Silicon-containing wastewater treatment method

A treatment method and waste water technology, applied in water/sewage multi-stage treatment, neutralized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of large volume, unsolvable gel, large dosage of chemicals, etc. problem, achieve simple operation process, solve the problem of easy gelation of SiO2, and ease the use conditions

Active Publication Date: 2010-06-23
CHINA PETROLEUM & CHEM CORP +1
View PDF0 Cites 50 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using the method of first neutralization and then sedimentation, it is easy to produce a large amount of gel, high water content, large volume, difficult to press filter into a cake, and the sedimentation speed is slow, the residual turbidity is high, and the sedimentation colloid is not easy to filter and remove. If the existing flocculants on the market are used for treatment, the cost will be higher and the production cost will be increased.
[0004] Commonly used water

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This example illustrates the method for treating silicon-containing wastewater of the present invention.

[0026] Get silicon dioxide mass concentration and be 1 liter of silicon-containing waste water of 38.9g / L, add 360 grams of oil refining FCC waste catalyst dust (average particle diameter 150 μ m) that is taken from the oil refinery catalyst production plant, slowly add concentration under stirring condition 250g / L sulfuric acid solution, while monitoring the pH of the solution to 8.2, get the supernatant to measure its turbidity and filtration rate, the results are shown in Table 1.

[0027] Add 5 mg of polyacrylamide flocculant (Zhengzhou Jinglian Water Purification Material Co., Ltd., Jingyang Brand), stir and let it settle.

[0028] Turbidity is a method to investigate the gel degree of flocculation. If the filtration speed is fast, it means that the problem that the silica gel is not easy to filter has been solved, and a funnel (a conventional glass funnel, av...

Embodiment 2

[0032] This example illustrates the method for treating silicon-containing wastewater of the present invention.

[0033] Take 1 liter of silicon-containing wastewater with a silicon dioxide mass concentration of 20.4g / L, add 10 grams of diatomite (Qingdao Tuosheng Diatomite Co., Ltd., DP1200), and slowly add a sulfuric acid solution with a concentration of 500g / L under stirring conditions. Simultaneously monitor the solution pH to 4.7 according to the same method as in Example 1, get the supernatant and measure its turbidity and filtration speed according to the same method as in Example 1, the results are shown in Table 1.

Embodiment 3

[0035] This example illustrates the method for treating silicon-containing wastewater of the present invention.

[0036] Take 1 liter of silicon-containing wastewater with a silicon dioxide mass concentration of (32.4g / L), add 270 grams of talcum powder (Liaoning Beihai Industrial Co., Ltd., AJ75-99.9GB), and slowly add a concentration of 400g / L under stirring. Hydrochloric acid solution, monitor solution pH to 7.9 according to the method identical with embodiment 1 simultaneously, get supernatant and measure its turbidity according to the method identical with embodiment 1, the result is as shown in table 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a silicon-containing wastewater treatment method. The silicon-containing wastewater treatment method provided by the invention comprises: adding a nucleation coagulant aid to silicon-containing wastewater and mixing the silicon-containing wastewater with the nucleation coagulant aid, wherein the nucleation coagulant aid is an insoluble solid which serves as a growing core capable of allowing granular micro-substances that are suspended in water and not easy to coagulate to aggregate, grow up and settle; and regulating the pH of the silicon-containing wastewater between 3.5 and 9. The treatment method provided by the invention has the advantages of applicability to silicate wastewater discharged in various processes, capability of thoroughly solving the problem that SiO2 in the silicon-containing wastewater is easy to gel, mild using conditions, simple operation process and capability of enabling treated wastewater to reach discharge standards.

Description

technical field [0001] The invention relates to a method for treating silicon-containing wastewater. Background technique [0002] At present, in the process of catalyst production in the petrochemical industry, a large amount of silicon-containing wastewater with high pH (pH value above 11) is produced in the molecular sieve workshop, and the silicate contained therein is represented by SiO 2 The meter can be as high as 2.0% to 4.0%, and it is quite stable. These wastewaters are generally alkaline. If they are directly discharged into natural water bodies, as the pH decreases, the SiO 2 Gel or flocs sink out to form white water, pollute water bodies, and block waterways. If the soluble SiO in these wastewaters is not 2 Thorough treatment means discharge, which will cause immeasurable pollution and damage to the environment. [0003] There is no relevant report abroad on the treatment of this kind of wastewater. Larger domestic manufacturers use the method of neutraliza...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C02F9/04C02F1/52C02F1/66
Inventor 张莉马欣张利强李本高
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap