A treatment process for low-concentration ammonia nitrogen wastewater

Abstract

The invention discloses a technology for treating low concentration ammonia nitrogen waste water, which comprises the following steps: pretreatment, immobilized microorganism nitrification process, ion exchange treatment, detection discharge or backflow. The technology combines immobilized microorganism and ion exchange, thereby improving treatment efficiency of low concentration ammonia nitrogen, and is a new technology for thoroughly removing low concentration ammonia nitrogen. Immobilized microbe can improve density of nitrobacteria in the system, thereby efficiently converting ammonia nitrogen into nitrate nitrogen; and a double-column parallel connected ion exchange resin is used, which can be alternatively operated and regenerated, thereby minimizing usage of resin, prolonging regeneration period of resin, reducing replacing frequency with continuous and stable ammonia nitrogen removing effect, convenient operation and low operation cost; the technology is suitable for treating various low concentration ammonia nitrogen waste water.

Description

technical field

[0001] The invention relates to a wastewater treatment process, in particular to a low-concentration ammonia nitrogen wastewater treatment process. Belongs to the technical field of comprehensive environmental pollution control Background technique

[0002] With the development of industry and agriculture and the improvement of people's living standards, the amount of sewage discharge has increased year by year. At the same time, the extensive use of chemical fertilizers, pesticides and various synthetic detergents has caused nitrogen nutrients in sewage to become the main pollutant. The outstanding harm of ammonia nitrogen in water is eutrophication of water and deterioration of water quality. In addition, ammonia nitrogen and algae matter consume dissolved oxygen in water, and fish, shrimp and aquatic animals and plants will die in large numbers due to lack of oxygen. With the implementation of the "Pollutant Discharge Standards for Urban Sewage Treatment ...

Examples

Embodiment 1

[0022] Sampling of a slightly polluted source water in Guangzhou showed that the concentration of ammonia nitrogen was 12 mg / L, and the treatment of source water with low concentration of ammonia nitrogen included the following steps:

[0023] Pretreatment: Take 100 L of ammonia nitrogen wastewater and filter it with quartz sand layer to remove most of the suspended solids and some organic pollutants.

[0024] Immobilized microbial nitrification process: mix sodium alginate, nitrifying bacteria concentrate, and water in a ratio of 1.5:2:1, and then add it dropwise to 3% calcium chloride solution. After curing for 10 minutes, the polymerized gel The glue was taken out from the calcium chloride solution, washed with deionized water, and added to the immobilized microbial reactor according to the filling rate of 15%, and the dissolved oxygen concentration in the reactor was maintained at 4 mg / L. The above-mentioned pretreated wastewater is sent to the immobilized microbial reacto...

Embodiment 2

[0029] The final effluent of a sewage treatment in Jiangsu was sampled to detect that the concentration of ammonia nitrogen was 35 mg / L, and the treatment of low-concentration ammonia nitrogen wastewater included the following steps:

[0030] Pretreatment: Take 100 L of ammonia nitrogen wastewater and filter it with quartz sand layer to remove most of the suspended solids and some organic pollutants.

[0031] Immobilized microbial nitrification process: Mix sodium alginate, nitrifying bacteria concentrate, and water in a ratio of 2:3:1 and add dropwise to 3% calcium chloride solution. After curing for 5 minutes, the polymerized gel is removed from the Take it out of the calcium chloride solution, wash it with deionized water, and add it to the immobilized microbial reactor according to the filling rate of 20%, and keep the dissolved oxygen concentration in the reactor at 6mg / L. The above-mentioned pretreated wastewater is sent to the immobilized microbial reactor, and after a ...

technical field

[0001] The invention relates to a wastewater treatment process, in particular to a low-concentration ammonia nitrogen wastewater treatment process. Belongs to the technical field of comprehensive environmental pollution control Background technique

[0002] With the development of industry and agriculture and the improvement of people's living standards, the amount of sewage discharge has increased year by year. At the same time, the extensive use of chemical fertilizers, pesticides and various synthetic detergents has caused nitrogen nutrients in sewage to become the main pollutant. The outstanding harm of ammonia nitrogen in water is eutrophication of water and deterioration of water quality. In addition, ammonia nitrogen and algae matter consume dissolved oxygen in water, and fish, shrimp and aquatic animals and plants will die in large numbers due to lack of oxygen. With the implementation of the "Pollutant Discharge Standards for Urban Sewage Treatment ...

Examples

Embodiment 1

[0022] Sampling of a slightly polluted source water in Guangzhou showed that the concentration of ammonia nitrogen was 12 mg / L, and the treatment of source water with low concentration of ammonia nitrogen included the following steps:

[0023] Pretreatment: Take 100 L of ammonia nitrogen wastewater and filter it with quartz sand layer to remove most of the suspended solids and some organic pollutants.

[0024] Immobilized microbial nitrification process: mix sodium alginate, nitrifying bacteria concentrate, and water in a ratio of 1.5:2:1, and then add it dropwise to 3% calcium chloride solution. After curing for 10 minutes, the polymerized gel The glue was taken out from the calcium chloride solution, washed with deionized water, and added to the immobilized microbial reactor according to the filling rate of 15%, and the dissolved oxygen concentration in the reactor was maintained at 4 mg / L. The above-mentioned pretreated wastewater is sent to the immobilized microbial reacto...

Embodiment 2

[0029] The final effluent of a sewage treatment in Jiangsu was sampled to detect that the concentration of ammonia nitrogen was 35 mg / L, and the treatment of low-concentration ammonia nitrogen wastewater included the following steps:

[0030] Pretreatment: Take 100 L of ammonia nitrogen wastewater and filter it with quartz sand layer to remove most of the suspended solids and some organic pollutants.

[0031] Immobilized microbial nitrification process: Mix sodium alginate, nitrifying bacteria concentrate, and water in a ratio of 2:3:1 and add dropwise to 3% calcium chloride solution. After curing for 5 minutes, the polymerized gel is removed from the Take it out of the calcium chloride solution, wash it with deionized water, and add it to the immobilized microbial reactor according to the filling rate of 20%, and keep the dissolved oxygen concentration in the reactor at 6mg / L. The above-mentioned pretreated wastewater is sent to the immobilized microbial reactor, and after a ...

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