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Method for preparing polyaluminium chloride ferric flocculant by using municipal sewage sludge

A technology of polyaluminum chloride and municipal sludge, applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc., can solve the problems of high energy consumption in incineration, secondary pollution, environmental pollution, etc. Achieve the effect of realizing resource utilization and comprehensive utilization, reducing processing cost and production cost

Inactive Publication Date: 2013-07-10
广东慧信环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Landfill covers a large area, and improper disposal can easily cause secondary pollution; incineration consumes a lot of energy, costs, and invests; although the cost of sludge for agriculture is very low, land application of sludge will cause the accumulation of heavy metals in the soil, which can cause Pollution of wheat, corn, rice, etc., heavy metals in sludge, pathogenic bacteria and other organic pollutants can also spread to poultry and humans through crops
The above sludge treatment and disposal methods not only cause waste of resources and energy, but also cause environmental pollution and endanger human health

Method used

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  • Method for preparing polyaluminium chloride ferric flocculant by using municipal sewage sludge
  • Method for preparing polyaluminium chloride ferric flocculant by using municipal sewage sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Put the sludge from the urban sewage treatment plant into the hydrothermal reactor, add hydrogen peroxide with a concentration of 30% (mass percentage), the amount of hydrogen peroxide added is 0.05-0.06g / L, and the Under pressure, heat to 135-140°C, keep the temperature for hydrothermal reaction for 3 hours; after the reaction, let it stand for 30 minutes, wait for solid-liquid separation, and filter to obtain filter residue; weigh 100g of filter residue, add 350mL industrial hydrochloric acid for acid dissolution, at 90°C After fully acid-dissolving, add 200mL of water and 3mL of iron-containing hydrochloric acid waste liquid with an iron content of 1% to 20%, raise the temperature to 80°C, add 6.8g of calcium aluminate powder, 0.03g of sodium chlorate, 0.1g of sodium sulfide was reacted at 95°C for 2.5 hours; cooled and aged for 24 hours, and filtered to obtain a reddish-brown transparent liquid product 1.

Embodiment 2

[0032] Put the sludge from the urban sewage treatment plant into the hydrothermal reactor, add hydrogen peroxide with a concentration of 30% (mass percentage), the amount of hydrogen peroxide added is 0.06-0.07g / L, and the Under pressure, heat to 145-150°C, keep the temperature for hydrothermal reaction for 2.5 hours; after the reaction, let it stand for 30 minutes, wait for solid-liquid separation, and filter to obtain filter residue; weigh 100g of filter residue, add 380mL industrial hydrochloric acid for acid dissolution, and dissolve at 95 React at ℃ for 1 hour; after fully acid-dissolving, add 250mL of water and 4mL of iron-containing hydrochloric acid waste liquid with an iron content of 1% to 20%, raise the temperature to 75℃, add 8.7g of calcium aluminate powder, 0.05g of sodium chlorate, 0.2g of sodium sulfide was reacted at 98°C for 2.5 hours; cooled and aged for 20 hours, and filtered to obtain reddish-brown transparent liquid product 2.

Embodiment 3

[0034] Put the sludge from the urban sewage treatment plant into the hydrothermal reactor, add hydrogen peroxide with a concentration of 30% (mass percentage), the amount of hydrogen peroxide added is 0.04-0.05g / L, and the Under pressure, heat to 135-140°C, keep the temperature for hydrothermal reaction for 4 hours; after the reaction, let it stand for 60 minutes, wait for solid-liquid separation, and filter to obtain filter residue; weigh 100g of filter residue, add 300mL industrial hydrochloric acid for acid dissolution, at 95°C After fully acid-dissolving, add 230mL of water and 2mL of iron-containing hydrochloric acid waste liquid with an iron content of 1% to 20%, raise the temperature to 80°C, add 5g of calcium aluminate powder, 0.05g of sodium chlorate, 0.1 g sodium sulfide, react at 98°C for 3 hours; cool, age for 24 hours, and filter to obtain reddish-brown transparent liquid product 3.

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Abstract

The invention discloses a method for preparing polyaluminium chloride ferric flocculant by using municipal sewage sludge, which is characterized by comprising the following steps of: putting the municipal sewage sludge into a hydrothermal reactor, adding an aqueous hydrogen peroxide solution, heating to 120-150 DEG C under the pressure of 0.8 to 1.2Mpa, keeping warm and reacting for 2 to 4h; after the reaction is ended, standing still for solid-liquid separation, and filtering to obtain filter residue; adding industrial hydrochloric acid in the filter residue, and reacting for 1-2h in the temperature of 90-95 DEG C; after acid is fully dissolved, adding water for dilution, adding iron-containing hydrochloric acid, uniformly stirring, raising temperature to 75-80 DEG C, adding calcium aluminate powder, sodium chlorate and sodium sulfide, reacting for 2-3 h at the temperature of 95 to 100 DEG C; and cooling, ageing and filtering to obtain a reddish brown transparent liquid product. The method has the advantages of carrying out effective resource recovery treatment on the municipal sewage sludge on the one hand and cheaply preparing the polyaluminium chloride ferric flocculant as an efficient water treatment agent on the other hand.

Description

technical field [0001] The invention relates to the technical field of sludge resource treatment and polyaluminum chloride production, in particular to a method for preparing a polyaluminum chloride flocculant from municipal sludge. Background technique [0002] Municipal sewage plant sludge refers to the solid, semi-solid and liquid discards produced by sewage treatment. It is an extremely complex heterogeneous body composed of organic debris, bacteria, inorganic particles, colloids, etc.; Concentration of heavy metals, organic matter and nutrients. With the rapid development of my country's urbanization and the increasing environmental quality standards, the sewage treatment rate and treatment degree are also increasing and deepening, the output of sludge is also increasing, and the secondary pollution caused by sludge is also increasing. Seriously, the treatment and disposal of sludge has become a new difficulty and challenge in the comprehensive environmental management ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F11/00
Inventor 谭铭卓蒋志飞区叶秀
Owner 广东慧信环保有限公司
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