Bio CNG/CBG Plant

Bio CNG / CBG Plant Manufacturer & Turnkey Project Solutions Provider in India/Globally.

Precious Enertech Pvt. Ltd. provides engineering, equipment supply and turnkey project solutions for Bio CNG / Compressed Biogas (CBG) plants. We support customers from project feasibility and feedstock assessment through process engineering, plant design, equipment supply, installation, commissioning and technical support.

Our Bio CNG / CBG solutions are developed according to feedstock characteristics, required production capacity, site conditions, utilities and customer requirements. We provide project solutions for suitable agricultural residues, cattle dung, napier grass, sugarcane press mud, food waste and other biodegradable organic feedstocks, subject to technical evaluation and feedstock suitability.

What is a Bio CNG / CBG Plant?

A Compressed Biogas (CBG) plant converts suitable biodegradable organic feedstock into biogas through a biological process known as anaerobic digestion. The raw biogas is then treated and upgraded to reduce unwanted components and moisture, producing methane-rich gas suitable for compression and use as a gaseous fuel, subject to applicable quality standards and regulatory requirements.

A typical CBG project includes feedstock receiving and preparation, anaerobic digestion, raw biogas collection, gas cleaning, biogas upgrading, gas drying, compression, high-pressure storage and CBG dispensing or dispatch systems.

CBG projects can also provide a productive use for suitable organic waste while generating useful digestate or other by-products, depending on the selected feedstock and process configuration.

Our Bio CNG / CBG Plant Solutions

Precious Enertech provides project-oriented Bio CNG / CBG solutions for different types of suitable organic and agricultural feedstocks. The final plant configuration is selected after evaluating feedstock availability, feedstock characteristics, required CBG capacity, site conditions and project objectives.

• Agricultural Waste-Based CBG Plant
• Napier Grass-Based CBG Plant
• Cattle Dung-Based CBG Plant
• Sugarcane Press Mud-Based CBG Plant
• Paddy Straw-Based CBG Plant
• Maize Silage-Based CBG Plant
• Food Waste-Based CBG Plant
• Dairy Waste-Based Biogas / CBG Plant
• Organic Waste-Based CBG Plant
• Suitable Mixed-Feedstock CBG Plant

CBG Plant Capacity Solutions

Bio CNG / CBG plants can be developed in different capacities depending on the availability and characteristics of feedstock and the required gas production.

Typical Project Capacities: 3 TPD | 5 TPD | 6 TPD | 10 TPD | 15 TPD | 20 TPD+

The final plant capacity and configuration should be established through detailed technical evaluation of feedstock quantity, TS/VS characteristics, organic loading, expected biogas production, methane potential, process conditions and required CBG output.

Bio CNG / CBG Plant Process

A typical Bio CNG / CBG production process consists of several integrated stages. The exact process configuration may vary according to feedstock and selected technology.

1. Feedstock Receiving: Suitable organic and agricultural feedstock is received, weighed, stored and prepared for further processing.
2. Feedstock Preparation: Depending on the feedstock, size reduction, shredding, mixing, slurry preparation, homogenisation or other suitable pre-treatment may be carried out.
3. Feeding System: Prepared feedstock is transferred to the digestion system through suitable pumps, feeders, conveyors or other material-handling equipment.
4. Anaerobic Digestion: Prepared organic material is processed under controlled anaerobic conditions to produce raw biogas.
5. Raw Biogas Collection: The generated biogas is collected and transferred to the gas treatment section.
6. Biogas Cleaning: Raw biogas is treated to reduce contaminants such as hydrogen sulphide, moisture and other impurities according to the selected process configuration.
7. Biogas Upgrading: The treated biogas passes through an upgrading system to reduce carbon dioxide and other unwanted components and produce methane-rich gas.
8. Gas Drying & Conditioning: The upgraded gas is conditioned according to the requirements of the downstream compression and application system.
9. CBG Compression: Methane-rich gas is compressed using a suitable high-pressure CBG compression system.
10. CBG Storage & Dispatch: Compressed Biogas is stored in suitable high-pressure storage systems and supplied, transported or dispensed according to the project application and applicable requirements.
11. Digestate Management: The remaining digested material is handled, separated, stored or utilised according to its characteristics and the project's planned by-product management system.

Major Equipment in a Bio CNG / CBG Plant

A complete Bio CNG / CBG plant consists of multiple integrated mechanical, electrical, process and automation systems. Equipment selection depends on feedstock, plant capacity, process technology and site requirements.

Feedstock Handling & Preparation

• Feedstock Receiving System
• Feedstock Storage System
• Conveyors
• Solid Feeders
• Shredders / Size Reduction Equipment
• Mixers
• Homogenisation System
• Slurry Preparation System
• Feed Pumps

Anaerobic Digestion & Biogas Production

• Anaerobic Digesters
• Digester Mixing / Agitation System
• Gas Holders
• Raw Biogas Collection System
• Biogas Blowers
• Digestate Handling System
• Digestate Separation System

Biogas Cleaning & Upgrading

• H₂S Removal System
• Gas Cooling System
• Gas Drying System
• Gas Filtration
• Biogas Upgrading System
• CO₂ Removal System
• Gas Quality Monitoring System

CBG Compression & Storage

• CBG Compressor
• High-Pressure Gas Storage
• CBG Cascade
• Gas Filling / Dispensing System
• High-Pressure Piping
• Valves & Safety Systems
• Pressure & Gas Monitoring Systems

Electrical & Automation

• PLC Control System
• MCC / Electrical Panels
• Instrumentation
• Process Monitoring
• Gas Detection & Monitoring
• Automation & Control System

Common Feedstocks for Bio CNG / CBG Plants

Bio CNG / CBG plants can use a wide range of biodegradable organic materials. The suitability of a feedstock depends on its availability, moisture content, total solids (TS), volatile solids (VS), biodegradability, methane potential, seasonal availability, transportation cost and pre-treatment requirements. Different feedstocks can also be combined where technically suitable.

1. Napier Grass

Napier grass is a biomass feedstock that can be considered for anaerobic digestion and CBG production. It may be suitable for projects where a reliable and economical supply of biomass is available. Depending on the selected process, size reduction and other pre-treatment may be required before digestion.

2. Cattle Dung

Cattle dung is a commonly used feedstock for biogas and CBG projects. It can be collected from dairy farms, cattle farms and gaushalas. Its suitability for a particular project depends on quantity, moisture content, collection system, transportation distance and other feedstock characteristics.

3. Sugarcane Press Mud

Sugarcane press mud is an organic by-product of sugar mills and can be used as a feedstock for biogas and CBG production. Its availability near sugar-processing facilities can make it suitable for location-specific CBG projects. The actual gas yield and process requirements depend on the characteristics of the available press mud.

4. Paddy Straw

Paddy straw is an agricultural residue with potential for CBG production. Because it is a lignocellulosic biomass, appropriate pre-treatment and feeding arrangements may be required to improve its digestibility and process performance.

5. Maize Silage & Agricultural Biomass

Maize silage and other suitable agricultural biomass can be considered for anaerobic digestion where sufficient feedstock is available. Feedstock quality, harvesting practices, storage, transportation and seasonal availability should be evaluated before selecting the material for a commercial CBG project.

6. Food & Organic Waste

Suitable segregated food and organic waste can be processed through anaerobic digestion to generate biogas. Proper segregation and removal of plastics, metals, glass and other non-biodegradable materials are important for reliable plant operation.

7. Dairy & Animal Waste

Dairy and animal waste can be considered for biogas and CBG projects. The project design should consider daily waste generation, collection arrangements, moisture content, transportation and the required pre-treatment and feeding system.

8. Suitable Mixed Feedstock

Two or more suitable feedstocks can be considered together when their characteristics are compatible with the selected anaerobic digestion process. Mixed-feedstock projects can help improve feedstock availability and process stability, but the final combination should be established through technical evaluation.

Feedstock Selection for a CBG Project

Choosing the right feedstock is critical for the technical and commercial performance of a Bio CNG / CBG plant. A feedstock should not be selected only on the basis of its theoretical biogas potential. Availability, delivered cost, seasonal variation, collection, transportation, storage, pre-treatment and digestate management should also be considered.

• Daily feedstock availability
• Total Solids (TS)
• Volatile Solids (VS)
• Organic matter and biodegradability
• Methane potential
• Moisture content
• C/N ratio
• Seasonal availability
• Collection and transportation requirements
• Pre-treatment requirements
• Feedstock storage requirements
• Digestate management

Feedstock Testing & Technical Evaluation

Before finalising a CBG plant configuration, the available feedstock should be evaluated for relevant physical, chemical and biological characteristics. Where required, laboratory testing and biochemical methane potential assessment can be used to support the project design and production estimation.

The actual feedstock requirement and CBG production should be calculated from the specific feedstock characteristics and selected plant technology rather than using a single standard conversion factor for all projects.

Feedstock Supply Planning

A reliable long-term feedstock supply chain is essential for continuous CBG plant operation. Project planning should consider the source of feedstock, collection method, daily quantity, seasonal fluctuations, transportation distance, storage facilities, procurement cost and backup feedstock arrangements.

Precious Enertech can evaluate the available feedstock and project requirements to help develop a suitable Bio CNG / CBG plant configuration.