Wastewater Treatment Annual Performance Report 2011

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1 Wastewater Treatment Annual Performance Report 2011 Treatment Process The Rogerson Wastewater Treatment Facility is a Secondary Treatment Facility which utilizes a Conventional Activated Sludge Process to produce a high quality Effluent. lt also has the capability to utilize a Biological Nutrient Removal process to eliminate nutrients (Nitrogen and Phosphorus) from the Effluent. The Facility has a design capacity of 4.5 MGD (million gallons per day) with a peak flow of MGD. Wastewater is received at the Facility via three pipes; 24-inch force main from the downtown area, another 24-inch force main and a 8-inch force main from the north side of town. The make-up of the wastewater is primarily domestic with some light industrial wastewater. The treated wastewater is permitted for discharge into the Pasquotank River. The sludge that is produced is thickened and stabilized with lime to meet Class B requirements as defined by EPA regulations then hauled to a permit area in the county to be land applied. ( il \l Ii \1. l\l ()li\1,\ ll( )\ I ir.rltlr \r.lt'tri\lrrttr'. Rogerson Wastewater'freatment Plant l{t':pott:ihle I rrtitr Rich Olson, City Manager Telephone: ( ()litil(l l)l'l\('tt tti ( ltlilr:,.' Paul Fredette, Director Telephone: \PIi it11111a l'ct'ttt'l* NC00250 I I, NPDES Perrnit 08184, Air Quality l)ermit WQ , Land Application Pernrit Rogerson Wastewater Treatment Facility 450 Knobbs Creek Drive PO Box 347 Efizabeth City, NC Mourice Brothers: ORC/Wastewater Plant Manager Telephone: s

The Facility has a design capacity of 4.5 MGD (million gallons per day) with a peak flow of 11.25 MGD.

2 Treatment Process Performance (Effluent) NOTE: Operating under NPDES Permit NC received 12 October 2008 JANUARY FLOW 2.6',19li..IGD 4.5 MGD CBOD 2.8 me/l 25mslL AMMONIA NITROGEN 1.89 me/l 8.0 mp/l TOTAL SUSPENDED RESIDUE 6.22ms.lL 30 ms/l ENTEROCOCCI 39.8/100 ml 35/100 ml TOTAL RESIDUAL CHLORINE 2.95 usll { I 3 }50.0 ue/l (Compliance) Ph 6.8(MIN-7.5(MAX) NOT <6.8 NOR > 8.5 DO 9.41me/L NOT< 5.0 me/l DMR Non-Compliant: Exceeded the Enterococci Monthly Limit of 35/100 ml. Clarifier #l was out of service for several weeks due to repairs. FEBRUARY FLOW 2.82sMGD 4.5 MGD CBOD 2.7 ms/l 25 me/l AMMONIA NITROGEN 0.23 me/l 8.0 me/l TOTAL SUSPENDED RESIDUE 5.6ms./L 30 ms./l ENTEROCOCCI 3ll100 ml 35/100 ml TOTAL RESIDUAL CHLORINE 2.55 us./l { l3}50.0 uey'l Ph 6.8(MrN)-7.4(MAX) NOT <6.8 NOR>8.5 DO 9.54me/L NOT<5.0 mell- (Compliance) MARCH FLOW 2.48lMGD 4.5 MGD CBOD 2.9 me/l 25 ms./l AMMONIA NITROGEN 0.56 me/l 8.0 me/l TOTAL SUSPENDED RESIDUE 4.'76ms/L 30 me/l ENTEROCOCCI l9l 100 rnl 35/100 ml TOTAL RESIDUAL CHLORINE 0.83 us/l { I 3}50.0 us/l (Compliance) Ph 6.e(MrN)-7.4(MAX) NOT<6.8 NOR > 8.5 DO 9.36melL NOT<5.0 mell- APzuL FLOW 2.612MGD 4.5 MGD CBOD 2.6me/L 12 ms./l AMMONIA NITROGEN 0.08 ms/l 4.0 ms./l TOTAL SUSPENDED RESIDUE 5.09 ms./l 30 me/l ENTEROCOCCI 10.5 /l00ml 35/100 ml TOTAL RESIDUAL CHLORINE 0.75 ue/l l3)50.0 ug/l (Compliance) Ph 6.9(MIN-8.2(MAX) NOT<6.8 NOR > 8.5 DO 8.81 mp/l NOT< 5.0 me/l

41me/L NOT< 5.0 me/l DMR Non-Compliant: Exceeded the Enterococci Monthly Limit of 35/100 ml. Clarifier #l was out of service for several weeks due to repairs. FEBRUARY FLOW 2.82sMGD 4.5 MGD CBOD 2.

3 MAY FLOW MGD 4.5 MGD CBOD 3.6ms./L 12me/L AMMOMA NITROGEN 0.1I mp/l 4.0me/L TOTAL SUSPENDED RESIDUE 7.4 ms./l 30 mdl. ENTEROCOCCI 27.2/100 ml 35/100 ml TOTAL RESIDUAL CHLORINE l.l ue/l { l3}50.0 us/l (Compliance) Ph 7.2(MrN)-7.6(MAX) NOT<6.8 NOR> 8.5 DO 8.39 me/l NOT < 5.0 mdl- JUNE FLOW MGD 4.5 MGD CBOD 1.4 ms/l 12me/L AMMONIA NITROGEN 0.05 mdl, 4.0meJL TOTAL SUSPENDED RESIDUE 4.2melL 30 ms/l ENTEROCOCCI l9l100 ml 35/ 100 ml TOTAL RESIDUAL CHLORINE 0 ue/l { I 3 }50.0 ue/l (Compliance) Ph 7.2(MrN-7.6(MAX) NOT<6.8 NOR> 8.5 DO 7.89 me/l NOT< 5.0 ms/l JULY FLOW MGD 4.5 MGD CBOD l.8ms/l 12ms./L AMMONIA NITROGEN 0.37mslL 4.0me/L TOTAL SUSPENDED RESIDUE 3.68 ms/l 30 me/l ENTEROCOCCI 8.6/100 ml 35/100 ml TOTAL RESIDUAL CHLORINE 3.1ue/L f l3)50.0 ue/l (Comoliance) Ph 7.1(MrN)-7.7(MAX) NOT<6.8 NOR > 8.5 DO 7.56 ms./l NOT <5.0 mp/l AUGUST FLOW MGD 4.5 MGD CBOD 2.7 me/l 12melL AMMONIA NITROGEN 0.22ms./L 4.0 ms./l TOTAL SUSPENDED RESIDUE 6.94 ms/l 30 me/l ENTEROCOCCI 21l100 ml 35/100 ml TOTAL RESIDUAL CHLORINE 6.2ue/L { I 3}50.0 ue/l (Comoliance) Ph 7.2(MIN)-7.7MAX) NOT<6.8 NOR > 8.5 DO 8.98 msll. NOT<S.O me/l

2melL 30 ms/l ENTEROCOCCI l9l100 ml 35/ 100 ml TOTAL RESIDUAL CHLORINE 0 ue/l { I 3 }50.0 ue/l (Compliance) Ph 7.2(MrN-7.6(MAX) NOT<6.8 NOR> 8.5 DO 7.89 me/l NOT< 5.0 ms/l JULY FLOW 1.845 MGD 4.

4 SEPTEMBER FLOW 2.2t3MGD 4.5 MGD CBOD 2.5 mell 12ms./L AMMONIA NITROGEN 0.08 mdl- 4.0 ms./l TOTAL SUSPENDED RESIDUE 2.7 me/l 30 me/l ENTEROCOCCI 12.6/100 ml 35/100 ml TOTAL RESIDUAL CHLORINE 0 us/l { I 3}50.0 us/l (Comoliance) Ph 7.0(MIN-7.6(MAX) NOT<6.8 NOR > 8.5 DO /.)) ms/l NOT< 5.0 me/l OCTOBER FLOW 2.0il MGD 4.5 MGD CBOD 2.7 me/l 12ms./L AMMONIA NITROGEN 0.06 me/l 4.0 me/l TOTAL SUSPENDED RESIDUE 4.73 ms./l 30 me/l ENTEROCOCCI 10.3/100 ml 35/100 ml TOTAL RESIDUAL CHLORINE 3.43 usll { I 3} 50.0 us/l (Compliance) Ph 7.00(MIN)-7.4(MAX) NOT<6.8 NOR > 8.5 DO 8.l9 ms/l NOT <5.0 me/l NOVEMBER FLOW MGD 4.5 MGD CBOD 2.7 ms./l 25 ms.ll AMMONIA NITROGEN 0.17 ms./l 8.0 me/l TOTAL SUSPENDED RESIDUE 7.47 mell 30 me/l ENTEROCOCCI 23/l00ml 35/100 ml TOTAL RESIDUAL CHLORINE 1.37 ue/l { 13}50.0 ug/l (Compliance) Ph 7.1(MrN)-7.7MAX) NOT<6.8 NOR>8.5 DO 8.61 me/l NOT<5.0 me/l DECEMBER FLOW MGD 4.5 MGD CBOD 2.2mell 25 me/l AMMONIA NITROGEN.l5mpr'L 8.0 ms/l TOTAL SUSPENDED RESIDUE 4.2lme/L 30 ms/l ENTEROCOCCI l3ll00ml 35/100 mv month TOTAL RESIDUAL CHLORINE 0.3us/L { l3}50.0 us/l (Compliance) Ph 6.9(MrN)-7.s(MAX) NOT<6.8 NOR >8.5 DO 9.35 ms.tl NOT<5.0 me/l

/L AMMONIA NITROGEN 0.06 me/l 4.0 me/l TOTAL SUSPENDED RESIDUE 4.73 ms./l 30 me/l ENTEROCOCCI 10.3/100 ml 35/100 ml TOTAL RESIDUAL CHLORINE 3.43 usll { I 3} 50.0 us/l (Compliance) Ph 7.00(MIN)-7.

5 1. Notification The 2010 Annual Report was made available to our customers on 10 February 20I2.The following methods were used. o Reports available at following locations: City Hall (City Manager's Offrce and Customer Service) Fleet Maintenance Complex (Pritchard Street) Rogerson Wastewater Treatment Facility 2. Certification I certify under penalty of law that this report is complete and accurate to the best of my knowledge. I fruther certify that this report has been made available to the customers of the City of Elizabeth City and that those customers have been notified of its availabilitv. PauI A. Fredette, PE Paul A. Fredette Utilities Director City of Elizabeth City I Februarv 2OI2 Date

Facility 2. Certification I certify under penalty of law that this report is complete and accurate to the best of my knowledge.

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-o dn. h+-) +r o. zri] ofi F zri] t- 4 a rrl F *l F Fl ca h {-) op{ U c1 t*{ {-) () -o dn rf{ F{ Iq +r o h+-) The Rogerson Wastewater Treatment Facility is a secondary treatment which utilizes a conventional activated sludge process