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| Title | City of Sumner Wastewater Treatment Plant Class II Inspection, April 22-24, 1996 | |||
| Month-Year Published | November 1996 | |||
| Online Availability |
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| Short Description |
A Class II inspection was conducted at the City of Sumner Wastewater Treatment Plant (WWTP) on April 22-24, 1996. The plant was performing marginally during the inspection. The conventional parameters of BOD5 and TSS indicate effective biological and physical treatment. However, effluent BOD5 loading exceeded the permitted monthly average, and percent BOD5 removal was slightly less than the monthly average requirement. Fecal coliform counts were high, exceeding the permitted monthly average, and the effluent chlorine concentration exceeded the daily maximum permit limit. Improvements in regulating chlorine and sulfur dioxide concentrations are recommended. (Also see abstract below) | |||
| Publication Number | 96-350 | |||
| Author(s) | Golding, S. | |||
| Print Availability | ||||
| Number of pages | 17 pp. + app (36 total) | |||
| Keywords | biological, BOD5, copper, effluent, fecal coliform, flow, Inspection, metals, mixing zone, priority pollutant, site investigation, treatment, TSS, waste, wastewater, wastewater treatment plant, water, water quality, zinc | |||
| Subject Waterbodies |
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| Abstract | Long Description |
A Class II inspection was conducted at the City of Sumner Wastewater Treatment Plant (WWTP) on April 22-24, 1996. The plant was performing marginally during the inspection. The conventional parameters of BOD5 and TSS indicate effective biological and physical treatment. However, effluent BOD5 loading exceeded the permitted monthly average, and percent BOD5 removal was slightly less than the monthly average requirement. Fecal coliform counts were high, exceeding the permitted monthly average, and the effluent chlorine concentration exceeded the daily maximum permit limit. Improvements in regulating chlorine and sulfur dioxide concentrations are recommended. An extended period of rainfall during the inspection, with inflow and infiltration problems, caused daily average plant flows to double from the week before the inspection, with negative impacts on plant operation. Nitrification in the plant was effectively reducing effluent NH3. Two priority pollutant metals were detected in the WWTP effluent. Both zinc and copper were found in concentrations that did not exceed water quality criteria at mixing zone boundaries. The copper concentration at the acute mixing zone boundary (4.07 mg/L) was 7% lower than the state acute water quality criterion (4.37mg/L). The aerobically digested sludge did not meet EPA Class A sewage sludge requirements but did meet Class B requirements. |
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