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Treatment or recycling method and purpose for coal gasification and coal carbonization waste water

A technology of coking wastewater and coal gasification, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem that COD and ammonia nitrogen cannot meet the national discharge standards, and the effluent is difficult to meet Issues such as secondary emission standards and difficulty in meeting emission requirements at the same time achieve the effects of reducing the load of the treatment process, reducing the difficulty of operation, and strong impact resistance

Inactive Publication Date: 2012-02-08
曾明
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to complex composition, coking and coal gasification wastewater also has the characteristics of large changes in water quality, poor biodegradability, and high toxicity.
[0003] In the 1970s, the activated sludge method was mainly used in China to treat coking and coal gasification wastewater. After treatment, only phenol and BOD could meet the national discharge standards; in the 1980s, two-stage biochemical, delayed aeration or enhanced biochemical (such as biological Iron, biological carbon, adding auxin, etc.) and other methods to treat coking and coal gasification wastewater, the removal rate of phenol, thiocyanide, and BOD in the wastewater after treatment is over 90%, reaching the national discharge standard, but COD and Ammonia nitrogen does not meet the national emission standards (Tang Lizhen, 1994)
A 2 The treatment effect of the O process is better than that of the activated sludge method, however, after A 2 The effluent treated by the O process is difficult to meet the secondary discharge standard in the national discharge standard (GB8978-1996), especially for COD and NH 3 -N These two indicators are difficult to meet the discharge requirements at the same time. The first and second standards in GB8978-1996 require effluent COD and NH 3 -N is lower than 100mg / L, 150mg / L and 15mg / L, 25mg / L respectively
The main reason why COD is difficult to meet the standard is that coking and coal gasification wastewater contains a certain amount of refractory organic matter, which is difficult to degrade in the bioreactor and enter the final effluent; due to the high COD in the aerobic reactor, In traditional reactors, heterotrophic bacteria (mainly using organic carbon sources as nutrients) are the dominant strains, which inhibit the growth of nitrifying bacteria. In addition, refractory organic substances with biological toxicity can also Will inhibit the growth of nitrifying bacteria, so the effluent NH 3 -N is also hard to hit

Method used

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  • Treatment or recycling method and purpose for coal gasification and coal carbonization waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Using the above combined process to treat the influent COD and NH after coagulation and sedimentation pretreatment 3-N is about 2865mg / L and 127mg / L respectively, the actual coal gasification wastewater is treated in a small test experiment, the experimental water flow rate is 100mL / h, the effective volume of the anoxic biofilter and the secondary aerobic biofilter reactor The hydraulic retention time of the anoxic biofilter reactor is 20h, and the hydraulic retention time of the secondary aerobic biofilter reactor is 40h. The carrier loading in the reactor is 60%, and the volume of a single carrier is 20mm×20mm×20mm. The density is 0.9g / cm 3 , the water holding capacity is 2500%, the dissolved oxygen concentration in the aerobic reactor is controlled at 4-6mg / L, and sufficient alkalinity is added, the activated sludge of the coking wastewater treatment plant is inoculated in the biofilter reactor, and engineering bacteria are added B350M conducts biological enhancemen...

Embodiment 2

[0027] A coking branch of an iron and steel group produced 10848m of comprehensive wastewater 3 / d(452m 3 / h), using the above combination process to process it. After the comprehensive wastewater is collected in the regulating tank, it is pumped to the oil separation and air flotation process to remove most of the oil and SS in the wastewater. The pretreated wastewater is treated in the anaerobic pool and then enters the anoxic pool and aerobic pool at the back end for further treatment. Treatment, the effluent from the aerobic tank enters the high-efficiency biological aerated filter for advanced treatment and then enters the double-membrane treatment system. The membrane effluent after desalination is reused as process circulating cooling water, and the pre-membrane concentrate is used for blast furnace slag flushing.

[0028] The above combined process is used to treat the comprehensive discharge wastewater of coal coking, and the design water volume is 10848m3 3 / d(452m...

Embodiment 3

[0030] A coking group produced 1680m of comprehensive wastewater 3 / d(70m 3 / h), using the above combination process to process it. After the comprehensive wastewater is collected by the regulating tank, it is pumped to the oil separation and air flotation process to remove most of the oil and SS in the wastewater. The pretreated wastewater is treated by the high-efficiency anaerobic pool and then enters the anoxic pool and the aerobic pool at the back end For treatment, the effluent from the aerobic tank enters the high-efficiency aerated biological filter for advanced treatment and then enters the double-membrane treatment system. The membrane effluent after desalination is reused as process circulating cooling water, and the pre-membrane concentrate is used for coal washing in coal yards or after further treatment Discharge.

[0031] The combined process above is used to treat coal coking comprehensive discharge wastewater, and the design water volume is 1680m 3 / d(70m ...

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Abstract

The invention provides a treatment or recycling method and purpose for coal gasification and coal carbonization waste water. The method employs a combined technology of '' pretreatment + efficient + anoxic / aerobic treatment + efficient aeration biofilter + advanced treatment '' with details seen in a specification. The invention has advantages that efficient anoxic treatment not only eliminates organic pollutants in the waste water to reduce post treatment process load but also enhances waste water biodegradability; the efficient aeration biofilter efficiently gathers microbes growing slow, so as to improve processing effect on difficultly degraded organic matters and ammonia nitrogen in the waste water, guarantee stable operation of the integral combined technology and effectively mitigate process operating difficulty of the subsequent advanced treatment. The invention is suitable for standard reached discharging or recycling and present engineering reconstruction and upgrade of gasification and coal carbonization waste water, as well as standard reached discharging or recycling and present engineering reconstruction and upgrade of similar coal chemical industry waste water and waste water containing high density difficultly degraded organic matter.

Description

technical field [0001] The present invention relates to the field of waste water treatment and reuse, more specifically, it relates to the treatment or reuse of coal gasification and coking waste water and the method and application of existing engineering upgrading and transformation, as well as similar coal chemical industry and refractory organic matter containing high concentration Discharge or reuse wastewater treatment standards and upgrade existing projects. Background technique [0002] Coking wastewater and coal gasification wastewater are refractory biodegradable high-concentration toxic organic wastewater produced in the process of coking and coal gas production. Coking wastewater and coal gasification wastewater mainly contain ammonia nitrogen (NH 3 -N), cyanide, phenolic compounds, polycyclic aromatic compounds, nitrogen, oxygen, sulfur-containing heterocyclic compounds and aliphatic compounds and other pollutants have "three-caused" effects and pose a huge thr...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 徐炜张阳曾明
Owner 曾明
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