Deaminizing treatment method of medium-concentration and low-concentration ammonia-nitrogen wastewater under high COD (Chemical Oxygen Demand), salt content and heavy metal content

A low-concentration ammonia nitrogen and treatment method technology, which is applied in the field of wastewater treatment, can solve problems such as complex wastewater components, substandard ammonia nitrogen treatment, and difficult ammonia nitrogen removal, and achieve good water effluent effect, low pollution coefficient, and low operating costs.

Active Publication Date: 2014-08-06
BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of wastewater has complex components. In the conventional treatment process, there are mainly problems such as difficult ammonia nitrogen removal and substandard ammonia nitrogen treatment. In order to solve the problem of deammonization of complex and low-concentration ammonia nitrogen wastewater, the treatment process of the present invention has the advantages of high treatment efficiency and impact load resistance. Strong, stable operation, effluent water quality up to standard, less equipment involved, simple operation, low investment cost and low operating cost, etc.

Method used

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  • Deaminizing treatment method of medium-concentration and low-concentration ammonia-nitrogen wastewater under high COD (Chemical Oxygen Demand), salt content and heavy metal content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] At room temperature, in the analysis of the substance content of complex wastewater, the concentration of ammonia nitrogen is 50mg / L, the main component of COD is sulfonated kerosene with a content of 2000mg / L, the content of salt is 50g / L, and the heavy metal ion is mainly Cu 2+ , Fe 2+ etc., the content is about 100mg / L, and the calcium concentration is 10mg / L.

[0041] The wastewater enters the adjustment tank for pH adjustment. Sodium hydroxide solution is used to adjust the pH value, and the lye is transported to the adjustment tank by the metering pump to adjust the pH value of the wastewater to about 10.

[0042] After adjusting the pH value, the wastewater enters the flocculation and sedimentation part. With the adjustment of the pH value, fine heavy metals and suspended matter are produced in the wastewater. The suspended solids and heavy metals in the wastewater are flocculated and precipitated by adding flocculant. Polyaluminum chloride is selected as the...

Embodiment 2

[0050] At room temperature, in the analysis of the substance content of complex wastewater, the concentration of ammonia nitrogen is 2000mg / L, the main component of COD is kerosene, the content is 3000mg / L, the salt content is 150g / L, and the heavy metal ion is mainly C U 2+ , Fe 2+ etc., the content is about 150mg / L, and the calcium concentration is 200mg / L.

[0051] The method of each step mentioned in the summary of the present invention is adopted again, that is, the wastewater first enters the adjustment tank for pH adjustment. Sodium hydroxide solution is used to adjust the pH value, and the lye is transported to the adjustment tank by the metering pump until the pH value is adjusted to about 10.

[0052] After adjusting the pH value, the wastewater enters the flocculation and sedimentation part. With the adjustment of the pH value, fine heavy metals and suspended solids are diluted in the wastewater. The suspended solids and heavy metals in the wastewater are floccu...

Embodiment 3

[0060] At room temperature, in the analysis of the substance content of complex wastewater, the concentration of ammonia nitrogen is 3500mg / L, the main component of COD is kerosene, the content is 4000mg / L, the salt content is 200g / L, and the heavy metal ion is mainly C U 2+ , Fe 2+ etc., the content is about 200mg / L, and the calcium concentration is 350mg / L.

[0061] The method of each step mentioned in the summary of the present invention is adopted again, that is, the wastewater first enters the adjustment tank for pH adjustment. Sodium hydroxide solution is used to adjust the pH value, and the lye is transported to the adjustment tank by the metering pump until the pH value is adjusted to about 10.

[0062] After adjusting the pH value, the wastewater enters the flocculation and sedimentation part. With the adjustment of the pH value, fine heavy metals and suspended solids are diluted in the wastewater. The suspended solids and heavy metals in the wastewater are floccu...

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Abstract

The invention discloses a deaminizing treatment method of medium-concentration and low-concentration ammonia-nitrogen wastewater under high COD (Chemical Oxygen Demand), salt content and heavy metal content. The method comprises the following steps: regulating pH of ammonia-nitrogen wastewater to be about 10 through alkali liquor to convert ammonium ions (NH<4+>) in the wastewater into volatile NH3; removing metal ions by flocculent precipitation and filtering; preprocessing wastewater through a cartridge filter; feeding the wastewater into a hydrophobic membrane, wherein the wastewater is fed through the inside bottom part of the membrane, and an acid absorption solution is fed through the outside bottom part of the membrane; enabling NH3 to penetrate the hydrophobic membrane by dissolving and diffusing in order to be absorbed by the acid solution outside the membrane, and thus reaching the purpose of removing ammonia nitrogen. According to the deaminizing treatment method, the water treated is of complex quantity; ammonia nitrogen in wastewater can be efficiently removed under high COD, high salt content and high heavy metal content conditions; and the method is simple, small in equipment investment, low in operation cost, and has a good treatment effect.

Description

technical field [0001] The present invention relates to the field of waste water treatment, in particular to a process for treating medium and low concentration ammonia nitrogen waste water with high COD, high salt content and high heavy metal content. Low-cost complex wastewater treatment technology. Background technique [0002] At present, the treatment methods for ammonia nitrogen wastewater mainly include air stripping method, ammonia distillation method, biological method, etc., but these technologies often have some problems when dealing with complex ammonia nitrogen wastewater and wastewater containing heavy metals. The ammonia removal system is affected, the removal rate of ammonia nitrogen is not high, the effluent water quality is not up to standard, resource recovery cannot be realized, and secondary pollution and other problems occur. [0003] The air stripping method consumes a lot of steam and power in the treatment of ammonia nitrogen wastewater, and the ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 黄玲华韦凤密
Owner BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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