For a long period of time, most oil and chemical companies have adopted a decentralized approach to sewage treatment, that is, companies, regardless of their size, must have a set of pollution control facilities. However, with the expansion of the scale of enterprises and the acceleration of urbanization in China, sewage discharges have increased significantly, and pollution control costs have become higher.

In this regard, some cities in Jiangsu, Zhejiang, and Liaoning began to popularize the method of combining decentralized and centralized governance. That is, each company first performs part of the treatment in the factory to make its wastewater meet the requirements of entering the urban drainage network (ie, three levels). Emission Standards) Further processing tasks shall be undertaken by a centralized sewage treatment plant or a municipal sewage treatment plant that accepts both industrial wastewater and domestic sewage. Enterprises may only pay a certain sewage fee according to the total amount of pollutants discharged. .

This approach has improved the effectiveness of sewage treatment in various areas, reduced the cost of governance, and reduced the pressure on enterprises, but there have also been some new conflicts. The first is that some enterprises that separately construct sewage treatment are often exposed by surface workers due to high capital investment and operating costs. Second, some enterprises, mainly small and medium-sized enterprises, are driven by economic interests and do not run pollution control facilities that have already been built. There are still some companies that have poor management practices. Pollution control facilities are often in excess of discharge standards. Third, it is difficult to supervise and manage. Once the law enforcement personnel leave, the company's pollution control facilities will not operate.

The above-mentioned problems can be solved effectively by focusing on centralized management and supplemented by decentralization. That is, the combination of centralized and decentralized methods can be upgraded and quantified, and the threshold for individual enterprises can be raised. If a project with a large investment is set up, an independent wastewater treatment plant can be constructed. Otherwise, it will be treated centrally in the park for supervision and control. Regardless of large and medium-sized enterprises, as long as there are projects for wastewater discharge, the proportion of investing in wastewater treatment facilities should be minimized, and large-scale sewage treatment plants should be developed for comprehensive treatment.

At present, some large-scale sewage treatment enterprises in Jiangxi, Jiangsu, Zhejiang, and Guangdong provinces have started a new round of reorganization, and will realize integrated production and use of wastewater treatment, as well as comprehensive management and recycling of wastewater. The effect of governance is to achieve a win-win situation for enterprises and society.

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