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Method for efficiently purifying biogas slurry in pig farm through composite microalgae

A technology of biogas slurry and microalgae, which is applied in the direction of microorganism-based methods, chemical instruments and methods, biochemical equipment and methods, etc., can solve the problems of difficult operation, high cost, and environmental pollution of biogas slurry, so as to improve the environment and reduce costs. Low, easy-to-operate effect

Inactive Publication Date: 2016-07-13
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for efficiently purifying pig farm biogas slurry by using composite microalgae, so as to solve the problem that a large amount of biogas slurry produced by livestock and poultry breeding is directly discharged to pollute the environment without treatment, and conventional sewage treatment methods are costly, difficult to operate, and Poor nitrogen and phosphorus removal effects, common problems that are difficult to promote

Method used

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  • Method for efficiently purifying biogas slurry in pig farm through composite microalgae
  • Method for efficiently purifying biogas slurry in pig farm through composite microalgae

Examples

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Effect test

Embodiment 1

[0020] Example 1: Treatment of pig farm biogas slurry with compound microalgae

[0021] Such as figure 1 , the present invention utilizes composite microalgae to efficiently purify pig farm biogas slurry method comprising the following steps:

[0022] 1. Biogas slurry pretreatment: The biogas slurry after anaerobic fermentation is separated by a solid-liquid separator and enters the disinfection tank at night, and is disinfected with 10% sodium hypochlorite solution (mass fraction of available chlorine> 10.0) 0.1mL / L. Then enter the adjustment pool for pH and nutrient adjustment, and the water in the adjustment pool is introduced into the seed expansion tank and the open photobiological reaction tank;

[0023] 2. Activation of microalgae: Inoculate Scenedesmus and Haematococcus into 250ml Erlenmeyer flasks filled with 200ml of BG11 medium, shake well, and culture under the conditions of temperature 25°C, light intensity 5000lux, and light-dark ratio 12:12h 5d to obtain the l...

Embodiment 2

[0029] Embodiment 2: Treatment of pig farm biogas slurry by Scenedesmus

[0030] This case is a comparative test of Case 1. Only Scenedesmus was used to treat pig farm biogas slurry, and other treatment steps were the same.

[0031] 1. Biogas slurry pretreatment: The biogas slurry after anaerobic fermentation is separated by a solid-liquid separator and enters the disinfection tank at night, and is disinfected with 10% sodium hypochlorite solution (mass fraction of available chlorine> 10.0) 0.1mL / L. Then enter the adjustment pool for pH and nutrient adjustment, and the water in the adjustment pool is introduced into the seed expansion tank and the open photobiological reaction tank;

[0032] 2. Activation of microalgae: Inoculate Scenedesmus into a 250ml Erlenmeyer flask containing 200ml of BG11 medium, shake well, and culture for 5 days under the conditions of temperature 25°C, light intensity 5000lux, light-dark ratio 12:12h to obtain logarithmic growth Stage microalgae mo...

Embodiment 3

[0038] Embodiment 3: Haematococcus treatment pig farm biogas slurry

[0039] This case is a comparative test of Case 1. Only Haematococcus was used to treat pig farm biogas slurry, and other treatment steps were the same.

[0040] 1. Biogas slurry pretreatment: The biogas slurry after anaerobic fermentation is separated by a solid-liquid separator and enters the disinfection tank at night, and is disinfected with 10% sodium hypochlorite solution (mass fraction of available chlorine> 10.0) 0.1mL / L. Then enter the adjustment pool for pH and nutrient adjustment, and the water in the adjustment pool is introduced into the seed expansion tank and the open photobiological reaction tank;

[0041] 2. Activation of microalgae: Inoculate Haematococcus into a 250ml Erlenmeyer flask containing 200ml of BG11 medium, shake well, and culture for 5 days under the conditions of temperature 25°C, light intensity 5000lux, and light-dark ratio 12:12h to obtain logarithm Growth stage microalgae ...

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Abstract

The invention relates to a method for treating waste water, in particular to a biological treatment method for efficiently purifying biogas slurry in a pig farm through composite microalgae, and belongs to the technical field of biological environmental protection.According to the method, the composite microalgae containing scenedesmus and haematococcaceae are prepared, the biogas slurry in the pig farm is treated through the composite microalgae according to the inoculation amount of 15% to 20% (by volume), the treatment temperature ranges from 24 DEG C to 26 DEG C, the pH value ranges from 7.0 to 8.0, and illumination intensity ranges from 4,000 lux to 6,000 lux.The synergistic effect of two kinds of microalgae is utilized, the defect that the treating effect of a single alga species on the biogas slurry is insufficient is overcome, then the utilization rate of organic matter, ammonia nitrogen, phosphorus and other matter in the biogas slurry in the pig farm increased through the microalgae, and therefore the treating and purifying efficiency of the composite microalgae on the biogas slurry is improved.Compared with treatment of the biogas slurry through a single alga species, the removal efficiency of the composite microalgae on ammonia nitrogen in the biogas slurry is improved by 8%, and the removal efficiency on phosphorus is improved by 15%.According to the method, the method for treating the biogas slurry is provided, the microalgae obtained after treatment can be collected and recycled, ecological treatment of the biogas slurry is achieved, and economic and social benefits are generated while the environment is improved.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a biological treatment method for efficiently purifying pig farm biogas slurry by using composite microalgae, and belongs to the technical field of biological environmental protection. Background technique [0002] With the adjustment of the agricultural industry structure and the construction of new countryside, the intensive livestock and poultry breeding industry has developed rapidly. As biogas slurry after anaerobic fermentation, the annual production of biogas slurry in my country is about 200 million tons. In fact, the biogas slurry after anaerobic digestion still contains a large amount of nitrogen, phosphorus and metals, and direct discharge will lead to eutrophication of water bodies. With the increasing emphasis on environmental protection and the strict implementation of sewage discharge standards, biogas slurry treatment and standard discharge have become important fa...

Claims

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Application Information

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IPC IPC(8): C12N1/12C02F3/32C12R1/89C02F103/20
CPCC12N1/12C02F3/32C02F2103/20
Inventor 杨春平罗乐刘红玉文珊周自力娄伟何慧军李惠茹
Owner HUNAN UNIV
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