Livestock and poultry breeding wastewater treating technology

Abstract

The invention discloses a livestock and poultry breeding wastewater treating technology and belongs to the technical field of treatment of livestock and poultry breeding waste. The method comprises the following steps of gravity sedimentation pretreatment, flocculation treatment, special ultrafiltration treatment, nanofiltration treatment, reverse osmosis treatment and aeration biological filter treatment. The membrane technology is used as the core, and a whole set of complete-process technology, which has the good separation and removal effect on organic matter, nitrogen, phosphorus and the like in livestock and poultry breeding wastewater, makes the processed waste water reach the pollution discharge standards in livestock and poultry breeding industry, and is wide in application range and suitable for livestock and poultry breeding wastewater zero discharge of various feces removal, is provided, wherein effluent can be recycled for washing hog houses, pig farm landscape water and toilets and the like.

Description

technical field

[0001] The invention relates to the technical field of livestock and poultry breeding waste treatment, in particular to a process for treating livestock and poultry breeding wastewater. Background technique

[0002] Livestock and poultry breeding wastewater has complex components, high organic matter content, high ammonia nitrogen concentration, strong odor, and high suspended solids (SS) content. At present, most of the treatment of livestock and poultry wastewater in my country still adopts the conventional process of anaerobic-aerobic combined biological treatment. Due to the high concentration of ammonia nitrogen in the wastewater and the serious imbalance of C:N:P ratio, the indicators such as ammonia nitrogen and total phosphorus in the effluent It is difficult to meet the limit requirements (ammonia nitrogen ≤ 80mg / L, total phosphorus ≤ 8.0mg / L) in the "Discharge Standard of Pollutants for Livestock and Poultry Breeding Industry" (GB18596-2001). With t...

Examples

Embodiment 1

[0052] Example 1: Gravity sedimentation-special ultrafiltration-reverse osmosis combined process

[0053] The process proceeds in the following steps:

[0054] (1) Gravity sedimentation pretreatment of pig farm wastewater with dry manure cleaning: for pig farm wastewater that adopts the dry manure cleaning process, carry out gravity sedimentation in a flat flow sedimentation tank for 1 day, and filter it through a 100-mesh stainless steel screen. serum COD Cr ≤1000mg / L, ammonia nitrogen ≤500mg / L, total phosphorus ≤20mg / L, spare;

[0055] (2) Special ultrafiltration treatment: The supernatant in step (1) is treated with special ultrafiltration technology, with a treatment capacity of 0.5m 3 / h, ultrafiltration membrane pore size 5nm, ultrafiltration membrane area 10m 2 , operating pressure 0.3MPa, effluent COD Cr ≤400mg / L, ammonia nitrogen ≤400mg / L, total phosphorus ≤2mg / L, spare;

[0056] (3) Reverse osmosis treatment: The effluent from step (2) is treated with reverse os...

Embodiment 2

[0057] Example 2: Combined process of gravity sedimentation-flocculation sedimentation-special ultrafiltration-nanofiltration-reverse osmosis

[0058] The process proceeds in the following steps:

[0059] (1) Gravity sedimentation pretreatment of wastewater from pig farms with water-washed manure: For pig farm wastewater that uses water-washed manure technology, carry out gravity sedimentation in a vertical flow sedimentation tank for 2 days, and pass through 50 and 100-mesh stainless steel sieves successively Mesh filtration, COD of supernatant Cr ≤1500mg / L, ammonia nitrogen ≤800mg / L, total phosphorus ≤30mg / L, spare;

[0060] (31) Flocculation-sedimentation treatment: The supernatant in step (1) is treated with coagulation-sedimentation integrated equipment, with a processing capacity of 1.5m 3 / h, the dosage of ferric chloride solution with a concentration of 20% is 6L / h, the dosage of polyacrylamide solution with a concentration of 0.5% is 3L / h, and the effluent COD Cr ≤...

Embodiment 3

[0064] Example 3: Gravity sedimentation - special ultrafiltration - nanofiltration - reverse osmosis - biological aerated filter combined process

[0065] The process proceeds in the following steps:

[0066] (1) Gravity sedimentation pretreatment of wastewater from pig farms soaked in manure: for pig farm wastewater that adopts the process of soaking manure, carry out gravity sedimentation in radial flow sedimentation tanks for 3 days, and filter through 20 and 50 mesh stainless steel screens successively , COD of the supernatant Cr ≤2000mg / L, ammonia nitrogen ≤1500mg / L, total phosphorus ≤50mg / L, spare;

[0067] (2) Special ultrafiltration treatment: The supernatant in step (1) is treated with special ultrafiltration technology, with a treatment capacity of 2.0m 3 / h, ultrafiltration membrane pore size 50nm, ultrafiltration membrane area 80m2 , operating pressure 0.4MPa, effluent COD Cr ≤1200mg / L, ammonia nitrogen ≤1200mg / L, total phosphorus ≤5mg / L, spare;

[0068] (41) N...

technical field

[0001] The invention relates to the technical field of livestock and poultry breeding waste treatment, in particular to a process for treating livestock and poultry breeding wastewater. Background technique

[0002] Livestock and poultry breeding wastewater has complex components, high organic matter content, high ammonia nitrogen concentration, strong odor, and high suspended solids (SS) content. At present, most of the treatment of livestock and poultry wastewater in my country still adopts the conventional process of anaerobic-aerobic combined biological treatment. Due to the high concentration of ammonia nitrogen in the wastewater and the serious imbalance of C:N:P ratio, the indicators such as ammonia nitrogen and total phosphorus in the effluent It is difficult to meet the limit requirements (ammonia nitrogen ≤ 80mg / L, total phosphorus ≤ 8.0mg / L) in the "Discharge Standard of Pollutants for Livestock and Poultry Breeding Industry" (GB18596-2001). With t...

Examples

Embodiment 1

[0052] Example 1: Gravity sedimentation-special ultrafiltration-reverse osmosis combined process

[0053] The process proceeds in the following steps:

[0054] (1) Gravity sedimentation pretreatment of pig farm wastewater with dry manure cleaning: for pig farm wastewater that adopts the dry manure cleaning process, carry out gravity sedimentation in a flat flow sedimentation tank for 1 day, and filter it through a 100-mesh stainless steel screen. serum COD Cr ≤1000mg / L, ammonia nitrogen ≤500mg / L, total phosphorus ≤20mg / L, spare;

[0055] (2) Special ultrafiltration treatment: The supernatant in step (1) is treated with special ultrafiltration technology, with a treatment capacity of 0.5m 3 / h, ultrafiltration membrane pore size 5nm, ultrafiltration membrane area 10m 2 , operating pressure 0.3MPa, effluent COD Cr ≤400mg / L, ammonia nitrogen ≤400mg / L, total phosphorus ≤2mg / L, spare;

[0056] (3) Reverse osmosis treatment: The effluent from step (2) is treated with reverse os...

Embodiment 2

[0057] Example 2: Combined process of gravity sedimentation-flocculation sedimentation-special ultrafiltration-nanofiltration-reverse osmosis

[0058] The process proceeds in the following steps:

[0059] (1) Gravity sedimentation pretreatment of wastewater from pig farms with water-washed manure: For pig farm wastewater that uses water-washed manure technology, carry out gravity sedimentation in a vertical flow sedimentation tank for 2 days, and pass through 50 and 100-mesh stainless steel sieves successively Mesh filtration, COD of supernatant Cr ≤1500mg / L, ammonia nitrogen ≤800mg / L, total phosphorus ≤30mg / L, spare;

[0060] (31) Flocculation-sedimentation treatment: The supernatant in step (1) is treated with coagulation-sedimentation integrated equipment, with a processing capacity of 1.5m 3 / h, the dosage of ferric chloride solution with a concentration of 20% is 6L / h, the dosage of polyacrylamide solution with a concentration of 0.5% is 3L / h, and the effluent COD Cr ≤...

Embodiment 3

[0064] Example 3: Gravity sedimentation - special ultrafiltration - nanofiltration - reverse osmosis - biological aerated filter combined process

[0065] The process proceeds in the following steps:

[0066] (1) Gravity sedimentation pretreatment of wastewater from pig farms soaked in manure: for pig farm wastewater that adopts the process of soaking manure, carry out gravity sedimentation in radial flow sedimentation tanks for 3 days, and filter through 20 and 50 mesh stainless steel screens successively , COD of the supernatant Cr ≤2000mg / L, ammonia nitrogen ≤1500mg / L, total phosphorus ≤50mg / L, spare;

[0067] (2) Special ultrafiltration treatment: The supernatant in step (1) is treated with special ultrafiltration technology, with a treatment capacity of 2.0m 3 / h, ultrafiltration membrane pore size 50nm, ultrafiltration membrane area 80m2 , operating pressure 0.4MPa, effluent COD Cr ≤1200mg / L, ammonia nitrogen ≤1200mg / L, total phosphorus ≤5mg / L, spare;

[0068] (41) N...