Views: 11 Author: Xicheng Ep Ltd Publish Time: 2021-09-14 Origin: Xicheng Ep Ltd
Commonly used chemical absorbents in waste gas scrubbers
1. Alkaline solution
Alkaline absorbents usually contain 1%~10% sodium hydroxide solution, which has a significant effect on eliminating hydrogen sulfide waste gas. Others such as methyl mercaptan, methyl sulfide, methyl disulfide, and lower fatty acids often cause odor in wastewater treatment plants. The treatment effect is also very significant for flavor substances.
2. Acidic solution
Acid liquid washing is mainly used to eliminate the odor caused by alkaline gases such as ammonia and trimethylamine. Generally, sulfuric acid (0.5%-5% solution) is used as the washing liquid.
3. Sodium hypochlorite solution
Sodium hypochlorite is generally used together with acid-base absorbents. For methyl sulfide that is difficult to eliminate by other methods, the control effect of sodium hypochlorite absorbent is very good.
When dealing with high-concentration odors, the concentration of sodium hypochlorite solution (effective chlorine concentration) is about 500-2000 ppm; when dealing with lower-concentration odors, the concentration of sodium hypochlorite solution is about 50-500 ppm. In terms of the performance of various oxidants, sodium hypochlorite is the cheapest and has a good treatment effect, so it is widely used. The sodium hypochlorite in the solution is in the form of hypochlorous acid (HOCl):
NaOCl+ H2O→HOCl+ NaOH
At pH=7.5, the available chlorine of the hypochlorite solution exists as 50% HOCI and hypochlorite ion (OCl-);
At pH=l0, only 0.3% of available chlorine exists as HOCl;
pH=l1 or 12, HOCl is almost completely dissociated into useless hypochlorite ions, so the pH control is very heavy.
Performance characteristics of waste gas scrubber
The water-washing waste gas treatment system is cheap and the treatment method is simple;
The vertical structure is most suitable for installation in economical space;
Suitable for gaseous and liquid pollution sources;
Deal with a single source of pollution;
Suitable for medium and low air volume;
The scope of application of Xicheng Ep Ltd Waste Gas Washing Tower
Treatment of various harmful gases such as H2S, SOX, NOX, HCI, NH3, CI2 and other gases;
Deodorizing devices in garbage transfer stations or yards and sewage treatment plants;
Process exhaust treatment in the semiconductor optoelectronic industry;
Waste gas treatment in the seepage water storage tank of the landfill;
Treatment of waste gas from incinerators and industrial furnaces.