TOXICITY ASSSEMENT OF INDUSTRIAL WASTEWATER IN AN GIANG PROVINCE BASED ON RESPONSE OF CRUSTACEAN

Abstract

Industrial wastewater samples collected in An Giang province were analyzed for physical-chemical indicators (pH, DO, COD, TSS, chlorine) and assessment of the toxicity (LC₅₀) based on response of crustacean. The results showed that most of the samples met QCVN standards except samples No.1 and No.6, TSS values were 322 mg/L and 334 mg/L higher than the standard. However, the toxicity assessment using rotifer Branchionus calyciflourus showed that most of the effluent samples had an effect on the crustacean organism (LC₅₀) except sample No.1. Especially, wastewater sample No.2 has a very low LC₅₀ value (< 6.25%), although physico-chemical analyses of this sample have reached column A of the QCVN 40:2011/BTNMT.

Keywords: Industrial wastewater, toxicity assessment, chemical oxygen demand, lethal dose, wastewater treatment.