成年人免费在线观看I高清不卡一区二区三区I91热这里只有精品I久久精品看I国产美女视频黄a视频免费I97视频人人免费看I丁香avI国产丝袜高跟

General industrial wastewater solutions

Most industrial wastewater has relatively simple composition, containing only a small amount of organic pollutants, and the treatment process is also relatively simple. Generally, only simple pretreatment (filtration, precipitation, pH adjustment, etc.) and biochemical treatment are needed. Some wastewater contains not only a small amount of organic pollutants but also a small amount of salt, which requires desalination. Generally, evaporation and membrane treatment processes are used, and the effluent can be discharged after biochemical treatment to meet standards or reused.