Using Simultaneity To Address Industrial Pretreatment and Allocate Local Limits

摘要

The large and diverse industrial customer base of the Cedar Rapids Water Pollution ControlFacility (CRWPCF) demands a unique approach to allocating local limits, maximizing the abilityof local industry to utilize the resources provided by the CRWPCF while simultaneouslyminimizing risk to plant operations. According to the Iowa Department of Natural Resources(Iowa DNR) Wastewater Facility Design Standards, as the population grows, the ratio of peak toaverage discharges is smaller, as the likelihood of simultaneous discharges by all usersdecreases. Similarly, using industrial discharge data, sampling data from the collection system,and plant data, maximum month and maximum day pollutant limits can be developed that reflectthe variable nature of significant industrial users’ production schedules or operations.Considering simultaneity in developing industrial discharge limits increases flexibility for theCRWPCF to allocate industrial discharge limits without undue impact to the treatment plantwhile preserving a safety factor for peak discharges. This flexibility can ultimately enable themunicipalities to develop capacity allocations that offer future economic developmentopportunities to local industry.