OUR MBBR PROCESS FLOW EXPLAINED
INFLUENT WASTEWATER: The first step in the process is to receive the influent wastewater from the municipal sewer system or industrial discharge. This wastewater is often screened to remove large debris and grit.
PRIMARY TREATMENT: The wastewater then undergoes primary treatment, which involves the removal of settleable and floating solids, as well as some organic matter. This is typically done in a settling tank or clarifier.
Within the secondary stage, the MBBR system comprises three distinct tanks:
MBBR REACTOR TANK FOR BOD REMOVAL: This tank is meticulously designed to effectively eliminate BOD (biological oxygen demand) from wastewater. It serves a crucial role in BOD removal by providing ample surface area for microorganisms to consume organic matter. This reactor typically contains more plastic media than the second MBBR reactor, optimizing surface area for biofilm formation. The biofilm functions as a natural filter, efficiently removing organic matter and other contaminants from the wastewater.
MBBR REACTOR TANK FOR BIO NUTRIENT REMOVAL (BNR): The second MBBR reactor, often positioned in series with the first, is primarily focused on removing bio-nutrients like ammonia, nitrate, nitrite, and phosphate from the wastewater stream. BNR is accomplished through a two-stage process: ammonia oxidation and nitrite oxidation. Avlon's design ensures specific factors, including Oxic SRT, MLSS, alkalinity, influent ammonia levels, and the presence of inhibitory compounds, are maintained for effective nitrification.
PRE/POST ANOXIC TANK FOR DENITRIFICATION: This tank is skillfully designed to facilitate denitrification, converting nitrate (NO3-) produced in the second MBBR reactor into nitrogen gas (N2), released harmlessly into the atmosphere. Denitrification occurs in low-oxygen conditions, and the process involves the introduction of a carbon source to stimulate denitrifying bacterial growth. Denitrifying bacteria, such as Paracoccus denitrificans, Pseudomonas denitrificans, and Thiobacillus denitrificans, utilize the carbon source as an electron donor, and nitrate as an electron acceptor, effectively converting nitrate to nitrogen gas.
FINAL CLARIFIER: The treated wastewater then undergoes final clarification to remove any remaining suspended solids or bacteria. This is typically done in a settling tank or clarifier.
DISINFECTION: Finally, the treated wastewater is disinfected to kill any remaining bacteria and viruses. This is typically done using chlorine, UV light, or ozone.
EFFLUENT DISCHARGE: The treated and disinfected wastewater, known as effluent, is then discharged into a receiving water body or reused for non-potable purposes, such as irrigation or industrial use.
