Method for preparing modified focculant from organic wastewater by diatomite

A technology of organic waste water and diatomite, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sewage treatment, etc., can solve problems such as high water treatment costs, environmental hazards, and secret discharge of sewage by enterprises , to achieve the effect of small environmental impact, energy saving and large floc

Inactive Publication Date: 2019-02-19
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pollution of waste water is also extremely serious in our country. National policies have also imposed many restrictions on the discharge of waste water by enterprises. However, the high cost of water treatment has caused many enterprises to secretly discharge sewage, which has brought great harm to the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for preparing organic wastewater modified flocculants with diatomite, specifically comprising the following steps:

[0021] (1) Preparation of polyaluminum iron silicate with diatomaceous earth: extracting SiO from diatomaceous earth 2 , the optimal process conditions are: m diatomite: m sodium carbonate ratio of 1:1.1, calcination temperature of 750 ℃, calcination time of 1.8 h, acid leaching with 3.0 mol / L hydrochloric acid; sol-gel water bath temperature of 94 ℃ , SiO 2 The yield is about 84%; with the extracted SiO 2 Preparation of water glass, both dry and wet; dilute the water glass with distilled water to SiO 2 The content is 3%, acidified with 20% sulfuric acid to adjust the pH to 6 for polymerization, and then add aluminum sulfate (Al 2 (SO 4 ) and iron sulfate (Fe 2 (SO 4 ) to make polyaluminum iron silicate, and then adjust the pH to 2, where n(Al):n(Fe):n(Si)=5:2:1.

[0022] (2) Preparation of CMS: Add 6g of soluble starch and 10mL of ethanol...

Embodiment 2

[0026] A method for preparing organic wastewater modified flocculants with diatomite, specifically comprising the following steps:

[0027] (1) Preparation of polyaluminum iron silicate with diatomaceous earth: extracting SiO from diatomaceous earth 2 , with extracted SiO 2 Water glass is prepared, water glass is diluted with distilled water and then added aluminum sulfate and ferric sulfate to make polyaluminum iron silicate, the specific conditions are the same as in Example 1.

[0028] (2) Preparation of CMS: Add 9g of soluble starch and 15mL of ethanol into a 250mL beaker, put it into a constant temperature heating magnetic stirring water bath, stir fully and heat to 35°C, then add 3g of NaOH solid, continue stirring for 45min, then Add 12.5ml of isopropanol solution dissolved with 7.25g of monochloroacetic acid and 3g of NaOH solid, raise the temperature to 60°C, react fully for 110min, neutralize to neutral with acetic acid solution, filter and wash with 80% ethanol sol...

Embodiment 3

[0032] A method for preparing organic wastewater modified flocculants with diatomite, specifically comprising the following steps:

[0033] (1) Preparation of polyaluminum iron silicate with diatomaceous earth: extracting SiO from diatomaceous earth 2 , with extracted SiO 2 Water glass is prepared, water glass is diluted with distilled water and then added aluminum sulfate and ferric sulfate to make polyaluminum iron silicate, the specific conditions are the same as in Example 1.

[0034] (2) Preparation of CMS: Add 12g of soluble starch and 20mL of ethanol into a 250mL beaker, put it into a constant temperature heating magnetic stirring water bath, stir fully and heat to 40°C, then add 3.5g of NaOH solid, continue stirring for 50min, Add 15ml of isopropanol solution dissolved with 7.5g of monochloroacetic acid and 3.5g of NaOH solid in turn, raise the temperature to 65°C, react fully for 120min, neutralize to neutral with acetic acid solution, filter and use 80% ethanol solu...

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PUM

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Abstract

The invention discloses a method for preparing modified flocculant from organic wastewater by diatomite and belongs to the technical field of organic wastewater treatment. The method uses diatomite asraw materials, SiO2 is extracted to synthesize sodium metasilicate pentahydrate, then polyaluminium ferric silicate is prepared, and carboxymethyl starch (CMS) is used for modifying the prepared polyaluminium ferric silicate (PAFCSC) flocculant to obtain the modified flocculant. The preparation of the flocculant by diatomite meets the requirement of comprehensive utilization of natural resources.Moreover, the demand for the flocculant is very high in China and even in the whole world, aluminum and iron flocculants occupy a large market because of good treatment effects and low cost, therefore, the preparation of the PAFCS flocculant by diatomite has great economic and social significance.

Description

technical field [0001] The invention relates to a method for preparing organic waste water modified flocculant by using diatomite, which belongs to the technical field of organic waste water treatment. Background technique [0002] Diatomaceous earth is a siliceous rock, which is mainly composed of the remains of ancient diatoms and is a biogenic siliceous sedimentary rock. Its chemical composition is SiO 2 Mainly, available SiO 2 ·nH 2 O means that the mineral composition is opal and its variants, and contains a small amount of Al2O3, Fe2O3, CaO, MgO, K2O, Na2O, P2O5 and organic matter. It is mainly distributed in China, the United States, Japan, Denmark, France and other countries. The reserves of diatomite in my country are about 320 million tons, and the prospective reserves are more than 2 billion tons. They are mainly concentrated in East China and Northeast China. There is Linjiang City in Jilin Province, which currently has the largest proven reserves in Asia. Zhe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/54
CPCC02F1/5236C02F1/5281C02F1/54C02F2001/007C02F2209/06C02F2209/08
Inventor 冯权莉张评唐光明
Owner KUNMING UNIV OF SCI & TECH
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