真人做人爱试看一

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          Sewage sludge contains persistent organic pollutants; sludge marine dumping is strictly restricted

          Author: Taida machine       Release time:2016-08-17
          Reading guidance:Reading introduction : Ocean dumping is one of the common ways of sludge disposal in developed countries such as Britain and other developed countries. This disposal method is very simple. However, thi
          Reading introduction: Ocean dumping is one of the common ways of sludge disposal in developed countries such as Britain and other developed countries. This disposal method is very simple. However, this kind of disposal method has been forbidden by most of countries. At present, Korea still adopts marine dumping disposal method. It is a kind of materials.
              A great amount of concentrated pollutants is contained in sludge. Sludge is a terminal product of city sewage disposal. Until the third season of 200 years, there are about 3135 sludge treatment plants in our country and total disposal capacity of these sewage disposal plants reach to 0.136 billion t/d. The real disposal capacity is about 0.11 billion t/d. With the popularity of sewage disposal and the increase of processing rate, the production amount of sludge certainly grows greatly. At present, disposal methods mainly consist of dumping, burning, marine dumping and resource utilization. the most common way for resource utilization is stabilization and harmless disposal method which are also main ways used in many countries, such as Luxembourg and Portugal. Over 80% sludge is used for fertilizer making.
              Ocean dumping is one of the most common ways of sludge disposal in Britain and other developed countries. Its operation is simple, but most of the developed countries have banned the dumping disposal method. At present, Korea still adopts marine dumping method to dispose sludge. However, the sludge which will be dumped into ocean must be tested by relevant procedures. After passing tests, ocean dumping disposal methods can be carried out. According to relevant laws in our country, we allow marine sludge dumping. However, owing to a lack of relevant evaluating procedures and standards, we have not carried out marine sludge marine dumping work. In order to potential influence to environment caused by sludge disposal, we need to prevent secondary pollution caused in the process of sludge disposal. Relevant departments should analyze the content of pollutants and variation trend in different sludge disposal plants in different areas.
              Permanent organic pollutants holds carcinogenicity, mutagenesis and distortion effect. The pollutants may lead to diabetes, neonatal defects, male feminization and male-oriented feminine writing. What’s more, most organic pollutants low water soluble compounds, easy to be absorbed by sludge. hard to be bio-graded. Therefore, the disposal of municipal sludge should be carried out carefully in order to prevent organic pollution.
              With the increasing of our population and the improvement of capacity for sludge disposal, the production of sludge mushrooms rapidly. The disposal of municipal sludge will become a key part of our country’s environmental problem. At present, the landfill and pile-up method are main disposal methods in china.
              Marine dumping disposal method is a method which takes advantage of great dilution and accommodate capacity of ocean to dispose sludge. This kind of disposal method has advantages of simple operation and low cost. Therefore, many countries all over the world adopt this method to dispose sludge which is municipal sludge that conforms to relevant evaluation and limits. According to relevant survey, it shows that if marine dumping method is adopted in our countries, great risk will be caused to our ocean environment. Therefore, it is suggested of trying not to use this method. Agricultural use of urban sludge must conform to pollutant discharge standard of urban sewage treatment plant (GB 18918-2012) and urban sewage treatment plant sludge disposal agricultural shale (CJ/T309-2009). In terms of organic pollution, marine dumping disposal method is not suitable for cities in our country. If the oil type in sludge gets effectively degraded, our country can adopt agricultural utilization of sludge for majority of sludge, which is a beneficial disposal method.
           

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          真人做人爱试看一

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