Membrane absorption deamination method and system based on direct contact microporous aeration enhancement

A microporous aeration and contact technology, applied in the field of membrane absorption deamination system, can solve problems such as high volatilization rate, maintain long-term efficient operation, and have the advantage of operating cost.

Active Publication Date: 2022-07-05
GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI
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Problems solved by technology

Although the membrane aeration method can remove most of the ammonia nitrogen in the wastewater, the concentration of the ammonia nitrogen wastewater entering the membrane absorption contactor is still not low, and the hydrophilization problem caused by the membrane surface pollution caused by inorganic salts, colloids and organic matter in the wastewater is in the persists in the long run
[0007] So far, the hydrophilization problem caused by membrane fouling is still a bottleneck problem restricting the industrialization of membrane absorption process.

Method used

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  • Membrane absorption deamination method and system based on direct contact microporous aeration enhancement
  • Membrane absorption deamination method and system based on direct contact microporous aeration enhancement

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Embodiment 1

[0055] 30L of hydrometallurgical wastewater with an ammonia nitrogen concentration of 3000mg / L was treated by the membrane absorption deamination method enhanced by direct contact microporous aeration.

[0056] Membrane absorption deamination process: flocculation and sedimentation of the ammonia nitrogen wastewater stock solution through the pretreatment device, and filtering to remove most of the suspended solids. The pretreated high ammonia nitrogen wastewater enters the raw water circulation tank, and sodium hydroxide is added to the raw water circulation through the dosing system to adjust the pH value of the raw water to 11.5, the feed liquid pump is turned on, and the ammonia nitrogen wastewater from the raw water circulation tank enters the heat exchanger for preheating After reaching 35°C, pump into the shell side of the hollow fiber membrane contactor assembly of polytetrafluoroethylene (PTFE, filtration pore size: 0.2-0.45μm); add 20L of sulfuric acid with a concentr...

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Abstract

The invention relates to the technical field of wastewater treatment, in particular to a membrane absorption deamination system and method based on direct contact microporous aeration enhancement. The direct-contact aeration-enhanced membrane absorption and deamination process of the present invention can not only reduce the pollution deposition on the membrane surface through aeration, reduce the problems of membrane wetting and hydrophilization caused by the membrane pollution, and reduce the cleaning frequency of the membrane module; secondly, it can also The gas-liquid two-phase flow is formed by aeration stripping, which can effectively reduce the resistance of the mass transfer process, improve the volatilization rate of ammonia in the wastewater and the transmembrane speed of ammonia, and improve the deamination efficiency. The method has great advantages in terms of investment cost and operating cost, and is a new wastewater deamination and ammonia recovery technology with energy saving, consumption reduction and sustainable resource development.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a membrane absorption deamination system and method based on direct contact microporous aeration enhancement. Background technique [0002] Ammonia nitrogen is one of the main factors causing water eutrophication and environmental pollution, which seriously threatens the production, life and ecological balance of human beings. How to economically and effectively remove and recycle ammonia nitrogen in wastewater to reduce environmental pollution has become an urgent and important research. subject. Industrial ammonia nitrogen wastewater has become the main source of ammonia nitrogen in my country's current wastewater due to the characteristics of high ammonia nitrogen concentration, poor biodegradability and great environmental damage. The discharge of industrial ammonia nitrogen wastewater into the water body will not only cause eutrophication of the water body, cau...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F9/10B01D53/18B01D65/02C02F101/16
CPCC02F9/00B01D53/18B01D65/02C02F2101/16C02F1/44C02F1/00C02F2209/14C02F2209/40C02F2209/02C02F2209/03B01D2321/18B01D1/02
Inventor 陈静陈顺权钟文蔚吴启锦
Owner GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI
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