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, y <br /> Effluent Polishing <br /> Introduction <br /> The ultimate disposal/reuse point for treated wastewater at the facility is a <br /> evaporation and subsurface disposal in a drywell field. Plant effluent is held <br /> in an evaporation polishing pond and then pumped to the drywells. <br /> Flow Schematic Description <br /> Secondary effluent flows by gravity into the pond. Effluent is allowed to set <br /> R and algae stabilizes more of the nitrogen. i <br /> Theory of Operation <br /> The polishing pond provides a place for the algae to further stabilize <br /> nutrients that are in the effluent water. Minor solids will settle out before the <br /> water is pumped to the dry wells for disposal and eventual return to the <br /> water cycle. <br /> Pond Operation <br /> The pond operates on its own. Occasional operator care is required to remove <br /> weeds, break up floating algae or small sludge particles. <br /> Pond Maintenance Procedure <br /> Once a month the pond should be inspected and weeds should be removed. <br /> Once each quarter the pond should be inspected for large debris and any <br /> items should be removed. <br /> If you have any questions, contact 7-H Technical Services Group at <br /> 530.271.1600 extension 109 for instructions on replacement. <br /> Pond Maintenance Schedule <br /> Weekly <br /> • Check pond level. <br /> • Clean off any floating algae blooms <br /> Monthly <br /> • Check for and remove weeds <br /> • Check for large debris and remove <br /> 7H Technical Services Group Operation &Maintenance Manual <br /> Effluent Polishing(Pond) Page 17 of 26 <br /> Rev991215 <br />