The difference in unit processes for a traditional on-lot wastewater treatment system compared to the AdvanTex Treatment System

Transcription

1 What you will learn in this lesson IN THIS LESSON, YOU WILL LEARN... The difference in unit processes for a traditional on-lot wastewater treatment system compared to the AdvanTex Treatment System AdvanTex Treatment System components What is nitrification and where does it take place in the AdvanTex Treatment System The optimum conditions for nitrifi cation What is denitrification and where does it take place in the AdvanTex Treatment System UNIT-2-1

2 Unit Processes in a Traditional Septic Tank and Soil Absorption System The septic tank provides primary treatment in the form of grit removal, primary sedimentation, scum retention, and anaerobic digestion. This is followed by the soil dispersal system, which provides aeration and disinfection if the soil and site conditions are acceptable. In many cases, the native soil is incapable of providing adequate treatment and dispersal. In some cases, treatment is required beyond the native soil s capacity. UNIT-2-2

3 Unit Processes With the AdvanTex Treatment System Following the Septic Tank With an AdvanTex Treatment System, the septic tank still provides primary treatment in the form of grit removal, primary sedimentation, scum retention, and anaerobic digestion. The AdvanTex unit or soil substitute provides aeration and treatment to advanced standards. This is then followed by the dispersal system where polishing and disinfection may occur. The AdvanTex Treatment System provides measurable, manageable advanced treatment that some soil and site conditions can not. The active biomat in the AdvanTex Treatment System is accessible so it can be monitored and managed. Other systems bury the biomat where it cannot be monitored or managed. UNIT-2-3

4 The System An AdvanTex Treatment System contains four major components: The 2-compartment processing tank, the AdvanTex AX20N fi lter pod, the pumping and control system, and the recirculating splitter valve. Wastewater fl ows from the home or building into the inlet of the processing tank. It is then pumped out of the second compartment via a Biotube Pump Vault into the AdvanTex pod, where it is further treated and then discharged into the soil dispersal system. The recirculating splitter valve allows a portion of the fi ltrate to return to the processing tank for recirculation. UNIT-2-4

5 The System An AdvanTex RT Treatment System contains four major components: The septic tank, recirculation tank, the AdvanTex fi lter, and the pumping and control system. Wastewater fl ows from the home or building into the inlet of the septic tank. It then fl ows out of the septic tnk through an effl uent fi lter into the recirculation tank, where it is dosed to the AdvanTex fi lter, treated and then discharged into the soil dispersal system. The recirculating return valve allows a portion of the fi ltrate to return to the processing tank for recirculation. Thus allowing a 4:1 recirculation ratio. UNIT-2-5

6 Filter Type AX20N Physical specifications 7.5 x 3 x 2.5 Footprint: 23 sq. ft. Dry weight: 300 lb. The heart of the residential AdvanTex Treatment System is the textile filter pod. This is where the wastewater is biochemically processed and filtered to a high-quality effluent. The AdvanTex Treatment System uses the same naturally-occurring micro-organisms that are found in suitable soil. No special microbes or additives are required. UNIT-2-6

7 AX Series Uses hanging textile sheets Can withstand occasional abnormally high loading conditions Has outstanding serviceability The textile in the hanging sheets has been specifically engineered to provide optimum characteristics for wastewater treatment. Properties include: High porosity High hydraulic conductivity High water-holding capacity These are the same properties desired in an excellent soil for treating wastewater UNIT-2-7

8 AdvanTex Overview - Main Control System Processing Tank Pump Package AdvanTex filter with vent Recirculating splitter vavle Each of these components is discussed in detail on the following pages. UNIT-2-8

9 AdvanTex Overview - #1 Control Panel The control panel sends signals to the pump to deliver liquid from the processing tank to the AdvanTex fi lter pod. Wastewater is applied in small, frequent doses, maintaining aerobic, unsaturated conditions in the textile media. The doses are timed so that the media and attached microbes receive equal doses at equal intervals all through the day. The timers in the panel also control the 4:1 recirculation to dispersal ratio. The control panel includes the necessary required local audio/visual alarms. UNIT-2-9

10 The Control Panel Use a licensed electrician for wiring the following: Make all float connections from the vault to the panel Be sure that incoming power is connected to the panel Connect power from the panel to the recirculation pump Connect power to the discharge pump, if applicable Use a conduit seal outside the riser Note: Do not install the control panel against the house. Use a 4 x 4 post. UNIT-2-10

11 AdvanTex Overview - #2 Processing Tank The processing tank receives raw wastewater from the home, as well as fi ltered effl uent from the AdvanTex media fi lter. Since the AdvanTex Treatment System is a recirculating media fi lter system, the household sewage is diluted in the processing tank as it is blended with treated effl uent. This allows a much higher loading rate onto the media as compared to single-pass systems such as sand beds. UNIT-2-11

12 Two-Compartment Processing Tank There is a minimum 12-square-inch pass-through port in the baffle wall The port center is located at 65 to 75% of the minimum liquid level All tank designs must be structurally sound and watertight All tank designs must be approved by Orenco and authorized by an Orenco Dealer UNIT-2-12

13 AdvanTex Overview - #3 Biotube Pump Package The Biotube pump package includes the vault, the Biotube effl uent fi lter, the high-head pump, the discharge assembly and the fl oat tree with fl oats. The liquid in the processing tank fl ows through the large openings in the vault and through the 1/8-inch mesh of the Biotube effl uent fi lter. The screened effl uent is pumped to the AdvanTex pod using the high-head pump. The Biotube effl uent fi lter prevents particles larger than 1/8-inch from entering the pump. This allows the use of a high-head pump in the AdvanTex Treatment System. The pump is the only moving part in the AdvanTex Treatment System. UNIT-2-13

14 AdvanTex Overview - #3 Biotube Pump Package, continued: The liquid level fl oats signal the control panel that suffi cient liquid is in the processing tank for the pump to operate. Also, there is a high-water alarm fl oat as well as a low-water alarm fl oat. The high-water fl oat signals the control panel to alert the service provider that there is a high water level in the tank. The low water alarm also has the capability of alerting the service provider to turn off the pump to prevent it from running dry. UNIT-2-14

15 Biotube Pump Package Refer to Appendix 3: RSV and Float Level Diagram in the AdvanTex Installation Manual, AdvanTex AX20N Treatment Systems, Document NIM-ATX-AX-1, Orenco Systems, Inc. Verify the float elevations Snap in the float bracket Install the cartridge UNIT-2-15

16 AdvanTex Overview - #4 AdvanTex Filter with Vent The AdvanTex fi lter with vent is a media fi lter made of a textile engineered to have high porosity and high hydraulic conductivity, yet high water-holding capacity. The liquid from the processing tank is pumped to the pressurized distribution system over the textile media surface. As the liquid percolates downward through the media, the microbes attach to the textile and use the wastewater contaminants as a food source. Using oxygen for aerobic respiration, the microbes convert organic carbon to carbon dioxide and water, and ammonium-nitrogen to nitrate-nitrogen. The treated fi ltered water from the AdvanTex media fl ows from the bottom of the fi berglass pod to the recirculation ball valve, where the liquid fl ows back into the processing tank or to the soil dispersal system, IRSIS or surface discharge. UNIT-2-16

17 AdvanTex Overview - #5 Recirculating Splitter Valve The Recirculating Splitter Valve (RSV) allows treated, fi ltered effl uent from the AdvanTex media fi lter to fl ow from the pod back into the processing tank or to the dispersal area. When the ball valve is seated in the RSV, the fi ltered effl uent is directed toward the dispersal system - soil absorption, IRSIS, or discharge. When the ball is unseated, the fi ltered effl uent returns to the processing tank, diluting the incoming septic tank effl uent, and recirculating through the AdvanTex media fi l t e r. The functions of the RSV and the timers combine to maintain the recirculation ratio. The normal recirculation ratio is approximately 4:1. UNIT-2-17

18 RSV Bracket Installation Carefully lower the RSV body into the bracket Push down until it is fully seated UNIT-2-18

19 Flow Path Through an AdvanTex Treatment System Liquid Recirculates through 2nd chamber: Filtrate discharges UNIT-2-19

20 Design: Fully Assembled or Assembled Onsite The AdvanTex Treatment System can be delivered either fully assembled or it can be assembled onsite. A fully assembled package consists of an Orenco fi berglass reinforced plastic tank (FRP) processing tank, AdvanTex AX20N pod, and pumps and controls. The fully assembled package will come with risers attached, fl oats set, RSV set, and the AX20N pod anchored to the top of the tank. If you choose to assemble onsite, you will need to set the fl oats and RSV and install the AX20N pod. UNIT-2-20

21 Why only Orenco FRP or approved concrete tanks Tanks can crush or break if they are not structurally sound Tanks can leak in or out if they are not watertight Poor tank quality can destroy an entire wastewater system Collapsed polyethylene septic tank Collapsed concrete spetic tank with inadequate reinforcing steel UNIT-2-21

22 The Orenco AdvanTex Enable the Treatment System to Reduce Total Nitrogen Nitrogen Removal Requires Two Processes Nitrifi cation - Conversion of Ammonium to Nitrate through a two-step aerobic process in the AdvanTex filter pod. Nitrosomonas Step 1: NH /2O 2 NO H + + H 2 O Step 2: NO /2O 2 NO 3 - Denitrifi cation - Conversion of Nitrate to nitrogen gas through an anaerobic process in the processing tank and the septic tank. Heterotrophic Bacteria NO Organic matter N 2 + CO 2 + OH - + H 2 O UNIT-2-22

23 For Optimum Nitrogen Transformation (Nitrification) to Occur the Following Conditions are Required Adequate alkalinity - Depending upon the influent nitrogen concentration and species 7.14 mg alkalinity as CaCO 3 for every mg NH 4 -N (ammonium-nitrogen) to be nitrified ph of 6 to mg O 2 (molecular oxygen) for every mg NH 4 -N (ammonium-nitrogen) to be nitrified Filtrate DO (dissolved oxygen) concentration of 2.5 to 6 mg/l Infl uent ammonia concentration of 60 mg/l Infl uent TN (total nitrogen) concentration below 65 mg/l Adequate time for nitrifying bacteria to develop Adequate temperature UNIT-2-23

24 Packed Bed Filter Biofilms At the surface and within the top 6+ inches, organic and inorganic matter is trapped and the greatest biofilm accumulation occurs. The top zone is mostly responsible for solids and organic reduction. In this nutrient rich upper zone, most of the organic matter is trapped, decomposed, and digested. Heterotrophic bacteria are primarily responsible for reducing the organic matter concentration. After the carbonaceous demand is met in the upper levels of the media, autotrophic bacteria reduce inorganic constituents (such as ammonium) through nitrification (the conversion of ammonium to nitrate) in the lower region of the media. Filter depth for BOD removal and Nitrification UNIT-2-24

25 Signs of Effective Nitrogen Transformation (Nitrification) Clear, odorless effluent Normal-looking biomat Low CBOD 5 and high clarity DO of 2.5 to 6 mg/l Odorless or odor that is not a nuisance Relatively low ammonium levels (NH 4 -N) Relatively high nitrate levels (NO 3 -N) UNIT-2-25

26 Denitrification requires Nitrogen in the form of Nitrate-N Anoxic conditions to promote anaerobic metabolism Adequate carbon for microbial metabolism By recirculating nitrifi ed fi ltrate to the processing tank, denitrifi cation occurs in the carbon-rich, anaerobic processes within the processing tank environment UNIT-2-26

27 Lesson Summary IN THIS LESSON, YOU LEARNED... The difference in unit processes for traditional on-lot systems compared to the AdvanTex Treatment System AdvanTex Treatment System components What is nitrification and where does it take place in the AdvanTex Treatment System The optimum conditions for nitrifi cation What is denitrification and where does it take place in the AdvanTex Treatment System UNIT-2-27