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

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

Example Embodiment

[0027] Example 1:

[0028] see figure 1 and figure 2 , a device for zero discharge of desulfurization wastewater in this embodiment 1 includes a raw water conditioning 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 is adjusted by the raw water adjustment tank 1, it enters the alkalization module 2. In the alkalization module 2, lime milk and / or sodium hydroxide are added to adjust the pH value of the water, and a flocculation reaction is performed to remove the magnesium and sulfuric acid in the desulfurization wastewater. Root ions are precipitated to form flocs. 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. The flocculation reaction form...

Example Embodiment

[0036] Example 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 tank and a tubular microfiltration membrane system, and the desulfurization wastewater enters the sewage collection tank, The flue gas after desulfurization is extracted from the sewage collection tank for aeration, and the carbon dioxide in the flue gas is used to react with calcium ions in the wastewater, and sodium hydroxide is added to maintain the pH value of the wastewater above 10.0. For solid-liquid separation, the waste water from the clean water side of the tubular microfiltration membrane system enters the back-end reduction module 5. The waste water from the concentrated water side of the tubular microfiltration membrane system has high solid content, part of which is returned to the sewage collection tank, and part...

Example Embodiment

[0039] Example 3:

[0040] refer to figure 1 and figure 2 As shown in Example 3, the salinity tester is an online salinity meter, the desulfurization wastewater with low salinity with salinity lower than 10000mg / L is returned to the desulfurization island, and the high salinity with salinity higher than 20000mg / L The desulfurization wastewater enters the wastewater collection tank, and the salinity is between 10,000mg / L and 30,000mg / L into the desulfurization island and the wastewater collection tank respectively. 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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