S.No

Specification

 MDBR

 CSTR

 Advantages of MDBR

1

Digester Design

 First time in India HIT developed MDBR (Multi Domes Bio-Gas Reactor) technology.

CSTR- (Continuous Stirred-Tank Reactor) 

 MDBR is the most advanced technology used for waste degradation and enhancement of biogas production. Easy to maintain without scum and chocking problem.

2

Technology

 It’s a unique design comprising of Multi Domes, Multi Chambers Multi Inlets & Outlets with expandable option Bio-Gas Reactor. 

 Single chamber with single inlet, outlet.

 There is no scum and chocking problem due to the unique design of the Digester which consists of multi inlets and multi outlets

3

Shape

 Square type 

 Vertical cylindrical shape

 Due to the square type design and size compatibility the Digester is expandable to our convenience.

4

Treatment Capacity

 100 Cum to any Capacity

 500 Cum to any Capacity

 Compatible.

5

Dome/ Top mounted digester
cover

Multi FRP Domes with upward and downward movements in the water seal.  

 Single non FRP Dome / Balloon.

 Installation of FRP Domes is much easier than Fixed Dome due to less weight. Zero maintenance up to  10 years when compared to non FRP domes

6

 Surface Area

Specialized bricks used for the construction of Baffled walls / Internal walls in the digester for the enhancement of surface
area and increasing the density of the microbial population.

 Bio-film used to increase the surface area.

 “Surface area” is the key factor for increasing Bio-Gas Production. More than 50% of the surface
area increased by constructing number of Baffle walls in the digester leading to the reduction in HRT and thereby reducing the volume of the digester.

7

Mixing 

 Bottom Mixing by using Pump

 Stirring constantly with
recirculation of the slurry and gas by using equipment like Agitators for mixing.

 Zero power consumption and less maintenance
due to the lack of movable equipment / machinery inside the digester.

8

Pre-treatment Method

 Primary Digester Technology was introduced for Aerobic hydrolysis of Raw material. 

 No Pre-treatment.

 Reduction in Digester volume up to 50 % and thereby reduces the cost of civil construction

9

HRT (Hydraulic Retention Time)

 20 days 

 35-40 days.

 HRT reduction due to the increase in the surface area because of increase in microbial density.

10

SRT (Solid Retention Time)

 80 %

 52%

 Slurry outlet solids is only 2% due to which bio-gas production will be increased by 15 – 20 %

11

Solids loading rate

10-12%

 10%

 Compatible.

12

Pressure relief valves

 Pressure relief valves are not required due to floating Domes.

 Pressure relief valves required due to fixed dome.

 Easy to handle &maintain

13

Gas Storage

 Gas storage increases up to 10% due to floating dome.

 Less Gas storage due to fixed dome.

 The size of the Bio-gas storage balloon reduced 

14

Patent

MDBR is a proprietary item of HIT-Patent Applied .

 Open technology

HIT will provide the technology and the necessary designs based on agreed terms and conditions