Technology for treating and recovering sewage obtained by crushed coal pressure gasification

Abstract

The invention provides a technology for treating and recovering sewage obtained by crushed coal pressure gasification. The technology comprises the following steps that coal gasification sewage obtained by a crushed coal pressure gasification factory passes through a combined adjustment tank, a dissolved air flotation tank, a hydrolysis acidification tank, a BioDopp biochemical reaction tank, a coagulating sedimentation tank, an ozone oxidation tank, and an aeration biofilter so that most of organic pollutants, ammonia nitrogen, suspended matters, phenols and oil in the sewage are removed and recycle water which can be supplied to a circulating water system can be obtained. The technology has a simple process route, can run stably, and has a low cost of treatment on each ton of sewage. Product water treated by the technology can be supplied to circulating water so that sewage obtained by crushed coal pressure gasification can be fully recovered after being treated by the technology and thus emission reduction is realized.

Description

technical field [0001] The invention relates to a sewage treatment process, in particular to a crushed coal pressurized gasification sewage treatment and reuse process, which belongs to the field of water treatment. Background technique [0002] Throughout the development history of the chemical industry in the past hundred years, every change in the structure of raw materials is always accompanied by a huge change in the chemical industry. In 1984, coal accounted for about 74% of the proven recoverable reserves of fossil fuels in the world, while oil accounted for about 12% and natural gas about 10%. From the perspective of resources, coal will be a potential main chemical raw material. With the depletion of oil and natural gas resources, the coal energy chemical industry will play an important role in the sustainable utilization of energy in China, and it will be an important development direction in the next 20 years. Reliance on imported oil is significant. It can be s...

AI Technical Summary

Problems solved by technology

In the biochemical treatment process, since the main feature of coal gasification wastewater is high content of ammonia nitrogen and suspended solids, the nitrification in the conventional activated sludge process is incomplete, and the denitrification hardly occurs. The removal rate of total nitrogen (TKN) Only between 10% and 30%, so it is difficult to remove ammonia nitrogen in coal gasification wastewater

The traditional biochemical process and its combination process require extremely long process and hydraulic retention time in the treatment of pulverized coal pressurized gasification sewage, requiring huge investment and extremely high operating costs

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