Control Of The Heavy Metal Content Of Municipal Sewage Sludge Composting Of Change - The Greening Of Fertilizer Ok

As the world population increasing quickly and economy growing fast, the problem of environmental pollution has become increasingly worse. In recent years, many municipal sewage treatment plants have been built, which effectively alleviate the pollution of water environment caused by the discharge of municipal sewage and industrial wastewater. At the same time , a large amount of sewage sludge produced during the process of sewage treatment may result in second pollution to the environment. Since there are high quality of nutrition elements such as nitrogen, phosphorus and kalium, the utilization of sewage sludge is become an important topics in nowadays research. However, the heavy metals in sewage sludge are the key factor restricting the utilization of sewage sludge. Many studies have been made to decrease and reduce the poisonous effect of the heavy metals in sewage sludge. Therefore, research on the removal of the heavy metal and the utilization of sewage sludge has a very important significance. The sewage sludge from Guiyang sewage treatment plant was taken and studied. The research aims is to effectively reduce the bioavailability heavy metals and use in gardening and greening.It is shown considers that the effects of different stabilitying to remove the bioavailability heavy metals are different. According to experiments, it is concluded that the sewage sludge in Guiyang treated by FA25 can meet the agricultural standard of the heavy metals.At last, work out application rates of sewage fertilizer...