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Highly-difficult waste water treatment method

A waste water treatment and waste water technology, applied in natural water body treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of increasing energy consumption and cost of sewage treatment, increasing the processing load of biochemical stations, etc.

Inactive Publication Date: 2017-05-31
青岛万源环境科技有限公司
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Problems solved by technology

However, a large amount of diluted wastewater still contains toxic and harmful substances, and it also increases the processing load of the biochemical station, which virtually increases the energy consumption and cost of sewage treatment.

Method used

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Embodiment Construction

[0017] A method for treating difficult wastewater, comprising the steps of:

[0018] (1) Pretreatment: inject the coal tar processing wastewater into the primary flocculation sedimentation tank through the pipeline mixer, the influent water quality of the coal tar processing wastewater: COD 10000~15000mg / L, volatile phenol 700~1100mg / L, NH 3 -N 100~300mg / L, cyanide 20~50mg / L, chroma 400~600 times, petroleum 200~400mg / L, suspended matter SS 200~400mg / L, pH 8~9, in the primary flocculation sedimentation tank Add 10% organic flocculant in the medium, add 10ml / L to the wastewater and stir, control the hydraulic retention time in the pool for 1-2 hours, the primary flocculation sedimentation first removes the macromolecular organic matter, suspended matter and part of the chroma in the wastewater, The sludge is discharged into the sludge thickening tank, and the SS of the pretreated wastewater is less than 20mg / L, and the chroma is less than 200 times.

[0019] (2) Catalytic oxida...

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Abstract

The invention aims at providing a novel coal tar waste water treatment method. A purely-physicochemical method is adopted to overcome the defects of the prior art and handle results which are difficult in reaching the standard; the method mainly adopts a combined process comprising primary flocculation precipitation, catalytic oxidation and secondary precipitation, thus reducing the chemical oxygen demand (COD) in coal tar waste water as well as an ammonia nitrogen value, a cyanide value and a phenol value of the coal tar waste water, and enabling the effluent quality to reach the first-level sewage discharge standard in China. By adopting the purely-physicochemical method, the waste water treatment method is wider in application scope; by arranging a primary flocculation sedimentation tank, the suspended matters and chrominance of the organic waste water are greatly reduced; most organic and inorganic pollutants, phenol, aromatic hydrocarbons and cyanide in the water are removed by means of a catalytic oxidation two-stage tandem reaction; by adopting the catalytic oxidation reaction which combines a photocatalyst and micro-ozone, the production of a great deal of bubbles is avoided in a catalytic oxidation process; the adoption of ozone activated carbon filler is more conducive to the progress of the reaction and the removal of phenol; furthermore, less ozone is consumed, so that the waste water treatment method has less influence on the environment.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a treatment method for coal tar processing wastewater. Background technique [0002] Coal tar processing and production wastewater includes wastewater generated during gas production and ceramic production. It is characterized by high COD, high phenol, high toxicity, and low B / C ratio. Some also contain cyanide, suspended solids, and chromaticity. High, belongs to high-concentration organic industrial wastewater that is difficult to biochemically treat. At present, the treatment effect of this kind of wastewater in China is poor, and it is difficult for large-scale industrial production. [0003] Most enterprises now mainly use the method of mixing and diluting coal tar wastewater to treat this kind of wastewater, so that the concentration of pollutants in coal tar wastewater has dropped significantly, so that the effluent can reach the first-level disch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/36C02F101/34
Inventor 莫明斋范冰
Owner 青岛万源环境科技有限公司
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