Toxicity evaluation of MSW leachate usingOncorhynchus mykissandGambusia affinisacute toxicity tests in Kermanshah, western Iran

Abstract

Various physical, chemical and biological characteristics of Kermanshah municipal solid-waste leachate including COD, BOD, EC, pH, T, TSS, TDS, NO 3 --N and PO 4 -3 -P were determined. Laboratory analysis revealed that samples collected in November-January when precipitation is on its peak are highly polluted with very high TSS (9398.8 mg L -1 ), BOD (2630 mg L -1 ) and COD (6240 mg L -1 ), NO 3 --N (4100 mg L -1 ), PO 4 -3 -P (62.4 mg L -1 ). The toxicity of leachate produced at the Kermanshah municipal solid waste dump was determined using the 96-h acute toxicity test with Oncorhynchus mykiss and Gambusia Affinis. Result of toxicity assay indicates that the leachates were highly toxic to Oncorhynchus mykiss (LC50=6.07% v/v) and Gambusia affinis (LC50=12.41% v/v).