Desulfurization wastewater anti-scaling pretreatment method and system

A technology for desulfurization wastewater and pretreatment, which is used in gaseous discharge wastewater treatment, water/sewage treatment, heating water/sewage treatment, etc. Blocking, consumption of large chemicals and other problems, to expand the value of use, save consumption, reduce operating costs

Pending Publication Date: 2021-08-17
DATANG ENVIRONMENT IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hardness ion content in the desulfurization wastewater treated by the triple box is very high. If it is not treated, it will cause serious fouling to the subsequent concentration, evaporation and crystallization equipment and pipelines. The existing technology mainly uses lime, soda ash and flocculants, and sodium hydroxide and soda ash There are two technical routes for its softening treatment; however, both routes consume a large amount of chemicals and generate a large amount of sludge, which increases the cost of zero discharge of wastewater and sludge treatment

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  • Desulfurization wastewater anti-scaling pretreatment method and system

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Embodiment 1

[0039] Such as figure 1 As shown, the steps of the desulfurization wastewater anti-scaling pretreatment method of the present embodiment are as follows:

[0040] Transport the desulfurization wastewater from a power plant treated by the "triple box" to the primary reaction pool 1, and the wastewater flow rate is 5t / h; add agent A, namely calcium chloride solution, to the primary reaction pool 1 to control the chlorination The dosing concentration of the calcium solution is 10%, and it is mixed with the concentrated reverse osmosis water 7 returned by the reverse osmosis device 6, and the stirrer 10 is turned on to fully stir evenly to ensure that the actual hydraulic retention time in the primary reaction tank 1 is not less than 5 minutes. The concentration of sulfate radicals in the effluent from the primary reaction tank 1 is controlled to be lower than 500 ppm, and the sludge at the bottom is discharged through the sludge discharge pipe 9 .

[0041] The effluent of the pri...

Embodiment 2

[0047] see figure 1 , the anti-scaling pretreatment system for desulfurization wastewater in this embodiment includes a primary reaction pool 1, a secondary reaction pool 2, a clarifier 3, a filter device 4, and a reverse osmosis device 6 that are sequentially arranged and connected. And the secondary reaction tank 2 is provided with an agitator 10, and the bottom of the primary reaction tank 1, the secondary reaction tank 2 and the clarification tank 3 is provided with a sludge discharge pipe 9, and the reverse osmosis concentrated water outlet of the reverse osmosis device 6 passes through the backflow The pipeline communicates with the primary reaction pool 1.

[0048] The primary reaction tank 1 is mainly used for the reaction between the effluent of the "three-box" and calcium salt to produce calcium sulfate precipitation; in the primary reaction tank 1, the agent A (such as calcium chloride solution) is first added, and the agitator 10 is turned on at the same time for s...

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Abstract

The invention provides a desulfurization wastewater anti-scaling pretreatment method and system. The desulfurization wastewater anti-scaling pretreatment method comprises the following steps: A) conveying effluent of a triple tank to a primary reaction tank, adding calcium salt into the primary reaction tank, and stirring; b) feeding effluent of the primary reaction tank into a secondary reaction tank, adding barium salt into the secondary reaction tank and stirring; c) enabling effluent of the secondary reaction tank to enter a clarification tank, and adding a flocculating agent into the clarification tank for reaction; d) conveying effluent of the clarification tank to a filtering device for filtering; and E) conveying effluent of the filtering device to a reverse osmosis device for reverse osmosis, and enabling at least part of reverse osmosis concentrated water to flow back to the primary reaction tank. According to the method and the system, the desulfurization wastewater can be prevented from scaling in the subsequent concentration process, the operation cost of pretreatment is greatly reduced, the concentration multiple of the desulfurization wastewater is improved, the volume of the wastewater subjected to subsequent crystallization treatment is reduced, and the treatment cost of a wastewater zero discharge system is further reduced.

Description

technical field [0001] The invention relates to the technical field of desulfurization wastewater, in particular to a method and system for anti-scaling pretreatment of desulfurization wastewater. Background technique [0002] The limestone-gypsum wet desulfurization process has many advantages such as high desulfurization efficiency, high operation reliability, wide range of applicable coal types, high absorbent utilization rate, high equipment operation rate, and cheap and easy-to-obtain absorbent. It is currently the most widely used in the world. Extensive and relatively mature sulfur dioxide removal technology. [0003] In order to prevent the concentration of soluble chloride ions and fine dust particles in the slurry from being enriched too high, it is necessary to discharge a certain amount of wastewater from the system to maintain the balance of materials in the desulfurization unit. The impurities contained in desulfurization wastewater are mainly suspended solids...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C02F9/04C02F9/10C02F101/10C02F103/18
CPCC02F9/00C02F2103/18C02F1/441C02F1/001C02F1/58C02F2101/101C02F1/5236C02F1/56C02F1/444C02F2301/043C02F1/04C02F2001/5218C02F2303/16
Inventor荆亚超刘海洋谷小兵李飞杨春平林燕曹书涛夏爽白玉勇
OwnerDATANG ENVIRONMENT IND GRP