It has become the development trend of industrial wastewater treatment to recycle wastewater and pollutants as useful resources or to implement closed-circuit circulation. For different types of industrial wastewater, the following principles are generally followed in the treatment:

1. The toxic wastewater which is difficult to be biodegraded should not be discharged into the urban sewer, but should be treated separately.

2. The biodegradable toxic wastewater should be treated first, then discharged into the urban sewer according to the relevant discharge standards, and then further biochemical treatment. Such as wastewater containing phenol and cyanide.

3. Food processing wastewater, sugar making wastewater, papermaking wastewater and other organic wastewater similar to urban sewage can be discharged into the urban sewage system for unified treatment.

4. In order not to increase the load of urban sewers and urban sewage treatment, the wastewater with large flow and light pollution should not be discharged into sewers, but should be treated and recycled properly.

5. Industrial wastewater containing highly toxic substances should be separated from other wastewater for separate treatment and recycling of useful substances, such as wastewater containing some heavy metals, radioactive substances, high concentration phenol, cyanide, etc.

6. Control the generation of waste water from the source of waste water: 1. Adopt reasonable process and relevant equipment as far as possible, and strictly operate and supervise the process of using toxic raw materials and producing toxic intermediate products, so as to eliminate the drip and reduce the loss. 2. In order to eliminate or reduce the generation of toxic and harmful wastewater in the production process, the non-toxic production process should be preferred to replace or reform the backward production process.

Sewage treatment is a continuous work of environmental protection. Due to various factors such as industry, raw materials, equipment, region, temperature and so on, various and complex characteristics of sewage can be caused. Although polyacrylamide can be widely used in different industrial wastewater treatment, Gongyi Filter Industry Co.,Ltd still suggests that water sample detection and small-scale test should be carried out before use, so as to better determine the type of polyacrylamide and the using scheme.