Advanced Treatment Inspection. Aerobic Treatment Units (ATU) Is the pretreatment doing its job? How do they work? Aeration. SIX parts of the system

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1 Is the pretreatment doing its job? Advanced Treatment Inspection ATUs, Treatment filters, Disinfection & Drip Aerobic Treatment Units (ATU) Treatment Pathogens Nutrients Acceptance Sizing BOD/TSS Other How do they work? Saturated environment Aeration Dissolved oxygen (DO) Aerobic Bacteria Eat BOD & Settle out SIX parts of the system Tank Air Mixing Separation Return! Wasting Aeration

2 Dissolved Oxygen [DO] in Clarifier DO Testing Meter Kit Target of 1-2 mg/l in Clarifier Air Dispersion PL Perforated Pipe Fixed Activated Sludge System Porous Stone Diffuser Aerators Aeration System Pressure Check air pressure in the distribution lines

3 Types of Operation Air Pressure Monitoring Increased Pressure: Blockage in Distribution Line Crushed Distribution Line Plugged Diffuser Increased water level in the aeration chamber Air-Tight System Suspended growth Decreased Pressure: Loose fitting in the air distribution system Broken air line Broken diffuser Aerator is not performing Low water level in Aeration chamber Attached (Fixed) growth Suspended growth ATU Suspended growth ATU What should it look like? Sequencing batch reactors USEPA Manual, 1980 Air operating DO > 2 mg/l Brown color- Chocolate Black- Anaerobic Clear- Nothing Musty odor Rotten eggs Settling 50% in 30 min. Effluent quality

4 30 Minute Settleability Test Beaker with 10 even gradations Fill beaker with sample from aeration chamber. Let stand for 30 minutes and read level of clear zone. 20 to 60% is ok. Attached Growth ATU BIOLOGICAL GROWTH (AVERAGE) Fixed film Attached Growth (Fixed film) Air operating DO > 2 mg/l Brown color- Chocolate Black Clear Musty odor Rotten eggs Media Clogging Bridging Effluent quality Attached Growth ATU Rotating Biological Contactor RBC

5 Filter Types Media Filters Design Single pass Recirculating Media Sand Peat Constructed Wetlands Synthetic Filter Checks Other pieces Dosing Media Present Ponding Drainage Saturation Other Pieces Use Septic Tank Effluent screen Dosing Dosing Does the pump operate Pressure Plugging Dosing size Maximum Minimum

6 Pressure Distribution Peat filters- Commercial Lateral access Gravity distribution Media Filter Sand Ponding Ponding is a problem Single pass CWS Media selection Peat Depth Textile Compaction Wetlands Plants Loading rate BOD H2O

7 Constructed Wetland Flow Path in RMF Natural system Seasonal performance BOD/TSS/Fecal N and P Vegetation Recirculating Valve Diagram Media Filter Textile sheets/chips Observation Port To Drainfield From Filter Good Seal Buoyant Ball Basket Textile Filter Sheet Saturation Drainage must operate Aeration/Treatment Pump operation Float depths

8 Finished System Performance Operational All the pieces working Performance evaluation Media Filters Distribution operating Uniform Sound Pressure check Media present No ponding on Media Proper drainage Clear effluent Disinfection Ultraviolet radiation Is the tube available? Is it working? Has it been maintained? Ozone Delivery system Disinfection Chlorination Is the tank in good condition? Is there chlorine? De-Chlorination Is the tank in good condition? Is there? Soil dispersal Loading rates Sizing Treatment Application methods Gravity Biomat? Pressure Drip

9 Drip Distribution System Drip Dispersal Plugging Concerns Outside Roots Soil Inside Particles Growth Drip System Key Points Drip Emitters Pressure Compensating or Non-Pressure Compensating emitters. Controlled flow rate for emitters - Friction used to control flow The operating pressure is typically psi for non-pressure compensating and psi for pressure compensating emitter systems, with water exiting the emitter at 0 psi. Drip Filters Types Screen Disc Sand Remove particles greater than 100 microns Protects emitters from plugging by particles in the effluent Pressure gauge

10 Vacuum Breaker Clean the ball valve component Be careful of scarring ball Make sure air can flow around valve Drip Zone Visual evaluation Uniformity of water distribution Vegetation uniformity Type Color Inspection Flow Filters Clean Present Flushing Air relief Operating Distribution Even Questions?