Coupling processing technology for steadily improving biodegradability of coking wastewater

A technology for coking wastewater and treatment process, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. It can solve the problems of low ammonia nitrogen removal efficiency, difficult filler replacement, and heavy biochemical process load, etc. problems, to achieve good adsorption and flocculation effects, reduce operating costs, and improve biodegradability

Inactive Publication Date: 2015-05-13
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common pretreatments such as air stripping, air flotation, and oil separation cannot improve the biodegradability of coking wastewater. Although micro-electrolysis technology can improve biodegradability, the traditional micro-electrolysis packing works better at the initial stage of operation, and after a long period of operation, it will There are problems such as packing compaction and channeling, and the loss of iron filings and carbon-containing substances is serious, resulting in a large amount of sludge and difficult replacement of packing
In addition, the single micro-electrolysis process cannot stably improve the biodegradability of wastewater, which is likely to cause problems such as large load of subsequent biochemical processes, low removal efficiency of COD and ammonia nitrogen, etc.
Due to the particularity of micro-electrolysis technology for water quality, the incoming water requires acidity, and the pH is required to be under neutral conditions when it enters the biochemical system after electrolysis. At this time, it is necessary to add alkaline substances to adjust the pH, resulting in high operating costs and burdens for enterprises. aggravate

Method used

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  • Coupling processing technology for steadily improving biodegradability of coking wastewater
  • Coupling processing technology for steadily improving biodegradability of coking wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 50L of coking waste water from a coking plant for static test. The measured COD, biodegradability B / C and initial pH value are 3750mg / L, 0.18, and 8.0 respectively. 30L of it is adjusted for water quality, and the pH value is adjusted to 2.0 with sulfuric acid. Entering the iron-carbon activated coke reaction tower, the iron-carbon ratio of the iron-carbon activated coke is 5:5, the filling porosity is 0.6, blowing and aerating, the residence time is 30min, and 30% concentration of oxidant H is added dropwise to the effluent 2 o 2 20mL / L for catalytic oxidation for 10min, mixed 20L of untreated coking wastewater with it, stirred homogeneously, adjusted the pH value to 7.0, added dropwise 0.1wt% coagulant PAM, the addition amount was 0.6mg / L, and stood Precipitate, take the supernatant to measure COD, biodegradability B / C are 2810mg / L, 0.51 respectively, COD removal rate is 25.1%.

Embodiment 2

[0030] Take 50L of coking waste water from a coking plant for static test, measure COD, biodegradability B / C and initial pH value are 3500mg / L, 0.17, 7.9 respectively, 40L of which are adjusted for water quality, pH value is adjusted to 3.5 with phosphoric acid, Entering the iron-carbon activated coke reaction tower, the iron-carbon ratio of the iron-carbon activated coke is 7:3, the filling porosity is 0.8, blowing and aerating, the residence time is 60min, and 30% concentration of oxidant H is added dropwise to the effluent 2 o 2 10mL / L for catalytic oxidation for 45min, mixed 10L of untreated coking wastewater with it, stirred homogeneously, adjusted the pH value to 7.5, added dropwise 0.3wt% coagulant PAM, the addition amount was 0.1mg / L, let stand Precipitation, the supernatant was taken to measure COD and biodegradability B / C were 1940mg / L and 0.54 respectively, and the COD removal rate was 44.6%.

Embodiment 3

[0032] Take 50L of coking waste water from a coking plant for static test. The measured COD, biodegradable B / C and initial pH value are 4250mg / L, 0.21, and 7.8 respectively. 40L of it is adjusted for water quality, and the pH value is adjusted to 6.0 with tartaric acid. Enter the iron-carbon activated coke reaction tower, the iron-carbon ratio of the iron-carbon activated coke is 8:2, the filling porosity is 0.9, the blast aeration, the residence time is 60min, the effluent is passed into the ozone 3mg / L prepared by the ozone generator, and the Catalytic oxidation for 10 minutes, mixed with 10L of untreated coking wastewater, stirred homogeneously, and adjusted the pH value to 9.0, added dropwise 0.2wt% coagulant PAM, the addition amount was 0.3mg / L, stood for precipitation, took the The COD and biochemical B / C of the serum were determined to be 2670mg / L and 0.50 respectively, and the COD removal rate was 37.2%.

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Abstract

The invention discloses a coupling processing technology for steadily improving biodegradability of coking wastewater. The coupling processing technology disclosed by the invention comprises the following steps: the quality of water in a primary adjusting pool is adjusted; the water enters an iron carbon active coke reaction tower for realizing a micro electrolysis and active coke adsorbed coupling reaction; after a catalytic oxidation reaction, the obtained water enters a secondary adjusting pool to be mixed with a part of the coking wastewater, and then the quality of the water is adjusted; coagulation, sedimentation and the like are performed. According to the method, the iron carbon active coke subjected to high-temperature sintering and microporous activation is used as a filler, H2O2 / O3 and the like are used as a catalytic oxidizer, so that the biodegradability of the effluent from a system is steadily improved to 0.5 or more. The coupling processing technology for steadily improving the biodegradability of the coking wastewater disclosed by the invention has the advantages that the processing effect is steady, the reliability is high, and the operating cost is low. Besides, the coupling processing technology can be promoted to the field of high-concentration organic wastewater which is difficult to degrade, such as printing and dyeing wastewater, chemical wastewater, pharmaceutical wastewater, and the coupling processing technology effectively solves the problems that the biodegradability of the coking wastewater is poor, a traditional micro electrolysis filler is likely to harden, the yield of sludge is large, and the operating cost is high.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a coupled treatment process for stably improving the biodegradability of coking wastewater. Background technique [0002] Coking wastewater is produced during the recovery of by-products such as tar and benzene in the production process of coal pyrolysis at high temperature to obtain coke and gas. It is a typical difficult-to-treat industrial wastewater with complex components, a large amount of refractory substances, and poor biodegradability ( Generally not more than 0.3), high toxicity and other characteristics. At present, most coking plants in China generally use the ordinary activated sludge method to treat the coking wastewater pretreated by distilling ammonia and removing phenols. The harmful substances such as phenol, cyanide and oil in the treated water are greatly reduced, but the COD and NH 3 The removal rate of -N is not high, and the existence of ref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 田京雷胡志刚刘宏强孙中华陈文黄世平李立业
Owner HEBEI IRON AND STEEL
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