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Processing technology of bitter salt water

A technology for treating brackish water, which is applied in the field of brackish water treatment and brackish water, can solve the problems of membrane pollution, low recovery rate, and high cost, and achieve the goal of reducing costs, increasing recovery rate, and reducing operating costs Effect

Inactive Publication Date: 2019-10-08
青岛沃赛环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to overcome the shortcoming that prior art exists, seek to design a kind of brackish water treatment process, solve existing brackish water treatment process in processing high salinity, high hardness (calcium content exceeds 10g / L), manganese aluminum Brackish water with high content has high cost and low recovery rate, and there is a problem of membrane fouling

Method used

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  • Processing technology of bitter salt water

Examples

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Effect test

Embodiment 1

[0024] Such as figure 1 As shown, adopting the brackish water treatment process provided by the present invention to process the brackish water with a calcium content greater than 10g / L, a pH value of 7.5, a salt content greater than 100g / L, and a manganese and aluminum content greater than 500ppb, specifically includes the following step:

[0025] (1) Use microfiltration or ultrafiltration system for pre-filtration, the material of the filter membrane used is polysulfone, polyether peak or polyvinylidene fluoride, the feeding pressure is less than 10bar, and the recovery rate of water is higher than 90%, which can Filter out particles with a particle size of 0.01-0.1 μm, used to separate and reduce the content of suspended solids in brackish water, and the turbidity of pre-filtered brackish water is <1NTU;

[0026] (2) Add 1% NaOH to the brackish water after pre-filtration to control the pH to 10-10.5, and use the sludge obtained from the chemical reaction of the third-stage...

Embodiment 2

[0032] Such as figure 2 Shown is the process flow chart of the traditional process for treating brackish water. As shown in the figure, first use multimedia filtration to remove the turbidity in the water, reduce the turbidity in the water to below 3NTU, and then use activated carbon filter, activated carbon filter Remove odor, organic matter, colloid, iron and residual chlorine in the water, and then use ultrafiltration. The ultrafiltration pore is less than 0.01 micron, which can completely filter out bacteria, rust, colloid and other harmful substances in the water, and retain the original trace elements in the water. and minerals. Afterwards, a reverse osmosis membrane is used to generate permeate and concentrate. The permeate is the clean water of the product, and the concentrate is drained (the problem of concentrate treatment will arise). This technique can handle common brackish water, but when being used for processing the special brackish water mentioned in the pre...

Embodiment 3

[0034] Adopt the brackish water treatment technology provided by the present invention to process brackish water, the brackish water water quality is specifically shown in the raw water quality in Table 1, specifically comprises the following steps:

[0035] (1) The microfiltration system is used for pre-filtration, the material of the membrane used is polysulfone, the feeding pressure is less than 10 bar, the recovery rate of water is higher than 90%, and it can filter out particles with a particle size of 0.01-0.1 μm. Pre-filtration After the brackish water turbidity <1NTU;

[0036] (2) Add 1% NaOH to the brackish water after pre-filtration to control the pH to 10-10.5, and use the sludge obtained from the chemical reaction of the third-stage nanofiltration concentrate in the back-end process to carry out precipitation and adsorption under alkaline conditions , remove the manganese and aluminum precipitates in the water, and then filter with an ultrafiltration system. After ...

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Abstract

The invention discloses a processing technology of bitter salt water. The processing technology of the bitter salt water comprises the following steps that pre-processing is conducted by adopting an ultrafiltration membrane or microfiltration; pre-processing discharged water is pumped into a precipitin reaction tank, sodium hydroxide is added to adjust pH to be of 10-10.5, a precipitator is addedat the same time, and ions such as manganese, aluminum and iron are removed; a precipitation is filtered and removed by using microfiltration or ultrafiltration, a certain amount of scale inhibitor isadded into a filter liquid, and the filter liquid is transferred in a nanofiltration system to be processed; sodium carbonate and sodium hydroxide are added into nanofiltration system penetrating fluid, magnesium hydroxide calcium hydroxide and calcium carbonate precipitation is generated, calcium and magnesium left in water are removed, and alkaline precipitation obtained by filtering serves asthe precipitator; and filtering discharged water is pumped into a vaporization system, the water is separated from salt, pure water and product salt are finally obtained, and the product salt can serve as edible salt or medical grade salt. The precipitator generated in the process is utilized repeatedly, the using amount of chemical agents during chemical processing is reduced, and the operating cost is lowered.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a process for treating brackish water, and is particularly suitable for treating brackish water with high salinity, high hardness and high manganese and aluminum content. Background technique [0002] In water bodies, if the total dissolved solids content is >1500mg / L or the chloride and sulfate content is >250mg / L, it is called brackish water. In Middle Eastern countries and western China where water is scarce, due to their special geographical reasons, most of the groundwater is brackish water, which is harmful to industrial and agricultural production and cannot be used directly. It needs to be treated before it can be used in industry and agriculture. Production. In the traditional process, the pretreated wastewater is generally firstly treated with chemical treatment or reverse osmosis or nanofiltration to remove divalent ions in the water, and then reverse os...

Claims

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Application Information

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IPC IPC(8): C02F9/10
CPCC02F1/04C02F1/442C02F1/444C02F1/5236C02F5/00C02F9/00C02F2301/08
Inventor 莫文辉周志艳西蒙·拉斯克里
Owner 青岛沃赛环保科技有限公司
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