Treatment method and apparatus for recycling ammonia nitrogen wastewater

An ammonia nitrogen wastewater and treatment device technology, which is applied in water/sewage multi-stage treatment, heating water/sewage treatment, degassed water/sewage treatment, etc. problems such as low controllability and low adaptability, to achieve the effect of ensuring the pretreatment effect, saving the dosage of chemicals, and reducing energy consumption

Inactive Publication Date: 2008-12-10
ZHEJIANG UNIV
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Problems solved by technology

[0007] Although there are many ways to remove ammonia nitrogen, and sometimes combined treatment with multiple technologies, there is no method that can efficiently, economically and stably treat ammonia nitrogen wastewater. Some processes bring secondary pollution while ammonia nitrogen is released, and due to different Due to the difference in the nature of wastewater, different technologies and processes must be adopted in a targeted manner
At present, most of these processes and equipment have the following problems: ①The process equipment is only for one or a few types of industrial wastewater, which is not conducive to complete sets and promotion; ②The process equipment is mainly used for pollutant treatment, and rarely has materials and Energy recovery system; ③ Even if there are resource recovery processes and devices, their processing efficiency and recovery rate are generally not high; ④ Process equipment is greatly affected by conditions such as pH, temperature, pollution load and other pollutants in wastewater, and the controllability and poor adaptability

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Examples

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Embodiment 1

[0051] The ultra-high concentration ammonia nitrogen wastewater discharged by a metallurgical plant is about 350t / d, and the main pollutants in the wastewater are: pH 3-10, NH 3 -N6500~13500mg / L, SS 300mg / L, in addition, it also contains a certain amount of inorganic salts and a small amount of heavy metal ions. Utilize technique and equipment of the present invention to carry out the technological process of deammonification treatment as follows:

[0052] (1) Ultra-high concentration ammonia nitrogen wastewater first enters the automatic dosing system. The dosing system is divided into two parts: the first part is the heavy metal precipitation system. After adjusting the pH to close to neutral, the metering pump is used to add TMT heavy metal precipitant and PAC coagulation agent, mixed evenly in the pipeline mixer; the second part is the pH adjustment system, the KOH solution of 1-5mol / L is added by the metering pump, the pH value of the wastewater is adjusted to 12.0-13.8, ...

Embodiment 2

[0058] The discharge of high-concentration ammonia-nitrogen wastewater from a tanning enterprise is about 800t / d, and the wastewater quality is: pH 6-11, NH 3 -N 300~5000mg / L, also contains a certain amount of Cr 3+ and a very small amount of Cr 6+ . Utilize technique and equipment of the present invention to carry out the technological process of deammonification treatment as follows:

[0059] (1) High-concentration ammonia nitrogen wastewater enters the automatic dosing system first. The pH adjustment of the dosing system is divided into two sections: the first section is filled with saturated Ca(OH) by the quantitative dosing device 2 Solution, adjust the pH to 9.0-10.0 and precipitate Cr, and filter it out through the filter tank; in the second stage, add 10-30% NaOH solution by the metering pump to adjust the pH value of the wastewater to 12.5-13.5.

[0060] (2) High-concentration ammonia-nitrogen wastewater enters the steam heater after Cr removal and pH adjustment, ...

Embodiment 3

[0065] The discharge of ammonia nitrogen wastewater from a fertilizer factory is about 500t / d, and the wastewater quality is: pH5~8, NH 3 -N 800~1250mg / L, and also contains a small amount of phosphate. Utilize technique and equipment of the present invention to carry out the technological process of deammonification treatment as follows:

[0066] (1) Ammonia nitrogen wastewater enters the automatic dosing system first. The dosing system is divided into two sections: the first section is the phosphorus removal section, and the saturated Ca(OH) is added by the metering pump 2 solution, adjust the pH to 9.5-11.0, and filter out calcium phosphate with a filter membrane; in the second stage, add 0.5-2mol / L NaOH solution by a metering pump to adjust the pH value of the wastewater to 12.2-13.4.

[0067] (2) The ammonia nitrogen wastewater then enters the steam heating device (using waste steam in the factory) to raise the water temperature to 63.5-72.5°C. The steam heater is equipp...

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Abstract

The invention relates to a method and a device for recycling treatment of ammonia nitrogen wastewater. The use method combining the device comprises the following steps that: a PH value of ammonia nitrogen wastewater is adjusted in an automatic medicine addition device; the ammonia nitrogen wastewater is preheated in a preheater, evenly distributed by a spraying device in a removal working section and collected in a bottom liquid storage zone; after ammonia is blown off by adopting forced-air blast, the ammonia in the wastewater is repeatedly removed by a circulating spraying system, purified and discharged from an effluent weir; ammonia-containing waste gas is filtered by a demisting device and subject to multilevel spraying and absorption so as to reclaim an ammonia crude product; and the purified gas is exhausted from the top part. The method and the device for recycling treatment of the ammonia nitrogen wastewater are suitable for ammonia nitrogen wastewater produced in the process of various industrial and agricultural productions, the treatment of domestic sewage and the resource utilization of materials, reclaim useful substances as possible while treating wastewater, reduce the cost for pollutant treatment and the emission of the pollutants and improve economical benefit while protecting environment.

Description

technical field [0001] The invention belongs to the technical fields of chemical industry and environmental protection, and relates to a technical method for ammonia nitrogen wastewater treatment and resource utilization of materials, in particular to a method and a device for removing ammonia in wastewater and absorbing it for reuse. Background technique [0002] Ammonia nitrogen in wastewater is one of the main substances that cause water eutrophication and environmental pollution. The hazards of ammonia nitrogen wastewater to the environment and human health mainly include the following points: ①It is easy to cause a large number of algae and other microorganisms in the water, which makes the operation of the tap water treatment plant difficult and causes drinking water odor; ②The dissolved oxygen in the water decreases, and a large number of fish die. It may even lead to the drying up of lakes; ③Increase the amount of chlorine used in water supply disinfection and indust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/04C02F1/20C01C1/10
Inventor 赵伟荣郭森李华靖庄君新
Owner ZHEJIANG UNIV
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