Coal chemical industry wastewater treating method

A technology for coal chemical wastewater and treatment methods, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of poor effluent quality and high operating costs, and achieve strong adaptability , low operating cost and flexible operation

Inactive Publication Date: 2009-08-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a coal chemical wastewater treatment method to solve the problems of poor effluent quality and high operating costs in the existing coal chemical wastewater treatment process

Method used

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  • Coal chemical industry wastewater treating method

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specific Embodiment approach 1

[0019] Specific implementation mode one: combine figure 1 Describe this embodiment, a kind of coal chemical industry wastewater treatment method of this embodiment is realized in this way:

[0020] 1. Hydrolysis and acidification treatment: first, the coal chemical wastewater to be treated is pretreated by phenol ammonia extraction, so that the CODcr concentration of the coal chemical wastewater pretreated by phenol ammonia extraction is controlled between 2000mg / L and 4000mg / L, and the total phenol concentration Control between 400mg / L~800mg / L, unit phenol concentration between 150mg / L~250mg / L, NH 3-N concentration is controlled between 100mg / L~250mg / L, petroleum hydrocarbon concentration is controlled between 50mg / L~150mg / L, and then accounts for 30%~50% of the total volume of the pretreated coal chemical wastewater The coal chemical wastewater flows into the hydrolysis acidification tank for hydrolysis acidification treatment. The sludge concentration in the hydrolysis aci...

specific Embodiment approach 2

[0038] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in step one of this embodiment, the CODcr concentration of the coal chemical industry wastewater after phenol ammonia extraction pretreatment is 3000mg / L, and the total phenol concentration is 600mg / L, unit phenol concentration is 200mg / L, NH 3 -N concentration is 200mg / L, petroleum hydrocarbon concentration is 100mg / L, then the coal chemical industry wastewater accounting for 40% of the total volume of the pretreated coal chemical industry wastewater flows into the hydrolysis acidification tank for hydrolysis acidification treatment, the hydrolysis acidification tank The sludge concentration inside is 1500mg / L, the hydrolytic acidification treatment temperature is 35°C, the hydraulic retention time is 18h, and the volume load is 20kgCOD / m 3 d. The pH value is 6.0. With this treatment process, the COD removal rate is 10%, and the total phenol removal rate is 8%.

specific Embodiment approach 3

[0039] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step two of this embodiment, the FeCl 2 4H 2 The dosage of O is 4.0mg·L -1 d -1 (where d: means day), the CoCl 2 ·6H 2 The dosage of O is 0.4mg·L -1 d -1 (where d: means day), the NiCl 2 ·6H 2 The dosage of O is 0.8mg·L -1 d -1 (where d: indicates day), the temperature in the external circulation anaerobic tank is 34°C, the hydraulic retention time is 30h, the sludge concentration is 80g / L, and the volume load is 7kgCOD / m 3 d. The pH value is 7.3. With this treatment process, the COD removal rate is 60%, and the total phenol removal rate is 50%.

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Abstract

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.

Description

technical field [0001] The invention relates to a method for treating chemical wastewater, belonging to the field of industrial wastewater treatment. Background technique [0002] Coal chemical industry refers to the process of converting coal into gas, liquefied and solid fuels and chemicals through chemical processing using coal as raw material, including high-temperature dry distillation, low-temperature dry distillation, gasification, liquefaction, coal-to-chemicals and other coal processing products. The wastewater discharged by coal chemical enterprises is produced during the coal processing process, including coking wastewater, gasification wastewater, and liquefaction wastewater, mainly high-concentration coal gas washing wastewater. The wastewater is characterized by complex water quality, containing a large amount of phenols, polycyclic aromatic compounds and heterocyclic compounds containing nitrogen, oxygen and sulfur, as well as toxic and harmful substances suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30C02F101/30C02F101/16
Inventor 韩洪军王伟李慧强方芳杜彦杰
Owner HARBIN INST OF TECH
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