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Review of the limits in the region show they are quite similar, with BOD at 300 mg/L, TSS at 350 mg/L, TKN at 100 mg/L, TP at 10 mg/L and pH greater than 6 and less than 11.5.
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Limitations for sanitary sewer discharges are set by the municipalities. As a result, many food processors want treatment systems that reduce the loading levels in the plant effluent. These extra fees help recover the additional costs incurred for treating the high organic loading and nutrients contained in the processing plant wastewater. Therefore, many municipalities impose a surcharge fee on food and vegetable processors for the wastewater that is discharged to the sewer system. The high levels measured for BOD 5 and TSS, along with the negative effects from nitrogen and phosphorus through eutrophication, require treatment of the wastewater before it can be discharged into surface water bodies. The parameters affected the most are biological oxygen demand (BOD 5), suspended solids (SS) and TKN and TP levels. The result is wastewater that contains high amounts of organic residues and nutrients. A prime example is the fruit and vegetable industry, where large quantities of water are used to clean and process the fruits and vegetables.
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Food processors in many jurisdictions, including Ontario, experience high sewer disposal fees that include surcharge rates due to the elevated levels of organic loading and nutrients in the plant wastewater.