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Method for treating high-concentration ammonia nitrogen wastewater

A technology of ammonia nitrogen wastewater and treatment method, which is applied in the field of high concentration ammonia nitrogen wastewater treatment, can solve the problems that high ammonia nitrogen wastewater cannot be effectively removed, ammonia nitrogen wastewater has not been further studied, and the proportion of activated sludge is low, so as to reduce excess sludge The effect of high volume, high value-added products, and low sludge disposal costs

Inactive Publication Date: 2019-09-03
见嘉环境科技(苏州)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The Chinese Patent Publication No. CN 101239751 A discloses a treatment method for high-concentration ammonia-nitrogen wastewater, which adopts the intermittent activated sludge method, and enriches and cultivates nitrifying bacteria from the activated sludge by gradually increasing the concentration of ammonia-nitrogen in the culture liquid. It can remove high-concentration ammonia nitrogen (greater than 500mg / L), but the enriched nitrifying bacteria cannot tolerate high-salt environment. For high-salt and high-ammonia nitrogen wastewater, such as leather wastewater, the treatment effect is poor
However, due to the high COD, heterotrophic bacteria form competitive inhibition on autotrophic nitrifying bacteria, the culture period of nitrifying bacteria is long, and the proportion of nitrifying bacteria in activated sludge is low
At the same time, the cultured nitrifying bacteria cannot effectively remove wastewater with high ammonia nitrogen
[0008] "Journal of Environmental Engineering", Volume 4, Issue 3, March 2010, Zhao Kaifeng, Wang Shuying, etc. published "The Effect of NaCl Salinity on the Settling Performance and Nitrogen Removal of Salt-tolerant Activated Sludge" in which the salt-tolerant ability of nitrifying bacteria was tested. Research shows that when the salinity is in the range of 20 g / L, the ammonia nitrogen removal rate can still be maintained above 99%, indicating that the nitrifying bacteria have strong salt tolerance, but the selected ammonia nitrogen concentration is controlled at 65 mg / L Within the range, there is no further research on high-concentration ammonia-nitrogen wastewater

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  • Method for treating high-concentration ammonia nitrogen wastewater

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Embodiment 1

[0032] A treatment method for high-concentration ammonia nitrogen wastewater, comprising the following steps:

[0033] S1. Filtration: pass high-concentration ammonia nitrogen wastewater through a sieve, the sieve is a 100-mesh sieve, to obtain particle-free wastewater, and the ammonia nitrogen value of the wastewater is 20000mg / L;

[0034] S2. Salinization: heat the particle-free wastewater in step S1 to 70°C, add hydrochloric acid at a volume ratio of 1:1.2, the concentration of hydrochloric acid is 40g / L, stir and react at a stirring speed of 500r / min, and drop to room temperature. Precipitate ammonium chloride crystals, filter, and retain the solids, which can be used as agricultural fertilizers, and the filtrate is medium-concentration ammonia nitrogen wastewater;

[0035]S3. Impurity removal: Heat the medium-concentration ammonia nitrogen wastewater in step S2 to 70°C-80°C, add NaOH to adjust the pH to 7.8, produce a large amount of precipitation, filter, the solid is me...

Embodiment 2

[0039] A treatment method for high-concentration ammonia nitrogen wastewater, comprising the following steps:

[0040] S1. Filtration: pass high-concentration ammonia nitrogen wastewater through a sieve, the sieve is 100 mesh or 150 mesh, to obtain particle-free wastewater, the ammonia nitrogen value of the wastewater is 25000mg / L;

[0041] S2. Salinization: heat the particle-free wastewater in step S1 to 80°C, add hydrochloric acid at a volume ratio of 1:1.2, the concentration of hydrochloric acid is 40-50g / L, stir and react, and the stirring speed is 700r / min, down to At room temperature, ammonium chloride crystals are precipitated, filtered, and the solids are retained for use as agricultural fertilizers. The filtrate is medium-concentration ammonia nitrogen wastewater;

[0042] S3. Impurity removal: Heat the medium-concentration ammonia-nitrogen wastewater in step S2 to 80°C, add NaOH to adjust the pH to 8.5, produce a large amount of precipitation, filter, the solid is me...

Embodiment 3

[0046] A treatment method for high-concentration ammonia nitrogen wastewater, comprising the following steps:

[0047] S1. Filtration: pass high-concentration ammonia nitrogen wastewater through a sieve, the sieve is a 150-mesh sieve, to obtain particle-free wastewater, and the ammonia nitrogen value of the wastewater is 22000mg / L;

[0048] S2. Salinization: heat the particle-free wastewater in step S1 to 72°C, add hydrochloric acid at a volume ratio of 1:1.2, the concentration of hydrochloric acid is 42g / L, stir and react at a stirring speed of 550r / min, and drop to room temperature. Precipitate ammonium chloride crystals, filter, and retain the solids, which can be used as agricultural fertilizers, and the filtrate is medium-concentration ammonia nitrogen wastewater;

[0049] S3. Impurity removal: Heat the medium-concentration ammonia nitrogen wastewater in step S2 to 72°C, add NaOH to adjust the pH to 7.8-8.5, produce a large amount of precipitation, filter, the solid is me...

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Abstract

The invention provides a method for treating high-concentration ammonia nitrogen wastewater, wherein the method comprises: S1, filtering; S2, salinization; S3, impurity removing; S4, biological nitrogen removal; and S5, precipitation. According to the present invention, the method of the present invention sequentially comprises salinization with HCl and impurity removing with NaOH, is different from the conventional method firstly performing metal impurity removing with NaOH, can effectively avoid the pollution caused by the NH3 escaping into the air after the NaOH adding, can respectively obtain high-purity NH4Cl and metal hydroxide solids respectively for agrochemical fertilizers and metal refining and purifying, such that the waste caused by the difficulty in the separation after mixingcan be avoided.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a treatment method for high-concentration ammonia nitrogen wastewater. Background technique [0002] Nitrogen pollution is one of the important causes of water eutrophication. Controlling nitrogenous compounds in water plays an important role in maintaining water cleanliness and preventing water eutrophication. It has attracted extensive attention and research in recent years. Nitrogen-containing wastewater discharged from petroleum, chemical and fertilizer industries, such as leather wastewater, has the characteristics of high pollutant concentration, complex composition, and large discharge volume, and it is difficult to meet the discharge standards; especially these wastewaters are mostly characterized by high salt (salt content The amount is greater than 15g / L), resulting in poor biodegradability of sewage, which brings great difficulties to treatment and creates con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C01C1/16C05C3/00C01D3/04C01B25/45C05B7/00C02F101/16
CPCC01B25/451C01C1/164C01D3/04C02F1/001C02F1/5236C02F1/66C02F3/302C02F9/00C02F2101/16C05B7/00C05C3/00
Inventor 张玉龙张玉星沈燕张沐清吕正平徐烨军徐今锐董进成
Owner 见嘉环境科技(苏州)有限公司
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