Misunderstanding of sludge disposal

Author: Taida machine       Release time:2016-08-17
Reading guidance:Review of the sludge management policy in our country, state, functional departments and technical communities are lack of responsibilities. For the industry management, technology, design and supervis
     Review of the sludge management policy in our country, state, functional departments and technical communities are lack of responsibilities. For the industry management, technology, design and supervision department in several different historical period doesn't make sludge reduction, stable and harmless treatment as urban sewage and plant construction must link and "heavy water light mud" phenomenon has not changed.
     The amount of sludge generated (according to the water rate of 80% of the total) less than 30 million tons, "1025" sludge treatment and disposal to achieve a total investment of 350 million yuan, central budget funds is not difficult, sludge treatment disposal costs at a relatively reasonable interval. So, until the end of the "Twelfth Five Year Plan" period, is not each province can realize harmless sludge disposal.
     1. Governments ignore sludge problems
There are big differences between government’s concept and real situations. Taking Beijing as an example, In 2008 before the investment of 80 billion yuan added 2.5 million tons of sewage treatment capacity, 2008 has invested 50 million yuan, the investment amounted to $130 billion, but sludge problem has been slow to solve. In government priorities, energy security, homeland security, food security, etc. are priority on environmental safety, how under the suitable conditions, the sludge problems included in the government's view, we need to consider.
     2. Wrong guidance of government in the initial period
In China's sewage treatment development started early, Tianjin Jizhuangzi, Beijing Gaobeidian and Hangzhou Sibao, a large number of large sewage treatment plant using the right technology route. But in next sewage processing ultra conventional development period in, from the end of the last century to the beginning of this century, technology sector was completely negate anaerobic stabilization technique route, the extended aeration (oxidation ditch) with sludge stabilization function or do not have the sludge stabilization function (SBR) process of aerobic sludge stabilization method, at the same time, in under the guidance of the government will landfill as sludge treatment, disposal of a panacea.
     3. Develop and induce wrong technical roads
At the high development process of sludge disposal, China sewage treatment industry made the wrong choice and low load, high investment, technical route of extended aeration process with high energy consumption, can not eliminate the impact so far, is a technology of large errors in the mature period. To the development of sewage treatment, the general office of the Ministry of environmental protection has 2010 issued a paper "on the strengthening of plant pollution prevention and control work the sludge of urban sewage treatment> paper" to the storage of sewage treatment plants (i.e. no treatment) for the purpose of sludge from factory, must be sludge dehydration to moisture content below 50%, which is interpreted as the industry of all the sewage treatment plant, lead horse across the country high dehydration facilities the temporary measures as permanent measures. Under the guidance of the government, in the technology sector as a whole under the situation of aphasia, sludge treatment has been widely used in the technical route of direct high dehydration.
    4. Left-over problem
There are still three left-over problems about sludge disposal: 1. Criteria for the lack of operational performance of the main assessment indicators; 2. No strong supervision;3. No precise technology;
   5. Sludge treatment location
   China's sludge treatment mistakenly taken one step, two or three step, resulting in the sludge market bad money drives out good money phenomenon. The sludge treatment industry in China is facing a major historical choice. First, sludge treatment must have accurate positioning, sludge treatment sewage treatment plant sludge reduction, harmless and stabilization of effective indispensable links. Secondly, to consider energy recovery and recycling technology.
   There are many severe problems for sludge disposal, which also should be reflected by sludge disposal enterprises.
 
  
 
 

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