What happens in the secondary wastewater treatment process?
Primary settling eliminates approximately half of the particles and one-third of the BOD from raw sewage.
The removal of biodegradable organic materials in solution or suspension and suspended particles, is referred to as secondary treatment. Disinfection is frequently included in the scope of traditional secondary treatment.
Let’s look at what happens in the secondary wastewater treatment process!
Biological processes are utilized in secondary treatment to remove dissolved and suspended organic materials, as determined by biochemical oxygen demand (BOD). Depending on the treatment technology, microorganisms carry out these actions in a controlled anaerobic or aerobic procedure.
When reproducing to create cells of biological solids, bacteria and protozoa ingest biodegradable soluble organic pollutants, such as sugars, fats, and organic short-chain carbon molecules from human waste, food waste, detergents, etc.
Biological Processes that help in secondary wastewater treatment
Aerobic Treatment: Systems for aerobic treatment turn organic pollutants into by-products like water, carbon dioxide, and more microorganisms.
Microorganisms having oxygen-dependent metabolic activities are used in this treatment. In aerobic treatment systems, oxygen is added to the wastewater by aeration, feeding the microorganisms that later consume the waste.
Activated Sludge Process: This procedure utilizes a sludge blanket consisting of clumped biosolids known as flocs, and uses both aeration and flocculation. These flocs develop during the aeration procedure and collect near the water tank's bottom.
Wastewater treatment plants utilize secondary clarifiers to combine settled sewage with raw or primary sludge, during the activated sludge treatment process. The flocs are then pumped back into the water inside the aeration tank using air compressors, to add compressed air to the mixture, allowing the microorganisms in the return sludge to break down additional waste. For this type of treatment, treatment facilities employ many techniques and tools:
· Surface Aerators
· Media Filters
Anaerobic Treatment: Without the need of oxygen, anaerobic processes transform organic pollutants into biofuel gas. This process frequently takes place in covered digestive lagoons and is completely devoid of air.
Anaerobic bacteria in the lagoons degrade organic waste. Because, oxygen is not pumped into the wastewater via machinery, the anaerobic process requires less energy than the aerobic method.
Water vapour, carbon dioxide, and methane are typical by-products of anaerobic wastewater treatment along with biogas. The resultant methane is frequently used by wastewater treatment facilities as plant fuel.
For plants that treat water containing concentrated levels of biodegradable elements, such as food waste, animal dung, or municipal waste, anaerobic treatment is excellent.
Manufacturer of wastewater treatment plants
Netsol Water is the leading manufacturer of water treatment and sewage treatment systems in India. We offer water softeners, wastewater treatment facilities, including those that use anaerobic wastewater treatment techniques, sewage treatment plants, water treatment plants, RO plants, and effluent treatment plants for use in a variety of industries.
For further information, contact us at +91 9650608473 or email at enquiry@netsolwater.com
