Closed-loop processing integrated process for high-efficiency air stripping and tail-gas ammonia recycling of ammonia-nitrogen wastewater

A technology of ammonia nitrogen wastewater and resource utilization, applied in degassed water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of ammonia nitrogen wastewater treatment, which is difficult to meet the standard discharge total control and resource utilization Low degree, high operating cost and other problems, to achieve the effect of improving ammonia removal efficiency, reducing gas-liquid volume ratio, and significant economic benefits

Active Publication Date: 2011-05-18
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some high-concentration ammonia-nitrogen wastewater treatment technologies currently used in industry have defects such as low ammoni

Method used

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  • Closed-loop processing integrated process for high-efficiency air stripping and tail-gas ammonia recycling of ammonia-nitrogen wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The composition and concentration of high-concentration ammonia-nitrogen wastewater produced during the production process of a coking plant are: NH 3 -N, 8000~20000mg / L, pH 4~7, utilize the present invention to carry out the pretreatment steps as follows:

[0028] 1) Send the coking wastewater into the adjustment tank, add KOH to adjust the pH value to 10, and add sodium lauryl sulfate at the same time, the addition amount is 20ppm, and then preheat to 60°C with the heater;

[0029] 2) The pretreated wastewater enters the upper part of the stripping tower with corrugated wire mesh packing, and is evenly distributed on the packing by a spray distributor, and is blown off at a gas-liquid volume ratio of 1500:1, and the blown off tail gas enters the absorption through the demister Tower, the concentration of ammonia nitrogen at the bottom of the tower after first-stage stripping is 200mg / L;

[0030] 3) Ammonia-containing stripping tail gas enters the bottom of the absorp...

Embodiment 2

[0033] A chemical catalyst (V 2 o 5 ) factory wastewater, the composition and concentration are: NH 3 -N, 2000~6000mg / L, pH 7~8, using the present invention to carry out standard discharge treatment steps are as follows:

[0034] 1) Send the catalyst waste water into the adjustment tank, add NaOH to adjust the pH value to 11, and add dodecyltrimethylammonium bromide at the same time, the addition amount is 20ppm, and then preheat to 50°C through the heater;

[0035]2) The pretreated wastewater enters the blow-off tower with PVC inclined tube packing, and is evenly distributed on the packing through the orifice flow disc distributor, and blows off at a gas-liquid volume ratio of 1250:1. The ammonia nitrogen concentration of the bottom wastewater is 200mg / L; the bottom wastewater is sent to the stripping tower for secondary stripping through the feed pump, and the ammonia nitrogen concentration of the tower bottom wastewater is 15mg / L to meet the standard discharge; the stripp...

Embodiment 3

[0039] The composition and concentration of waste water from an amino acid production plant are: NH 3 -N, 800~2000mg / L, pH 3~5, utilize the present invention to carry out pretreatment steps as follows:

[0040] 1) Send the amino acid production wastewater into the adjustment tank, add KOH to adjust the pH value to 11.5, and add sodium dodecylbenzenesulfonate at the same time, the addition amount is 20ppm, and then preheat to 40°C through the heater;

[0041] 2) The pretreated wastewater enters the Pall ring packing blow-off tower, and is evenly distributed on the packing through the overflow tank distributor, blows off at a gas-liquid volume ratio of 1000:1, and the blow-off tail gas enters through the demister Absorption tower, the concentration of ammonia nitrogen at the bottom of the tower is 190mg / L after first-stage stripping;

[0042] 3) The tail gas containing ammonia is blown off into the bottom of the absorption tower, and the 35wt% acetic acid absorption solution sp...

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Abstract

The invention relates to a closed-loop processing integrated process for the high-efficiency air stripping and the tail-gas ammonia recycling of ammonia-nitrogen wastewater, which is characterized in that: by selecting the types of fillers, tower internals and the like of an ammonia-nitrogen air-stripping tower and strengthening a gas-liquid mass transferring process, the ammonia removing efficiency is improved, and meanwhile, the gas-liquid volume ratio is reduced, thereby the energy consumption is markedly reduced; the invention provides a renewable ammonia-absorbing solution which can be used for efficiently absorbing the ammonia in air-stripping gas, and the ammonia is regenerated and desorbed to obtain strong ammonia water with the concentration of 10-25wt%, therefore, the high-efficiency recovery and the recycling of the ammonia in the air-stripping gas is realized, and the absorbing solution is recycled after being regenerated; the purified gas after absorption is used as the air-stripping gas for closed-loop circulating by adopting a closed-loop circulating technology, thereby the reaction heat in the absorbing process is effectively recovered, the energy consumption is further reduced, and meanwhile, the secondary pollution is eliminated; and the ammonia-removing and recycling processes of the wastewater are developed into a set of modularized process technologies by applying an integrated technology, thereby the technical requirements of industrial enterprises on processing the ammonia-nitrogen wastewater with different concentrations are satisfied.

Description

Technical field: [0001] The invention belongs to the technical fields of chemical industry and environmental protection, and relates to a treatment method for high-concentration ammonia-nitrogen wastewater treatment and ammonia resource utilization, in particular to an integrated process for closed-circuit treatment of ammonia-nitrogen wastewater with high-efficiency stripping and tail gas ammonia resource utilization. Background technique: [0002] With the rapid development of my country's economy, it is accompanied by the discharge of a large amount of ammonia nitrogen wastewater, resulting in a large amount of ammonia nitrogen enrichment in water bodies, which is one of the main causes of eutrophication and deterioration of water bodies. Major water crisis incidents caused by water eutrophication occur from time to time, seriously affecting people's normal life, and even endangering people's health, with huge social impact. Ammonia nitrogen in water mainly comes from the...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01C1/10C02F1/20
CPCY02P20/10
Inventor 赵贤广徐炎华李武
Owner NANJING UNIV OF TECH
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