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Carbon source recycling based excess sludge treatment process

A technology for excess sludge and treatment process, applied in sludge treatment, biological sludge treatment, water/sludge/sewage treatment, etc., can solve the problem of low organic acid accumulation

Active Publication Date: 2017-10-20
SHENZHEN HAIYUAN ENERGY TECH CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to provide a residual sludge treatment process based on carbon source reuse in view of the low accumulation of organic acids in the hydrolytic acidification process in the existing sludge treatment process and the competitive inhibition of hydrolytic acidification bacteria and methane bacteria

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  • Carbon source recycling based excess sludge treatment process
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  • Carbon source recycling based excess sludge treatment process

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Embodiment Construction

[0017] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0018] In order to promote the accumulation of organic acids and promote the reuse of carbon sources, the present invention provides a residual sludge treatment process based on the reuse of carbon sources, including the following process steps:

[0019] (1) Hot alkaline pretreatment of the remaining sludge: The retrieved fresh sludge is left to stand for concentration for 24 hours and then the supernatant is removed. The properties of the fresh sludge are as follows figure 1 As shown, the concentration of SCOD is 550 mg / L and the concentration of VFAs is less than 10 mg / L. The pH value of the sludge was adjusted to 10 with 5mol / L NaOH, and it was placed in a heating device at 90°C for constant temperature heating for hot alkaline pretreatment for 2h, and stirring was continued.

[0020] (2) Acid start-up of the reactor: pump the sludge pretreated with hot alkali ...

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Abstract

The invention relates to the technical field of excess sludge anaerobic fermentation in urban sewage treatment plants and discloses a carbon source recycling based excess sludge treatment process. By thermo-alkaline pretreatment of excess sludge, sludge cells are decomposed, macromolecules such as proteins and polysaccharides are released into supernatant; then sludge hydrolytic acidification is performed, activity of acid producing microorganisms is benefited while VFAs accumulation is promoted through an acidic starting (pH=6) stage, and through an alkaline fermentation (pH=10) stage, activity of methanogens can be inhibited to avoid VFAs consumption of methanogens in a methane producing process, and an acid production effect is kept stronger than a methane production effect, so that accumulation concentration of SCOD and VFAs in hydrolytic acidification liquid is greatly increased, and a high-quality regenerated carbon source is provided for upgrading of low C / N urban sewage.

Description

Technical field [0001] The invention relates to the technical field of sludge anaerobic fermentation of urban sewage treatment plants, in particular to a residual sludge treatment process based on carbon source reuse. Background technique [0002] With the rapid development of the sewage treatment industry, more and more sludge is produced. According to the "2015-2016 Sludge Treatment Market Analysis Report", as of the end of 2015, the annual output of sludge produced in the urban sewage treatment process in my country was as high as 70 million tons. How to achieve the reduction, stabilization, recycling, and harmless treatment of sludge has become a major problem faced by urban sewage treatment plants. [0003] There is a lot of rain in southern my country, and the drainage system is mostly combined. As a result, urban sewage treatment plants generally face the problem of low carbon-nitrogen ratio of the sewage, which causes problems for the follow-up biological treatment system....

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/04C02F11/12
CPCC02F11/00C02F11/04C02F11/12C02F2209/06C02F2209/08C02F2305/06Y02E50/30
Inventor 何青曾凌君李平吴祖力朱凤霞冯涛
Owner SHENZHEN HAIYUAN ENERGY TECH CO LTD
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