Overhead aerial of the four-digester bank at the Circle CBG Meerut plant, adjacent sugarcane field visible

Technology

Mesophilic digestion. Membrane upgrading. Certified compression.

A purpose-built CBG line engineered around proven process equipment, sized for 96–97% methane purity at 250 bar dispatch.

Producing CBG for sale since August 2024 · scaling to 24 TPD by November 2026

96–97% CH₄

CBG product purity, above BIS 16087 spec

250 bar

Dispatch pressure for cascade loading

4 → 6 digesters

CSTR mesophilic, ramping to six by November 2026

2-stage membrane

Hollow-fibre membrane upgrading

Aerial oblique view of the Circle CBG Meerut plant on its 12-acre Bahadurpur site — The plant from the air. Digesters, dewatering hall, and pressmud pad on a 12-acre site among the surrounding farmland.

Feedstock receiving and preparation

Pressmud arrives by truck and trolley from regional sugar mills within a ~60 km radius of the plant. Cattle manure is collected from local dairies and goshallas across Meerut District. Both are weighed at the on-site weighbridge and blended with borewell water in equalisation tanks to a target ~12% solids slurry.

Anaerobic digestion

The conditioned slurry feeds covered mesophilic digesters operating around 30 °C. Continuous mixing keeps solids in suspension while micro-organisms break down organic matter into raw biogas, captured under double-membrane gas holders.

Pre-treatment and gas cleaning

Raw biogas passes through desulfurisation vessels for H₂S removal, then through chilled heat exchangers and an activated-carbon polishing bed to drop moisture and trace VOCs to membrane-safe levels.

Membrane upgrading to pipeline-quality CBG

A two-stage hollow-fibre membrane skid separates methane from CO₂, lifting CH₄ from ~60% in raw biogas to 96–97%+ in the product stream, well above the BIS 16087 specification for vehicle-grade CBG.

Compression, storage, and dispatch

A multi-stage high-pressure compressor train fills an on-site stationary cascade and mobile cascades for delivery across the National Capital Region under SATAT, with cascade-based injection into city-gas pipelines. Digestate is dewatered into fermented organic manure (FOM/LFOM) sold to farmers.

Double-membrane digester gas holder with foam-offtake piping at the Meerut plant — A double-membrane digester. Raw biogas collects under the gas holder as micro-organisms break down the slurry.

A digester gas holder with feed and gas piping at the Meerut plant — One of the digesters at site. Four digesters in use today, ramping to six by November 2026.

Biogas blowers and gas-cleaning pipework on the process pad at the Meerut plant — Gas-cleaning blowers. Raw biogas moves through desulphurisation and polishing before membrane upgrading.

Overhead view of a single digester dome at the Circle CBG Meerut plant — A single digester from above. Four digesters in use today, ramping to six by November 2026.

Biogas flare stack beside the gas-handling shed at the Meerut plant — The biogas flare. A safety device that burns off surplus or off-spec gas when needed.

Biogas flare with adjacent sugarcane field at the Circle CBG Meerut plant — The flare on the edge of the site, sugarcane field beyond. Pressmud comes from sugar mills like the one whose crop borders the plant.

Hydrogen-sulphide removal vessels at the Meerut plant — H₂S removal vessels. First-stage gas cleaning before membrane upgrading.

Feed-gas compressor for membrane upgrading at the Meerut plant — Feed-gas compressor. Boosts cleaned biogas to membrane feed pressure.

Two-stage hollow-fibre membrane upgrading skid at the Meerut plant — Two-stage hollow-fibre membrane upgrading skid. Separates CH₄ from CO₂.

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