School of Environment, Tsinghua University, Beijing, 100084, China.
School of Environment, Tsinghua University, Beijing, 100084, China.
Environ Pollut. 2022 Nov 1;312:120043. doi: 10.1016/j.envpol.2022.120043. Epub 2022 Aug 28.
Coastal water quality in China has been impacted by direct discharge of industrial wastewater, and various kinds of AOX pollutants have been detected in the seawater and sediment. As the dominant pollution source of Hangzhou Bay, a typical fine chemical industry park "HSEDA" was selected as the study area in this research. The AOX in both wastewater and sludge phases from 22 large-scaled enterprises were simultaneously investigated. The results quantitatively illustrated the AOX flows from engineered wastewater and sludge treatment systems to natural environment. It can be seen that industrial enterprises discharged at least 160 t AOX every year, and about 105.4 t/a AOX eventually entered the natural environment. The dye manufacturing industry, which accounted for more than 60% of the total AOX emission load in HSEDA, was identified as the AOX pollution-intensive sector. The occurrence, characteristic pollutants and fate of AOX in dye wastewater were discussed, on the basis of which the improvements of cleaner production and wastewater treatment technologies have been put forward.
中国沿海地区的水质受到工业废水的直接排放影响，海水中和沉积物中已检测到各种 AOX 污染物。作为杭州湾的主要污染源，本研究选择了一个典型的精细化工园区“HSEDA”作为研究区域。同时调查了 22 家大型企业的废水和污泥相中 AOX 的含量。结果定量说明了 AOX 从工程废水和污泥处理系统向自然环境中的排放量。可以看出，工业企业每年至少排放 160 吨 AOX，约有 105.4 吨 AOX 最终进入自然环境。染料制造业占 HSEDA 总 AOX 排放负荷的 60%以上，被确定为 AOX 污染密集型行业。在讨论了染料废水中 AOX 的存在、特征污染物和归宿的基础上，提出了清洁生产和废水处理技术的改进措施。
