Softening method of high-hardness water

A high hardness and softening treatment technology, applied in the direction of scale removal and water softening, chemical instruments and methods, separation methods, etc., can solve problems such as gray water system jamming, reduce wastewater discharge, solve scaling problems, and reduce chemicals The effect of fees

Pending Publication Date: 2022-08-02
CNOOC TIANJIN CHEM RES & DESIGN INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to overcome the defects of the prior art, the present invention provides a softening method for highly hard water, which uses a combination of a pretreatment unit and a salt separation unit such as nanofiltration and electrodialysis, as well as a heat exchange cooling method, which solves the problem that nanofiltration cannot The problem of jamming directly applied to the gray water system with high temperature, high turbidity and high silicon

Method used

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  • Softening method of high-hardness water
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  • Softening method of high-hardness water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] This embodiment is a method for fully softening coal gasification gray water that can realize resource utilization, and is aimed at the following types of users: not only the hardness of the gray water system needs to be removed, but also the recycling of gray water sewage wastewater. The grey water sewage wastewater cannot be directly received, and it is necessary to use an ammonia distillation tower to remove most of the ammonia nitrogen before entering the sewage treatment plant. The ammonia distillation tower generally requires that the hardness of the incoming water is not higher than 100mg / L, so it is necessary to soften the incoming tower wastewater.

[0085] The process flow of this embodiment is as follows figure 1 Shown: water is diverted from the outlet of the settling tank 2 to the pretreatment unit 4, cooled by the heat exchanger 5 and then enters the salt separation unit 6, and a part of the produced water of the salt separation unit 6 returns to the grey ...

Embodiment 2

[0107] The technical process of this embodiment is basically the same as that of embodiment 1, except that the salt separation unit is changed from nanofiltration to frequent reverse electrodialysis (EDR), the hard removal unit is pure chemical method, and the separation unit is changed to flat ultrafiltration membrane. The concrete test operation of this embodiment is as follows:

[0108] 1) Preprocessing unit:

[0109] In the mixing tank with stirring, liquid alkali was used to adjust the pH to about 8.0, and 500 ppm of sodium metaaluminate was added at the same time. After 30 minutes of sedimentation in the sedimentation zone, the clear liquid was directly overflowed to the clear liquid storage tank, and then pumped to the exchange The heat exchanger is sent to the salt separation unit after heat exchange. Periodically discharge the settled sludge.

[0110] 2) Salt division unit:

[0111] The pretreated qualified water (3 / h) sent to the reuse unit, concentrated water (0...

Embodiment 3

[0125] This embodiment is a complete softening method of coal gasification grey water, which is designed for the following users: the water replenishment of the grey water system is desalinated water, there is no need to reuse the waste water discharged from the grey water, and at the same time, the discharged grey water needs to be dehardened and then sent to the The demand for reducing ammonia nitrogen to the ammonia distillation tower and sending it to the sewage system.

[0126] The process route of this embodiment is as follows figure 2 Shown: water is diverted from the outlet of the settling tank 2 to the pretreatment unit 4, and after cooling by the heat exchanger 5, it enters the salt separation unit 6. The concentrated water of 6 enters the hardening unit 8, the product water of the hardening unit 8 all enters the separation unit 9, and the water phase of the separation unit 9 enters the ammonia distillation tower 10 to remove ammonia nitrogen and then send it to the...

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Abstract

The invention discloses a softening treatment method for high-hardness water, which comprises a pretreatment unit and a salt separation unit, and comprises the following steps: 1) introducing the high-hardness water into the pretreatment unit, and removing turbidity and silicon in the high-hardness water in the pretreatment unit to ensure that the turbidity of the effluent is less than or equal to 20NTU and the silicon (based on SiO2) is less than or equal to 20mg/L; (2) cooling the pretreated effluent, feeding the cooled effluent into a salt separation unit for salt separation, mainly retaining calcium and magnesium ions on a concentrated water side, and mainly feeding ammonia nitrogen into a produced water side; concentrated water enters a sewage treatment plant or is further softened, and produced water is conveyed to a backwater system. The method preferably comprises a recycling unit, so that resource utilization is realized. According to the method, the removal effect that the total hardness of high-hardness water with the hardness larger than 500 mg/L is reduced by 50-98% can be achieved; and especially when being used for coal gasification ash water softening treatment, the softening agent has beneficial hardness removal effect, simultaneously removes silicate scales, effectively solves the problem of scaling of a gasification furnace system, and prolongs the stable operation period.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a softening method and a full softening method for high-hardness water. Background technique [0002] China is rich in coal resources, and coal chemical industry will occupy an increasingly important position in China's chemical industry. The synthesis gas produced by coal gasification is the raw material for the preparation of various products such as hydrogen, synthetic ammonia, methanol, and natural gas. The progress of coal gasification technology has driven the overall development of coal chemical technology, which can ensure that coal is used as raw material to produce synthesis gas for downstream products. reliability and stability. The slag water treatment process is an important part of the coal gasification process, and its stable operation plays a decisive role in the long-term stable operation of the entire gasifier. The black water and gray water of the sla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F1/44C02F1/46C02F1/463C02F1/469C02F5/00C02F103/34
CPCC02F9/00C02F1/4602C02F1/463C02F5/00C02F1/441C02F1/44C02F1/001C02F2201/46115C02F2103/34C02F1/442C02F1/4693C02F1/444Y02A20/131
Inventor 姚光源杨军朱田震贺胜如何爱珍于德泽郭忠斌肖立光刘建秋陶蕾滕厚开陈爱民陈云璞秦立娟张迪彦赵新星王宁
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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