STATUS OF DISCHARGE PRESSURE AND SURFACE WATER QUALITY AT SOME CANALS IN THUAN AN CITY, BINH DUONG PROVINCE

Abstract

The study aims to evaluate the discharge pressure and surface water quality at four canals in Thuan An city, Binh Duong province. In each monitoring station, the sampling was conducted to analyze the water quality parameters including pH, dissolved oxygen (DO), biological oxygen demand (BOD₅), chemical oxygen demand (COD), total suspended solid (TSS), ammonia nitrogen (N-NH₄⁺), nitrite-nitrogen (N-NO₂^-), nitrate-nitrogen (N-NO₃^-), phosphate (PO₄^3-), coliform and fecal coliform in dry and wet seasons. The results presented the water pollution of two areas at four main streams (Ba Lua canal, Bung canal, canal D and Cat stream) which showed that the water quality value, including pH (5.8±0.3 to 7.8±0.6); DO (2.0±0.1 to 5.1±1.0 mg/L); BOD₅ (7.2±1.4 to 293.1±21.4 mg/L); COD (14.7±3.3 to 686.3±272.3 mg/L); TSS (23.0±2.7 to 198.5±110.2 mg/L); N-NH₄⁺ (0.77±0.51 to 24.02±6.34 mg/L); N-NO₂^- (0.02±0.01 to 0.90±0.93 mg/L); N-NO₃^- (0.07±0.06 to 4.79±3.59 mg/L); PO₄^3- (0.11±0.09 to 3.35±1.58 mg/L); coliform (3.7×10³±8.0×10² to 1.5×10⁷±2.4×10⁴ MPN/100 mL); and fecal coliform (4.0×10²±7.5×10¹ to 5.9×10⁵±1.3×10³ MPN/100 mL). Correlation analysis showed that most of the parameters were related to each other at statistical significance (P<0.05). The results showed that most of water quality parameters varied significantly among the sampling sites and illustrated degradation of canal water quality. In order to restore the stream water quality and prevent its further pollution, critical efforts are the development of the surface water monitoring network and management of polluted stream water.

Keywords: Canal, pollution, residential area, Thuan An, water quality.