Recently, from the Hunan Provincial Ecological Environmental Protection Committee Office, we have learned that the province has promoted the renovation of sewage treatment plants. 109 of the 140 provincial sewage treatment plants have been completed in advance, and the remaining 31 are being vigorously promoted according to the plan.
Since 2017, Hengyang City has strengthened the water pollution control of domestic river basins, increased the construction of sewage facilities in industrial parks, and improved the effect of water quality control. Up to now, all the wastewater from 11 industrial parks above the provincial level have been collected and disposed of. Hengyang Songmu Economic Development Zone is a characteristic industrial base of salt-halogen chemical industry. 89 imported enterprises produce nearly 6,000 tons of wastewater per day. In order to effectively protect water ecological security, large-scale enterprises and 14 heavy metal enterprises in the park have established wastewater pre-treatment. system. In order to ensure the normal operation of the sewage treatment plant, the Songjing Economic Development Zone has invested 10 million yuan this year to build a heavy metal treatment system to conduct on-line intelligent monitoring of heavy metals such as copper, lead, zinc, cadmium and arsenic in the wastewater of the park.