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Method for preventing silicon scale from evaporating and desalting without silicon removal

A technology of silica scale and evaporation unit, which is applied in the field of evaporation and desalination without silicon removal and anti-silicon scale, can solve the problems of complex process flow, large solid waste content, high operating cost, etc., and achieve simple technical process, low production cost and operability strong effect

Inactive Publication Date: 2020-10-02
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a method for evaporation and desalination without removing silicon and preventing silicon scale, which overcomes the deficiencies of the above-mentioned prior art, and can effectively solve the problems of complicated process flow, high operating cost and solid waste in conventional silicon-containing water evaporation treatment. The problem of large content and difficult disposal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: The method of not removing silicon and preventing silicon scale from evaporating and desalting is carried out according to the following steps: first step, adding lime and soda to the silicon-containing raw water for chemical dehardening to remove calcium, magnesium and phosphoric acid in the scale salt and silicon dioxide to obtain the first dehardened water; the second step, the first dehardened water is precipitated and filtered to remove suspended solids, corrosion products and microbial slime in the water to obtain the second dehardened water and sludge; the third In the first step, the sludge is dehydrated as non-toxic waste and disposed of as non-toxic waste. In the second dehardening water, the COD and hardness ions in the water are removed through ion exchange resins to obtain the third dehardening water. In the fourth step, a pH regulator is added to the third dehardening water. When the pH value of the third dehardened water is adjusted to 10 to ...

Embodiment 2

[0024] Embodiment 2: The method of not removing silicon, preventing silicon scaling, evaporation and desalting is carried out according to the following steps: the first step, adding lime and soda to the silicon-containing raw water for chemical hard removal, and removing calcium, magnesium, and phosphoric acid in the scale salt and silicon dioxide to obtain the first dehardened water; the second step, the first dehardened water is precipitated and filtered to remove suspended solids, corrosion products and microbial slime in the water to obtain the second dehardened water and sludge; the third In the first step, the sludge is dehydrated as non-toxic waste and disposed of as non-toxic waste. In the second dehardening water, the COD and hardness ions in the water are removed through ion exchange resins to obtain the third dehardening water. In the fourth step, a pH regulator is added to the third dehardening water. When the pH value of the third dehardened water is adjusted to 1...

Embodiment 3

[0025] Embodiment 3: As an optimization of the above embodiments, the evaporation unit adopts one of mechanical compression evaporation, thermal compression evaporation and multi-effect evaporation.

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Abstract

The invention relates to the technical field of wastewater treatment, in particular to a method for preventing silicon scale evaporation and desalination without silicon removal, which comprises the following steps: adding lime and soda into silicon-containing raw water to perform chemical hardness removal to obtain first hardness-removed water; precipitating and filtering the first hardness-removed water to obtain second hardness-removed water and sludge; dehydrating the sludge to be buried as non-toxic waste, removing the COD and hardness ions in the second hardness-removed water through ionexchange resin, and third hardness-removed water is obtained; and adding a pH regulator into the third hardness-removed water, then enabling the third hardness-removed water to enter an evaporation unit to be evaporated and desalted to obtain desalted water and a small amount of concentrated water, and recycling the desalted water. By adjusting the pH value of raw water, the solubility of siliconis increased, the evaporation process is not affected by silicon scale, and the method is simple in technical process, high in operability, low in production cost and suitable for newly-built or transformed wastewater evaporation treatment projects.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, and relates to a method for desalting without removing silicon, preventing silicon scale evaporation and desalting. Background technique [0002] In the fields of oilfield, chemical and other wastewater treatment, some wastewater with high salt content and complex composition is usually treated by evaporation process for reuse and environmental protection. If the silicon content in the wastewater is high (≥400mg / L after evaporation and concentration), during the evaporation process, with the increase of the solution concentration, silicic acid, sodium silicate and other substances will be formed, which will be precipitated from the water and block the evaporator and process. pipeline. Therefore, in China, the method of first removing silicon and then evaporating is usually used to treat this type of water, but there are problems such as large dosage of silicon removal process, low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F9/00C02F1/04C02F1/42C02F1/66C02F5/08
Inventor 周京都王爱军武文静杨萍萍罗春林张志庆郑帅王蒙欣林双
Owner BC P INC CHINA NAT PETROLEUM CORP