Treatment process for coal-chemical engineering waste water

Abstract

The invention discloses a treatment process for coal-chemical engineering waste water. The process comprises a pretreatment stage, a main biochemical treatment stage, an advanced treatment stage and a sludge treatment stage for dehydrating the sludge by using a centrifugal dehydrator in sequence, and specifically comprises the following steps of firstly, pretreatment: firstly, enabling phenol ammonia recovery waste water in the coal-chemical engineering waste water to pass through a phenol ammonia recovery waste water regulating tank, introducing other waste water into a comprehensive waste water regulating tank, and enabling the regulated effluent to respectively enter into corresponding sedimentation basins; secondly, main biochemical treatment: enabling the effluent in the first step to sequentially enter into an external circulation anaerobic system, a biological doubling system, an improved A / O system and a secondary sedimentation tank for corresponding biochemical treatment; thirdly, advanced treatment: enabling the effluent in the second step to sequentially enter into a mixed reaction pond, a flocculating settling pool, an advanced oxidation system, an biological aerated filter and a filtering tank for corresponding treatment, finally discharging the effluent to a clean water basin, and performing dehydration treatment on the sludge generated by the above steps. The treatment process disclosed by the invention has the advantages of more thorough biodegradation and excellent purifying effect of the waste water.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a coal chemical wastewater treatment process. Background technique [0002] Coal gasification is one of the effective ways to rationally use coal resources, and it is also an important part of clean coal technology, and its core equipment is the gasifier. At present, the furnace type with high comprehensive efficiency, mature technology, wide application and continuous development should be the first to be promoted, which is customarily called Lurgi furnace. In the waste water produced by crushed coal pressurized gasifier, the main pollutants include unit phenols, polyphenols, ammonia nitrogen, organic nitrogen, fatty acids and other small amounts of benzene, naphthalene, anthracene, thiophene, pyridine and other refractory organic substances , the biodegradability of the wastewater is poor (B / C is less than 0.3), and there are many surface active substa...

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Problems solved by technology

[0003] In the prior art, a combination of multiple treatment processes has been proposed for the waste water of the crushed coal pressurized gasifier, but there are still certain disadvantages

For example, for the biological treatment process in the combined process, the pure aerobic biological process has poor purification effect because the effluent still contains refractory organic matter, while the anoxic-aerobic (A / 0) biological treatment process generally needs to experience NH 4 + →NO 2 － →NO 3 － →NO 2 － →N 2 Although the process can effectively remove nitrogen in wastewater, NO 3 － The formation of N not only prolongs the denitrification reaction process, but also causes waste of energy and additional carbon sources

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