What is China's level of sewage treatment in the world?

Activated sludge method will produce a large amount of sludge, sludge concentration will generally be anaerobic digestion, methanogenic bacteria will be organic matter into methane, the video of the large egg should be used for digestion, the principle of rural biogas digester, septic tank the same. This step can reduce a large part of the organic matter, followed by centrifugal dehydration, and then transported for further disposal, that is, the topic of concern about the "poop" where. First of all, the sludge disposal rate in China is not high, and about 80% of the sludge is concentrated. Next will enter the sludge digestion is very little, about 60-65% will be directly landfill, without harmless treatment. As in the video, about 10-15% of the sludge will be digested and enter the agricultural use, dig a pit to dry it naturally and then use 3-5%, and incinerate about 2%, which is considered safe disposal. Another 15% or so are stacked and shipped in the open air, which is also disposed at will.

4. Future development direction This year is just one hundred years of activated sludge method, my boss chaired a meeting, many domestic cattle participated, roughly mentioned that the future development direction is to establish a NEW concept "new" sewage treatment plant, that is, Nutrients recovery (mainly phosphorus), Energy generation (Energy, mainly to improve sludge digestibility, Methane production), Water reuse.