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Method for low-consumption co-treatment of flue gas desulfurization wastewater and ammonia-nitrogen wastewater

A technology for desulfurization wastewater and ammonia nitrogen wastewater, which is applied in gaseous effluent wastewater treatment, biological water/sewage treatment, neutralized water/sewage treatment, etc., and can solve problems such as unsuitable desulfurization wastewater

Active Publication Date: 2018-06-22
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, an external carbon source is required when treating flue gas desulfurization wastewater with poor biochemical properties. Although no external carbon source is required in the process of sulfide oxidation and desulfurization and denitrification, it is not suitable for desulfurization wastewater containing a large amount of sulfate.

Method used

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  • Method for low-consumption co-treatment of flue gas desulfurization wastewater and ammonia-nitrogen wastewater

Examples

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Effect test

Embodiment 1

[0025] A chemical fertilizer factory in Henan uses coal-fired boilers to provide steam during the production process, and correspondingly produces SO 2 Flue gas, after the flue gas is desulfurized by the wet sodium process, it produces a large amount of Na 2 SO 4 The concentration of desulfurization wastewater is about 645mg / L. The ammonia nitrogen wastewater generated during the nitrogen fertilizer production process has an ammonia nitrogen concentration of 160 mg / L. The two kinds of wastewater are confluent to a mixing tank through the sewage pump for stirring and homogenization. After the wastewater is mixed, the NH 4 + -N: SO 4 2- = 1.7:1 (molar ratio). The main process conditions controlled by the mixing tank are: pH 7.5, temperature 30°C. The activated sludge is inoculated in the biological reaction tank, and the activated sludge contains 27% Candidatus Kuenenia , 24% Anammoxo-globus sulfate and 23% of Bacillus benzoevorans population ， Introduce homogeneous...

Embodiment 2

[0027] In a lead-zinc smelting enterprise, during the process of production, a large amount of medium and low concentration SO is produced due to the smelting of non-ferrous metal ores. 2 The exhaust gas, after being desulfurized by the wet sodium process, produces Na 2 SO 4 The desulfurization wastewater has a sulfate concentration of 445 mg / L; in the process of producing ammonium sulfate in its supporting nitrogen fertilizer plant, a large amount of high ammonia nitrogen wastewater is produced, with an ammonia nitrogen concentration of about 130 mg / L. The two kinds of wastewater are confluent to a mixing tank through the sewage pump for stirring and homogenization. After the wastewater is mixed, the NH 4 + : SO 4 2- = 2:1 (molar ratio). The main process conditions controlled by the mixing tank are: pH 8.5, temperature 28°C. Activated sludge is inoculated in the biological reaction tank, and the activated sludge contains 26% Candidatus Kuenenia , 24% Anammoxo-globus ...

Embodiment 3

[0029] A sewage treatment plant that receives sulfur-containing wastewater has a sulfate concentration of about 130mg / L, an ammonia nitrogen concentration of 50mg / L, and NH 4 + : SO 4 2- =2.5:1 (molar ratio). The main process conditions controlled by the reactor are: pH 7.5, temperature 30°C. Activated sludge is inoculated in the biological reaction tank, and the activated sludge contains 24%Candidatus Kuenenia , 21% of Anammoxo-globus sulfate and 20% of Bacillus benzoevorans population ， The simulated wastewater was introduced into the reactor, and after starting the bioreactor, the hydraulic retention time was controlled to be 8h, and the concentration of activated sludge was 8g / L. After water quality monitoring and analysis, the concentration of ammonia nitrogen in the effluent water is 5 mg / L, the concentration of sulfate is 30 mg / L, and the removal rates of ammonia nitrogen and sulfate are 90% and 77%, respectively.

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Abstract

A method for low-consumption co-treatment of flue gas desulfurization wastewater and ammonia-nitrogen wastewater comprises steps as follows: (1) flue gas desulfurization wastewater containing sulfateand ammonia-nitrogen wastewater are guided into a mixing tank to be mixed; (2) the pH and the temperature of mixed wastewater are adjusted in the mixing tank; (3) firstly, a biological reaction tank is inoculated with cultured activated sludge, the mixed wastewater is introduced from the mixing tank, microorganisms in the activated sludge take ammonia nitrogen as an electron donor in the biological reaction tank, sulfate is reduced to elemental sulfur, besides, ammonia nitrogen is oxidized into nitrogen, and synchronous removal of sulfur and nitrogen is realized. The problems that the water quality of the flue gas desulfurization wastewater hardly reaches the standard after treatment with conventional physical and chemical methods, the biodegradability is poor and biological treatment is difficult are solved, and co-treatment of two kinds of wastewater is realized.

Description

technical field [0001] The invention belongs to the field of industrial water pollutant control, and relates to a method for synergistic treatment of two kinds of waste water, in particular to a low-consumption synergistic treatment method for flue gas desulfurization waste water and ammonia nitrogen waste water. Background technique [0002] In recent years, with the "Action Plan for the Prevention and Control of Air Pollution" (referred to as "Ten Measures"), the new "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2011) and special emission limits, "Ambient Air Quality Standards" (GB3095 -2012) and a series of relevant environmental regulations and standards have fully promoted the development of the industrial flue gas desulfurization industry. Wet desulfurization is currently the most widely used flue gas desulfurization technology. It has the advantages of high efficiency and large processing capacity. However, a large amount of wastewater conta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12C02F103/18C02F101/16C02F101/10
CPCC02F1/66C02F3/12C02F2101/101C02F2101/16C02F2103/18Y02W10/10
Inventor 张肖静陈召马云霞马永鹏周月母佰龙袁东丽张楠周佳暖
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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