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Device capable of realizing zero discharge of desulfurization wastewater

A desulfurization wastewater and zero-discharge technology, which is applied in general water supply conservation, gaseous effluent wastewater treatment, dehydration/drying/concentrated sludge treatment, etc., can solve problems such as environmental hazards, high design costs, and unfavorable industrialization promotion. Protect the ecological environment and achieve zero emissions

Active Publication Date: 2017-02-15
SHENGFA ENVIRONMENT PROTECTION TECH XIAMEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Direct discharge will cause serious harm to the environment, so it must be treated to discharge
The existing zero-discharge device for desulfurization wastewater has a complex structure and high design cost, which is not conducive to the promotion of industrialization

Method used

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  • Device capable of realizing zero discharge of desulfurization wastewater
  • Device capable of realizing zero discharge of desulfurization wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] see figure 1 and figure 2 , a zero-discharge device for desulfurization wastewater in the present embodiment 1, comprising a raw water regulating tank 1, an alkalization module 2, a sludge separation and recovery module 3, a decalcification module 4, a reduction module 5 and a solidification module 6,

[0029] After the desulfurization wastewater passes through the raw water adjustment tank 1 to adjust the water volume, it enters the alkalization module 2, in which lime milk and / or sodium hydroxide are added to adjust the pH value of the water, and the flocculation reaction is carried out to remove the magnesium and sulfuric acid in the desulfurization wastewater The root ion precipitates to form flocs, and the alkalization module 2 includes a reaction tank 21. During the flocculation reaction, calcium hydroxide and sodium hydroxide 22 are added to the reaction tank 21 to adjust the pH value in the reaction tank to be greater than 10, and the flocculation reaction form...

Embodiment 2

[0037] refer to figure 1 and figure 2 As shown, the basic structure of this embodiment is roughly the same as that of Embodiment 1, the difference is that the decalcification module 4 in this embodiment includes a sewage collection box and a tubular microfiltration membrane system, and the desulfurization wastewater enters the sewage collection box, The desulfurized flue gas is extracted in the sewage collection box for aeration, and the carbon dioxide in the flue gas reacts with the calcium ions in the waste water. At the same time, sodium hydroxide is added to maintain the pH value of the waste water above 10.0. The effluent from the sewage collection box enters the tubular microfiltration membrane system for Solid-liquid separation, the wastewater from the clear water side of the tubular microfiltration membrane system enters the back-end reduction module 5, and the wastewater from the concentrated water side of the tubular microfiltration membrane system has a high solid ...

Embodiment 3

[0040] refer to figure 1 and figure 2 As shown, in the present embodiment 3, the salinity tester is an online salinity meter, and the desulfurization wastewater with a salinity lower than 10000mg / L is returned to the desulfurization island, and the salinity is higher than the high salinity wastewater of 20000mg / L The desulfurization waste water enters the waste water collection tank, and the salinity is 10000mg / L~30000mg / L, respectively enters the desulfurization island and the waste water collection tank according to the ratio. Wastewater collection tank.

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Abstract

The invention belongs to the technical field of zero discharge of desulfurization wastewater from power plants. A device capable of realizing zero discharge of desulfurization wastewater is characterized by comprising a raw water regulating pond, an alkalization module, a sludge separating and recycling module, a calcium removal module, a reduction module and a curing module; the desulfurization wastewater flows into the alkalization module for a flocculation reaction after the volume is adjusted by the raw water regulating pond, magnesium and sulfate radical ions in the desulfurization wastewater are deposited to form floccule, the flocculated desulfurization wastewater flows into the sludge separating and recycling module for sludge sorting, the sorted sludge is treated separately, the sorted desulfurization wastewater is subjected to salinity testing, the low-salinity desulfurization wastewater flows back to a desulphurization island, the high-salinity desulfurization wastewater flows into the calcium removal module, so that the concentration of calcium ions in the desulfurization wastewater is reduced, and water is softened; the pH of outflow water from the calcium removal module is regulated until the water is neutral, and the water flows into the reduction module which adopts a nanofiltration system and a reverse osmosis system for desalination. The device can realize zero discharge of the desulfurization wastewater.

Description

technical field [0001] The invention belongs to the technical field of zero-discharge treatment of desulfurization wastewater in power plants, and in particular relates to a device for zero-discharge of desulfurization wastewater. Background technique [0002] With the rapid development of my country's energy industry and the construction of large-scale coal-fired power plants, fuel consumption continues to increase, SO 2 The amount of emissions is increasing, and the resulting air pollution is also becoming more and more serious. It is imminent to take desulfurization measures. SO 2 The control approach of the combustion: desulfurization before combustion, desulfurization during combustion and desulfurization after combustion, that is, flue gas desulfurization (FGD). Currently, flue gas desulfurization is considered to be an effective way to control SO 2 The most efficient way to reduce emissions. Limestone-gypsum wet flue gas desulfurization is the most widely used and...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F11/12C02F103/18
CPCY02A20/131C02F9/00C02F1/04C02F1/441C02F1/442C02F1/444C02F1/5236C02F1/66C02F5/08C02F11/127C02F2103/18
Inventor 刘其彬马明军
Owner SHENGFA ENVIRONMENT PROTECTION TECH XIAMEN CO LTD
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