Method for treating cow dung fermented biogas slurry with combined ozone and flocculation

A flocculation and cow dung technology, which is applied in the field of pretreatment of cow dung fermentation biogas slurry, can solve the problems of poor biodegradability and high solid colloid content, and achieve the effects of short reaction time, reduced oxidation cost and enhanced effect.

Active Publication Date: 2019-04-26
黑龙江翰恒环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of high solid colloid content and poor biodegradability in the existing cow dung fermentation biogas slurry, and to provide a method for combined treatment of cow dung fermentation biogas slurry with ozone flocculation

Method used

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  • Method for treating cow dung fermented biogas slurry with combined ozone and flocculation

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specific Embodiment approach 1

[0010] Specific implementation mode one: this implementation mode is a kind of method of ozone flocculation combination treatment cow dung fermentation biogas liquor, specifically is finished according to the following steps:

[0011] Ozone oxidation treatment is first performed on the fermented cow dung biogas slurry to obtain the oxidized cow dung fermented biogas slurry, and then flocculation and sedimentation treatment is performed on the oxidized cow dung fermented biogas slurry to obtain the treated cow dung fermented biogas slurry.

specific Embodiment approach 2

[0012] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the specific process of the ozone oxidation treatment is as follows: the form of aeration is used to inject ozone into the cow dung fermentation biogas slurry, and the rate of ozone injection is 2g / h ~2.4g / h·L, aeration time 35min~45min, the mass ratio of the total amount of ozone added to the COD in the cow dung fermentation biogas slurry is (0.3~0.4):1. Others are the same as the first embodiment.

specific Embodiment approach 3

[0013] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the pH in the ozone oxidation treatment process is 7.5-8. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for treating cow dung fermented biogas slurry with combined ozone and flocculation, relates to a pretreatment method of cow dung fermented biogas slurry, and aims to solve the problem that conventional cow dung fermented biogas slurry has a high solid colloid content and poor biodegradability. The method comprises the following steps: firstly, carrying out ozone oxidation treatment on cow dung fermented biogas slurry to obtain oxidized cow dung fermented biogas slurry, and then carrying out flocculent precipitation treatment on the cow dung fermented biogas slurry to obtain treated cow dung fermented biogas slurry. The method has the advantages that the biodegradability of the cow dung fermented biogas slurry is improved, and permineralization is avoided. The dosage of ozone is reduced, the reaction time is short, the oxidation cost is lowered, and the operation cost is also saved. A flocculation dosing step is added, pollutants generated after oxidation can be removed through flocculation, the effect can be intensified, and the overall removal effect of organic matters can be improved. The method is mainly used for treating cow dung fermented biogas slurry.

Description

technical field [0001] The invention relates to a pretreatment method of cow dung fermentation biogas liquid. Background technique [0002] Farm biogas projects are widely used in my country as livestock and poultry manure treatment and energy recovery technology. The treatment of these feces and sewage through biogas projects can not only reduce environmental pollution, but also provide clean energy—biogas. Therefore, biogas projects have been rapidly developed and promoted. The ecological model of "raising one marsh and one irrigated" has been widely adopted, and more and more people pay more and more attention to it. After anaerobic fermentation, biogas residue can be used as organic fertilizer and returned to the soil for utilization. However, biogas slurry is used as a liquid, with large volume, strong fluidity and easy to block equipment. It has become a typical agricultural pollutant and has brought huge impact and pressure on the environment. If not handled properly, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/30
CPCC02F1/5236C02F1/78C02F2101/30
Inventor 高大文张明慧
Owner 黑龙江翰恒环保科技有限公司
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