parameters: chemical oxygen demand (COD), biological oxygen demand (BOD5), total suspended solids(TSS), ammonium nitrogen (NH4-N), nitrate and nitrite nitrogen(NOx-N),
orthophosphate phosphorus (PO4-P). Analysis of sulphate(SO42−), Total Kjeldahl nitrogen (TKN), Escherichia coli and helminth eggs were carried out once a month.