真人做人爱试看一

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          Heavy metals pollution in sludge becomes a focus of society City development needs protect environment

          Author: Taida machine       Release time:2016-08-20
          Reading guidance:There are two main sources: sludge water by precipitation in the high moisture material and sewage treatment process at the bottom of the pollutants in the water and deposited microbial precipitate. Th
             There are two main sources: sludge water by precipitation in the high moisture material and sewage treatment process at the bottom of the pollutants in the water and deposited microbial precipitate. Therefore, sludge can be divided according to the sources of industrial sludge, sludge sludge, tap water plant, sewage treatment plant sludge pipe, rivers and lakes according to the sludge silt. The composition can be divided into hydrophilic and hydrophobic organic sludge sludge, sludge and sludge. The sludge inorganic composition of the ordinary water is relatively simple, the harm to the environment is relatively small. And the sewage treatment plant sludge source for more, composition is relatively complex, so the risk of environmental pollution is large, must be careful on sludge treatment of sludge from sewage treatment plants including raw sludge, sludge aerobic digestion, anaerobic digestion sludge, activated sludge and so on.
              According to relevant statistics, China's sewage treatment plant in the actual sewage treatment about 21 billion T. sewage treatment plant in China city using activated sludge method as the main method of sewage treatment, the use of this method is the biggest drawbacks of each processing 10 thousand tons of sewage will produce about 4 T ~ 5 t wet sludge (water content to 80% it can be folded). The results that the sludge of sewage treatment plants in China. The annual output of about 9 million tons of sludge treatment technology mainly includes: the current sludge pretreatment technology, resource processing technology, processing technology three categories. Sludge pretreatment technology is mainly to reduce the body for the purpose of product concentration and dehydration, with stable chemical properties reduce the quality, stability and disinfection purposes, to improve the dehydration properties for the purpose of regulating three kinds. Sludge processing technology is mainly compost or fermentation, and incineration can reduce the volume of electricity, fuel . sludge disposal method is mainly agricultural use, sanitary landfill, building materials, road construction and so on.
              In our country, refers to the field of prevention and control of heavy metal pollution into the planning of heavy metal pollution in the country has experienced in recent years in Fujian Zijin mining, Yunnan Qujing chromium slag, Guangxi Longjiang pollution of cadmium and other heavy metals pollution incident, the society to pay close attention to the environmental protection department will set off heavy metal pollution control storm, the next five years allegedly countries invested 750 million yuan, also to the effectiveness of prevention and treatment of government leadership assessment content. Countries in 2015 before the establishment of a more perfect system, emergency system, risk assessment system. Environmental pollution of heavy metals mainly refers to the biological toxicities of Hg, CD, Pb, Cr as the agricultural use of sludge key control pollutants including: Zn, Cu, Ni, Hg, CD, Pb, Cr and As.
             At present, the majority of city development in China is at a critical moment a, to seize the national resource-based economy comprehensive reform pilot area construction opportunities, environmental problems can be resolved, will be very important. In the restricting factors of heavy metal pollution prevention and control work, in addition to outside enterprises the prevention and control of heavy metals, heavy metals in sewage sludge treatment is an important part. Zhengzhou Taida energy saving drying equipment limited company of science and technology closely follow the national policy, in cooperation with domestic well-known colleges and Universities - Zhejiang University, developed a SCDD sludge treatment process, by industry experts and the demand of the client value, the company gradually developed into a professional enterprise specialized in sludge treatment, and the gradual development and growth.
             
           

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          Zhengzhou Taida Group    Address:NO. 198,longding industrial zone,high-tech development zone,zhengzhou city,china    Sitemap

          真人做人爱试看一

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