Pretreatment method for pig farm anaerobic digested liquid

A technology of anaerobic digestion and pretreatment, applied in the field of water treatment, can solve the problems of poor biodegradability, difficult to achieve operation effect of industrialized aerobic biodegradation process, etc., and achieve the effect of good effect, low investment and simple operation.

Inactive Publication Date: 2014-01-22
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The traditional aerobic biological treatment technology is easily affected by the quality of wastewater. The anaerobic digestion solution of pig farms has poor biodegradability and water quality characteristics of C / N inversion ratio, which makes it difficult for industrialized aerobic biodegradation process to achieve good operating results. It is particularly important to pre-treat the digestive juice with a suitable method to reduce the content of pollutants and improve the biochemical performance, so as to improve the operation effect of the biochemical treatment unit.

Method used

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  • Pretreatment method for pig farm anaerobic digested liquid

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Embodiment 1

[0018] This embodiment processes pig farm anaerobic digestate 80m 3 .

[0019] Pig farm anaerobic digestion solution original pH=7-7.5, COD concentration 2065.35mg / L, PO 4 3- -P concentration 19.75mg / L, NH 4 + -N concentration 450.22mg / L. The specific implementation steps are as follows: the anaerobic digestion solution in the biogas digester is first collected through the pipeline to the adjustment tank 1 for mixing and homogenization, and sodium carbonate solution is added to adjust the pH of the digestion solution to 9.5; the effluent flows into the reaction tank 2 by 1L : 14.25g of slag powder 1140kg evenly added to the pool after baking, grinding, compounding, baking temperature 110 ℃, baking time 5h, grinding particle size to 200 mesh, compounding ratio is 800kg slag powder: 180kg diphosphate Potassium hydrogen: 160kg magnesium sulfate, combined with the aerator set at the bottom to uniformly aerate the digestive liquid, the aeration time is 2h; the reaction effluen...

Embodiment 2

[0021] This embodiment handles pig farm anaerobic digestate 100m 3 .

[0022] Pig farm anaerobic digestion solution original pH=7-7.5, COD concentration 2065.35mg / L, PO 4 3- -P concentration 19.75mg / L, NH 4 + -N concentration 450.22mg / L. The specific implementation steps are as follows: the anaerobic digestion solution in the biogas digester is first collected through the pipeline to the adjustment tank 1 for mixing and homogenization, and sodium carbonate solution is added to adjust the pH of the digestion solution to 9.5; the effluent flows into the reaction tank 2 by 1L : The ratio of 14.25g is evenly added to the pool after baking, grinding and compounding 1425kg of slag powder, the baking temperature is 110°C, the baking time is 5h, the grinding particle size is 200 mesh, and the compounding ratio is 1000kg slag powder: 225kg diphosphate Potassium hydrogen: 200kg magnesium sulfate, combined with the aerator set at the bottom to uniformly aerate the digestive liquid, ...

Embodiment 3

[0024] This embodiment handles pig farm anaerobic digestate 50m 3 .

[0025] Pig farm anaerobic digestion solution original pH=7-7.5, COD concentration 2065.35mg / L, PO 4 3- -P concentration 19.75mg / L, NH 4 +-N concentration 450.22mg / L. The specific implementation steps are as follows: the anaerobic digestion solution in the biogas digester is first collected through the pipeline to the adjustment tank 1 for mixing and homogenization, and sodium carbonate solution is added to adjust the pH of the digestion solution to 9.5; the effluent flows into the reaction tank 2 by 1L : The ratio of 14.25g is evenly added to the pool after baking, grinding and compounding 712.5kg of slag powder, the baking temperature is 110°C, the baking time is 5h, the grinding particle size is 200 mesh, and the compounding ratio is 500kg. Slag powder: 112.5kg Potassium dihydrogen phosphate: 100kg magnesium sulfate, combined with the aerator set at the bottom to uniformly aerate the digestive liquid,...

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Abstract

The invention relates to a pretreatment method for pig farm anaerobic digested liquid. The pretreatment method comprises: homogenizing the anaerobic digested liquid via an adjusting tank, adding a sodium carbonate solution, adjusting pH to 9.5; after the effluent automatically flows into a reaction tank, uniformly adding modified compounded mineral slag into the tank according to a ratio of 1 L:14.25 g, at the same time performing aeration on the digested liquid for 2 h; after the effluent flows into a settling tank for deposition for 30 min, performing advanced treatment on deposition supernatant entering a subsequent biochemical treatment unit, lifting the lower layer sludge to a sludge tihckener for thickening, then enabling the sludge to flow back to the adjusting tank; and dewatering the thickened sludge by using a decanter centrifuge, wherein the dewatering separated liquid flows back to the adjusting tank and the dewatered slag cake is used for preparation of sustained-release organic fertilizer or a soil improving agent. According to the pretreatment method, iron ore sintered slag is taken as the adsorption precipitating agent for preparation of the matrix, and the dewatered slag cake possesses the soil-improving characteristic, and is an excellent sustained-release organic fertilizer.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for pretreatment of anaerobic digestion liquid in pig farms. Background technique [0002] In recent years, the domestic pig industry has shown a large-scale and intensive development, and the production of pigs has expanded year by year, and the resulting breeding wastewater has increased rapidly. The owners of pig farms in my country mostly use anaerobic fermentation to produce biogas to treat aquaculture wastewater. The digestive juice produced by anaerobic fermentation of pig farm wastewater is relatively complex in composition, high in organic pollutants, and rich in N and P elements. According to data, The COD value of the digestive juice can reach 1138-12160mg / L, the content of ammonia nitrogen and total phosphorus can reach 296-707mg / L and 30-277mg / L respectively. If it is not treated effectively and discharged randomly, it will inevitably caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/28C02F1/52C02F1/66C02F1/20C02F103/20
Inventor 张文艺郑泽鑫刘芳冯国勇陈晶
Owner CHANGZHOU UNIV
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