H₂S Scrubber

We provide H2S Scrubbing solution for 100 CUM per hour onwards

Introduction:

Industrialization and urbanization of the society in the present world has increased the levels of pollution in all the three sectors, land, air and water due to the wastes generated. Proper treatment and disposal of the same in order to prevent the damage to the natural resources and the environment is being recognized and pursued at various degrees of seriousness around the world. Different methods are in vogue depending on the type of waste, whether it is biodegradable or non-biodegradable. One of the most common and effective way of treating the biodegradable matter is anaerobic digestion and is infact part of most of the distillery effluent treatment plants and sewage treatment plants. Biogas the product of anaerobic digestion is a mixture of Methane, Carbon dioxide and Hydrogen sulfide. The composition of biogas is mainly Methane, CH4 (55-65 %), Carbon dioxide, CO2, (30 - 40 %) and hydrogen sulfide, H2S, (0 - 6 %) depending on the type of waste and the temperature of the digester used. The calorific value of biogas is around 24 – 28 MJ/ m3 (depending on the CH4 content in the gas) and is a potential and efficient fuel source for power generation using IC engines, if the hydrogen sulfide is removed from it.

Need for Hydrogen Sulphide Removal:

Hydrogen sulphide is a highly toxic and corrosive gas and is a major pollutant in fossil fuel based industries, sulphur based chemical Industries and biogas based units and is characterized by the ‘rotten egg’ smell at low concentrations. Sweetening of biogas is essential because of its toxicity which affects the environment and the highly corrosive nature which corrodes the metallic parts like boiler tubes, engines coming in contact with it in few hundred hours of operation.

Association / Partnership

To provide gas cleaning process to the industries and also to provide a single point contact from gas cleaning to power generation on biogas, Green Power International (P) Ltd. has entered into an association with Indian Institute of Science, Bangalore (IISc) for providing H2S Scrubbing Systems. 

Process Principle:

ISET process developed by ABETS, IISc is based on the red-ox reaction of chelated polyvalent metal ion. In this particular process iron in aqueous medium, which exists in both Fe3+ and Fe2+ form, is used for scrubbing hydrogen sulfide from the biogas. The sulfur present in the hydrogen sulfide is precipitated as elemental sulfur.

H2S Scrubbing, a brief Process Description

• The process uses the counter current gas liquid contacting with the gas being taken from the bottom of the packed scrubber column and the scrubbed liquid is pumped form the top in a two stage scrubbing operation.
• The gas coming out of the scrubber column, which is free of hydrogen sulfide, is then scrubbed with water for cleaning any minute quantities of chemical carried over.
• The clean gas thus obtained is fit for the end application.
• The scrubbed solution containing sulfur is then passed through filter press for sulfur removal.
• The clear filtrate is then regenerated in a counter current with air in a packed re-generation column.