A2/O Wastwater Treatment Plant

Subject: A2/O Wastwater Treatment Plant

Dear sir,

 

 

 

anyway we are working in A2/O also.

 

It is necessary to introduce nitrogen and phosphorus removal processes in the  wastewater treatment plants  to improve the water quality . An A²/O (anaerobic-anoxic-oxic) process using immobilized media is proposed here, as a high-end technology to meet stricter discharge standards when faced with treatment space limitations. Fluidized immobilization media were added to the aerobic reactor to maintain a high concentration of nitrifying bacteria and nitrification rate. The process performs well for removal of nitrogen and phosphorus under the condition of HRT = 8 hr, it was possible to obtain an effluent water quality as follows: T-N<8.0 mg/L; T-P<1.0 mg/L.

 

Flow chart

                  1.3 Q return from Aerobic

                                  l

  Q In--- Anaerobic--Anoxic---Aerobic--Settling--- Out

                 l

          0.5 Q Return From Settling

 

 

A2/o process is basically adding of  Anoxic zone between Anaerobic and aerobic .

 

 

Dear Saleem   i am working in tender for sewage treatment plant, where consultant asking for carry the process calculation based on A2/O process technology, did you have any furthure information about this process plz help me

Membrane bio reactor the latest fad in waste water treatment

The Membrane Bio Reactor Technology is the most advanced development in the field of biological treatment providing treated wastewater for recycling in smaller footprint and under stringent discharge norms.

Hollow Fiber membranes are introduced to mixed liquor to separate treated effluent from mixed liquor. Membrane being the absolute physical barriers ensures complete removal of suspended impurities. MBR applications include even retrofits of existing systems as well as installation of new systems, for both meeting the most stringent discharge norms and reuse. Treated wastewater from MBR can be even reused for cooling tower make-up, to generate high purity water through Reverse Osmosis and other non-potable applications. This process can help environment protection by treating wastewater and making it suitable for variety of application and thus conserve precious drinking water. Biological system designed for MBR process operates at higher MLVSS concentration with higher sludge retention time thus produces a low quantum of biological sludge thus reducing the sludge dewatering cost.

Triveni in exclusive association with Memcor Australia, a part of US Filter of U.S.A., leader in total water management systems offer MBR Process. Memcor's MBR technology combines the skills of Memcor's membrane specialists and the biological treatment engineers at JetTech (another element of US Filter's global expertise) to deliver integrated treatment solutions with firm process guarantees such as BOD and TSS less than 5 mg/l and also removal of nutrient (nitrogen & phosphorous) coliforms.

Biological process fluid (mixed liquor) is pumped to the Membrane Operating System ("MOS"). The mixed liquor is introduced to membrane, along with air, evenly across the bottom of the tank through a unique two-phase jet system. This mixed liquor fills the membrane tank and flows upward through the membrane submodules, creating cross-flow dynamics across the membrane surface. This cross-flow continuously scours the membrane surface and prevent solids dehydration at the membrane surface. Applying a low-pressure vacuum to the inside of the membrane fiber pulls water through the membranes and pumps the filtered water to the next process step. Solids, including organics, bacteria, and most viruses, are rejected by the membrane system and retained in the mixed liquor, which overflows the MOS back to the aeration tank.

The Membrane Operating System is an assembly with integral membrane modules arranged in rack assemblies, inserted into the membrane tank.

MOS Mixed Liquor Distribution & Recirculation Jets are designed to distribute the air scour and mixed liquor flow evenly across the membrane submodules.

This feature eliminates potential polarisation (concentration) of suspended solids around the membrane fibers which could be main cause for the failure and damage of individual fibers thus submodules. Additionally, this feature provides even distribution of mixed liquor solids to each membrane unit, critical so that all membranes see the same process conditions. The return recirculation of mixed liquor ensures influent comes in intimate contact with the concentrated biomass, offering better organism selection and added flexibility in the anoxic cycle for advanced nitrogen removal, when required. This same jet system also acts as an integral part of the membrane cleaning system, providing an efficient scouring of the membranes with chlorine cleaning solution. The integrated cleaning system allows the submodules to be quickly cleaned in place. Additionally, the clean and efficient procedure eliminates the need for membrane removal from process tanks that can damage membranes and present risks to plant operators.

Relaxation, Maintenance and in situ CIP are exclusive features of Memcor's MBR Process to ensure consistent water quality and complete membrane life. The entire operation is PLC controlled.

Saleem Asraf Syed Imdaadullah
Mobile:9899300371
Envo Projects
311/22,Zakir Nagar,
New Delhi-110025 ,India
Email:saleemasraf@gmail.com
blog:  www.saleemindia.blogspot.com
Web Site : www.envo.8m.com

FMR Vs. SAFF

The FMR works on the same principle as the submerged fixed film process (SAFF) with only one exception - the media is not fixed and floats around in the aeration tank. The main advantage of this system over the submerged fixed film process is that it prevents choking of the media. Compared to conventional technologies the FMR is compact, energy efficient and user friendly. It also allows flexibility in design of the reactor tank. The advantages of the FMR are many –

• Attached growth process, with specially designed moving media.

• Compact and modular design. Requires less space
  

• Minimal pumping and chemical cost, low operating cost.
  

Fixed media in SAFF is very costly. Its called Bio Deck and sold at a rate of Rs.4000 per cu mtr at Delhi. So replacement or repair is a costly issue.

FMR is an advanced version of the SAFF which uses a floating media to avoid the practical choking problem of media in SAFF.

 

 

 

Saleem Asraf Syed Imdaadullah
Mobile:9899300371
Envo Projects
311/22,Zakir Nagar,
New Delhi-110025 ,India
Email:saleemasraf@gmail.com
blog:  www.saleemindia.blogspot.com
Web Site : www.envo.8m.com