Engineering India's Cleanest Biogas Infrastructure
Multi-Stage Thermophilic Anaerobic Digestion, VSA pressure-swing enrichment, and a SATAT-aligned supply chain — built for industrial-grade reliability and measurable environmental impact.
Multi-Stage Thermophilic Anaerobic Digestion
Our proprietary MSTAD process operates at 52–55 °C across four sequential reactor stages, maximising volatile solids destruction and biogas yield from mixed agri-industrial feedstocks.
Feedstock Pre-treatment
Incoming biomass — press mud, agri-residue, food waste — is shredded, homogenised, and slurried to 8–12 % total solids. Tramp metal and inert material are removed via trommel screening.
Hydrolysis & Acidogenesis
Stage-1 CSTR reactor at 52 °C breaks complex polymers (cellulose, hemicellulose, proteins) into soluble monomers and volatile fatty acids. HRT: 3–5 days.
Acetogenesis & Methanogenesis
Stages 2–4 operate as plug-flow digesters with internal recirculation. Acetogenic and methanogenic consortia convert VFAs to CH₄ and CO₂. Biogas yield: 0.45–0.55 m³/kg VS destroyed.
Digestate Separation
Effluent passes through a screw-press separator. Solid fraction (25–30 % DM) is composted into FOM/PROM. Liquid fraction is treated and recycled as process water, achieving near-zero liquid discharge.
VSA Pressure-Swing Enrichment
Raw biogas (55–65 % CH₄) is upgraded to CBG meeting IS 16087:2023 specifications using Vacuum Swing Adsorption — the most energy-efficient upgrading technology at our scale.
H₂S & Moisture Removal
Iron-oxide scrubber + silica-gel desiccant columns reduce H₂S to < 5 ppm and dew point to −40 °C before the VSA beds.
CO₂ Adsorption (VSA Beds)
Zeolite 13X molecular sieve beds selectively adsorb CO₂ under near-atmospheric pressure. Vacuum regeneration at 0.05–0.1 bar desorbs CO₂ for optional utilisation.
CH₄ Polishing
Product gas passes through a final activated-carbon guard bed, achieving CH₄ ≥ 96 %, CO₂ ≤ 3 %, O₂ ≤ 0.5 % — fully compliant with IS 16087:2023.
Compression & Cascade Filling
CBG is compressed to 200 bar via a 4-stage reciprocating compressor and dispensed via priority/sequential cascade panels into Type-1 and Type-4 cylinders.
CBG Quality Specifications — IS 16087:2023
| Parameter | Value | Standard |
|---|---|---|
| CH₄ purity | ≥ 96 % | IS 16087:2023 |
| CO₂ content | ≤ 3 % | IS 16087:2023 |
| H₂S | < 5 ppm | IS 16087:2023 |
| Moisture (dew point) | −40 °C | IS 16087:2023 |
| Filling pressure | 200 bar | IS 15935 |
| Methane slip | < 0.5 % | Internal |
SATAT National Programme Alignment
Shaw AgriVolt Gas is structured to operate as a SATAT-registered Compressed Biogas producer, supplying directly to Oil Marketing Company (OMC) offtake networks.
OMC Offtake Agreement
CBG produced at our Howrah plant is eligible for purchase by Indian Oil, BPCL, and HPCL under the SATAT scheme at notified prices, providing a sovereign-backed revenue floor.
Letter of Intent (LOI) Framework
We operate under a binding LOI with an OMC, securing minimum offtake volumes and enabling long-term capacity planning and project financing.
MNRE & MoPNG Compliance
Plant design, safety systems, and gas quality protocols conform to MNRE guidelines for biogas plants and MoPNG's CBG technical standards, ensuring uninterrupted regulatory clearance.
Priority Sector Financing
SATAT registration unlocks priority-sector lending from NABARD, SIDBI, and scheduled commercial banks, reducing our cost of capital and enabling competitive CBG pricing.
SATAT (Sustainable Alternative Towards Affordable Transportation) is a Government of India initiative under MoPNG targeting 15 MMT/year of CBG production by 2030 from 5,000+ plants. Shaw AgriVolt Gas is positioned as an early-mover SATAT producer in West Bengal, benefiting from first-mover OMC relationships and state-level biomass aggregation networks.
ESG Impact Metrics
Every tonne of biomass processed generates measurable, third-party-verifiable environmental and social value.
GHG avoided per kg biomass processed
Liquid discharge to water bodies
Digestate valorised as certified fertilizer
UN Sustainable Development Goals addressed
Gas quality standard — full compliance
Fertilizer Control Order — certified products
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Download our full process dossier — P&ID diagrams, gas quality certificates, SATAT registration documents, and ESG impact reports.