What is the Odour control systems in WWTP?
The odour produced by wastewater systems is caused by hydrogen sulfide (H2S), which is emitted as a gas. Furthermore, hydrogen sulfide can also cause corrosion in collecting systems and wastewater treatment facilities, resulting in severe leaks. Several emission sources, such as pump stations, wet wells, sludge dewatering, manholes, air valve chambers, and so on, require odour control equipment’s.
Sewage and effluent odours are mostly composed of hydrogen sulphide (H2S), which is hazardous when discharged into the environment. The gas comprises organic sulphur components (mercaptans, hydrocarbons) as well as ammonia.VOCs (Volatile Organic Substances), H2S, and Volatile Fatty Acids (VFAs) are odorous compounds that may be found in a variety of other sectors.Although scents may not always cause physical health concerns, they do affect the environment and cause complaints to the source.Odorous VOCs can be produced as a result of microbial or thermal decomposition of organic matter, which is a typical process in breweries, wastewater treatment facilities, cooking, and food sectors.
As a result, by adding the proper odour control units to the wastewater treatment plant, the problem may be treated easily without jeopardizing health and living conditions.
Units for Odour Control
The best way to manage odour is to install an odour control unit in the wastewater treatment facility. The odour control equipment’s will remove odorous gases from collecting tanks or designated areas and discharge odourless air into the environment. Various established odour control methods, such as activated carbon adsorption, chemical scrubbers, and biological oxidation systems, are available in the market. However, selecting the correct technology is extremely vital for the plant to efficiently eliminate the odour and run the plant with low operating costs.
1: System of Activated Carbon Adsorption
The principle of adsorption is used in activated carbon-based systems, which adsorb the odorous gas molecule to the surface of the medium, oxidize the odorous gas, and release the odourless gases to the atmosphere. For wastewater odour removal applications, filter medium capable of eliminating Hydrogen Sulfide, Ammonia, VOCs, and mercaptans are used.
Activated carbon medium that can efficiently handle these odorous gases should be used.For sewage odours, chemically impregnated activated carbon media and specifically treated virgin activated carbon media are used.
Water scrubbing with appropriate oxidizing or neutralizing chemicals is used in chemical oxidation to control odours. For wastewater odours, sodium hypochlorite, sodium hydroxide, or a combination of the two is commonly employed for oxidation and neutralization.This is a good approach to explore for intermittent odour control applications in bigger plants. In addition, the outflow from the scrubbing unit must be monitored to ensure that it does not interfere with the downstream treatment plant's process. Odour elimination effectiveness is typically about 99 percent.
3: Biochemical Oxidation
Biological systems are being preferred for municipal or industrial wastewater treatment facilities due to their cheaper long-term running costs. These are classified into three types: biofilters, bio-trickling filters, and bio-scrubbers.Though the primary odour elimination technique is biological oxidation of odorous gases by microorganisms, there is a little difference in the type of microbe that develops in the aforementioned filters.
The contact period of the packed bed with the odorous gases may be adjusted to change the efficacy of odour elimination. The effectiveness is typically 99 percent. Thus, municipal treatment facilities use a two-stage technique, biological followed by activated carbon adsorption, to reduce odour annoyance and to achieve constant odour elimination efficacy.
Netsol Water is a high-tech vendor that specializes in odour removal systems, bio-scrubbing, and activated carbon adsorption for a variety of odour and gas removal applications.