Enhanced Nutrient Removal by Extended Aeration Christina Edvardsson MicroSepTec, Inc
Typical Pathways & Conversions of Wastewater Treatment for Traditional Septic Tank with Leach Field and for the EnviroServer Influent 10 6 CFU/100 ml Fecal Coliform 260 TSS 220 CBOD 5 20 Organic-N 30 Ammonia 0 Nitrates Septic Tank: Primary Settling Anaerobic Digestion >10 5 CFU/100 ml Fecal Coliform 40 TSS 140 CBOD 5 19 Organic-N 29 Ammonia 0 Nitrates Leach Field: Filtering Anaerobic Digestion Ammonification Nitrification 10-50 Nitrates Groundwater: Nitrate Contamination Traditional Influent 10 6 CFU/100 ml Fecal Coliform 260 TSS 220 CBOD 5 20 Organic-N 30 Ammonia 0 Nitrates EnviroServer: Primary/Secondary Settling Aerobic Digestion Ammonification Nitrification Denitrification Disinfection <2 CFU/100 ml Fecal Coliform 10 TSS 10 CBOD 5 4 Organic-N 1 Ammonia 2 Nitrates Subsurface Dispersal: No/Minor Reactions Biological Uptake Groundwater: <10 Nitrates EnviroServer
SYSTEM DRAWING High Efficiency Blowers On Board Computer Disinfection Unit Thermal Processor At Ground Level Primary Compartment Sludge Transfer Pump Aeration Diffusers Bio Solid Transfer & Denitrification Pump IAPMO TANK CERTIFICATION FOR: 600 Gallon per day - 1200 Gallon per day - 1500 Gallon per day
THERMAL PROCESSOR
ENVIROSERVER PROCESS REACTIONS First Comp. Second Comp. Third Comp. Forth Comp. CBOD 5 REMOVAL NITRIFICATION Organic Matter+O 2 +Nutrients NH 3 +O 2 +CO 2 +HCO 3 - Microbes Microbes DENITRIFICATION - Organic Matter+NO 3 Microbes New Microbes+N 2 +CO 2 +H 2 O New Microbes+CO 2 +H 2 O New Microbes+NO -- 2 +H + +H 2 O NO -- - 2 +O 2 +CO 2 +HCO 3 Microbes - New Microbes+NO 3
MICROSEPTEC ENVIROSERVER SYSTEM
ONBOARD COMPUTER
INSIDE CONTROLLER
SYSTEM STATUS VIA INTERNET
ENVIROSERVER RESULTS FROM THE FOLLOWING THIRD-PARTY STUDIES University of California Riverside (UCR) Ventura Regional Sanitation District (VRSD) NSF International
ENVIROSERVER 600 TEST FACILITY @ UCR
AVERAGE HOURLY FLOW RATE 250 Flowrate, L/hr 200 150 100 50 0 0:00 4:00 8:00 12:00 16:00 20:00 Time of Day
WASTEWATER FLOW RATE PER PERSON DURING MAY 19 TO JULY 27, 1999 Average 39 gpcd Range 8 to 98 gpcd
HOURLY TKN CONCENTRATIONS FOR A WEEKDAY TKN Concentration, mg/l 60 50 40 30 20 10 Influent Effluent 0 0:00 3:00 6:00 9:00 12:00 15:00 18:00 21:00 Time of Day
CBOD5, 500 450 400 350 300 250 200 150 100 50 0 UCR DAILY COMPOSIT CBOD5 CONCENTRATIONS INFLUENT EFFLUENT 5/21 5/26 5/31 6/5 6/10 6/15 6/20 6/25 6/30 7/5 7/10 7/15 7/20 Date
UCR DAILY AVERAGE TOTAL NITROGEN TKN + NITRATE-N CONCENTRATIONS Total Nitrogen, 120 110 100 90 80 70 INFLUENT 60 50 40 30 20 10 EFFLUENT 0 5/21 5/26 5/31 6/5 6/10 6/15 6/20 6/25 6/30 7/5 7/10 7/15 7/20 7/25 Date
Total and Reactive Phosphorus, as PO4-3 40 35 30 25 20 15 10 5 0 UCR DAILY AVERAGE PHOSPHORUS CONCENTRATIONS TOTAL AND REACTIVE INFLUENT EFFLUENT 5/21 5/26 5/31 6/5 6/10 6/15 6/20 6/25 6/30 7/5 7/10 7/15 7/20 7/25 Date
MEASURED CONCENTRATIONS OF INFLUENT AND EFFLUENT WASTEWATER CONSTITUENTS CBOD5 TSS TKN Nitrate-N Total N Total P Septic Tank Typ. Influent: 210-530 237-600 35-80 <1 35-80 10-27 Typ. Effluent: 140-200 50-90 25-60 <1 25-60 10-30 EnviroServer, UCR Aver. Influent: 212 267 43 1.1 44.1 19 Aver. Effluent: Mean 6 6 7 2.1 9.1 2 Std. Dev. 3 4 4.6 1.5 6.1 0.7 No of Samples 31 31 24 31 24 31 % Removal 97% 98% 79% 89%
ENVIROSERVER SYSTEM (VENTURA STUDY)
ONBOARD COMPUTER (VENTURA STUDY)
VENTURA STUDY DAILY RESULTS Total-N, CBOD5 () 100 800 95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 Influent Total-N CBOD 5 11/20 11/27 12/4 12/11 12/18 12/25 1/1 1/8 1/15 1/22 1/29 2/5 2/12 2/19 2/26 Date 700 600 500 400 300 200 100 0 Influent Flow (GPD)
MEASURED CONCENTRATIONS OF INFLUENT AND EFFLUENT WASTEWATER CONSTITUENTS CBOD5 TSS TKN Nitrate-N Total N Total P Septic Tank Typ. Influent: 210-530 237-600 35-80 <1 35-80 10-27 Typ. Effluent: 140-200 50-90 25-60 <1 25-60 10-30 EnviroServer, Ventura Aver. Influent: 178 225 29.8 0.2 30 3.2 Aver. Effluent: Mean 5 10 5.4 10.3 15.7 3.1 Std. Dev. 2 6 9.7 11.6 11.9 1.5 No of Samples 19 20 20 21 20 20 % Removal 97% 96% 48% N/A
TEST RESULTS FROM NSF TEST UNIT 50 45 40 35 30 25 TSS - Final Effluent CBOD5 - Final Effluent 20 15 10 5 Wash-Day Stress Working- Parent Stress 12-Aug-99 17-Aug-99 22-Aug-99 27-Aug-99 1-Sep-99 6-Sep-99 0 11-Sep-99 16-Sep-99 21-Sep-99 26-Sep-99 1-Oct-99 6-Oct-99 Date Total Suspended Solids / CBOD5,
MEASURED CONCENTRATIONS OF INFLUENT AND EFFLUENT WASTEWATER CONSTITUENTS CBOD5 TSS TKN Nitrate-N Total N Total P Septic Tank Typ. Influent: 210-530 237-600 35-80 <1 35-80 10-27 Typ. Effluent: 140-200 50-90 25-60 <1 25-60 10-30 EnviroServer, NFS Aver. Influent: 156 229 42.2 0.4 42.6 N/A Aver. Effluent: Mean 6 8 2 8.8 10.8 N/A Std. Dev. 9 7 0.3 0.3 0.6 No of Samples 107 104 5 5 5 % Removal 96% 96% 75%
TEST RESULTS FROM GRAB SAMPLING OF SYSTEMS CURRENTLY IN OPERATION Customer Application No. of People Vance 4 bdrm residence Fishburne 4 bdrm residence Ziegler 4 bdrm residence Cooper 6 bdrm residence Navarra Industrial Park Colison 4 bdrm residence Sampling Date BOD5 TSS TKN Nitrate-N Total-N 4 9/27/2000 8 8 3.2 3.6 6.8 2 2/28/2001 <2 3 1.1 3.9 5 4 2/28/2001 3 10 1.9 7.5 9.4 4 4/5/2001 14 <1 0.2 9.4 9.6 74 8/1/2001 3 <10 6.1 9 15.1 N/A 1/12/2001 8 14 2.8 4.9 7.7
CONCLUSIONS On-site treatment systems can efficiently remove nutrients like CBOD 5 & Total-N to less than 10, and Total-P to less than 2 during normal operation Total N & P removals are sensitive to change or upset conditions, but will return to normal after some period
CONCLUSIONS CBOD 5 are less sensitive for changes or upset conditions Normal hourly and daily variations of influent hydraulic and mass-loading rates had little effect on average effluent water quality
CONCLUSIONS Daily Composite Effluent Flows and Concentrations From UCR Study: Average Range Flow 39 8 98 gpcd CBOD 5 5.7 2 14 TSS 5.9 <1 14 Tot-N 9.1 1 13
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