Multistage-membrane-extraction biological integrated treatment system for processing high ammonia nitrogen in wastewater, and method thereof

A wastewater treatment and comprehensive treatment technology, which is applied in the field of environmental water purification, can solve the problems of ineffective utilization of disposal, low removal rate of air stripping process, and low concentration of ammonium sulfate, so as to improve efficiency, avoid solvent loss, and improve transmission efficiency. The effect of mass efficiency

Inactive Publication Date: 2014-02-05
SUZHOU SUJING ENVIRONMENTAL ENG
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Problems solved by technology

For high-concentration inorganic ammonia-nitrogen wastewater, blowing-off method is often used in industrial applications at present, but the removal rate of blowing-off process is low, and the concentration of ammonium sulfate generated after absorption of ammonia nitrogen blown out is low, which cannot be effectively utilized and is difficult to dispose of, and easily produces secondary Pollution

Method used

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  • Multistage-membrane-extraction biological integrated treatment system for processing high ammonia nitrogen in wastewater, and method thereof

Examples

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Effect test

Embodiment 1

[0019] The ammonia nitrogen concentration of the landfill leachate in a landfill site is 1000mg / L. The particulate matter in the leachate is removed by grid filtration, and then filtered through a high-efficiency fiber filter and a security filter in turn. The pH of the leachate is adjusted to about 10 with lime. Entering the first-stage extraction membrane treatment, under the action of the ammonia partial pressure difference on both sides of the membrane, the ammonia nitrogen in the wastewater is converted into ammonia molecules NH 3 The form permeates the membrane and is absorbed by the acid to form an ammonium salt. After testing, the concentration of ammonia nitrogen in the effluent of the first-stage extraction membrane dropped to 360mg / L, and then treated by the second-stage extraction membrane, the concentration of ammonia nitrogen dropped to below 100mg / L, and after comprehensive biological treatment, the concentration of ammonia nitrogen dropped to below 5mg / L The el...

Embodiment 2

[0021] The average concentration of ammonia nitrogen in a chemical and pharmaceutical wastewater is 5600 mg / L. The particulate matter in the leachate is removed by grid filtration, and the pH of the leachate is adjusted to about 11 with sodium hydroxide, and then filtered through a disc filter to enter the primary extraction. Membrane treatment, under the action of the ammonia partial pressure difference on both sides of the membrane, the ammonia nitrogen in the wastewater is converted into ammonia molecules NH 3The form permeates the membrane and is absorbed by sulfuric acid to form ammonium sulfate. After testing, the concentration of ammonia nitrogen in the effluent of the first-stage extraction membrane dropped to 2200mg / L, and then treated by the second-stage extraction membrane, the concentration of ammonia nitrogen dropped to below 560mg / L, and after the treatment of the third-stage extraction membrane, the concentration of ammonia nitrogen dropped to below 6mg / L. The r...

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Abstract

The invention discloses a multistage-membrane-extraction biological integrated treatment system for processing high ammonia nitrogen in wastewater, and a method thereof. The multistage-membrane-extraction biological integrated treatment system comprises: a pre-processor provided with a first water inlet for the entrance of high ammonia nitrogen wastewater; a pH adjuster connected with a first water outlet of the pre-processor; a filter connected with a second water outlet of the pH adjuster through a pipeline; a multistage membrane extractor sequentially comprising a first-stage membrane extractor, a second-stage membrane extractor and a third-stage membrane extractor, wherein the first-stage membrane extractor is connected with a third water outlet of the filter, the first-stage membrane extractor, the above three membrane extractors are connected through a pipeline, an extraction membrane is arranged in each of the membrane extractors, and the extraction membrane parallels to the flow direction of the wastewater and an extracting liquid; and a biological integrated process connected with the first-stage membrane extractor, the second-stage membrane extractor and the third-stage membrane extractor respectively, and a water outlet of the third-stage membrane extractor is provided with an deammoniated water collector.

Description

technical field [0001] The invention relates to the field of environmental water quality purification, in particular to a biological comprehensive treatment system and method for multi-stage membrane extraction of high ammonia nitrogen in wastewater. Background technique [0002] Nitrogen is present in wastewater as organic nitrogen, ammoniacal nitrogen (NH 4 + -N), nitrate nitrogen and nitrite nitrogen exist in various forms, and ammonium nitrogen is one of the most important forms of existence. Petroleum, chemical, food, and pharmaceutical industries, as well as urban domestic sewage and landfill leachate, all have relatively large emissions of ammonia nitrogen. There are many sources of ammonia nitrogen pollution, the amount of discharge is large, and the concentration of discharge varies greatly. According to statistics, in 2012, the discharge of ammonia nitrogen in wastewater nationwide was 610,000 tons; the discharge of ammonia nitrogen in urban domestic wastewater ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 朱国营马楫王磊
Owner SUZHOU SUJING ENVIRONMENTAL ENG
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