Process for efficiently pretreating biogas slurry

A technology of pretreatment and biogas slurry, applied in the field of livestock and poultry breeding waste treatment, can solve the problems of high dosage of flocculant, difficult to remove SS, unacceptable cost, etc., and achieve good flocculation and sedimentation effect and floc speed. Fast, adaptable effects

Inactive Publication Date: 2017-03-08
ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high content of SS in biogas slurry, it is difficult to effectively remove SS by using a conventional single flocculant. To achieve the ideal flocculation and sedimentation effect, the dosage of flocculant is relatively high, and the cost is unacceptable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Composite flocculant preparation: fully stir polyferric chloride and ferric sulfate according to the volume and mass ratio of 100ml: 20g, and prepare the materials;

[0022] (2) Flocculation of biogas slurry: Prepare the biogas slurry and the composite flocculant according to the volume ratio of 1000:1; add the flocculant and stir at 300rpm for 2 minutes, and the mixed solution is ready for use;

[0023] (3) Coagulation of the mixed solution: prepare the mixed solution in step (2) and polyacrylamide according to the ratio of volume and mass: 1000 ml: 0.01 g; add the coagulation aid and stir quickly for 30 seconds, then stir at 50 rpm After 10 minutes, the mixture is ready for use;

[0024] (4) Precipitation of the mixed solution: The mixed solution in step (3) was left to settle for 0.5 hours to obtain the supernatant, and the SS was reduced from 2000mg / L of raw water to 200mg / L.

Embodiment 2

[0026] (1) Composite flocculant preparation: fully mix polyferric chloride and ferric sulfate according to the volume and mass ratio of 100ml: 10g, and prepare the materials;

[0027] (2) Flocculation of biogas slurry: Prepare the biogas slurry and composite flocculant according to the volume ratio of 1000:3; add the flocculant and stir at 400rpm for 2 minutes, and the mixed solution is ready for use;

[0028] (3) Coagulation of the mixed solution: prepare the mixed solution in step (2) and polyacrylamide according to the ratio of volume and mass: 1000 ml: 0.02 g; add coagulant and stir quickly for 30 seconds, then stir at 75 rpm After 10 minutes, the mixture is ready for use;

[0029] (4) Precipitation of the mixed solution: The mixed solution in step (3) was left to settle for 1.0 hour to obtain the supernatant, and the SS was reduced from 1000mg / L of raw water to 50mg / L.

Embodiment 3

[0031] (1) Composite flocculant preparation: fully mix polyferric chloride and ferric sulfate according to the volume and mass ratio of 100 ml: 30 g, and prepare the materials;

[0032] (2) Flocculation of biogas slurry: Prepare the biogas slurry and the composite flocculant according to the volume ratio of 1000:5; add the flocculant and stir at 500rpm for 2 minutes, and the mixed solution is ready for use;

[0033] (3) Coagulation of the mixed solution: prepare the mixed solution in step (2) and polyacrylamide according to the ratio of volume and mass: 1000 ml: 0.04 g; add coagulant and stir quickly for 30 seconds, then stir at 100 rpm After 10 minutes, the mixture is ready for use;

[0034] (4) Precipitation of the mixed solution: The mixed solution in step (3) was left to settle for 2 hours to obtain the supernatant, and the SS was reduced from 500 mg / L of raw water to 5 mg / L.

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Abstract

The invention discloses a process for efficiently pretreating biogas slurry. The process includes steps of (1), preparing the biogas slurry and composite flocculants according to a volume proportion of 1000:1-1000:5 and flocculating the biogas slurry; (2), preparing mixed liquid obtained at the step (1) and coagulant aids according to a volume and mass proportion of 1000 milliliters:0.01-0.04 gram and coagulating the mixed liquid; (3), allowing mixed liquid obtained at the step (2) to stand still and settling the mixed liquid for 0.5-2.0 hours to obtain supernatant. The process has the advantages that the composite coagulants are added into the biogas slurry, accordingly, floc can be formed at a high speed and is good in settling property and high in inlet water quality adaptability, and excellent flocculation and settling effects can be realized by only the added trace PAM (polyacrylamide) coagulant aids; the process which includes pretreating the biogas slurry and then carrying out ultra-filtration treatment on the biogas slurry is high in membrane flux as compared with methods for directly carrying out ultra-filtration treatment without flocculation and settling.

Description

technical field [0001] The invention relates to the technical field of treatment of livestock and poultry breeding waste, in particular to the pretreatment technology of biogas slurry. Background technique [0002] Biogas slurry belongs to high-concentration organic wastewater, and the content of suspended solids (SS) in biogas slurry is also high. In recent years, the high-value utilization technology of membrane concentration of biogas slurry has attracted more and more attention. However, due to the high content of SS in the biogas slurry, if the membrane concentration is carried out directly without effective pretreatment, serious membrane fouling will be caused. Therefore, efficient pretreatment must be carried out to remove SS before membrane concentration. [0003] The flocculation and sedimentation method refers to the method that the suspended particles in the wastewater are aggregated and formed into larger flocs by adding a flocculant to settle and remove them. ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/20
CPCC02F1/5236C02F1/56C02F2001/007C02F2103/20
Inventor 沈阿林安文浩奚辉肖华
Owner ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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