Multistage fluidized bed crystallization based desulfuration wastewater treatment method and system

A desulfurization wastewater and treatment system technology, applied in the direction of water/sewage multi-stage treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of waste of resources, slow system feedback, difficult operability, etc., and achieve automatic control The effect of increasing the degree, improving the separation effect and improving the stability

Active Publication Date: 2017-03-22
SHENGFA ENVIRONMENT PROTECTION TECH XIAMEN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But there are the following disadvantages: (1) the existing pretreatment construction cost is high, and the methods such as flocculation and sedimentation require a large area, and a large-scale sedimentation and flocculation system requires a large motor, and the operability during operation is relatively poor. Difficult, the equipment is prone to major failures, resulting in long-term downtime for refurbishment, affecting the continuous operation of the system
(2) The dosage control of the existing pretreatment system is relatively coarse, the degree of automation is low, the feedback of water quality and quantity changes to the system is relatively slow, and the timely adjustment of the process is relatively lagging
(3) The original pretreatment system has a heavy burden on sludge disposal, and a large amount of sludge is hazardous solid waste, which cannot be used effectively, which not only causes waste of resources, but also causes a burden on the natural environment

Method used

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  • Multistage fluidized bed crystallization based desulfuration wastewater treatment method and system
  • Multistage fluidized bed crystallization based desulfuration wastewater treatment method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The desulfurization wastewater was carried out in several multi-stage fluidized bed operating conditions to obtain the following results:

[0057] 1. The pressure of the sludge pump in the filter press system 1 is 0.8MPa, the pressure of the squeeze pump is 1.0MPa, and the water content of the suspended matter sludge is reduced to below 30%; the filtrate passes through the carrier circulating fluidized bed, and passes through the heavy metal adsorbent and the porous channel The adsorption and collision of the carrier can reduce the desorption of heavy metals, and increase the effective contact time through circulating fluidization. The average removal rate of heavy metals in various desulfurization wastewater can reach more than 98%, and the minimum removal rate can reach 96%. Set the crystal seed The seed crystal dosing ratio of the fluidized bed is 1:5000, that is, 1 kg of seed crystals with a particle size of <2mm is added per ton of water to be treated, and the fluid...

Embodiment 2

[0062] The desulfurization wastewater was operated in several multi-stage fluidized bed setting conditions, and the following results were obtained:

[0063]1. The pressure of the sludge pump in the filter press system 1 is 0.4MPa, the pressure of the squeeze pump is 0.8MPa, and the water content of the suspended matter sludge is reduced to 45%; the filtrate passes through the carrier circulating fluidized bed, and passes through the heavy metal adsorbent and the porous carrier The adsorption and collision effects of heavy metals can reduce the desorption of heavy metals, and increase the effective contact time through circulating fluidization. The average removal rate of heavy metals in various desulfurization wastewater can reach more than 96%, and the minimum removal rate can reach 92%. Set the seed flow The seed crystal dosing ratio of the fluidized bed is 1:1000, that is, 3 kg of seed crystals with a particle size of <2mm are added per ton of water to be treated, and the f...

Embodiment 3

[0068] The desulfurization wastewater was operated in several multi-stage fluidized bed setting conditions, and the following results were obtained:

[0069] 1. The pressure of the sludge pump in the filter press system 1 is 0.7MPa, the pressure of the squeeze pump is 0.95MPa, and the water content of the suspended matter sludge is reduced to 35%; the filtrate passes through the carrier circulating fluidized bed, and passes through the heavy metal adsorbent and the porous carrier The adsorption and collision effects of heavy metals can reduce the desorption of heavy metals, and the effective contact time can be increased through circulating fluidization. The average removal rate of heavy metals in various desulfurization wastewater can reach more than 98%, and the minimum removal rate can reach 95%. Set the seed flow The seed crystal dosing ratio of the fluidized bed is 1:3000, that is, 3 kg of seed crystals with a particle size of <2 mm are added per ton of water to be treated...

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Abstract

The invention relates to the technical field of environmental engineering wastewater treatment and discloses a multistage fluidized bed crystallization based desulfuration wastewater treatment method and system. According to the method and the system, suspended substances are removed from desulfuration wastewater through replacing a pre-sedimentation tank with a filter pressing mode, sludge is subjected to dewatering in a filter pressing and squeezing mode, heavy metals, magnesium ions and calcium ions in the desulfuration wastewater are separately separated in a crystal form by a multistage fluidized bed crystallization process, and the purity of magnesium hydroxide and calcium hydroxide in the desulfuration wastewater can be improved in a fluidizing manner, so that the method and the system can be applied to desulfurizing agents for flue gas desulfurization and can also be applied to other raw materials for industrial use. The multistage fluidized bed form runs continuously, and the degree of automatic control can be increased greatly, so that the stability of operation of a pretreatment device is improved, and the dosage of chemicals is lowered. In subsequent treatment, sodium chloride and sodium sulfate are separated by using the characteristic of separating monovalent salts and divalent salts through nanofiltration, and MVR evaporation concentration with high concentrating efficiency and freezing crystallization with high crystallizing efficiency are separately adopted according to physical properties of the two kinds of salts.

Description

technical field [0001] The invention relates to the technical field of environmental engineering wastewater treatment, especially the resource treatment application of high-salt wastewater. It aims at the zero-discharge treatment technology of desulfurization wastewater in thermal power plants, and specifically relates to a desulfurization wastewater treatment system based on multi-stage fluidized bed crystallization. Background technique [0002] The zero-discharge treatment process of desulfurization wastewater mainly includes pretreatment, membrane reduction and concentration treatment, evaporation crystallization and solidification treatment, reuse of desulfurization wastewater as reclaimed water, and further solid waste treatment and disposal of pollutants in desulfurization wastewater. The pretreatment is mainly to improve the original three-box technology, overcome the defects in the process operation of the three-box, optimize the design of dosing, flocculation and se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D3/04C01D5/00
CPCC01D3/04C01D5/00C02F9/00C02F1/04C02F1/001C02F1/442Y02P10/20
Inventor 黄奕军苑志华郑煜铭万忠诚
Owner SHENGFA ENVIRONMENT PROTECTION TECH XIAMEN CO LTD
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