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Coal chemical industry wastewater pretreatment method with combination of hydrolytic acidification and ammonia-nitrogen desorption

A technology for blowing off coal chemical wastewater and ammonia nitrogen, applied in mining wastewater treatment, biological water/sewage treatment, degassed water/sewage treatment, etc., can solve the problems of high organic nitrogen content and low ammonia nitrogen content, and achieve low treatment cost , good total nitrogen pre-removal, and stable operation

Active Publication Date: 2016-08-31
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

[0007] A coal chemical wastewater pretreatment method combining hydrolytic acidification and ammonia nitrogen stripping, aiming at the problem of high organic nitrogen content of complex molecules and low ammonia nitrogen content in coal chemical wastewater with high concentration of total nitrogen, the coal chemical wastewater is passed through the first-stage ammonia nitrogen After stripping and removing ammonia nitrogen in the raw water, the conversion of complex molecular organic nitrogen to ammonia nitrogen is strengthened through the hydrolysis and acidification unit, and then the second-stage ammonia nitrogen stripping is carried out to achieve enhanced pre-removal of total nitrogen and wastewater biodegradability and carbon-nitrogen ratio (C / N) improvement

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  • Coal chemical industry wastewater pretreatment method with combination of hydrolytic acidification and ammonia-nitrogen desorption
  • Coal chemical industry wastewater pretreatment method with combination of hydrolytic acidification and ammonia-nitrogen desorption
  • Coal chemical industry wastewater pretreatment method with combination of hydrolytic acidification and ammonia-nitrogen desorption

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Embodiment 1

[0032] In this example, a certain coal-gas wastewater in Xinjiang is treated as the treatment object. The COD concentration in the treated wastewater is 17061±1000mg / L, the TN concentration is 6992±100mg / L, the ammonia nitrogen concentration is 3135±100mg / L, the organic nitrogen concentration is 3857±100mg / L, the C / N is 2.44, and the pH value is 8.82.

[0033] (1) One-stage stripping: control the gas-liquid ratio to 1000-1500 and use air as the carrier to blow off. The tail gas after stripping is absorbed by acid and alkali in multiple stages and then discharged. The removal of ammonia nitrogen changed with time, and the results are shown in Table 1.

[0034] Table 1 Ammonia Nitrogen Removal Situation after Primary Stripping

[0035] time (h)

[0036] It can be seen from Table 1 that the gas-liquid ratio of the first-stage stripping control is 1000-1500. After 5 hours of stripping, the concentration of ammonia nitrogen drops to 288±50mg / L, and the removal rate reache...

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Abstract

The invention relates to a coal chemical industry wastewater pretreatment method with the combination of hydrolytic acidification and ammonia-nitrogen desorption. The coal chemical industry wastewater pretreatment method specifically comprises the following steps of 1, first-level ammonia-nitrogen desorption, wherein air is introduced into coal chemical industry wastewater with the high ammonia nitrogen concentration, normal-temperature aeration desorption is performed and stopped till the ammonia nitrogen concentration in the coal chemical industry wastewater is smaller than 300 mg / L; 2, hydrolytic acidification, wherein the coal chemistry wastewater treated after ammonia-nitrogen desorption is subjected to hydrolytic acidification, so that the B / C is improved to 0.3 or more; 3, second-level ammonia-nitrogen desorption, wherein air is introduced into outlet water obtained after hydrolytic acidification again, normal-temperature aeration desorption is performed, and the ammonia-nitrogen concentration generated in wastewater through hydrolytic acidification is decreased, so that the C / N is improved to 4.0-5.0, and the ammonia nitrogen density is smaller than 80-100 mg / L. Compared with the prior art, the coal chemical industry wastewater pretreatment method has the advantages that the wastewater biodegradability can be remarkably improved, the total nitrogen removal rate can reach 60-65%, and the C / N is improved to about 4.0-5.0 so as to reinforce the follow-up biological denitrification effect.

Description

technical field [0001] The invention relates to a wastewater pretreatment method, in particular to a coal chemical wastewater pretreatment method combining hydrolytic acidification and ammonia nitrogen stripping. Background technique [0002] The volume of coal chemical wastewater is as high as several thousand to tens of thousands m 3 / d, the wastewater contains a large amount of solid suspended particles and soluble toxic and harmful compounds, the biodegradability of the wastewater is only about 0.28, there are many kinds of organic pollutants, the chemical composition is very complex, and it contains a large amount of phenols, long-chain alkanes, and aromatic hydrocarbons , Heterocycles, ammonia nitrogen, cyanide and other toxic and harmful substances are typical high-concentration industrial wastewater that is difficult to biodegrade. [0003] The COD value in typical coal chemical wastewater is generally 22000-35000mg / L, the phenol concentration is as high as 4200-750...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/10C02F101/16
CPCC02F1/20C02F3/00C02F9/00C02F2101/16C02F2103/10
Inventor 陈秀荣张玉莹李佳慧周天俊王璐庄有军徐燕
Owner EAST CHINA UNIV OF SCI & TECH
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