Pretreatment method of two-stage enhanced coagulation deoiling for coal chemical industry wastewater

A technology for coal chemical wastewater and pretreatment, applied in mining wastewater treatment, water/sewage multi-stage treatment, water/sewage treatment and other directions, can solve the problems of complex operation, material blockage, easy entrainment and escape, etc., and achieves a clear process principle. Reasonable, low processing cost and stable operation

CN105923830AActive Publication Date: 2016-09-07EAST CHINA UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-09-07

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Abstract

The invention relates to a pretreatment method of two-stage enhanced coagulation deoiling for coal chemical industry wastewater, comprising the specific steps: (1), first-stage coagulation and bouncing treatment: introducing effluent of an oil separation tank into a first-stage coagulating tank, adding an inorganic polymeric coagulant into the first-stage coagulating tank to form small coagulations, adding an organic polymeric coagulant to enlarge the coagulations, and charging the effluent of the first-stage coagulating tank into a bouncing tank for oil-water separation; (2), second-stage coagulation and gas floatation treatment: introducing effluent of the bouncing tank into a second-stage coagulating tank, adding an inorganic polymeric coagulant and an organic polymeric coagulant successively into the second-stage coagulating tank, charging effluent of the second-stage coagulating tank into a gas flotation tank, and carrying out second-stage enhanced coagulation deoiling treatment by means of gas flotation in the gas flotation tank so that the effluent of the gas flotation tank is lower than 80-100 mg / L and adapts to subsequent biochemical treatment. Compared with the prior art, the method has the advantages such as good deoiling effect, good operation stability and low treatment cost.
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Description

technical field

[0001] The invention relates to a sewage pretreatment method, in particular to a two-stage enhanced coagulation and oil removal pretreatment method for coal chemical wastewater. Background technique

[0002] my country's fresh water resources are poor, and the per capita share is only 1 / 4 of the world average, and the distribution is uneven, especially the reverse distribution of water resources and coal resources. Currently, water resources have become the primary factor affecting the development of my country's coal chemical industry. However, when my country introduces and develops the core technology of coal chemical industry, it often fails to introduce and develop coal chemical wastewater treatment technology in time, and its supporting wastewater treatment technology is backward.

[0003] Coal chemical industry wastewater is a kind of high-concentration organic wastewater with extremely complex pollutant components and many refractory substances. It co...

Examples

Embodiment

[0039] In this example, a certain coal-gas wastewater in Xinjiang is treated as the treatment object. The COD concentration in the treated wastewater is 17061mg / L, the TN concentration is 6992mg / L, the ammonia nitrogen concentration is 3135mg / L, the total oil concentration is 1496mg / L, and the pH value is 8.82. After gravity degreasing, the total oil concentration in the effluent water of the grease trap is 1284mg / L, and the total oil removal rate is 14.2%.

[0040] (1) Introduce the effluent from the grease trap into the first-level coagulation tank, and add inorganic polymer coagulant to the first-level coagulation tank to form small flocs, then add organic polymer flocculants to make the flocs larger , the effluent from the primary coagulation tank flows into the floating sink tank for oil and water separation;

[0041] A. Examine the removal of COD and total oil by using polyaluminum chloride and polyferric chloride as coagulants under different dosage conditions. The res...