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Biological treatment system for removing pollutants in flue gas desulfurization wastewater

A technology for biological treatment and desulfurization of wastewater, applied in gaseous effluent wastewater treatment, dehydration/drying/concentrated sludge treatment, water/sewage treatment, etc. The effect of reducing the amount of nitrogen and ammonia nitrogen, reducing equipment investment and operating costs, and resisting system shocks

Active Publication Date: 2020-11-06
张建东
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, compared with my country's desulfurization wastewater quality and discharge standards, the existing "chemical precipitation" process degrades COD by adding sodium hypochlorite cr (including: BOD 5 , TOC) cost is high; and some heavy metals such as: selenium, ammonia nitrogen and sulfate, it is difficult to deal with standards

Method used

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  • Biological treatment system for removing pollutants in flue gas desulfurization wastewater
  • Biological treatment system for removing pollutants in flue gas desulfurization wastewater
  • Biological treatment system for removing pollutants in flue gas desulfurization wastewater

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preparation example Construction

[0106] The preparation method of the porous microbial carrier comprises the following steps:

[0107] S110, weighing: weigh each component according to the formula mass ratio, and set aside;

[0108] S120, put polyether 330, adsorbent, triethylenediamine, water, and additives into the reactor, stir for 10-20min, and mix well; then add MZL type polymer absorbent into the reactor, And add 2,4-toluene diisocyanate and 2,6-toluene diisocyanate under stirring, and stir for 2-5 minutes;

[0109] S130. Evenly coat the inner surface of the foaming mold with a release agent, evenly coat the prefabricated mixture in the mold, close the mold, place it at 40° C. for 24 hours or at room temperature for more than 36 hours, and perform foaming. A porous microbial carrier shaped body;

[0110] S140, put the porous microbial carrier molded body into the reactor, soak and react in 10% sodium carbonate solution for 6-12 hours, then wash to neutral; then soak in 2% acetic acid solution for 6-12...

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Abstract

The invention relates to the field of wastewater treatment, and in particular, relates to a biological treatment system for removing pollutants in flue gas desulfurization wastewater, wherein the system comprises a pretreatment unit, a biological treatment unit, a post-treatment unit and a sludge treatment unit; firstly, the desulfurization wastewater is umped to the pretreatment unit for pretreatment through a high-efficiency flocculation coupling softening process; the pretreated water is pumped to a first-stage facultative / second-stage facultative / anaerobic / aerobic biofilm reactor of the biological treatment unit, selenium, ammonia nitrogen and sulfate in the desulfurization wastewater are removed, COD is degraded, biological produced water is discharged into the post-treatment unit foradsorption and interception, biological treatment residues are removed, and up-to-standard discharge is achieved; slurry generated by the process system is completely collected to the sludge treatment unit for treatment. According to the biological treatment system, on the basis of efficient flocculation pretreatment, selenium, ammonia nitrogen and sulfate in the flue gas desulfurization wastewater can be effectively removed through biological treatment and the COD can be effectively degraded through biological treatment, so that the wastewater is discharged after reaching the standard, and no pollution is caused to the environment.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a biological treatment system for removing pollutants in flue gas desulfurization wastewater. Background technique [0002] Coal-fired power plants that use coal as fuel will produce harmful substances such as sulfur dioxide during the combustion process. The limestone-gypsum wet flue gas desulfurization process is widely used in coal-fired power plants to remove sulfur dioxide and other pollutants in the flue gas. [0003] The limestone-gypsum wet flue gas desulfurization plant produces a large amount of desulfurization wastewater during operation, such as: 2×300MW units, the desulfurization wastewater discharge is generally 2.5-14m 3 / h, average 7.9m 3 / h; 2×600MW units, the discharge of desulfurization wastewater is generally 6-25m 3 / h, average 16m 3 / h; 2×1000MW units, the discharge of desulfurization wastewater is generally 25-30m 3 / h, average 27.5m 3 / h; The water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F11/12C02F11/121C02F103/18
CPCC02F9/00C02F11/12C02F11/121C02F2301/08C02F2103/18C02F5/02C02F5/06C02F3/34C02F3/302C02F3/105C02F1/52C02F1/5281
Inventor 张蛟迪张建东黑祥瑞
Owner 张建东
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