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Multi-stage treatment process for kitchen sewage

A technology for treating process and sewage, which is applied in biological water/sewage treatment, water/sludge/sewage treatment, anaerobic digestion treatment, etc. It can solve the problems of sewage treatment process that is difficult to meet the discharge standards, the biochemical treatment system collapses, and the treatment effect is unstable to avoid acid inhibition, reduce the concentration of organic matter, and improve energy utilization

Inactive Publication Date: 2020-05-15
甘肃朴门生态管理咨询有限公司
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  • Claims
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AI Technical Summary

Problems solved by technology

[0002] Kitchen sewage belongs to high-concentration organic wastewater, which has the characteristics of high oil content, high SS content, high COD, and complex physical and chemical properties. Conventional sewage treatment processes are difficult to achieve discharge standards. High oil content, high SS, and high NH3-N will cause a huge load impact on domestic sewage treatment plants, leading to the collapse of the biochemical treatment system. Therefore, how to reasonably treat kitchen sewage and achieve standard discharge is a constraint on the development of the kitchen waste treatment industry. key technical
[0003] At present, domestic kitchen waste treatment projects mostly adopt primary anaerobic fermentation + biochemical treatment (A / O or membrane treatment) for kitchen sewage treatment, which generally has high investment, operation and maintenance costs, unstable treatment effects, inability to scale up applications, and difficult Technical bottlenecks such as emission standards

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0042] A multi-stage treatment process for kitchen sewage, comprising the following specific steps:

[0043] (1) The kitchen sewage is pretreated by the front-end machine to remove the kitchen waste, and enters the regulating tank for stirring and homogenizing the sewage, and separates the three phases of solid, liquid and oil, and the temperature of the sewage in the regulating tank is 58°C;

[0044] (2) The sewage treated by the regulating tank enters the first-level anaerobic high-temperature fermentation tank for high-temperature anaerobic fermentation. The temperature of the first-level anaerobic high-temperature fermentation tank is controlled at 50-58 ° C, and the hydraulic retention time is about 20 days. The treatment produces biogas, The biogas is dehydrated through the gas-water separator and collected by the biogas flame arrester in turn;

[0045] (3) The sewage treated by the first-level anaerobic high-temperature fermentation tank enters the sedimentation tank fo...

Embodiment 2

[0052] On the basis of Example 1, the temperature of the sewage in the regulating tank before the primary anaerobic is 62°C; the temperature of the primary anaerobic high-temperature fermentation tank is controlled at 50-58°C, and the hydraulic retention time is 15d; The treatment temperature of the fermenter is controlled at 30-38°C, and the hydraulic retention time is 15d; the second-level medium-temperature anaerobic fermenter is added with suspended biological filler, and the filling volume of the filler is 1 / 3 of the fermenter volume; when performing A / O biochemical treatment In Pond A for denitrification and denitrification, the temperature is controlled at 20-40°C, the DO content is controlled to be less than 0.5mg / l, and the residence time is 4d; then it enters the O pool for nitrification reaction, and the temperature is controlled at 20-30°C; Fiber soft filler, at the same time put into sludge to domesticate and cultivate into activated sludge, form an aerobic contact...

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Abstract

The invention discloses a kitchen sewage multi-stage treatment process, and belongs to the technical field of sewage treatment. The treatment process comprises the following steps: performing three-phase separation in a regulating tank; carrying out primary anaerobic high-temperature fermentation; carrying out secondary anaerobic medium-temperature fermentation; precipitating in a precipitation tank; performing a normal-temperature biochemical treatment in a biochemical pool; performing a sedimentation treatment in a secondary sedimentation tank; and discharging processed water into a clean water tank. The heat in the sewage treatment front process is fully utilized; energy is fully and efficiently utilized in a gradient mode, organic matters in sewage are degraded step by step, and the process can adapt to the characteristics of low pH, high SS, high COD, high oil content and the like of kitchen sewage, has the characteristics of high energy utilization rate, high biogas yield, high COD removal rate, stable treatment effect, low operation and maintenance cost and the like, can realize up-to-standard discharge of the kitchen sewage, and is suitable for popularization and application in the field of kitchen sewage treatment.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a multi-stage treatment process for kitchen sewage. Background technique [0002] Kitchen sewage belongs to high-concentration organic wastewater, which has the characteristics of high oil content, high SS content, high COD, and complex physical and chemical properties. It is difficult to achieve standard discharge by conventional sewage treatment processes. High oil content, high SS, and high NH3-N will cause a huge load impact on the domestic sewage treatment plant, leading to the collapse of the biochemical treatment system. Therefore, how to reasonably treat kitchen sewage and achieve standard discharge is restricting the development of the kitchen waste treatment industry. technical key. [0003] At present, domestic kitchen waste treatment projects mostly adopt primary anaerobic fermentation + biochemical treatment (A / O or membrane treatment) for kitchen sewage tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F3/30C02F3/28
CPCC02F3/286C02F3/30C02F3/34Y02E50/30
Inventor 谭业琴宝林兰鸿韩杰荣俞钟陆
Owner 甘肃朴门生态管理咨询有限公司
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