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A kind of polyaluminum-zinc composite flocculant and its application

A technology of aluminum-zinc polysilicate and composite flocculant, which is used in flocculation/sedimentation water/sewage treatment, neutralization water/sewage treatment, chemical instruments and methods, etc. The problem of high preparation cost is easy to operate, the preparation method is simple, and the sedimentation performance is enhanced.

Inactive Publication Date: 2019-04-23
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention patent with the publication number CN104478051A discloses a preparation method of a polyaluminum iron silicate flocculant, which uses tetraethyl orthosilicate as a silicon source, first reacts with boiling water to form polysilicic acid, and then reacts with aluminum salt and iron Salt is mixed to prepare polyaluminum silicate iron flocculant. This invention uses boiling water to prepare polysilicic acid. The preparation process is complicated, the cost is high, and it is difficult to popularize. Moreover, after excessive iron salt is added, the decolorization effect of the flocculant will be greatly reduced; Publication No. The invention patent of CN104445236A discloses a polymeric aluminum zinc silicate flocculant and its preparation method and application. In this invention, a crosslinking agent is added to the silicate solution to adjust the pH to obtain a polysilicate solution, and then sequentially added to the solution Aluminum salt and zinc salt are used to prepare polyaluminum-zinc polysilicate flocculants. In this invention, an external cross-linking agent is required, and the dosage is relatively large, and the pH adjustment requires precision. The preparation cost is high and the process is complicated.

Method used

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  • A kind of polyaluminum-zinc composite flocculant and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Preparation of polyaluminum-zinc polysilicate flocculant

[0023] (1) Prepare a 0.4mol / L sodium silicate solution, and dilute concentrated sulfuric acid with a mass fraction of 95% into a 2mol / L dilute sulfuric acid solution;

[0024] (2) Prepare a zinc sulfate solution with a concentration of 0.2mol / L and an aluminum sulfate solution with a concentration of 0.2mol / L;

[0025] (3) Take three 1L beakers, numbered 1-3 in sequence, add 20 mL of 2mol / L dilute sulfuric acid solution, and slowly add 200ml of silicic acid dropwise to the three beakers while stirring the dilute sulfuric acid solution rapidly Sodium solution, adjust the pH of the reaction system to 4 with 2mol / L dilute sulfuric acid solution, then control the stirring speed to 100rpm (in the actual operation process, the stirring speed can be set within the range of 80-120rpm) to carry out the polymerization reaction for 30min, and then The obtained reaction solution was left to stand for activation f...

Embodiment 2

[0029] Prepare a simulated water sample with a turbidity (NTU) of 120. The preparation method is as follows: After passing the kaolin powder through a 180 mesh sieve, put it in an oven for 2 hours at 100°C, and then take an appropriate amount of dry kaolin and add it to tap water under stirring conditions. : Distilled water = 1:1 (volume ratio) water, made into a suspension with an NTU of 120, which is a simulated water sample.

[0030] Under stirring conditions, the polyaluminum-zinc-aluminum-silicate composite flocculant 1-3 obtained in Example 1 was added to the simulated water sample respectively, and the dosage was 5ml / L. First, stir rapidly at a speed of 200 r / min for 40 s. Then stir at a speed of 30 r / min for 30 min, and let it stand for 1 h.

[0031] Take the clear liquid at a distance of 2cm from the liquid surface, and measure the turbidity with a HI 93703-11 turbidimeter, and the obtained results are as follows: figure 1 shown by the attached figure 1 It can be se...

Embodiment 3

[0033]The water quality index of the biochemical effluent from a sewage treatment plant in Zhengzhou is as follows: the COD measured by the potassium dichromate method (GB11914-89) is 62 mg / L, and the total phosphorus concentration measured by the molybdate spectrophotometric method (GB11893-89) is 1.12 mg / L, suspended solids (SS) measured by gravimetric method (GB11901-89) was 18.30 mg / L.

[0034] Take 10 mL of the polyaluminum-zinc composite flocculant 1 prepared in Example 1 in a 2 L beaker, add 1 L of the effluent from the sewage treatment plant, first stir rapidly at a speed of 300 r / min for 30 s, and then Stir at a slow speed of 25 r / min for 40 minutes, and let it stand for 1.5 hours. Measure the clear liquid at a distance of 2 cm from the liquid surface. The test results showed that COD was 16mg / L, total phosphorus was 0.06mg / L, and SS was 0.37 mg / L. It can be seen that the removal rate of COD can reach 74%, the removal rate of total phosphorus can reach 95%, and the ...

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Abstract

The invention discloses an aluminum-zinc polysilicate composite flocculating agent and application thereof. Sodium silicate solution and excessive sulfuric acid are mixed with each other to prepare polysilicate solution, zinc sulfate and aluminum sulfate solution, polyacrylamide, calcium hydroxide and sodium hypochlorite are sequentially added into the polysilicate solution, and reaction is carried out to obtain the aluminum-zinc polysilicate composite flocculating agent. The aluminum-zinc polysilicate composite flocculating agent and the application have the advantages that the aluminum-zinc polysilicate composite flocculating agent can be applied to the field of water treatment, accordingly, excellent effects of removing colors, turbidity and carbon can be realized, coagulated floc particles are large, the aluminum-zinc polysilicate composite flocculating agent is high in floc settling velocity, excellent net capturing effects can be realized, and the excellent effects of removing the colors and the turbidity can be realized; raw materials for the aluminum-zinc polysilicate composite flocculating agent can come from wide sources, the aluminum-zinc polysilicate composite flocculating agent is easy to prepare and can be widely applied to the field of wastewater from dyeing and printing and papermaking industries and the like and the field of advanced municipal sewage treatment, and the like.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a polyaluminum-zinc composite flocculant and its application. Background technique [0002] With the rapid development of my country's economy and the acceleration of urbanization, the discharge of urban sewage and industrial wastewater has increased year by year. How to deal with these wastewater has become a major problem in urban construction. Flocculation is a commonly used wastewater treatment method, which occupies an important position in water treatment. In recent years, flocculation technology has developed rapidly in recent years, and more and more types of flocculants have been developed. Flocculants can be divided into organic flocculation agent, inorganic flocculant and microbial flocculant. Traditional inorganic flocculants are difficult to control the formation of hydrolysis products, while inorganic polymer flocculants can control the flocculation chemistry, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F1/76C02F1/66
CPCC02F1/5236C02F1/66C02F1/76
Inventor 刘波侯翔宇姚芳梁子孙信柏王德鹏丁新春
Owner NANJING UNIV
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