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High-ammonia-nitrogen wastewater treatment system and process

A wastewater treatment system, high ammonia nitrogen technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, water pollutants, etc. Problems such as big problems, to achieve good processing results and broad application prospects

Pending Publication Date: 2022-07-29
苏州仕净科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used industrial ammonia nitrogen wastewater treatment methods mainly include steam stripping, ammonia distillation tower treatment, stripping treatment and other technologies. Among the above methods for treating high ammonia nitrogen wastewater, the separated ammonia gas is mostly made of acid (such as sulfuric acid, etc.) The ammonia gas is absorbed to produce high-concentration ammonium sulfate. However, the by-product of this high-concentration ammonium sulfate still needs to be cleaned up and processed, and as environmental protection becomes more and more stringent, there are big problems in the back-end application path; Or use water to absorb ammonia gas to obtain ammonia water. Although the water absorption method is relatively mature, it needs to consume a large amount of fresh water, and can only obtain low-concentration ammonia water (<3%), and it needs to be concentrated to obtain 20% to 30%. The concentrated ammonia water or liquid ammonia still needs a large amount of steam, the recovery rate of ammonia is low, the water consumption is large, the energy consumption of the formed dilute ammonia water is large in the concentration process, and the added value of the recovered ammonia water is low
It can be seen that there are certain limitations in several traditional ammonia nitrogen wastewater treatment technologies at present, and for wastewater with high ammonia nitrogen (ammonia nitrogen concentration > 1000mg / L) and poor biodegradability, there is even a lack of better treatment processes at present, and secondary pollution is common. And the ammonia content in wastewater is difficult to meet the requirements of stricter discharge standards

Method used

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Examples

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Embodiment 1

[0105] The present embodiment provides a process for treating high ammonia nitrogen wastewater, comprising the following steps:

[0106] S1, set the flow to 0.2m 3 / h, high ammonia nitrogen wastewater with ammonia nitrogen concentration of 1000mg / L and pH of 9.7 (nitrate nitrogen concentration is about 0mg / L, COD concentration is about 0mg / L, and total nitrogen concentration is 1000mg / L) to the pH adjustment tank, The pH value of wastewater is adjusted to 10-11 by adding NaOH solution with a mass fraction of 30% into the pH adjustment tank through a flow pump;

[0107] S2. The effluent of the pH adjustment tank is transported to the heat exchanger for heat exchange, and then sprayed from the top into the stripper, and is in countercurrent contact with the gas that enters the stripper from the bottom, so that the ammonia in the waste water is converted from liquid phase to gas phase Then it is discharged from the top of the stripper;

[0108] Among them, the gas flow rate ent...

Embodiment 2

[0133] This embodiment adopts the same adsorbed oxidant as in Embodiment 1, and the differences are mainly listed below.

[0134] A process for treating high ammonia nitrogen wastewater provided by this embodiment includes the following steps:

[0135] S1, set the flow to 0.2m 3 / h, high ammonia nitrogen wastewater with ammonia nitrogen concentration of 4000mg / L and pH of 9.96 (nitrate nitrogen concentration is about 0mg / L, COD concentration is about 0mg / L, and total nitrogen concentration is 4000mg / L) to pH adjustment tank, The pH value of wastewater is adjusted to 10-11 by adding NaOH solution with a mass fraction of 30% into the pH adjustment tank through a flow pump;

[0136] S2. The effluent of the pH adjustment tank is transported to the heat exchanger for heat exchange, and then sprayed from the top into the stripper, and is in countercurrent contact with the gas that enters the stripper from the bottom, so that the ammonia in the waste water is converted from liquid p...

Embodiment 3

[0146] This embodiment adopts the same adsorbed oxidant as in Embodiment 1, and the differences are mainly listed below. The present embodiment provides a process for treating high ammonia nitrogen wastewater, comprising the following steps:

[0147] S1, set the flow to 0.2m 3 / h, high ammonia nitrogen wastewater with ammonia nitrogen concentration of 1000mg / L and pH of 9.7 (nitrate nitrogen concentration is about 0mg / L, COD concentration is about 0mg / L, and total nitrogen concentration is 1000mg / L) to the pH adjustment tank, The pH value of wastewater is adjusted to 10-11 by adding NaOH solution with a mass fraction of 30% into the pH adjustment tank through a flow pump;

[0148] S2. The effluent of the pH adjustment tank is transported to the heat exchanger for heat exchange, and then sprayed from the top into the stripper, and is in countercurrent contact with the gas that enters the stripper from the bottom, so that the ammonia in the waste water is converted from liquid ...

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Abstract

The invention discloses a high ammonia nitrogen wastewater treatment system and process. The system comprises: a pH adjusting tank; the heat exchanger is connected with the pH regulating tank; the stripping tower is connected with the pH regulating tank through a heat exchanger; the adsorption oxidation tower is connected with the stripping tower and is filled with an adsorption oxidant; the cooler is connected with the stripping tower through the heat exchanger; the adjusting tank is connected with the cooler; and the A / O biochemical system is connected with the adjusting tank. According to the invention, ammonia gas separated from the stripping tower can be directly adsorbed and oxidized into nitrogen through an adsorption oxidation material in the adsorption oxidation tower, the adsorption oxidation efficiency can reach 95% or more, gas discharged after treatment of the adsorption oxidation tower enters the stripping tower for reuse, and no waste gas is discharged in the whole process; the ammonia content in discharged water can be reduced to 15 mg / L or below, secondary pollution is avoided, and the method has a wide application prospect in the aspect of high-ammonia-nitrogen wastewater treatment.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a high ammonia nitrogen wastewater treatment system and process. Background technique [0002] The printed circuit board industry, rare earth industry, photovoltaic industry, silicon wafer, and semiconductor industry will produce high-concentration ammonia nitrogen wastewater. Ammonia nitrogen wastewater will lead to eutrophication of water bodies, and it is also one of the main reasons for red tides in my country's seas. Substance control has been strengthened, and discharge standards have become more stringent. According to the I-level standard in the national comprehensive sewage discharge standard (GB8978-96), the ammonia content of the discharged water must meet the requirements of less than 15mg / L. [0003] At present, the commonly used industrial ammonia nitrogen wastewater treatment methods mainly include stripping, ammonia distillation tower treatment, stripp...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F9/14B01D53/86B01D53/58B01D53/02C02F101/16
CPCC02F9/00B01D53/8634B01D53/02C02F2101/16C02F1/66C02F1/04C02F3/30
Inventor 董仕宏吴倩辛丰何文
Owner 苏州仕净科技股份有限公司
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