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Comparison of digestors

Comparison of Digestors

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

Comparison of Plant and machinery

Comparison of Plant and Machinery

S.No Parameter HIT OTHERS Advantages of HIT
1 Plant Capacity From 1200 to 10000 kgs of Bio-CNG From 1200 to 10000 kgs of Bio-CNG 20% of less space required than others.
2 Pretreatment HIT developed a technology for the pre-treatment of input raw material to hydrolyze which reduces the main Digester volume considerably There is no Pre-treatment process for the input raw material. By using Hydrolysis technology input raw material like Poultry litter, Napier Grass and any type of Agriculture waste can be converted in to Bio-gas.
3 Main Digester MDBR CSTR- 75-100 Hp power required for mixing. There is no mechanical mixing system.  Hence no power is required for stirring process inside the digester.
4 Slurry outlet system Slurry collected in overhead tanks which is connected tothe Decanter separatesthe solids in the slurry by gravity. Sludge pumps are required for pumping the slurry in to decanter. No power required for slurry pumping
5 Bio-Gas Storage 10% of the total produced Bio-gas will be stored by using floating multi domes. Remaining 25% of the produced gas will be sorted in the balloon Imported single fixed dome will be used to store the produced Bio-gas. Local made FRP domes and Balloon will be used which reduces the cost up to 50% when compared with others.
6 Scrubbing Process PSA Scrubbing processer is used for the removal of CO2. PSA or Water Scrubbing methods will be used. Purification system will be monitored through SCADA system in printing mode.
7 Compressor 250 bar compressor with VFD system. Ordinary Compression systems are used. Power consumption will reduce automatically in the co-processing phase due to in sufficient gas for compression by adopting Auto Cutoff system and VFD
8 Bottling Bio-CNG will be stored in Cylinders with 200-250 bar pressure. Bio-CNG will be stored in Cylinders with 200-250 bar pressure. Compatible.
9 Power consumption 110 kw power required for 2400kgs capacity plant. 200kw power required for 2400kgs capacity plant. 95 kw power will be saved
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HIT – Haritham Innovative Technologies LLP

Guntur, Andhra Pradesh, India-522002.