A zero-discharge method for high-temperature and high-salt wastewater

A high-temperature, high-salt, zero-discharge technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Significant social and environmental benefits, reducing energy consumption, and achieving high-efficiency utilization

Active Publication Date: 2018-11-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two patents did not provide a treatment method for the concentrated water problem of membrane distillation, which brought new troubles to the ecological environment

Method used

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  • A zero-discharge method for high-temperature and high-salt wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] For a schematic diagram of the process, see figure 1 . The water quality characteristics of high-temperature and high-salt wastewater in the figure are: wastewater temperature 60°C, wastewater pH 6.5, conductivity 10000μs / cm, COD cr 0 mg / L, Na + 2000mg / L, Cl - 2500mg / L, total hardness (CaCO 3 ) 1000mg / L.

[0085] Proceed as follows:

[0086] (1) Nanofiltration. The high-temperature and high-salt wastewater with a certain temperature enters the nanofiltration unit for nanofiltration treatment to remove multivalent ions such as hardness and a small amount of organic matter in the high-temperature and high-salt wastewater.

[0087] After separation and concentration by the nanofiltration unit, the nanofiltration product water enters step (2) for processing, and sodium carbonate is added to the nanofiltration concentrated water to precipitate calcium ions to obtain calcium residue, which is then concentrated and dried. The dosage of sodium carbonate is Ca 2+ : The mo...

Embodiment 2

[0102] For a schematic diagram of the process, see figure 1 . The water quality characteristics of high-temperature and high-salt wastewater in the figure are: wastewater temperature 70°C, wastewater pH 7, conductivity 15000μs / cm, COD cr 50mg / L, Na + 3000mg / L, Cl - 3500mg / L, total hardness (CaCO 3 ) 2000mg / L.

[0103] The operation steps of embodiment 2 are the same as embodiment 1. Wherein, the difference from Example 1 is that sodium sulfate is added to the nanofiltration concentrated water to precipitate calcium ions, and the dosage of sodium sulfate is Ca 2+ : The molar ratio of sodium sulfate is 1:1; the supernatant of nanofiltration concentrated water after calcium ion precipitation is adsorbed by granular activated carbon, and the dosage of granular activated carbon is granular activated carbon:COD The mass ratio is 10:1 ; The pH of the nanofiltration product water is adjusted to 6.5 with hydrochloric acid, and then enters the membrane distillation unit for deep c...

Embodiment 3

[0117] For a schematic diagram of the process, see figure 1 . The water quality characteristics of high-temperature and high-salt wastewater in the figure are: wastewater temperature 80°C, wastewater pH 7.5, conductivity 20000μs / cm, COD cr 80mg / L, Na + 4000mg / L, Cl - 5000mg / L, total hardness (CaCO 3 ) 3000mg / L.

[0118] The operation steps of embodiment 3 are the same as embodiment 1. Wherein, different from Example 1, the nanofiltration concentrated water is added with a mixture of sodium carbonate and sodium sulfate for precipitation of calcium ions, and the dosage of the mixture of sodium carbonate and sodium sulfate is Ca 2+ The molar ratio of (sodium carbonate+sodium sulfate) is 1:1; the supernatant of nanofiltration concentrated water after calcium ion precipitation adopts powdered activated carbon to carry out activated carbon adsorption, and the dosage of powdered activated carbon is powdered activated carbon: the quality of COD The ratio is 2:1; the nanofiltrati...

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Abstract

The invention relates to a high-temperature high-salinity wastewater zero-discharging method. Firstly, a high-temperature-resisting nanofiltration membrane is adopted to remove multivalent ions and a little amount of organic matter in wastewater, then a membrane distillation technology is adopted to conduct deep concentration treatment on the wastewater, membrane-distillation concentrated water is subjected to evaporative crystallization treatment to enable salt in the membrane-distillation concentrated water to crystallize out, and centralized drying disposal is performed. Salt is added into the nanofiltration concentrated water produced in the treatment process to perform precipitation treatment so as to obtain calcium residues, centralized drying disposal is performed, supernate obtained after precipitation is subjected to activated carbon adsorption, and producing water obtained after activated carbon adsorption and nanofiltration feed water are mixed and fed into a nanofiltration unit for circular treatment. Membrane-distillation producing water and evaporative-crystallization producing water can be both reused for a production process. By means of the high-temperature high-salinity wastewater zero-discharging method, residual heat of the wastewater itself is effectively utilized while wastewater zero discharging is achieved, the energy consumption of the whole technological process is reduced, and efficient utilization of waste water resources and energy is achieved. The high-temperature high-salinity wastewater zero-discharging method has remarkable social benefit and environmental benefit.

Description

technical field [0001] The invention relates to the treatment of high-temperature and high-salt wastewater by membrane separation technology, in particular to a zero-discharge method of high-temperature and high-salt wastewater. In particular, it refers to the zero-discharge method of treating high-temperature and high-salt wastewater by using "nanofiltration + membrane distillation + evaporation crystallization". Background technique [0002] In recent years, the high-salt wastewater produced by petrochemical enterprises has become a difficult problem to deal with. Some high-salt wastewater has a certain temperature. If this type of wastewater is discharged directly, it will not only cause serious pollution of the salt to the ecological environment, but also cause great harm. Energy waste. Therefore, there is an urgent need to seek new separation technologies to solve the problem of treatment and discharge of such wastewater. [0003] Nanofiltration (NF) is a membrane sep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10
Inventor 张新妙平春霞彭海珠
Owner CHINA PETROLEUM & CHEM CORP
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