Method for livestock wastewater environment value-added utilization

A technology for wastewater and livestock and poultry, which is applied in the fields of animal husbandry wastewater treatment, chemical instruments and methods, and water pollutants to avoid environmental pollution and improve the environment.

Active Publication Date: 2017-09-12
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a value-added utilization method of livestock and poultry wastewater based on microalgae cultivation and hydrothermal liquefaction, so as to solve the current problem of resource utilization of livestock and poultry wastewater nutrition

Method used

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  • Method for livestock wastewater environment value-added utilization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Chicken manure biogas slurry is clarified after flocculation and sedimentation, and then UF (ultrafiltration) membrane is used for ultrafiltration to remove suspended solids in wastewater, increase light transmittance, and then obtain filtered chicken manure biogas slurry.

[0050] The filtered chicken manure biogas slurry is diluted, wherein the filtered chicken manure biogas slurry accounts for 5-10% of the total volume of the diluted solution.

[0051] The diluted solution is placed in a microalgae culture pool, the domesticated chlorella is inoculated in the solution, and cultivated in the microalgae culture pool under light conditions.

[0052] (2) Cultivate in the microalgae culture pond to harvest chlorella when the biomass is 2g / L, adjust the pH of the water in the culture pond to 7.1 with HCl, and adjust the water content of the microalgae to 80 ± 0.2% after harvesting, which is mud shape.

[0053] (3) Take 50ml of microalgae mud and add it into a 100ml hy...

Embodiment 2

[0058] (1) The waste water from pig farm flushing manure is clarified by flocculation and sedimentation, and then the suspended matter in the waste water is removed by ultrafiltration to increase the light transmittance, and then the filtered pig farm water flushing waste water is obtained.

[0059] Diluting the filtered pig farm water for flushing manure, wherein the filtered pig farm water for flushing manure accounts for 5-6% of the total volume of the diluted solution.

[0060] The diluted solution is placed in a microalgae culture pool, the domesticated spirulina is inoculated in the solution, and cultivated in the microalgae culture pool under light conditions.

[0061] (2) Harvest the spirulina when the biomass is 3.5g / L in the microalgae culture tank, adjust the pH of the solution to 7.1 with NaOH, and adjust the water content of the microalgae to 85±0.2% after harvesting, which is muddy.

[0062] (3) Add 45ml of microalgae mud into a 100ml reaction kettle, and seal th...

Embodiment 3

[0067] (1) The vesicular manure wastewater from pig farms is clarified by flocculation and sedimentation, and then the suspended solids in the wastewater are removed by nanofiltration, and the light transmittance is increased, so as to obtain filtered vesicular manure wastewater from pig farms.

[0068] Dilute the filtered pig farm vesicle dung wastewater, wherein the filtered pig farm vesicle dung wastewater accounts for 6-7% of the total volume of the diluted solution.

[0069] The diluted solution is placed in a microalgae culture pool, the domesticated Dunaliella salina is inoculated in the solution, and cultured in the microalgae culture pool under light conditions.

[0070] (2) Harvest Dunaliella salina when the biomass is 1.2g / L in the microalgae culture tank, adjust the pH of the solution in the culture tank to 7.1 with HCl, and adjust the water content of the microalgae to 90±0.2% after harvesting, which is mud shape.

[0071] (3) Take 60ml of microalgae mud and add ...

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Abstract

The invention belongs to the technical fields of environmental protection and new energy and particularly relates to a microalgae culture and hydrothermal liquefaction based livestock wastewater value-added utilization method which comprises the following steps: 1) performing flocculating settling and filtering on livestock wastewater, placing a diluted solution in a microalgae culture pool, and inoculating domesticated microalgae to the solution; 2) performing microalgae culture; 3) performing hydrothermal liquefaction; and 4) performing liquid product separation, filtering and separating a liquid mixture product to obtain crude oil and a water-phase product, hydrothermal liquefaction wastewater is circularly used by being introduced into the microalgae culture pool in the step 2) serving as a nutrient solution for supplementing nutrient substance, such as nitrogen, phosphorus and the like; wherein the hydrothermal liquefaction wastewater is introduced into the microalgae culture pool to be mixed with the livestock wastewater, and regulating the concentrations of water quality total nitrogen TN and water quality total phosphorus TP in the microalgae culture pool to 200-1000mg / L and 20-500mg / L respectively, and repeating the steps 2)-4). According to the method, nutrient elements such as nitrogen, phosphorus and the like in the livestock wastewater can be supplemented again through the hydrothermal liquefaction wastewater so as to be recycled for 3-10 times.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and new energy, and in particular relates to a value-added utilization method of livestock and poultry wastewater based on microalgae cultivation and hydrothermal liquefaction. Background technique [0002] Livestock and poultry wastewater refers to excrement and urine produced in the process of livestock and poultry breeding, livestock and poultry house flushing wastewater, livestock and poultry manure fermentation liquid, etc. Livestock wastewater is rich in pollutants such as nitrogen, phosphorus, organic carbon and heavy metals, and a large amount of wastewater continues to be generated during the production process. If it is not dealt with in a timely and effective manner, it will pollute the environment and cause a waste of resources. [0003] There have been a large number of cases of treating wastewater (livestock and poultry wastewater, municipal sewage, mine wastewater,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32C02F101/10C02F101/16C02F101/20C02F103/20
CPCC02F3/322C02F2101/105C02F2101/16C02F2101/20C02F2103/20C02F2303/10Y02E50/30
Inventor 刘志丹王猛朱张兵王新锋李保明卢海凤张源辉
Owner CHINA AGRI UNIV
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