High strength wastewater and low permit limits A Maryland dairy needed to meet stringent municipal BOD and TSS wastewater discharge limits. DAF pre- treatment would allow the plant to meet TSS and O&G limits; however, the soluble BOD concentra- tions would still be well beyond what the permit al- lowed. So the plant was faced with installing a two- phase treatment system: pretreatment (e.g., DAF) for TSS and O&G removal followed by aer

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