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High ammonia-nitrogen wastewater treatment method

A treatment method, high ammonia nitrogen technology, applied in water/sewage treatment, flotation water/sewage treatment, neutralization water/sewage treatment, etc., can solve the problems of large floor area, high operating costs, and large investment costs. Achieve the effects of small footprint, low power consumption, and low operating costs

Inactive Publication Date: 2018-04-13
绍兴齐英膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stripping method and the steam stripping method have the problems of high investment cost and high operating cost, and there is secondary pollution at the same time
In addition, it occupies a large area and has strict requirements on the ammonia nitrogen value of wastewater

Method used

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  • High ammonia-nitrogen wastewater treatment method
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  • High ammonia-nitrogen wastewater treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The water quality information of a printing and dyeing wastewater is COD: 1859ppm, ammonia nitrogen value: 1050ppm, total nitrogen value: 1050ppm, pH is 8.9, and conductivity is 7.2ms / cm.

[0034] The wastewater is initially mixed with polymerized alumina, and then pre-reacted with polyacrylamide, so that the suspended matter in the wastewater forms a larger floc, and then it is evenly mixed with the dissolved air water in the air flotation device to form a larger floc. In the separation zone of the air flotation device, the air flocs are separated from the clear filtrate. The clear filtrate flows downstream from the outlet pipe of the air flotation device to the sand filter device. The dosages of polyaluminum chloride (PAC) and polyacrylamide (PAM) were 12.5 mg / L and 2.5 mg / L respectively, and the reflux ratio was 10.5%. After the wastewater is filtered by sand filter, bag filter and ultrafiltration membrane system, various suspended solids, microorganisms and other f...

Embodiment 2

[0039] The water quality information of a printing and dyeing wastewater is COD: 1859ppm, ammonia nitrogen value: 1050ppm, total nitrogen value: 1050ppm, pH is 8.9, and conductivity is 7.2ms / cm.

[0040]The wastewater is initially mixed with polyferric chloride, and then pre-reacted with polyacrylamide, so that the suspended solids in the wastewater form larger flocs, and then evenly mixed with the dissolved air water in the air flotation device to form larger flocs , In the separation zone of the air flotation device, the air flocs are separated from the clear filtrate. The clear filtrate flows downstream from the outlet pipe of the air flotation device to the sand filter device. The dosages of PAC and PAM were 12.5mg / L and 2.5mg / L respectively, and the reflux ratio was 10.5%. After the wastewater is filtered by sand filter, bag filter and ultrafiltration membrane system, various suspended solids, microorganisms and other fine particles in the wastewater are removed. Use li...

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Abstract

The invention discloses a high ammonia-nitrogen wastewater treatment method. Wastewater is subjected to pretreatment through an air floatation device, a sand filtration device, a microfiltration device and an ultrafiltration membrane, and then the treated wastewater enters an RANS membrane system. The high ammonia-nitrogen wastewater flows in a membrane fiber shell side, and a dilute acid serves as an absorption liquid and flows in the membrane fiber tube side in a cross-flow mode. Under an alkaline condition (the pH value is equal to 10.5-12), free ammonia molecules in the wastewater penetrate through membrane holes of a strongly hydrophobic membrane in the RANS membrane system, enter the membrane fiber tube side, and rapidly react with the acid in the tube side. After the wastewater is subjected to ammonia nitrogen removal treatment, the ammonia nitrogen value of outgoing water is reduced to 40 mg / L, and the salt content of the ammonium salt solution is 10-30%.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a treatment method for high ammonia nitrogen waste water. Background technique [0002] Ammonia nitrogen wastewater mainly comes from chemical fertilizers, coking, petrochemicals, pharmaceuticals, food, landfills, etc. A large amount of ammonia nitrogen wastewater discharges into water bodies not only causes eutrophication of water bodies, causes water body black and smelly, but also increases the difficulty and cost of water supply treatment, and even affects Harmful to people and organisms. At present, the treatment processes for ammonia nitrogen wastewater include stripping method, steam stripping method and so on. The blow-off method is a method of separation under alkaline conditions using the gas-liquid equilibrium relationship between the gas-phase concentration and the liquid-phase concentration of ammonia nitrogen. It is generally believed that the blow-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/16
CPCC02F1/001C02F1/24C02F1/44C02F1/444C02F1/5236C02F1/56C02F1/66C02F9/00C02F2101/16C02F2303/14
Inventor 李刚智锁红陈丽娜马新迎丁超
Owner 绍兴齐英膜科技有限公司
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