inspection frequencies for each of the ZC series models. Refer to McBerns installation and maintenance instructions and the relevant material safety data sheets for each ZC series model.