Introduction – MBR Technology

MBR (Membrane Bio-Reactor) can be broadly defined as systems integrating biological degradation of wastewater with membrane filtration. 

Set up of MBR plant is mainly utilizing a bioreactor and membrane filtration as one unit process for wastewater treatment thereby replacing, and in some cases supplementing, the solids separation function of secondary clarification and effluent filtration, resulting the possibility to eliminate the secondary clarification and operate at higher MLSS concentration. 

In summary, the MBR system is the combination of traditional Activated Sludge Treatment with the membrane technology. The design criteria of the system shall be base according to the traditional way of Activated Sludge Treatment principle. However, on top of that, the MBR modules are immersed and located in the air blow tank/ aeration basin (biological reactor tank), the clear water is pumped (sucked) out from the MBR modules. This shall possibly eliminate the needs of secondary clarifier. 


Features of the MBR: 

▪	Better control of biological activity
▪	Effluent that is free of bacteria and pathogens
▪	Smaller foot print
▪	Biodegradation efficiency enhanced 20%~40%
▪	Short Hydraulic Residence Time (HRT) & Long Sludge Residence Time (SRT)
▪	Activated sludge increase by 2~3 times				
▪	Higher organic loading rates
▪	Adopt high strength polypropylene material membrane, easy cleaning, long lifespan to 3-5 years. 
▪	Convenient management with automatic control system. 

How does it work: 

▪	3 pcs. of membrane are connected parallel through the header to form a frame. Connected frame network will form a Membrane Unit. 
▪	It is then connected the suction side of a permeate pump, the membranes are subjected to a slight negative pressure of 10 to 30 kPa (1.5 to 4.5 psi).
▪	In an “outside-in” process operation, water is drawn from the mixed liquor through the membrane module and into the hollow fiber, further enhanced by suction effect of pump. From there, the treated water is drawn through the header and out through the discharge system. 
▪	On a continuous basis, air is pumped into the bottom header, where it emerges as a fine bubble stream. This air stream performs the triple role of process aeration, mixing of the biomass and membrane cleaning. Refer Diagram 1.
▪	Also, with the continuous movement of air bubbles around and through the fibers, a lower concentration of biomass is maintained around the membranes and this, in turn, minimizes the potential for membrane fouling.
▪	The membrane module are modular design and can be dismantled individually for manual cleaning as part of supplementary periodic maintenance. 




Sewerage Treatment Plant – Forecasted Result & Suggested Treatment Flow



Particles and solids will be separated mechanically from the sewage wastewater when flowing through the bar screen. Then the effluent through balance tank flows into anoxic (hydrolytic) and aeration tank for further bio-degradation process. 

After the bio-degradation process in the MBR tank, the effluent is directly sucked out via the Membrane module which are immersed in the same tank, which is why known as Membrane Bio-Reactor. Effluent from this Membrane Bio-reactor is consistent in quality as membrane is an effective barrier against suspended solids and microorganism. This will prevent losses of bacteria to the next stage and always maintain the F/M (Food/Micro-organism) ratio low, which will allow bio-degradation process happen effectively and lower the HRT and increase the SRT.

DELIVERY SCHEDULE 
Delivery Period will start from date of receipt of Technically & Commercially clear Purchase Order 
Drawings will be provided for approval within a week after receipt of request from you and you will Provide drawing approval within 1 week. 
In case you have any comments/observations or any change required on Drawing submitted for approval, please get back to us within 7 days else we will presume that drawings are in order and shall be released for production. Any delay in approval of drawings by you beyond one week or any time taken to redo the drawings after approval until re¬-approval, the delivery will be extended accordingly. 
Delivery starting on Ex¬ works basis 	: 	10-12 weeks	

Rs. 5000/Head/ Day (8 hours) will be charged for supervision for Erection & Commission and all accommodation (Lodging & Boarding) will be extra or  in client scope
 Though erection and commissioning is performed by client and client request from us to be present in time commissioning. is payable.
STANDARD TERMS AND CONDITIONS
SPECIFICATIONS 
Specifications, dimensions, design, description, shades of paint etc are not binding on us in minute details and are subject to reasonable alteration / change without notice. 
INSPECTION 
If necessary, the goods will be offered for inspection at our works/our supplier’s works. The date of inspection will be intimated about one week in advance. If inspection is not carried out on the date mentioned, we shall be free to dispatch the equipment as per the terms of delivery. 
If payment is not made within 15 days from the date of Performa Invoice, we reserve the right to divert the ordered material. We will give fresh delivery period and new price at the time of diversion which will be binding on the purchaser and contract cannot be rendered void on this account.  If the goods are not diverted, charges for storage, insurance and interest at 1% of the Invoice value each week/part thereof commencing 15 days from the date of Proforma Invoice will be charged. Warehousing charges are subject to a maximum of 5% of the Invoice value.
WARRANTY
The equipment supplied by us shell be warranted for 12 months from the date of installation and commissioning or 18 months from the date of supply for any manufacture defect, however defect arise due to miss handling, incorrect operation wear and tear shell be entertained with reasonable charges. The warranty of all instruments and pump and motor and other equipment except prefabricated items will be covered under actual manufacturer’s warranty conditions. 
HANDOVER 
Unless and otherwise specified in the order and accepted, handing over of the equipment and / or installation would be considered as completed and a formal completion certificate shall be issued by the purchaser / user. 
The equipment/system, to be supplied by us, shall be site erected and commissioned at purchaser’s site. 
This equipment/system shall be legally transferred to the buyer only after realization of full and final payment. 
MODE OF DELIVERY 
The goods may be dispatched in one or more lots at our option. If we are required to dispatch the goods on behalf of customer, we can arrange to do so on freight to pay basis on the understanding that no liability is attached to us. In such case, Freight charges contracted by us on behalf of the purchaser shall be final and binding on the purchaser. 
CANCELLATION 
Order received and acknowledged by us shall not be subject to cancellation, either wholly or partly for any reason whatsoever without our written consent. 
FORCE MAJEURE 
The order from the purchaser is subject to force majeure by which it means, such as war, invasion, civil disobedience, govt. orders or restrains, strike, lockout, riots, fire, epidemics, sabotages, trade embargoes, earthquakes, floods, accidents, breakdown of machines, delay or inability to obtain labour, raw material, wagons, shipping space or any other process, which is beyond our and our supplier’s control. 

JURISDICTION 
All contracts between purchaser and ourselves are deemed to have entered into in DELHI and are therefore subject to the Jurisdiction of Courts in DELHI. 

Excluded

Extra as per actual or in customer's scope

Battery Limit:-  From Collection/Equalization Tank  Up to  Out let of MBR Tank
Thickness of MS Plate shall be 5mm
Aeration Grid shall be in GI (B Class) while submerged lines shall be UPVC
All interconnecting lines shall be UPVC (40 schedule) upto 200KLD, interconnecting pipe lines shall be MSEP (B class) more than 200KLD 
Earthling/electrical/civil or not included in specification, shall be in client/customers scope