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Advanced wastewater hardness removal method

A waste water, high hardness technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, adsorbed water/sewage treatment, etc., can solve the problems of poor water quality, increased treatment costs, scaling, etc.

Active Publication Date: 2012-03-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the reduction of water resources, the quality of water used is gradually deteriorating, especially some water bodies with high hardness and high alkalinity are also used as water sources. Therefore, in order to ensure the quality of water used and meet the requirements of production equipment, it is necessary to Treat the water quality to a certain extent
[0003] Whether it is the demineralized water used in the production process, or the general water source used in the circulating water system and the reuse of wastewater after sewage treatment, the hardness of the raw water will have a certain impact on the use unit, although such as adding water to the circulating water system and reverse osmosis membrane system antiscaling agents, but they cannot avoid the problem of system scaling, so in the case of high hardness in the used water source, hard removal technology must be adopted to reduce the hardness of the water, so that it will not be used during use. Scaling problem occurs
The hardness removal technology that has been adopted now is mainly the technology of adding alkali to remove hardness. The hard removal process is drug addition + precipitation + filtration. The process is relatively simple, but the hardness removal effect is not very high. Sometimes the hardness of the effluent is several hundred mg / L. After dehardening, the water quality will have scaling problems during use, which increases the cost of follow-up treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Reverse osmosis concentrated water in a petrochemical plant up to the standard sewage reuse device, with a treatment capacity of 5m 3 / h, the indicators and treatment results of each pollutant in the wastewater are shown in Table 1.

[0017] The waste water is treated as follows:

[0018] 1) First, add sodium hydroxide (concentration 25%) and sodium carbonate (concentration 10%) to the wastewater at the same time. 30 minutes;

[0019] 2) After the waste water has undergone the dosing reaction, carry out the Gore membrane filter filtration unit to remove a large amount of suspended particles (mainly calcium carbonate and magnesium carbonate) produced in the reaction process, and the residue in the backwash process with a solid content of 3% The concentration solution is discharged from the device, and the filtered water enters the next unit for treatment;

[0020] 3) The wastewater after the Gore membrane filter is adjusted to pH 6.8 with hydrochloric acid (27%), and ...

Embodiment 2

[0024] Underground slightly polluted water in an oil refinery, with a treatment capacity of 100m 3 / h, the indicators of various pollutants in the water body are shown in Table 2:

[0025] The waste water is treated as follows:

[0026] 1) First, add sodium hydroxide (concentration 30%) and sodium carbonate (concentration 20%) to the wastewater at the same time. 90 minutes;

[0027] 2) After the wastewater has undergone the dosing reaction, carry out the Gore membrane filter filtration unit to remove a large amount of suspended particles (mainly calcium carbonate and magnesium carbonate) produced in the reaction process, and the residue in the backwash process with a solid content of 3.5% The concentration is discharged from the device, and the effluent enters the next unit for treatment;

[0028] 3) The wastewater after the Gore membrane filter is adjusted to pH 7.5 with hydrochloric acid (27%), and then enters the resin adsorption unit for deep hard removal treatment to r...

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Abstract

The invention relates to an advanced wastewater hardness removal method, which belongs to the field of industrial wastewater comprehensive treatment. The method comprises the following steps: (1) adding hardness removal agents NaOH and Na2CO3 according to a certain ratio of the total content of calcium ion and magnesium ion in the wastewater, and adding the wastewater into a hardness removal reactor to be reacted for a certain period; (2) filtering the reacted wastewater in a gore filter to remove suspended matters and residues, and deeply removing the hardness of effluent, in which the suspended matters and residues are removed, in a resin unit; and (3) adjusting pH value of the wastewater from the gore filter, and deeply removing the hardness of the wastewater in the resin unit to obtain effluent with the hardness less than 1 mg / L so as to provide high-quality water resource for subsequent treatment or use. According to the advanced wastewater hardness removal method provided by the invention, the hardness of the wastewater can be deeply removed by adding the hardness removal agents, reacting in the mixing reactor, filtering in the gore filter and deeply treating by resin, and the hardness of the treated wastewater is less than 1 mg / L, thereby providing high-quality water resource for subsequent use or further treatment.

Description

technical field [0001] The invention relates to the field of comprehensive treatment of industrial wastewater, in particular to a treatment method for biochemical standard sewage, circulating water sewage, reverse osmosis concentrated water and high-hardness wastewater used in other production processes, and belongs to a method for industrial wastewater treatment. Background technique [0002] With the development of the economy, the status of water in industrial production is becoming more and more important. Whether it is used as a raw material in the production process or as an auxiliary system such as circulating water, it is indispensable, and the annual consumption is increasing year by year. However, with the reduction of water resources, the quality of water used is gradually deteriorating, especially some water bodies with high hardness and high alkalinity are also used as water sources. Therefore, in order to ensure the quality of water used and meet the requiremen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F5/08C02F1/44C02F1/28
Inventor 彭海珠刘正龚小芝赵鹏
Owner CHINA PETROLEUM & CHEM CORP
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