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A method for separating and recovering ammonia in ultra-high concentration ammonia nitrogen wastewater

A technology for separation and recovery of ammonia nitrogen wastewater, applied in the field of separation and recovery of ammonia

Inactive Publication Date: 2011-11-30
陈平 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the defects of existing methods for separating and recovering ammonia in ultra-high-concentration ammonia-nitrogen wastewater, and aims to provide a new separation and recovery method. The technical problem to be solved is to effectively separate and recover ammoniacal nitrogen in wastewater

Method used

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Examples

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Embodiment Construction

[0018] 1. Preparation of denitrification agent

[0019] In terms of mass, take 65 parts of sodium carboxymethyl cellulose, 15 parts of butanediol transaminase, 8 parts of potassium ferrate, and 8 parts of sodium persulfate, or take 60 parts, 10 parts, 5 parts, 5 parts in sequence, or sequentially Take 70 parts, 20 parts, 10 parts, 10 parts, or take 70 parts, 10 parts, 10 parts, 5 parts in turn, or take 60 parts, 20 parts, 5 parts, 10 parts in turn, mix and stir evenly to get denitrification agent.

[0020] 2. Treatment of ultra-high concentration ammonia nitrogen wastewater

[0021] Now take the denitrification tower as an example, and the non-limiting examples are described as follows:

[0022] Pump the wastewater with an ammonia nitrogen concentration above 10,000 mg / L from the wastewater pool into the aeration tank of the denitrification tower, add alkali to adjust the pH to 9.5-10, and add a denitrification agent at a dose of 10-30 grams per ton of water. For the conven...

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PUM

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Abstract

The invention provides a method for separating and recovering ammonia from ultrahigh concentration of ammonia nitrogen wastewater. The method comprises separation and recovery and is characterized in that the separation process comprises: firstly pumping the ultrahigh concentration of ammonia nitrogen wastewater into an aeration tank of a denitrogenation tower, adding a denitrogenation agent, andcarrying out aeration treatment with a blower or compressed air at the pH not smaller than 9.5 and the temperature of 45-55 DEG C until the content of ammonia nitrogen in the wastewater is decreased to below 10 mg / L, wherein the denitrogenation agent is formed by mixing 60-70wt% of sodium carboxymethyl cellulose, 10-20wt% of butanediol transaminase, 5-10wt% of potassium ferrate and 5-10wt% of sodium persulfate and has a concentration of 10-30 ppm; and introducing the separated ammonia gas into a multi-stage absorbing tower from the tower top. Through once treatment of the method provided by the invention, the content of ammonia nitrogen in the ultrahigh concentration of ammonia nitrogen wastewater is decreased to below 5 mg / L, the separated ammonia is recovered, and the waste heat is simultaneously utilized.

Description

1. Technical field [0001] The invention relates to a treatment method for comprehensive utilization of wastewater, in particular to a method for separating and recovering ammonia from ultra-high concentration ammonia nitrogen wastewater. 2. Background technology [0002] Ammonia nitrogen in water mainly comes from the decomposition products of nitrogen-containing organic matter in domestic sewage under the action of microorganisms, some industrial wastewater and agricultural sources. According to the 2007 Environmental Statistical Yearbook, the discharge of ammonia nitrogen in wastewater nationwide was 1.324 million tons (excluding agricultural sources). Among them, industrial ammonia nitrogen emissions were 341,000 tons, accounting for about 26% of the total ammonia nitrogen emissions; urban domestic ammonia nitrogen emissions were 983,000 tons, accounting for more than 74% of the total ammonia nitrogen emissions. According to the results of the first national survey of po...

Claims

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Application Information

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IPC IPC(8): C02F1/58C01C1/02
CPCY02P20/129
Inventor 陈平何波罗洪波
Owner 陈平
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