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• <br /> Project Understanding <br /> The City of Elk River is considering to make both liquid and solids stream <br /> improvements to its wastewater treatment facility.The City partnered with <br /> Bolton&Menk to complete the facility planning process for the wastewater <br /> treatment facility and through that process recommendations were developed <br /> for improving the treatment facility. Improvements to the wastewater <br /> treatment facilities are needed to address permit changes in the City's NPDES <br /> discharge permit and also includes planning for additional growth. The City <br /> of Elk River has not yet received the final NPDES permit from the Minnesota <br /> Pollution Control Agency (MPCA),but it is expected that the new permit will <br /> include a phosphorous mass limit of 2,430 kg/year. In addition,the City will <br /> receive a more stringent mercury limit. The new permit along with anticipated <br /> growth will require the City to upgrade the treatment facilities to meet the <br /> additional flows and loadings due to growth and also to meet new permit <br /> limits. <br /> The City of Elk River operates a Class B mechanical treatment facility that <br /> includes pretreatment,primary clarifiers,trickling filters, secondary clarifiers, <br /> sand filtration and UV disinfection. The treated effluent is discharged to the <br /> Mississippi River.The biosolids system consists of a primary and secondary <br /> anaerobic digester with a biosolids storage tank.The biosolids are land applied <br /> to City owned property. <br /> Having completed the facility plan,we have a unique understanding of <br /> the treatment facility and the work that is required at the facility. Bolton <br /> &Menk has met with the treatment staff on multiple occasions to gain a <br /> full understanding of the operation of the treatment facility and also the <br /> improvements that are needed.This understanding provides Bolton&Menk <br /> with unique insight and will allow us to proceed immediately with the <br /> planning of the proposed improvements and preserve the continuity of this <br /> project. <br /> Mechanical wastewater treatment facilities include two separate processes <br /> that are combined to form an integrated treatment system.The processes are <br /> commonly referred to as the "liquid stream" and the "solids stream".The liquid <br /> stream combines various treatment components to convert the wastewater into <br /> natural byproducts of biological stabilization.The capabilities of the liquid <br /> stream is what determines the quality of the effluent produced by the facility. <br /> The solids stream combines treatment components to stabilize,thicken and store <br /> the solids byproducts produced by the liquid stream for eventual incorporation <br /> into the soil. <br /> Wastewater Treatment Facility Improvements I City of Elk River, Minnesota 1 <br />