The method of treating slaughter wastewater by cstr-coagulation sedimentation-a/o technology

A technology for slaughter wastewater and technical treatment, applied in the direction of flocculation/sedimentation water/sewage treatment, sedimentation treatment, water/sewage treatment, etc.

Active Publication Date: 2020-09-29
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The direct discharge of such low-concentration wastewater or the reuse of reclaimed water has always been a problem that has not been well solved in large-scale slaughter wastewater treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for processing slaughter wastewater using CSTR-coagulation sedimentation-A / O technology, comprising the following steps:

[0023] The slaughter wastewater is transported into the sump, and then transported to the complete mixed anaerobic digester CSTR through the shear pump, and undergoes anaerobic digestion in the CSTR reactor, and the generated biogas is recycled, and the water from the CSTR reactor flows into the regulating tank by itself; Then it is lifted to the coagulation sedimentation tank by the lift pump, and the coagulant is added for solid-liquid separation. The effluent of the coagulation sedimentation tank flows into the A / O reaction tank by itself, and the effluent after the reaction flows into the secondary settling tank by itself, and is carried out in the secondary settling tank. Sludge and water are separated, and the supernatant enters the disinfection tank and is discharged up to the standard after disinfection to realize the treatment of sl...

Embodiment 2

[0027] The amount of the coagulant added is 300 mg per 1 L of slaughter wastewater; the coagulant comprises the following raw materials in parts by weight: 25 parts of modified chitosan, 10 parts of modified bentonite, 5 parts of polyacrylamide, 3 parts Polyoxyethylene trimethylammonium chloride, 3 parts polyaluminum ferric silicate.

[0028] All the other processing methods and parameters are identical with those in Example 1;

[0029] Adopt this embodiment to carry out slaughter wastewater treatment, the original slaughter wastewater COD cr The average concentration of COD is 5800mg / L. After treatment, the average concentration of COD in the effluent is 77.6mg / L. The average concentration of SS in the suspension of raw slaughter wastewater is 3300mg / L. After treatment, the average concentration of SS in the effluent is 50.2mg / L. heavy metal Cd 2+ 、Cu 2+, Mn 2+ The removal rates were 87.4%, 85.3% and 86.5%, respectively.

Embodiment 3

[0031] The amount of the coagulant added is 250 mg per 1 L of slaughter wastewater; the coagulant comprises the following raw materials in parts by weight: 20 parts of modified chitosan, 8 parts of modified bentonite, 4 parts of polyacrylamide, 2 parts Polyoxyethylene trimethylammonium chloride, 2 parts polyaluminum ferric silicate.

[0032] All the other processing methods and parameters are identical to those in Example 1.

[0033] Adopt this embodiment to carry out slaughter wastewater treatment, the original slaughter wastewater COD cr The average concentration is 5800mg / L. After treatment, the average concentration of COD in the effluent is 77.5mg / L; the average concentration of SS in the suspended matter of the original slaughter wastewater is 3300mg / L. After treatment, the average SS concentration in the effluent is 50.5mg / L. heavy metal Cd 2+ 、Cu 2+ , Mn 2+ The removal rates were 86.8%, 85.2% and 85.4%, respectively.

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Abstract

The invention discloses a method for treating slaughterhouse wastewater by adopting a CSTR-coagulation sedimentation-A / O technology. The method comprises the following steps: conveying the slaughterhouse wastewater into a water collecting tank, then conveying to CSTR and carrying out reaction, enabling effluent to automatically flow into a regulating tank, a coagulation sedimentation tank, an A / O reaction tank and a secondary sedimentation tank, carrying out mud-water separation in the secondary sedimentation tank, enabling supernatant to enter a disinfecting tank to be disinfected and discharged after reaching the standard, enabling partial sludge at the bottom of the sedimentation tank to reflux to an anoxic pond, discharging the rest of the sludge into a sludge concentration tank by virtue of a sludge pump, carrying out gravity concentration, dehydrating by virtue of a plate-and-frame filter press, and then transporting outward, so that treatment on the slaughterhouse wastewater is realized. By virtue of the method disclosed by the invention, the slaughterhouse wastewater can be comprehensively treated, so that content of CODcr, BOD, TSS and heavy metals in effluent obtained after the wastewater is treated is obviously lowered; meanwhile, coagulation reaction is carried out by virtue of a coagulator in the invention, heavy metals prepared from waste leather in a slaughter process are utilized for carrying out adsorption reaction, and the problem that the content ofnitrogen, phosphorus, heavy metals, feed organic matters and the like in low-concentration wastewater exceeds standard is well solved.

Description

technical field [0001] The invention relates to a method for treating slaughter wastewater, in particular to a method for treating slaughter wastewater by using CSTR-coagulation sedimentation-A / O technology. Background technique [0002] Fecal sewage from large-scale slaughterhouses belongs to high-concentration organic wastewater. Only 20% of these pollutants have been harmlessly treated, and most slaughterhouses do not have pollution treatment facilities. Many slaughterhouses discharge fecal sewage directly into canals or ponds. A small part of the sewage is used for agricultural irrigation, and some seeps into the ground, while most of the sewage is washed into the river with the rain during the flood season, seriously polluting surface water and groundwater, causing agricultural and animal husbandry problems. The water environment of the community and the Qinghai-Tibet Plateau deteriorated. [0003] Slaughter wastewater contains a large amount of organic matter, and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14B01J20/26B01J20/24C02F103/22C02F101/20
CPCB01J20/22B01J20/24B01J20/261C02F1/285C02F1/286C02F1/5236C02F1/5263C02F1/56C02F3/28C02F3/30C02F9/00C02F2001/007C02F2101/20C02F2103/22C02F2301/08C02F2303/04Y02E50/30
Inventor 王亚超林晓艳张宇张永德金勇黄英泽
Owner SOUTHWEAT UNIV OF SCI & TECH
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