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Process for preparing water glass from acid separation filtrate

A water glass and filtrate technology, applied in biochemical equipment and methods, chemical instruments and methods, silicates, etc., can solve the problems of low purity of filtrate, affecting discharge and reuse, and long time required.

Inactive Publication Date: 2006-10-04
SHANDONG TRALIN PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The COD of the liquid obtained by this solid-liquid separation method is still relatively high, which affects direct discharge and reuse, and the efficiency of solid sedimentation is not ideal, generally takes a long time, resulting in increased production costs; at the same time, once the sedimentation time is shortened , the residual lignin and other impurities are not removed completely, which will cause the filtrate entering the next stage to have a lower purity, which will affect the production of subsequent products

Method used

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  • Process for preparing water glass from acid separation filtrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] After culturing Antrodia sinuosa Fr. CFCC 7005 on agar medium at 26°C, add it to the acid precipitation filtrate, let it stand at room temperature for 40 hours, add liquid water glass with 3% weight of the filtrate as a curing agent , so that the pH of the filtrate is 7.5, settle evenly for 10 hours, separate the supernatant, dry the precipitate to a moisture content of 28%, mix it with quartz sand evenly, and make the SiO 2 with Na 2 The molar ratio of O is 3.4, and it is calcined in a calciner to obtain solid water glass.

[0015] The COD of the separated supernatant was 119.5mg / L.

Embodiment 2

[0017] After culturing Antrodia sinuosa Fr. CFCC 7005 on agar medium at 28°C, add it to the acid precipitation filtrate, let it stand at room temperature for 20 hours, add 0.3% liquid water glass by weight of the filtrate as a curing agent , so that the pH of the filtrate is 7.8, settle evenly for 5 hours, separate the supernatant, dry the precipitated part to a moisture content of 15%, mix it with quartz sand, and make the SiO 2 with Na 2 The molar ratio of O is 2.5, and it is calcined in a calciner to obtain solid water glass.

[0018] The COD of the separated supernatant was 162.3mg / L.

Embodiment 3

[0020] After culturing Antrodia sinuosa Fr. CFCC 7005 on agar medium at 28°C, add it to the acid precipitation filtrate, let it stand at room temperature for 30 hours, add 0.1% liquid water glass by weight of the filtrate as a curing agent , make the filtrate pH value 7.5, settle evenly for 5.5 hours, separate the supernatant, dry the precipitated part to a moisture content of 10%, mix it with quartz sand evenly, and make the SiO 2 with Na 2 The molar ratio of O is 3.0, and it is calcined in a calciner to obtain solid water glass.

[0021] The COD of the separated supernatant was 114.1mg / L.

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Abstract

The process of preparing water glass with acid separated filtrate includes: culturing antrodia CFCC7005 in agar at 26-28 deg.c, adding the bacteria into acid separated filtrate, letting stand at normal temperature for 20-40 hr, adding curing agent in 0.1-3 wt% of the filtrate to make pH value become 7.0-8.0, preferably 7.5-7.8, homogeneously depositing for 5-10 hr, separating supernatant, drying the deposit to water content less than 30 %, mixing with quartzite in 1-10 times and SiO2 / Na2O molar ratio of 2.5-3.4, calcining in calcining furnace to obtain solid water glass. The pre-treated filtrate has excellent deposition performance and short setting time, and the upper layer water has greatly lowered COD.

Description

Technical field: [0001] The invention relates to a method for preparing water glass from acid precipitation filtrate. Background technique: [0002] Acid analysis filtrate is the product of pulping black liquor treated by acid analysis lignin process. Although 80%-90% of organic pollution load has been removed, the filtrate still has a certain pollution load and cannot be discharged directly. Some people have conducted research on biochemical treatment of it, but due to the high operating cost and complicated treatment process, it cannot be put into production operation, and a large amount of inorganic chemical raw materials are lost with water, which is not only a waste, but also a pollution. [0003] Acid analysis filtrate belongs to high organic concentration, high salinity acid wastewater, its solid content is 8-10%, direct drying, the cost is too high, if the water in the filtrate is removed before further treatment, it will make the filtrate reprocessing and It is mor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/32C02F3/34C12N1/00
Inventor 曹光春刘玉庆杨继锋田加利申洁
Owner SHANDONG TRALIN PAPER