6533b854fe1ef96bd12ae8bc

RESEARCH PRODUCT

SCREENING OF CHEMICAL SPILL RISKS TO MUNICIPAL SEWAGE TREA TMENT PLANTS

E. RossiM. Ettala

subject

EngineeringEnvironmental EngineeringWaste managementbusiness.industryMunicipal sewageContaminationField surveyActivated sludgeScreening methodSewage treatmentNitrificationAerationbusinessWater Science and Technology

description

Seven operational mishaps were specified on the basis of a questionnaire on wastewater treatment plants, some of them large. In this study a process was developed for screening the chemical spill risks to municipal biological sewage treatment plant. Data on wastewater treatment processes, potential spill sources and chemical properties were combined to determine the threshold chemical quantities which may inhibit the removal of carbonaceous material, prevent nitrification and methanogenesis, cause sludge contamination or lead to the aeration capacity being exceeded. Two sewage treatment plants and eleven industrial sites were chosen for field studies. The influence of spill duration and maintenance activities on threshold quantities are discussed. A field survey lasting 1-2 hours at each site was long enough for the most relevant data to be obtained when the screening method developed was applied. Several chemical spill risks to the plants studied were specified. In addition, cases were identified in which failure of the pretreatment facilities for industrial wastewaters could cause severe mishaps at a biological wastewater treatment plant.

yearjournalcountryeditionlanguage
1994-08-01Water Science and Technology
https://doi.org/10.2166/wst.1994.0150