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Salt crystallizing processing technology and device for zero discharge of high salt wastewater

A treatment process and technology for salty wastewater, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical industry, etc. It can solve problems such as blockage, production shutdown, and the inability of equipment to operate stably for a long period of time, and achieve high efficiency. High, no secondary pollution, significant economic and social benefits

Active Publication Date: 2015-12-30
JIANGSU SUNPOWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, unlike the traditional salt chemical evaporation and crystallization process, the crystallization salt treatment of high-salt wastewater is difficult to accurately obtain the physical parameters of the wastewater system due to the complexity of the wastewater composition and the fluctuation of water volume, resulting in process design parameters that deviate from the actual system. The medium device cannot run stably for a long period of time, especially the crystallization device, which is often shut down due to blockage

Method used

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  • Salt crystallizing processing technology and device for zero discharge of high salt wastewater
  • Salt crystallizing processing technology and device for zero discharge of high salt wastewater
  • Salt crystallizing processing technology and device for zero discharge of high salt wastewater

Examples

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Embodiment 1

[0027] Such as figure 1 As shown, a zero-discharge crystalline salt treatment process and device for high-salt wastewater, the process mainly includes pretreatment, evaporation, crystallization, carbonization and other processes, and the treatment process equipment includes at least a degassing tower, an evaporator, a crystallizer, and a carbonization furnace Wait. The high-salt wastewater can be processed through the above-mentioned process to obtain solid crystalline salt, and at the same time, the water can be recovered for factory reuse. The TDS of high-concentration brine in the evaporator is greater than 150,000mg / L; the TDS in the crystallizer is greater than 300,000mg / L, and the crystalline solid SS is 100,000-300,000mg / L; the crystallized salt removes organic matter and nitrate in the carbonization furnace, and the carbonization furnace The temperature is controlled at 600-700°C, the carbonization time is 5-30min, and the tail gas of the carbonization furnace enters ...

Embodiment 2

[0032]The high-salt wastewater is treated with acid and alkali stirring, membrane chemical pretreatment (removing 90% of the saline wastewater), preheating with desalted water, and degassing treatment, and then the wastewater enters the evaporator, using externally provided low-pressure steam (factory Waste steam, exhaust gas waste heat recovery steam or medium pressure steam after decompression and decompression steam), evaporate and crystallize the concentrated brine in the evaporator tube bundle, after evaporation, the TDS (total dissolved solids) in the saline wastewater is 150000mg / L or more, and the separated steam is condensed into clean water and then recycled. After the evaporation process, the salty waste water is crystallized through the crystallizer, wherein the crystallizer is connected to the carbonization furnace, and the heat source of the crystallizer is provided by the high-temperature flue gas heat of the carbonization furnace, and the high-temperature flue ...

Embodiment 3

[0034] In the above two embodiments, the evaporator can be one of forced circulation evaporator, vertical falling film evaporator, and horizontal falling film evaporator, and the evaporation process adopts single-effect or multi-effect evaporation. Use one or a combination of external steam supply, mechanical vapor compression, and thermal vapor compression. The crystallizer adopts one of forced circulation crystallizer, DTB type crystallizer, and OSLO type crystallizer; in the crystallization process, one or a combination of external steam supply, mechanical steam compression, and thermal steam compression is used , and the operating pressure of the crystallizer adopts positive pressure or negative pressure. The flow velocity of the fluid in the heating tube of the crystallizer is 1-3m / s, and the temperature rise of the fluid passing through the heating tube is less than 2°C. The carbonization furnace can be a rotary kiln or a pusher kiln, and its heating method is gas heati...

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Abstract

The invention discloses a salt crystallizing processing technology and device for zero discharge of high salt wastewater. The technology mainly comprises processes of preprocessing, evaporation, crystallization, carbonization and the like; a crystallizer mainly comprises a cylinder body, a double-horn shaped cylinder body, a washing tube, a cleaning port, a monitor, a mixing agitator and a heating device; firstly, the mixing agitator is subjected to relative preprocessing operations, then wastewater enters an evaporator, low-pressure steam provided by the outside is used for evaporating and crystallizing salt-containing wastewater in evaporator bundles, after the evaporation process is finished, the salt-containing wastewater is crystallized by the crystallizer, finally, organic matters and nitrate in the crystallized salt are removed in a carbonization stove, exhaust gas of the carbonization stove enters a combustion system, high temperature flue gas heat of the carbonization stove is subjected waste heat recovery, and low-pressure steam generated by a waste heat boiler is used as steam for external supply of the crystallizer. According to the salt crystallizing processing technology and device for zero discharge of the high salt wastewater, the high salt wastewater is further processed, the water recovery rate can reach 95% or above, at the same time, solid salt is crystallized, and zero discharge of high salt wastewater is realized.

Description

technical field [0001] The invention relates to a process for treating crystalline salt, in particular to a process and device for treating high-salt wastewater with zero discharge of crystalline salt. Background technique [0002] As the country pays more attention to environmental protection, it begins to control the total amount of discharge. General sewage can be discharged up to standard through biological and chemical treatment technologies. However, for a large amount of high-salt wastewater produced by national pillar industries such as petrochemical, coal chemical, electric power, oil extraction, and mining, only 75% to 85% of the wastewater can be recovered through traditional methods such as chemical, membrane, and reverse osmosis. 15% to 25% of the high-concentration saline wastewater has not been effectively treated so far, and some are stored in exposure tanks. In the event of mountain torrents, geological disasters, etc., once the high-concentration saline was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D3/04
CPCY02P20/10Y02P20/129
Inventor 郭宏新李东刘丰彭艳梅陈飞
Owner JIANGSU SUNPOWER TECH
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