Water quality assessment in seafood processing area of Thuy Hai commune, Thai Thuy district, Thai Binh province

Abstract

Water quality assessment in processing and production areas play an important role in environmental protection. This study was conducted to assess the water environmental status in the seafood processing area of Thuy Hai commune, Thai Thuy district, Thai Binh province. Surface water and wastewater samples were collected at 12 sites in the study area for determination of environmental parameters including pH, DO, BOD5, TSS, PO43-, COD, NH4+ and Coliform. These samples were taken in September and December 2022 and the results showed that the indicators exceeded the regulation limits by QCVN. In 4 wastewater samples (designated as NT1, NT2, NT3, NT4): the values of TSS, COD, BOD5, NH4+, PO43-, Coliform exceeded QCVN 11-MT:2015/BTNMT by 2-4 times. 08 surface water samples (designated as NM1, NM2, NM3, NM4, NM5, NM6, NM7, NM8) have pollutant content values including: COD, BOD5, NH4+, PO43-, Coliform exceeding QCVN 10-MT:2015/BTNMT, QCVN 10:2023/BTNMT (for surface water in seaports) and QCVN 08-MT:2015/BTNMT, QCVN 08:2023/BTNMT (for surface water in canals, ditches, ponds and lakes) in which BOD5 exceeds 12.3 times and COD exceeds 11.6 times. The VN_WQI values indicated poor water quality suitable only for transportation and other equivalent purposes. The results of the survey showed that 47 % of respondents were not satisfied with the current status of surface water quality. It was recorded that most domestic and production wastewater was discharged directly into water collection system in the residential area and then village's concentrated drainage system. The study proposed the need to treat wastewater at production households, build biogas pits, and manholes to settle wastewater before discharging into the general system to improve the efficiency of production management and environmental protection towards sustainable development in the research area.