Near zero emission treatment process for flue gas desulfurization waste water

A desulfurization wastewater, near-zero discharge technology, applied in the direction of gaseous effluent wastewater treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of unstable effluent water quality, inability to effectively remove dissolved inorganic salts, etc., to achieve The effect of resource utilization, reduction of turbidity and silting index, and improvement of service life

Inactive Publication Date: 2016-09-07
中国东方电气集团有限公司
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Problems solved by technology

The disadvantage of this process is that the effluent water quality is not stable, and the dissolved inorganic salts (F - , SO 4 2- , C

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  • Near zero emission treatment process for flue gas desulfurization waste water

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with specific embodiment:

[0033] Such as figure 1 As shown, the near-zero discharge treatment process of flue gas desulfurization wastewater, the process flow is as follows:

[0034] The waste water from flue gas desulfurization is collected into the waste water regulating tank for water volume regulation and water quality homogenization to reduce system fluctuations and ensure the normal operation of subsequent equipment. The pH value of weakly acidic desulfurization wastewater is adjusted to 9.0~9.5, and after precipitation, flocculation, clarification and other processes, most of the Mg contained in the wastewater 2+ , heavy metal ions, F - , suspended solids and colloids are removed; the primary effluent is sent to the secondary pretreatment system, according to the concentration of calcium and magnesium ions in the water, according to the relationship of molar ratio 1:1, an appropriate amount ...

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Abstract

The invention discloses a near zero emission treatment process for flue gas desulfurization waste water. Primary pretreatment and secondary pretreatment are adopted in the process to retain tiny suspended matter, small granules and fiber as well as bacteria and other impurities with the diameter larger than membrane pore size in the waste water, turbidity and siltation indexes of produced water are greatly reduced, and the service life of a reverse osmosis membrane is prolonged; a double-membrane method technology including a micro-filtration membrane and a reverse osmosis membrane is combined to recover and treat the desulfurization waste water, effluent quality of the whole desulfurization waste water treatment system can be improved effectively, and the system can operate stably. The problem that effluent quality of the desulfurization waste water is instable can be effectively solved, and the removal rate of soluble inorganic salt (F-,SO42- and Cl-) and the reuse rate of the waste water are increased. Full automatic operation can be achieved, and the near zero emission treatment process is easy and convenient to operate, particularly suitable for treating suspended matter, colloid, heavy meal ions and soluble inorganic salt generated by the desulfurization waste water in coal-fired power plants and capable of achieving resource utilization of the waste water.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a near-zero discharge treatment process for flue gas desulfurization wastewater. Background technique [0002] In the wet limestone washing flue gas desulfurization process, a certain amount of waste water will inevitably be produced. The main characteristics of desulfurization wastewater are: unstable water quality, easy to precipitate; high concentration of suspended solids; supersaturated sulfite (CaSO 3 ), sulfate (CaSO 4 ), heavy metal ions (Hg 2+ 、Cr 6+ 、Cd 2+ , Pb 2+ etc.), containing a large amount of soluble inorganic salts (F - , SO 4 2- , Cl - ). Water quantity and water quality are related to many factors such as desulfurization process system, flue gas composition, ash content and absorbent, among which heavy metal ions and a large amount of dissolved inorganic salts are polluted prominently and are difficult to deal with. [0003] At present, the commo...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/12C02F101/10
CPCY02A20/131C02F9/00C02F1/441C02F1/444C02F1/52C02F1/66C02F2001/425C02F2101/10C02F2101/101C02F2101/12C02F2103/18C02F2301/08
Inventor 李颖茹李晓飞贺靖皓赵芬李沛徐海奔牟岩
Owner 中国东方电气集团有限公司
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