The invention relates to a
coal chemical
wastewater treatment method, in particular to a chemical
wastewater treatment method. The invention aims to solve the problems of the chemical
wastewater treatment method such as bad outlet
water quality and high operational cost. The method comprises the following steps: pretreating
coal chemical wastewater to be treated; then carrying out hydrolytic
acidification treatment, external circulating
anaerobic treatment, anaerobic
sedimentation treatment, adjusting hydrolytic
acidification treatment, contact oxidation treatment,
sedimentation treatment, A / O treatment,
sedimentation treatment,
deamination treatment, coagulating sedimentation treatment and
aeration biological filter tank treatment, wherein the temperature in an external circulating anaerobic tank is controlled within the scope of 32 to 35 DEG C; the hydraulic detention time is 24 to 36 h; the
sludge concentration is controlled between 50 and 100 g / L; the
volume load is 5 to 10 kg COD / m.d ; and the pH value is controlled between 7.0 and 7.5. The invention has the advantages of flexible operation,
impact load resistance, low
operating cost and good
treatment effect; after the
coal chemical wastewater is treated by the treatment method, the outlet
water quality completely can achieve the wastewater comprehensive
discharge standard regulated by the State.