Biotechnology combined with mobile microbial media MBBR is a combination of two processes of circulating activated sludge and the process of immobilizing microorganisms by a mobile microbial substrate.
Figure 1: Diagram of wastewater treatment by MBBR biotechnology.
The anoxic zone (AX) is responsible for the denitrification process.
The aerobic zone AEROBIC is responsible for BOD treatment, performing the nitrate process.
The settling tank (Clarifier) is responsible for sedimentation, making in wastewater.
Advantages of the option:
Ensure the wastewater treatment capacity after the system reaches level B of the standard QCVN 14:2008/BTNMT – National technical regulation on domestic wastewater.
The ability to design wastewater treatment plants in stages: That is to add and increase the efficiency of the work by using more microbial media.
The biomass was added without increasing the sludge in the second settling work.
The process is highly efficient while using a smaller building volume than traditional technology.
Solve the stabilization of sludge concentration.
Reduce the generation of sludge to be treated generated in the construction site.
Simultaneously perform the process of nitrate and denitrification.
Improve the resilience of the building in the event of a failure.
Disadvantages of the option:
The cost for the microbial media consumed.
There are some additional items such as the microbial support blocking system.
The wastewater treatment technology line according to the selected option includes the following treatment stages:
Description of project items:
Biotechnology combined with MBBR mobile microbial media using mobile microbial media:
Grease tank: remove grease, hydrocarbons before flowing to the conditioning tank.
Septic tank: Simultaneously performing 2 functions: settling and decomposing sediment.
Conditioning tank: Receiving wastewater, regulating the flow of wastewater. At the conditioning tank, there is a flow-regulating pump system that operates according to the signal of the water level indicator. The raw aeration system supplies air to the conditioning tank to stabilize the concentration of pollutants, partially reduce pollutants, and prevent anaerobic decomposition from occurring in the building to contribute to minimizing odors emitted to the outside of the building. submit.
Anoxic biological tank: Synthetic treatment of pollutants containing Nitrogen and Phosphorus. Here, the process of reducing NO3– to N2 gas takes place in an anaerobic environment, NO3– plays the role of accepting Electron. Bacteria gain energy for growth from converting NO3– into N2. In anoxic tanks with a coarse aeration system installed, this system is responsible for mixing activated sludge with wastewater but maintaining DO content in the treatment tank area at < 0.3 mg/l. The coarse aeration system does this because of the intermittent aeration mechanism, with the large size of the bubbles, which reduces the ability to dissolve oxygen into the air.
Aerobic tank combined with mobile microbial media MBBR: Remove suspended sediments, separate sludge, make water, synthesize organic matter. MBBR mobile microbiological media increases the ability to handle organic substances, nitrates ammonium and reduces the volume of tank construction compared to conventional treatment works. The fine foam gas distribution system is installed under the treatment tank to increase the efficiency of oxygen dispersal into the water. This amount of oxygen is responsible for directly oxidizing organic matter, a part of the remaining oxygen is responsible for mixing the activated sludge with wastewater.
Sedimentation tank: The task of settling sludge, doing in the water after the aerobic tank. Vertical settling tank design, suitable for the capacity of the station. The central settling pipe and water divider are made of lightweight stainless steel, durable in wastewater environment.
Disinfection tank: The task of disinfecting wastewater, removing pathogenic bacteria present in wastewater before being discharged into the environment. The treated water meets QCVN 14:2008/BTNMT column B and is discharged directly into the receiving source.
Pressure filtration system: gravel + sand filter task to remove and completely adsorb small-sized solids that are not separated from wastewater after settling. The pressure filter column is equipped with an Auto Valve system that operates fully automatically, minimizing the amount of labor to operate the system. Wastewater from the washing and filtering process will be collected in the conditioning tank, and the sludge is settled below.