Study of water quality analysis and evaluation of Hengshui Lake

Abstract

The water quality of Hengshui Lake in different regions and at different times was analyzed. According to the data analysis results of chemical oxygen demand (COD), biochemical oxygen demand (BOD5), ammonia nitrogen (NH3-N), total nitrogen (TN), total organic carbon (TOC), total phosphorus (TP), calcium ion content, total hardness, chloride ion content, pH value and conductivity of Hengshui Lake water samples, the water quality of Hengshui Lake was evaluated and analyzed. The results showed that the pollution of Hengshui Lake was mainly organic matter pollution, especially non-biodegradable organic matter pollution. The value of TN was higher than the Class III water, which showed that the self purification capacity of Hengshui Lake water body was weaker. The water quality of Hengshui Lake was better, but the treatment of organic pollution should be paid attention to.

Evaluating Surface Water Quality in a Coastal Province of Vietnamese Mekong Delta Using Water Quality Index and Statistical Methods

“…The concentration of TOC exceeded the allowable threshold of QCVN 08-MT:2015/BTNMT column B1 (4 mg/L) by 1.01-4.13 times. TOC in the current study area was found to be higher than that in the study former [25].…”

“…According to [27], the concentrations of nutrients in water depend a lot on the source directly discharged into the water source, when the nutrient concentration in the water is too high, it could affect the biological balance of the water and pollute the water source. Compared with the study of [25], the concentration of TN and TP in the current study area were much higher. The results revealed that surface water quality in Soc Trang province had a high level of nutrients that easily causes eutrophication.…”