Composite additive used for wastewater treatment

A compound additive, sewage treatment technology, applied in biological water/sewage treatment, water/sludge/sewage treatment, sustainable biological treatment, etc., can solve sludge loss, effluent suspended solids exceeding the standard, and reduce the treatment capacity of sewage treatment system and other problems to achieve the effect of preventing and curbing sludge bulking, improving efficiency and maintaining a strong position

Inactive Publication Date: 2018-04-27
唐毅
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once sludge bulking occurs, its harm is extremely serious, not only causing sludge loss and effluent suspended solids (SS) to seriously exceed the standard, but also greatly reducing the processing capacity of the sewage treatment system, and it will take a long time to restore the system to normal

Method used

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  • Composite additive used for wastewater treatment
  • Composite additive used for wastewater treatment
  • Composite additive used for wastewater treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] TiO with a mass concentration of 20% 2 Sodium hexametaphosphate is added to the solution, and the amount of sodium hexametaphosphate added is TiO 2 0.1% by weight, aluminum sulfate to adjust the pH value to 9 for pre-dispersion, at 40 ° C, add TiO 2 Alumina with a mass of 0.1% was aged for 2 hours; then sodium hexametaphosphate was added again under heat preservation conditions, and the amount of sodium hexametaphosphate added was TiO 2 0.1% by weight, stir well, adjust the pH value to 5-5.5 with sulfuric acid, add TiO 2 Zirconium dioxide with a mass of 0.01% is aged for 2 hours, filtered, and baked at 105°C for 12 hours.

Embodiment 2

[0016] TiO with a mass concentration of 30% 2 Sodium hexametaphosphate is added to the solution, and the amount of sodium hexametaphosphate added is TiO 2 0.2% by weight, aluminum sulfate to adjust the pH value to 10 for pre-dispersion, at 50 ° C, add TiO 2 Alumina with a mass of 0.3% was aged for 3 hours; then sodium hexametaphosphate was added again under heat preservation conditions, and the amount of sodium hexametaphosphate added was TiO 2 0.2% by weight, stir well, adjust the pH value to 5.5 with sulfuric acid, add TiO 2 Zirconium dioxide with a mass of 0.03% is aged for 3 hours, filtered, and baked at 120°C for 24 hours.

Embodiment 3

[0018] TiO with a mass concentration of 25% 2 Sodium hexametaphosphate is added to the solution, and the amount of sodium hexametaphosphate added is TiO 2 0.15% by weight, aluminum sulfate to adjust the pH value to 9.5 for pre-dispersion, at 45 ° C, add TiO 2 Alumina with a mass of 0.2% was aged for 2.5 hours; then sodium hexametaphosphate was added again under heat preservation conditions, and the amount of sodium hexametaphosphate added was TiO 2 0.15% by weight, stir evenly, adjust the pH value to 5.2 with sulfuric acid, add TiO 2 Zirconium dioxide with a mass of 0.02% is aged for 2.5 hours, filtered, and baked at 115°C for 18 hours.

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PUM

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Abstract

The invention provides a composite additive used for wastewater treatment, which is prepared through the following steps: 1) adding a dispersant to a TiO2 solution, regulating pH value to 9-10 with aluminum sulfate to perform pre-dispersion, adding alumina accounting for 0.1-0.3% by mass of the TiO2 at 40-50 DEG C, and aging the mixture for 2-3 h; 2) adding the dispersant again under heat preservation condition, uniformly stirring the mixture, regulating pH value by H2SO4 to 5-5.5, adding zirconium dioxide accounting for 0.01-0.03% by mass of TiO2, and aging the mixture for 2-3 h; 3) filteringand drying the mixture. The composite additive is prepared through a multilayer coating process, and can wrap the tentacles of filamentous bacteria layer by layer, so that specific surface area of the filamentous bacteria is reduced greatly, and competitive advantage of the filamentous bacteria relative to zoogloea is inhibited, and the powerful status of the zoogloea in substrate competitivenessis guaranteed. The composite additive can effectively prevent and inhibit explosion of sludge expansion.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a composite additive for sewage treatment. Background technique [0002] Urban domestic sewage generally adopts activated sludge treatment process, such as A / O process is one of the commonly used ones. It is well known that the occurrence rate of sludge bulking in activated sludge treatment process is extremely high, even in developed countries in Europe and America. As high as 50 to 60%, the incidence rate of domestic sewage treatment plants in cities at all levels in my country is even higher. Once sludge bulking occurs, its harm is extremely serious, not only causing sludge loss and effluent suspended solids (SS) to seriously exceed the standard, but also greatly reducing the processing capacity of the sewage treatment system, and it will take a long time to restore the system to normal. For the sewage treatment system using the activated sludge method, th...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C02F3/12
CPCC02F3/12Y02W10/10
Inventor唐毅
Owner唐毅