COMPARISION AMONG ASP, MBBR, SBR AND MBR

 

COMPARISION AMONG ASP, MBBR, SBR AND MBR 

 

Technology	ASP	MBBR	SBR	MBR
Aeration Unit	Needs a Big Aeration Tank with surface aerators or diffused aeration.	Floating media is used providing a surface for microbial growth	Operates in batch where waste water is added to the reactor, treated and discharges.	Normal biological treatment like MBBR
Settling Unit	Uses a Common circular Settling Tank	A tube settler is used for high sludge removal rate.	NIL	Membrane filtration process in place of Settler.
Efficiency	Average Efficiency	High Treatment efficiency. Robust against fluctuation flow and load	Flexibility in Treatment. High Nutrient removal	Superior effluent quality due to membrane barrier.
Area	Largest Area	Most compact system	Requires less area than ASP	50% less area then SBR
Uses	Used in Municipal waste water treatment plant	Used in Decentralized waste water treatment plant and Industries.	Suitable for smaller STP. It has some constraints in Municipal waste water treatment plant	Used in Decentralized waste water treatment plant and Industries, especially when plant is to be designed for zero discharge.
Cost	Medium Cost EASY TO MAINTAIN	Lowest capital and maintenance cost, EASY TO MAINTAIN	High maintenance cost	High Energy Load, Maintenance cost 20% lower than SBR

 

ENVO COMPACT MBBR STP sewage treatment plant

THE ENVO COMPACT MBBR STP

STP FLOW CHART

                              PLEASE WATCH THE VIDEO

ENVO IS WORKING IN THIS FIELD SINCE 1994. 

An introduction to MBBR (moving bed biofilm reactor )/ FM Reactor/ FAB /FMR Reactor sewage treatment plant (STP)

THIS PLANT IS USED TO TREAT DIRTY WASTE WATER COMING OUT FROM ANY PLACE BEFORE RELEASING IT TO DRAIN. GOVERNMENT DOES NOT ALLOW UNTREATED DIRTY WASTE WATER TO BE RELEASED TO DRAIN DIRECTLY WITHOUT TREATMENT, IT IS CALLED WATER POLLUTION.

WHERE THIS PLANT IS REQUIRED

   1. Land development-housing colony, hotels,Restaurants, resorts, office      complexes,Multistory Buildings, Malls

   2  Schools,College, Hostel, Hospitals,Nursing Home, 

   3.Parks, other recreational areas

   4.  Rail Station,Public places 

   5.Biological treatment for industrial effluent

CHARACTERISTICS OF DIRTY WASTE WATER COMING TO STP:
pH --8
TSS--300 ppm
Oil & Grease --50 ppm
BOD--250 ppm
COD 650 ppm

CHARACTERISTIC OF TREATED WATER GOING OUT OF STP TO DRAIN

pH --8

TSS--less than 100ppm
Oil & Grease --less than 10 ppm
BOD--less than 30 ppm
COD less than 250 ppm

ENVO COMPACT MBBR STP  is a complete unit, pre-piped, pre-wired and ready to install. Engineered to serve with minimal maintenance, and designed to meet the requirements of the state water quality agency. Epoxy or other chemically resistant coatings, together with dependable accessory equipment assure long life and low maintenance cost. And the best part is the resale value. These total units can be re-located to serve again.

Features of COMPACT STP

o   Pre-engineered and prefabricated structure

o   Easily transported to the site

o   Modular design allows easy installation

o   Simple operation-less manpower required

o   User friendly-low maintenance

o   Long service life,

o   Custom designed

o   Efficient process, REDUCES BOD LOAD BY MORE THAN 80%

o   World-class finishing

o   Sludgecan be used as manure for horticulture purpose

o   Branded electrical/mechanical equipments used

o   Good resale value

The Process of Treatment

Primary Treatment (DEWATS/Collection tank before COMPACT MBBR)

In primary treatment, floating and suspended solids are settled and removed from sewage by bar screen. Following this, discharge from the sewers enters a DEWATS/collection chamber .

Secondary Treatment (COMPACT MBBR )

This is the next level treatment where the bacteria in sewage are used for further purification of the sewage. It’s a biological process that removes about 85% or more of the organic matter in sewage compared with primary treatment, where the purification level is about 50%. These processes are variations of what is called the "Activated Sludge" process, which provide a mechanism for bacteria, with air added for oxygen, to come in contact with the wastewater to purify it.

In the activated sludge process, flow from the sewer goes into the reactor, where compressed air is mixed with sludge in the presence of synthetic media on which the purifying organisms grow and contact the wastewater, removing contaminants in the process. The activated sludge allows bacteria to feed on the "food" provided by the new wastewater in the reactor, thus purifying it.

The flow, along with excess organisms that build up on the media during the purification, then goes to a Tube Settler. Air flows up through the media in the filters, to provide necessary oxygen for the bacteria organisms. Clarified effluent flows to the receiving water, typically a river , after disinfection. Excess sludge is produced by the process and after collection from the bottom of the tube settler it is dewatered, sometimes after mixing with primary sludge, for use as fertilizer, disposed of in a landfill, or incinerated.

Tertiary Treatment

Advanced level of water treatment is called tertiary treatment of water - where heavy metals, toxic chemicals and other pollutants are removed from wastewater to an altering degree. The tertiary treatment methods include micro filtration, carbon adsorption, evaporation/distillation, and chemical precipitation.

Civil Works:1.DEWATS(Collection tank),2..SDB,3.Treated water tank 4.Foundation for compact

SPECIAL FEATURE OF OUR DESIGN:

We provide two-stage treatment. DEWATS is the first stage treatment. Because of DEWATS, the blower capacity is reduced in the second stage of MBBR treatment thereby reducing the maintenance cost during running of the STP..

Electro Mechanical Components Involved COMPACT MBBR STP

Bio Reactor (MBBR) Double stage

Tube Settler

Raw sewage Pump

Air Blower ,Rotary type

Filter feed Pump

Sludge Pump

Dual media Filter

Activated Carbon Filter

Electrical Items

Pipe & Fittings

Erection commissioning of the system

         

The Treated water can be reused for horticulture, road washing etc without any further treatment.

ENVO PROJECTS ,NEW DELHI, 09899300371, 08076071358

www.facebook.com/envoprojects

HOW TO DESIGN A STP USING MBBR FBBR FMR TECHNOLOGY

An introduction to MBBR (moving bed biofilm reactor )/ FM Reactor/ FAB /FMR Reactor wastewater treatment

When communities of microorganisms grow on surfaces, they are called biofilms. Microorganisms in a biofilm wastewater treatment process are more resilient to process disturbances compared to other types of biological treatment processes.  Thus, biofilm wastewater treatment technologies can be considerably more robust especially when compared to conventional technologies like activated suldge process..

In the MBBR biofilm technology the biofilm grows protected within engineered plastic carriers, which are carefully designed with high internal surface area. These biofilm carriers are suspended and thoroughly mixed throughout the water phase. With this technology it is possible to handle extremely high loading conditions without any problems of clogging, and treat industrial and municipal wastewater on a relatively small footprint.

System description

The MBBR™ biofilm technology is based on specially designed plastic biofilm carriers or biocarriers that are suspended and in continuous movement within a tank or reactor of specified volume. The design of associated aerators, grids, sieves, spray nozzles and other integral parts to the reactor is also of great importance in making up the system as a whole .

The industrial and municipal wastewater is led to the MBBR™ treatment reactor where biofilm, growing within the internal structures of the biocarriers, degrade the pollutants.  These pollutants that need to be removed in order to treat the wastewater are food or substrate for growth of the biofilm.  The biocarrier design is critical due to requirements for good mass transfer of substrate and oxygen to the microorganisms  .  Excess biofilm sloughs off the biocarrier in a natural way .

An aeration grid located at the bottom of the reactor supplies oxygen to the biofilm along with the mixing energy required to keep the biocarriers suspended and completely mix within the reactor.

Treated water flows from reactor through a grid or a sieve, which retains the MBBR™ biocarriers in the reactor. Depending on the wastewater, the reactors are may be equipped with special spray nozzles that prevent excessive foam formation.

The MBBR is a biological aerobic degradation of organic pollutants. The process utilizes millions of tiny, polyethylene biofilm elements that provide a high surface area as a home for a vast, highly active bacteria culture. This fixed film process features a flexible reactor design, the ability to handle load increases without the need for extra tankage, and remains stable under large load variations, including temperature, strength or pH. Like the activated sludge process, the MBBR process utilizes the whole volume of an open tank. Unlike an activated sludge reactor, it does not require sludge return to operate effectively. In MBBR , addition of media quantity and Air Quantity is the Key Factor.

Total reactor volume of the MBBRs is designed for different hydraulic retention time for different types of waste water at average flows and than checked against peak flows. Essentially nutrient levels and DO levels are the only control points for the system.

Moving Bed Biofilm Bioreactor (MBBR) process uses the whole tank volume for biomass growth. It uses simple floating media, which are carriers for attached growth of biofilms. Biofilm carrier movement is caused by the agitation of air bubbles. This compact treatment system is effective in removal of BOD as well as nitrogen and phosphorus while facilitating effective solids separation.

Design and Construction Principles

Neutralised and settled wastewater passes through MBBR for reduction in BOD/COD. Most of the MBBR plants are provided with vertically or horizontally mounted rectangular mesh sieves or cylindrical bar sieves. Biofilm carriers are made up of high density (0.95 g/cm³) polyethelene. These are normally shaped as small cylinders with a cross inside and fins outside. The standard filling of carrier is  not more than 465 m²/m³. Generally, design load for COD-BOD removal is 20 g COD / m²d. Smaller carriers need smaller reactor volume at a given loading rate (as g/m²d) when the carrier filling is same. 

It is advisable to use MBBR in combination with a DEWATS  as a pre-treatment unit, depending on the local conditions and input characteristics. It is a very robust and compact alternative for secondary treatment of municipal wastewater, having removal efficiency for BOD 90 – 95% (low rate) and that of 75 – 80% for high rate. Average nitrogen removal is about 85%. There is no need for sludge recirculation. Phosphorus and faecal coliform reduction is feasible with additional passive (non-mechanical) or active (mechanical) system components.

A constantly operating MBBR does not require backwashing or return sludge flows. It has minimal head-loss. Coarse-bubble aeration in the aeration zone in the wastewater treatment tank provides ease of operation at low-cost. Agitation continuously moves the carrier elements over the surface of the screen thus preventing clogging. Maintenance of MBBR system includes screening, influent equalisation, clarifier system, sludge handling and integrated control system. There is no need to maintain f/M ratio as there is self-maintenance of an optimum level of productive biofilm. Skilled labour is required for routine monitoring and operations of pumps and blowers.

Calculations!:Aeration Tank Volume, HRT, MLSS Values.

I am working in a STP & ETP plant. I need to know how to calculate: 1. Volume of Aeration tank 2. HRT 3. F/M Ratio 4. MLSS value. The relevant details of the ETP are as below: Influent flow = 10 m3 / day In. flow BOD = 1200 mg / L In.flow COD = 2200 mg / L TSS  = 850 mg / L   Jeyaroopa   jeyaroopa79@gmail.com Dear Jayroopa You may please refer Water & Waste Water Engineering by Metcalf & Eddy. BOD of effluent is 1200 mg/l. It will be difficult to bring down the BOD by Activated Sludge process to desire permissible limits. Simplified method of calculation is as below. Process Activated sludge Flo3, CUM 10 Type Extended aeration Food to Microorganism ratio (F/M) 0.15 Total BOD load, Kg BOD*Flow/1000.= 12 Total mixed liquor suspended solids(MLSS) Total BOD/(F/M) = 80 kg MLSS in Tank say mg/l 3000 Volume of tank, CUM Total MLSS/(MLSS/1000) = 26.6 Retention time, hr 24*Volume of Tank/Flow = 63.84 You can select F/M & MLSS values and optiimise the volume of a tank. The waste water has high suspended solids therefore sedimentation is must. Maximum efficiency of Activated sludge process is 95% therefore if you need lower value of BOD in treated effluent then you have to opt two stage process. For further information please contact Prof. R. V. Saraf Director Viraj Envirozing India Pvt. Ltd. 21 Radhakrishna Near SBI, Paud Road, Pune 38 watersgs@vsnl.net 13 Aug, 2008   |  Taral Kumar Dear Jeyaroopa, Though the calculation is not that simple, I will give you a thumb rule. Multiply BOD with Quantity of effluent and divide it by 500 to get aeration tank volume. For example, for 10 cum/day with 1200 BOD, aeration tank volume shall be 10 x 1200 / 500 = 24 cum. That is 2.5 days storage nearly. But that is because the BOD is excessively high. With best regards, Taral Kumar Executive Director Akar Impex Pvt. Ltd. Noida, Uttar Pradesh http://www.indiawaterportal.org/Network/askq/kb/?View=entry&EntryID=343

Moving Bed Biofilm Bioreactor (MBBR) -Design and Construction Principles of FMR

Moving Bed Biofilm Bioreactor (MBBR) process uses the whole tank volume for biomass growth. It uses simple floating media, which are carriers for attached growth of biofilms. Biofilm carrier movement is caused by the agitation of air bubbles. This compact treatment system is effective in removal of BOD as well as nitrogen and phosphorus while facilitating effective solids separation.

Design and Construction Principles

MBBR units are placed in series based on the load entering each reactor. Neutralised and settled wastewater passes through MBBR for reduction in BOD/COD. Most of the MBBR plants are provided with vertically or horizontally mounted rectangular mesh sieves or cylindrical bar sieves. Biofilm carriers are made up of high density (0.95 g/cm³) polyethelene. These are normally shaped as small cylinders with a cross inside and fins outside. The standard filling of carrier is below 70% with a maximum specific area not more than 465 m²/m³. Generally, design load for COD-BOD removal is 20 g COD / m²d. Smaller carriers need smaller reactor volume at a given loading rate (as g/m²d) when the carrier filling is same. 

It is advisable to use MBBR in combination with a septic tank, DEWATS or a pre-coagulation step as a pre-treatment unit, depending on the local conditions and input characteristics. It is a very robust and compact alternative for secondary treatment of municipal wastewater, having removal efficiency for BOD 90 – 95% (low rate) and that of 75 – 80% for high rate. Average nitrogen removal is about 85%. There is no need for sludge recirculation. Phosphorus and faecal coliform reduction is feasible with additional passive (non-mechanical) or active (mechanical) system components.

A constantly operating MBBR does not require backwashing or return sludge flows. It has minimal head-loss. Coarse-bubble aeration in the aeration zone in the wastewater treatment tank provides ease of operation at low-cost. Agitation continuously moves the carrier elements over the surface of the screen thus preventing clogging. Maintenance of MBBR system includes screening, influent equalisation, clarifier system, sludge handling and integrated control system. There is no need to maintain f/M ratio as there is self-maintenance of an optimum level of productive biofilm. Skilled labour is required for routine monitoring and operations of pumps and blowers.

You always need expert advise to design a efficient and cost effective system.

	ITEMS OF ENVO COMPACT MODULE
Sr No	Item	Specification	Qty	Cost
1	Raw Sewage Pump	Submersible,auto running,kirlosker	1 No
2	Compact module consisting of following units,. 1.Aeration-I with aeration grid 2.Aeration-II with aeration grid 3.Tube settler with baffle and weir 4.Treated water tank 5.Sludge holding tank with aeration	MS with support frame, inside FRP, outside painted	LOT
3	Diffuser in Aeration Tank-I & II	Dome type,Make:ENVO	LOT
4	Floating Media in aeration tank-I & II		LOT
5	Tube Deck Media in Tube Settler		LOT
6	Air Blower,	Twin lobe Rotary type, Make: SGN	1 No
7	Filter Feed Pump	Kirlosker	1 No
8	Pressure sand  filter	MS module with media and frontal pipes and valves,Make:ENVO	1No
9	Activated carbon filter	MS module with media and frontal pipes and valves,Make::ENVO	1No
10	Electric starters,wires	Panel,starter  and wires to pump and blowers	LOT
11	Pipe & Fittings, PVC	PVC pipe and fittings	LOT
12	Sludge Pump	kirlosker pump	1 No
13	Filter Press	PP plates with filter cloth, Make:Saraswati	1 No
14	Erection commissioning of the system		LOT