A method for improving the flux of pig raising wastewater pretreated by ultrafiltration membrane method

A pretreatment and ultrafiltration membrane technology, which is applied in the field of livestock and poultry breeding waste treatment, can solve the problems of high dosage of iron-based coagulants, decreased flux of ultrafiltration membranes, and high residual iron salts. Coagulation and sedimentation effect, fast floc speed, and good settling performance

Inactive Publication Date: 2020-06-02
嘉兴悟净环保科技有限公司
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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 pig raising wastewater, to achieve the ideal coagulation effect, the dosage of iron-based coagulant is relatively high, resulting in a relatively high residual iron salt in the coagulation effluent. On the one hand This results in a darker effluent color; on the other hand, the further hydrolysis of residual iron salts in the effluent produces colloids that will cause a substantial decrease in the flux of the subsequent ultrafiltration membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Coagulation pretreatment of pig wastewater: Prepare pig wastewater and ferric chloride according to the ratio of volume and mass: 1000ml: 1.2g; first add coagulant and stir quickly for 1 minute, then slowly After stirring for 2 minutes, let it stand for 30 minutes, and the supernatant is ready for use;

[0027] (2) Complexation and stabilization treatment of residual iron salts: Prepare the supernatant of step (1) and citric acid according to the ratio of volume and mass: 1000 ml: 1.0 g; add citric acid and stir quickly for 30 seconds, let stand 30 minutes, water sample for later use;

[0028] (3) Ultrafiltration treatment of effluent after coagulation: pass the water sample in step (2) through an ultrafiltration membrane module with a pore size of 50nm for ultrafiltration treatment, and the membrane area is 10m 2 , the operating pressure of the membrane module is 0.2MPa, and the water flux per hour is 1.0m 3 . As a comparison, the supernatant from step (1) was s...

Embodiment 2

[0030] (1) Coagulation pretreatment of pig raising wastewater: Prepare the raw materials of pig raising wastewater and polyferric sulfate according to the ratio of volume and mass: 1000ml: 3.6g; first add coagulant and stir quickly for 1 minute, then stir slowly After 2 minutes, let it stand for 30 minutes, and the supernatant is ready for use;

[0031] (2) Complexation and stabilization treatment of residual iron salts: Prepare the supernatant of step (1) and EDTA according to the ratio of volume and mass: 1000 ml: 0.1 g; add EDTA and stir quickly for 30 seconds, and let stand for 30 minutes , the water sample is ready for use;

[0032] (3) Ultrafiltration treatment of effluent after coagulation: pass the water sample in step (2) through an ultrafiltration membrane module with a pore size of 50nm for ultrafiltration treatment, and the membrane area is 10m 2 , the operating pressure of the membrane module is 0.3MPa, and the water flux per hour is 1.5m 3 . As a comparison, t...

Embodiment 3

[0034] (1) Coagulation pretreatment of pig raising waste water: prepare raw materials with the ratio of pig raising waste water, ferric chloride and polyferric sulfate in volume and mass: 1000 ml: 1.2 g: 1.2 g; first add the coagulant and quickly Stir for 1 minute, then stir slowly for 2 minutes, let stand for 30 minutes, and use the supernatant for later use;

[0035] (2) Complexation and stabilization treatment of residual iron salts: Prepare the supernatant of step (1) and oxalic acid according to the ratio of volume and mass: 1000 ml: 0.5 g; add oxalic acid and stir quickly for 30 seconds, and let stand for 30 minutes , the water sample is ready for use;

[0036] (3) Ultrafiltration treatment of effluent after coagulation: pass the water sample in step (2) through an ultrafiltration membrane module with a pore size of 50nm for ultrafiltration treatment, and the membrane area is 10m 2 , the operating pressure of the membrane module is 0.4MPa, and the water flux per hour is...

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Abstract

The invention discloses a method for increasing the flux of swine wastewater treated through an ultrafiltration membrane method, and belongs to the technical field of treatment of livestock and poultry breeding waste. The method comprises the following steps that 1, the swine wastewater is subjected to coagulation pretreatment; 2, residual molysite is subjected to stabilizing treatment; 3, effluent obtained after coagulation is subjected to ultrafiltration treatment. The method has the advantages that after a ferric coagulant is added into the swine wastewater, the floc forming speed is high, the settling property is good, the winter low-temperature treatment effect is good, the adaptability to the water quality of input water is high, and a good coagulating sedimentation effect can be achieved without adding polyacrylamide (PAM) or other coagulant aids; due to the fact that a complexing stabilizing agent is added, residual molysite in the effluent obtained after coagulation can be completely complexed, and it is avoided that ferric iron in the effluent is hydrolyzed to generate colloid to be separated out, and consequently subsequent ultrafiltration film operation is influenced. Compared with the mode that ultrafiltration treatment is carried out without adding the complexing stabilizing agent, the ultrafiltration film flux obtained after complexing and stabilizing treatment is higher.

Description

technical field [0001] The invention relates to the technical field of treatment of livestock and poultry breeding waste, in particular to a method for improving the flux of pig-raising wastewater pretreated by an ultrafiltration membrane method. Background technique [0002] Pig wastewater is a high-concentration organic wastewater with high ammonia nitrogen, and the content of suspended solids (SS) in the wastewater is also high. Pig wastewater is rich in biologically active substances such as nitrogen, phosphorus, potassium, amino acids, and humic acid. It is a good organic fertilizer. It can be used as an organic fertilizer to realize the secondary utilization of resources. However, there are often problems such as insufficient absorption capacity of nearby farmland, small amount of utilization in winter, and high cost of long-distance transportation. Low. Therefore, in recent years, the high-value utilization technology of membrane concentration of pig wastewater has ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/44C02F1/52C02F103/20
CPCC02F1/444C02F1/52C02F1/5245C02F2103/20
Inventor 肖华张鸣朱晓明
Owner 嘉兴悟净环保科技有限公司
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