SBR is an activated sludge wastewater treatment system for removing dissolved and suspended organic materials and nutrients.  In SBR all the unit operations such as aeration, settling and decanting are achieved in a single reactor.
SBR CYCLES


	FILLING PHASE 


	AERATION PHASE


	SETTLING PHASE

 
	DECANT PHASE

SBR BENEFITS

•	Reduced capital cost: Single integrated bioreactor concept reduces auxiliary equipment and built-up land requirement.

•	Reduced operating and maintenance costs: The high level of automation results in reduced supervision requirements, contributing to lower operating and maintenance costs. 

•	Nutrient reduction: High treatment efficiency includes biological reduction of nitrogen and phosphorus and reductions of BOD5 and TSS too less than 10 mg/l.  

•	Less excess sludge and stabilized: Low microbiological loading results in longer sludge age, significantly less excess sludge production, and its stabilization. After heat treatment for pathogens (in some cases directly) the sludge may be used as fertilizer. 

•	No odor: Aerobic conditions throughout the bioreactor and extended sludge age dramatically reduce the potential for odor. Plants can be located in the vicinity of populated areas without any ill effect. 

•	Modular and flexible design: Ensures that plants meeting current needs can be quickly expanded if and when growth demands. A variety of construction materials are used and plant components can even be retrofitted into existing tanks. 

•	Improved sludge dewatering: Extended sludge age improves its structure and mechanical dewatering characteristics. 

•	Proven: Literally hundreds of plants in operation worldwide. 


EFFICIENCY OF SBR 
	Frequent alteration of factors allows enrichment of a variety of microbial strains
	Exploitation of metabolic capabilities of various strains is achieved
	Bacteria maintain high metabolic rate even in low substrate concentration

PROCESS DESCRIPTION  
Screening:-
The sewage will be taken into a bar screen chamber for removal of floating materials such as grass, polythene bags etc. A manual type coarse bar screen will be provided for separation of floating materials. The screened Sewage is collected in collection sump then pumped into the SBR Tank by means of sewage transfer pump where Aeration, Clarification & Decanting of Sewage takes place.
 
Aeration, Clarification & Decanting:- 

We are proposing Sequential Batch Reactor, wherein in one reactor the sewage undergoes the unit operations of Aeration, Settling and Decanting. A write up on the same is given below for your reference. 
Sequencing Batch Reactors actually represent a very elementary form of treatment process known as “Fill and Draw”. Wastewater added to a reactor is treated to remove undesirable components, and is subsequently discharged.  The SBR reactor is a self-contained system incorporating equalization, aeration and clarification, aeration and clarification within the confines of a SINGLE basin.

The SBR uses the latest biomass conditioning technology.  This enables the SBR system to attain nutrient control without the addition of chemicals and to out perform continuous “flow through systems.

SBR process is similar to an Activated Sludge Process.  The major advantages are:
	Improved sewage qualities,

	The elimination of separate clarifier and sludge return pumps,

	Increased settling area (the total reactor area is used for settling),

	A perfectly quiescent settling environment,

	Elimination of short circuiting,

	A special ability to handle extremely high organic and hydraulic shock load,

	The capability to equalize flows and loads. 

Choice of Food / MLSS ratio

Although the F/M ratio in the SBR system continually changes during the Fill and React phases, the average values are comparable to those in activated sludge systems.  Currently most installed SBR systems are based on low load design, (in order to obtain a high degree of BOD removal and nitrification), typically with a F/M ratio of 0.05 to 0.15 kg BOD/kg MLSS.  This is comparable to an extended aeration type process. Conventionally loaded activated sludge systems operate in the range of 0.15 – 0.40 kg BOD /kg MLSS, depending on the requirements for discharge.  SBR can also be designed in this designed in this range but the higher the F/M ratio, the higher the excess sludge production and a decreasing nitrification and stabilization.  High rate systems are particularly useful as industrial pre-treatment applications where removal of the BOD is not possible in one treatment step.
Operation 
Normally the process follows the basic steps of; AERATE, SETTLE and DECANT.  The actual cycle time will vary with the effluent results desired.  
If only BOD reduction is desired, a cycle time as 3 hours may be used. If further treatment, to obtain nitrification/Denitrification f. e. is required, the cycle time can be extended to accommodate the process requirements.
The AERATE phase in the SBR system is typically timed controlled and can be adjusted depending on the required removal efficiency.  The AERATE phase is followed by the SETTLING PHASE.  The settling represents the quiescent phase during which no aeration or mixing occurs and is also time controlled.  The last step is the DECANT step represents the quiescent phase during which no aeration or mixing occurs and is also time controlled.  The last step is the DECANT step representing the discharge of clarified effluent controlled by level in the reactor.
Aeration phase 		        : Depending on capacity
Settling Phase 			: Normally 45 minutes to 60 min
Decant phase 			: Reduction from maximum to minimum level within 60 min
The clarified Sewage then flows into the Filter Feed Sump from where it is pumped into the MM Filter. Disinfection of sewage will be done by using Hypochlorite solution. For this Hypochlorite tank and dosing pump will be provided.

The sludge in the SBR Tank is removed by means of Sludge Transfer Pumps to SDB/Filter Press.

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 Tertiary Treatment
Interconnecting pipe lines are included
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