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.