What is Adsorption and Bio oxidation for wastewater treatment?
Adsorption & Bio oxidation is a two-stage version of the Activated Sludge Process (ASP), which is used to treat wastewater. It has one stage with a high load and another stage with a low load. Since the entire procedure is based on a completely dynamic biological system, a primary clarifier is not required. These stages have their own sludge collection lines and settling tanks, enabling different microbial populations in each reactor.
Working process ofAdsorption and Bio-oxidation
Stage 1:Due to high loading rates and brief sludge retention times, flocculation or sorption processes are generally used in the first stage, for the removal of influent organic matter. The occurrence of hydrolysis of complex organic compounds, enhances the biodegradability of the Stage-2 influent.
A significant portion of the microorganisms present in the exponential growth phase, and low sludge detention period, promotes the development of dynamic community. The diversified sludge biological community increases the variety of organic compounds, which can be degraded in the stage-1, and keeps the process more stable and shock-avoidable.More than 80% of the organic compounds in the influent can be removed by the first stage.
Stage-2:The leftover organic matter is destroyed by biodegradation, during the Bio-oxidation stage, which is typically a low-loaded activated sludge process. This stage can be adjusted for nitrogen/phosphorus removal, by alternating aerobic, anoxic, and anaerobic zones in the reactor.
Wastewater treatment benefits using adsorption + bio-oxidation
- Low energy consumption resulting from 20% lower aeration costs, compared to a standard ASP plant.
- Low aeration requirements.
- 40% less space is needed in the aeration tank than in a single-stage ASP plant.
- Increasing sludge generation in the first stage, leads to an increase in biogas output in the digester.
- Concentrations of effluent are more constant.
Wastewater treatment drawbacks using adsorption + bio-oxidation
- If the C/N ratio is low, incomplete denitrification takes place in the second stage.
- High sludge production in the first stage is a disadvantage, if a WWTP is not engaged in anaerobic digestion of sludge, since it raises sludge treatment costs.
- High retention times for equipment expenditures results in a greater requirement for additional reactors.
Efficiency in removing nutrients
Nitrogen removal in the first stage can reach 30–40% because; nitrogen from organic compounds is integrated in up flow anaerobic sludge blanket (UASB) reactor sludge.
To eliminate phosphorus in the second stage, coagulation with ferric and aluminium salts, such as FeCl3 or Al2(SO4)3, can be utilized.
Industrial wastewater treatment applications
One of the most sophisticated and extensively used commercial separation techniques, for water purification is adsorption. It entails the interphase collection of dissolved adsorbates (pollutants) from an aqueous solution, onto the solid adsorbent surface. The surface area and the adsorbent have a direct relationship. In order to get rid of organic dyes, a variety of synthetic adsorbents have been tried, including activated carbon and natural clay particles.
The following industries traditionally employ the adsorption/bio-oxidation technique, to treat industrial effluent with high COD:
- Textile Industry
- Food/Dairy Industry
- Pharmaceutical Industry
- Leather Tanning Industry
- Paper and Pulp Industry
When used as an adsorbent in the industrial wastewater treatment process, active carbon must frequently be produced at a high temperature. If this cannot be done economically, it must be destroyed in an incinerator.
Manufacturers of Wastewater Treatment Plants in India
Netsol Water, based in Greater Noida, India, is a well-known manufacturer of water and wastewater treatment systems. We are well-known for being the top commercial RO plant manufacturers, industrial RO plant manufacturers, ZLD Plant manufacturer, sewage treatment plant manufacturers, Water Softener Plant Manufacturers, effluent treatment plant manufacturers, and much more.We employ various techniques in our wastewater treatment plants, which include aerobic/anaerobic processes, activated carbon, reverse osmosis, etc.