Method for treating coal gasification wastewater containing phenol and ammonia

A technology for coal gasification wastewater and phenolic ammonia, applied in chemical instruments and methods, water/sewage multi-stage treatment, degassed water/sewage treatment, etc., can solve the problems affecting the normal operation of equipment, cannot fix ammonia removal, and affect biochemical treatment, etc. problems, to ensure long-term stable operation, alleviate ammonia salt crystallization and scaling problems, and improve the removal rate

Inactive Publication Date: 2009-12-09
SOUTH CHINA UNIV OF TECH +2
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] The most prominent shortcomings of the existing process are: the water quality is alkaline during extraction, which is not conducive to extraction, resulting in poor dephenolization effect; due to the high content of carbon dioxide, and the deamination is carried out at the end, there are always more carbon dioxide and In the case of ammonia coexistence, the reaction between the two will produce ammonia salt crystallization, which will cause equipment scaling and serious blockage, which will affect the efficiency of the equipment; the existing process is a foaming system, which is prone to flooding and affects the normal operation of the equipment
This patented technology cannot remove fixed ammonia, and the content of fixed ammonia in purified water from a single tower exceeds the water quality standard for subsequent biochemical treatment, affecting biochemical treatment

Method used

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  • Method for treating coal gasification wastewater containing phenol and ammonia

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this example, the above-mentioned device for treating phenamine-containing coal gasification wastewater is used for wastewater treatment. The total phenol content of coal gasification sewage is 6010mg·L -1 , free ammonia 12.61g·L -1 , fixed ammonia 0.60g·L -1 , CO 2 4.26g·L -1 , the pH value is 9.8, the water temperature is 87°C, the flow rate is 92.64 tons / hour, according to figure 1 process shown. The cold and hot feed ratio of the sewage stripping tower is 1:3.6, the tower top temperature is 45.86°C, the tower top pressure is 0.47MPa, the tower bottom temperature is 157°C, the tower bottom pressure is 0.47MPa, and the mass percentage concentration is 20% caustic soda The flow rate of aqueous solution is 380kg·hr -1 , the temperature of side stream production is 140.0°C and the pressure is 0.46MPa. The operating pressure of the first-stage partial condenser in the three-stage partial condenser is 0.40MPa, and the operating temperature is 137.7°C; the operat...

Embodiment 2

[0029] In this example, the above-mentioned device for treating phenamine-containing coal gasification wastewater is used for wastewater treatment. The total phenol content of coal gasification sewage is 6050mg·L -1 , free ammonia 20.43g·L -1 , fixed ammonia 1.34g·L -1 , CO 2 2.83g·L -1 , the pH value is 11.0, the water temperature is 89°C, the flow rate is 60.01 tons / hour, according to figure 1 process shown. The cold and hot feed ratio of the sewage stripper is 1:4.0, the tower top temperature is 41.14°C, the tower top pressure is 0.48MPa, the tower bottom temperature is 161.7°C, the tower bottom pressure is 0.51MPa, and the 60% (mass) lye is 120kg·hr -1 , the temperature of the side line production is 151.0°C, and the pressure is 0.49MPa. The operating pressure of the first stage partial condenser is 0.40MPa, the operating temperature is 144.8°C, the operating pressure of the second stage partial condenser is 0.36MPa, the operating temperature is 97.2°C, and the oper...

Embodiment 3

[0031] In this example, the above-mentioned device for treating phenamine-containing coal gasification wastewater is used for wastewater treatment. The total phenol content of coal gasification wastewater is 5415.9mg·L -1 , free ammonia 19.66g·L -1 , fixed ammonia 0.37g·L -1 , CO 2 3.94g·L -1 , the pH value is 10.5, the water temperature is 85°C, the flow rate is 85.4 tons / hour, according to figure 1 process shown. The cold and hot feed ratio of the sewage stripper is 1:3, the tower top temperature is 40.6°C, the tower top pressure is 0.50MPa, the tower bottom temperature is 165°C, the tower bottom pressure is 0.52MPa, and the 20% (mass) lye is 350kg·hr -1 , the temperature of the side line production is 152.0°C, and the pressure is 0.50MPa. The operating pressure of the first stage partial condenser is 0.42MPa, the operating temperature is 145°C, the operating pressure of the second stage partial condenser is 0.39MPa, the operating temperature is 79.69°C, and the opera...

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Abstract

The invention relates to a method for treating coal gasification wastewater containing phenol and ammonia. The method comprises the following steps: single tower alkali injection and pressurization steam stripping removal of acidic gas and ammonia, three-level dephlegmation of lateral line tapped gas, extraction of phenol by diisopropyl ether and solvent recovery. The cold and hot coal gasification wastewater, according to a certain proportion, respectively enters a pressurization single tower from the upper part and middle upper part of a wastewater steam stripping tower, and acid gas is discharged from the tower top; the lateral line withdrawal mixed gas goes through three-level dephlegmation to obtain high-concentration ammonia, alkali is injected at the position below the lateral line to transform fixed ammonia into free ammonia which is to be removed; counter-current extraction is carried out on removed ammonia, residue of acid gas and diisopropyl ether to dephenolize; extraction solvent is recovered by a solvent recovery tower and a solvent steam stripping tower to obtain the byproduct, namely crude phenol. In the method of the invention, the process removing acid gas, free ammonia and fixed ammonia is carried out simultaneously on the coal gasification wastewater in the wastewater steam stripping single tower, as a result, high-concentration ammonia is obtained, the content of carbon dioxide, sulfureted hydrogen, free ammonia and fixed ammonia in tower kettle purified water is extremely low, encrustment is not prone to take place, and the purified coal gasification wastewater meets the requirement of follow-up biochemical treatment.

Description

technical field [0001] The invention relates to a method for treating phenolic ammonia-containing coal gasification wastewater, in particular to a method for treating coal gasification wastewater by injecting alkali, pressurizing stripping and simultaneously deacidifying and deammonizing. Background technique [0002] Coal gasification wastewater comes from highly polluted wastewater produced during gas scrubbing. The water quality is complex and the pollutants mainly include ammonia, carbon dioxide, unit phenols, polyphenols, fatty acids, etc., and the content of hydrogen sulfide is low. These substances are all polar substances, and ammonia, carbon dioxide, and hydrogen sulfide are all volatile weak dielectrics in aqueous solution. H in wastewater 2 S, CO 2 Acidic gases such as ammonia will interfere with the treatment process, causing equipment corrosion and scaling, and ammonia also has an inhibitory effect on microorganisms, affecting subsequent biochemical treatment....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/20C02F1/26
Inventor 陈赟姜殿臣盖恒军钱宇宁秋实冯大春高亚楼崔健韩雪冬余振江吴昌祥周志远周永涛孙玉江
Owner SOUTH CHINA UNIV OF TECH
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