Dynamic Waste Water Modeling for Coal Burning Power Plants

摘要

The recent promulgation of revised Effluent Limitation Guidelines(ELG)for steamelectric power plants requires many utilities to address their current wastewater systems for compliance.The revisions will be put in place as current NPDES permits are renewed.Two of the major requirements found in the ELGs are the prohibition against discharging any ash transport water(fly ash/bottom ash/economizer ash sluice water)and stringent treatment requirements for flue gas desulfurization system liquid discharges.At many stations multiple units send wastewater flows to combined processing systems.Understanding the effects of rerouting or eliminating specific streams is not always intuitive.AECOM has developed sophisticated models that mimic current modes of operation and can be used to simulate modified operations.A water/mass balance model of a station’s existing and proposed wastewater management systems was developed using the multi-purpose probabilistic modeling platform GoldSimTM,developed by GoldSim Technology Group,LLC,and the geochemistry model PHREEQC developed by U.S.Geological Survey(USGS,2013).