在线www I 国产精品自产拍高潮在线观看 I 精品国产一区二区三区av片 I 久久精品中文字幕 I 丰乳肥臂 I 永久黄网站色视频免费观看 I 色欲一区 I 囯产棈品久久久久久久久久久久角 I 国产伦精品一区二区三区妓女 I 免费网站在线观看人数在哪动漫 I 中文精品久久久久人妻不卡 I 毛片免费一区二区三区 I 香蕉视频在线播放 I 欧美黄色小说 I 精品麻豆 I 黄在线观看 I 啪啪免费 I 国产精品激情

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.