INDUSTRIAL-WASTE SLUDGE MANAGEMENT FOR THE CITY OF ISTANBUL - A CASE-STUDY

Istanbul Water and Sewerage Administration (ISKI) has embarked on a pr ogramme to build twelve sanitary wastewater treatment plants as well a s regulating industrial effluent discharges to sewerage system and imp osing a pretreatment program. An industrial waste sludge management st udy was performed as a part of the sludge management efforts for the C ity of Istanbul. In this study, over 1,500 industries with a wide vari ety of activities in the project planning area have been identified an d categorized considering their proximities to the Publicly Owned Trea tment Works (POTWs). Since there a as little data on industrial sludge , productions were calculated through a three step process which consi sted of wastewater characterization. sludge production identification process typically employed to meet pretreatment standards and developm ent of sludge production formulas. An important part of the study was the classification of industrial sludges as hazardous or non-hazardous . Identifications were made in accordance with the US Code of Federal Regulations and wastewater characteristics and treatment processes wer e evaluated Economic and noneconomic analysis were conducted in order to evaluate the possibility of joint treatment of nonhazardous compati ble sludge with the sanitary sludge. Unit costs for joint treatment at each POTW were calculated and it is found that administrative burdens and liability would be the prime concern as opposed to the economic F actors