Device and method for dissolved gas film deamination

A gas-dissolved and deammonia technology, applied in chemical instruments and methods, degassed water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of high treatment cost, secondary pollution, low pH value, etc. To achieve the effect of convenient operation and management, easy modular design, and improved deamination efficiency

Inactive Publication Date: 2015-08-05
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Claims
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Problems solved by technology

However, by-products such as ammonium sulfate and ammonium chloride formed after membrane absorption and deamination, due to low concentration and low pH value, cannot be directly used as fertilizers, and the recovery of waste absorption liquid needs to be solved.
At present, the "evaporation-concentration-crystallization salt production technology" generally used has the practical problem of high processing cost. The comprehensive utilization of waste absorption liquid often has a great relationship with the industry in which the enterprise is engaged, the geographical location and the industrial environment. , generally speaking, the disposal of waste absorption liquid is a rather difficult problem, and improper disposal can easily cause secondary pollution
[0008] Compared with membrane absorption deamination, ammonia nitrogen recovery can be realized by vacuum membrane deamination, but the deamination efficiency of vacuum membrane deamination is limited, and its deamination efficiency is related to initial ammonia nitrogen concentration, temperature, vacuum degree, pH, deamination time and Membrane performance is directly related to it. Generally, vacuum deamination industrial devices only have a deamination efficiency of about 60-88%. After deamination, it is difficult to discharge wastewater up to standard. The vacuum membrane deamination treatment technology and process for high deamination efficiency is the current vacuum The main research content of membrane deamination

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  • Device and method for dissolved gas film deamination

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Experimental program
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Effect test

Embodiment

[0032] Such as figure 1 As shown, the arrow indicates the direction of water flow, and the water flow must flow in the direction of the arrow, not against the direction of the arrow.

[0033] The equipment of the present invention for dissolved gas membrane deamination comprises a membrane deamination circulation tank, a dissolved air pump, a dissolved gas membrane deamination membrane module, an ammonia recovery system and a fluid flow switching valve, the membrane deamination circulation tank and the dissolved gas The deamination membrane module forms a circulation loop through the dissolved air pump, the dissolved air pump is connected to the membrane deamination circulation tank, the described gas-dissolved deamination membrane module is connected to the ammonia recovery system, and the The fluid flow direction switching valve 1 and the fluid flow direction switching valve 2 are used to adjust and control the flow direction and flow rate of the waste water liquid.

[0034...

Embodiment 1

[0037] Containing NH 4 The concentration of ammonia nitrogen in the Cl wastewater is 1200mg / L, and the pH value of the solution is 8.6. First, use 0.1M NaOH solution to adjust the pH value to always be 10.0. The liquid flow rate of the film deamination circulation system is 0.1m / s, and the vacuum degree of the vacuum pump is set at 90kPa. Here, the dissolved gas membrane deamination membrane module is a polypropylene hollow fiber membrane module made in the laboratory, with a porosity of 40%, the inner and outer diameters of the membrane filaments are 0.22mm / 0.30mm, the membrane pore diameter is 0.02-0.08μm, and the effective length of the membrane filaments is 10mm, the effective membrane area of ​​the membrane module is 0.18m 2 . Use the dissolved air pump to pre-dissolve the air to form dissolved air water containing 3% air before the waste water contacts the surface of the membrane filament. Adjust the readings of the instruments of the dissolved air pump as follows: pre...

Embodiment 2

[0039] The concentration of ammonia nitrogen in a certain wastewater is about 3200mg / L, the water temperature is 52°C, and the pH is 6.7. The deamination process is carried out by the dissolved air membrane deamination method.

[0040] First, use 40% NaOH solution to adjust the pH of the wastewater to 11.0, control the water temperature to 50°C, and introduce 40L of wastewater to the membrane deamination circulation tank. After filtering through a 10μm filter, control the amount of dissolved air in the dissolved air pump to 5% to form dissolved air water, which is then pumped into the dissolved air membrane deamination module. The membrane module adopts polypropylene degassing membrane module, which has a large specific surface area. The inner / outer diameter of the membrane filament is 0.3mm / 0.22mm, the pore diameter is 0.04-0.06μm, the porosity is 40%, and the membrane surface area is 0.9m2. The vacuum degree is set to -95kPa, the liquid flow rate is 0.1m / s, and the readings...

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Abstract

The invention relates to a device and a method for dissolved gas film deamination and belongs to the technical field of waster water deamination. The method includes that potential of hydrogen (pH) value of ammoniated waster water is adjusted to 9-11 in advance by NaOH, the waster water is subjected to pretreatment through a 5-20 micrometer filter to enter a film deamination circulating trough, a dissolved gas pump fully mixes the ammoniated waste water with air to form dissolved gas water of which gas water dissolving gas volume ratio is smaller than 8%, the dissolved gas water is pumped into a dissolved gas film deamination module, the water is subjected to deamination by the dissolved gas film deamination module to return to the film deamination circulating trough, and waste water flowing direction after deamination is controlled through a first fluid flowing direction switching valve and a second fluid flowing direction switching valve. The dissolved gas film deamination module is connected with an ammonia recycling system, and removed ammonia gas is collected and recycled. Compared with traditional film deamination processes, the device and the method for dissolved gas film deamination have the advantages that vacuum deamination efficiency of ammonia-nitrogen wastewater can be remarkably improved, the device and the method are applicable to treatment of low and high ammonia-nitrogen wastewater, the operation is simple, the floor space is small, modularized design is easy, and the like.

Description

technical field [0001] The invention belongs to the field of deammonization of waste water, and in particular relates to a device and a method for deammonization by an air-dissolved membrane. The method combines two deammonization methods of blowing off method and vacuum membrane deammonization. Background technique [0002] As a common water and air pollution, ammonia nitrogen pollution will cause great harm to human health and the ecological environment. Ammonia nitrogen is one of the main oxygen-consuming pollutants in water bodies. If it is directly discharged into water bodies, it will easily cause eutrophication of water bodies. my country's ammonia nitrogen wastewater has a large amount and a wide range, mainly from petrochemical, metallurgical, pharmaceutical, chemical fertilizer and other industrial wastewater, as well as human and animal excrement, domestic sewage, and secondary effluent from waste treatment plants. [0003] At present, the main technologies for tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/20C02F1/44C02F9/04
Inventor 王军李权耕张勇
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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