CRA Powers Shiv Construction: Sludge to Sustainability

Shiv Construction required a biogas treatmentsystem capable of handling raw digester gas containing hydrogen sulfide andacidic components that pose corrosion and safety risks. The key challengesincluded:

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‍• Effective removal of H₂S under very low inletpressure conditions
• Fluctuating biogas composition typical of wastewater sludge digestion
• Requirement for consistent gas quality to protect downstream equipment
• Minimizing operator intervention through automation
• Safe operation within a potentially hazardous plant environment

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The system needed to deliver stable scrubbingper formance while maintaining simplicity, reliability, and operational continuity.

CRA designed and supplied a custom chemicalscrubber system optimized for wastewater biogas applications. The solutionfocused on efficient mass transfer, automation, and safe long-term operation.

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Core Components Delivered

• Packed-bed chemical scrubber column for enhancedgas–liquid contact
• Chemical dosing system with automated control
• Solenoid-actuated circulation and recirculation loops
• Integrated pH monitoring for real-time process control
• Skid-mounted piping, instrumentation, and control systems

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Engineering and Design

• Scrubber sizing and packing selection tailored to 400 Nm³/hr biogas flow
• Design optimized for low-pressure inlet conditions of 20–30 mbar
• Automated dosing logic to ensure consistent contaminant removal
• Safety-focused design suitable for hazardous operating environments

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Fabrication and Commissioning

• In-house fabrication and assembly of the scrubbersystem
• Factory checks of dosing, circulation, and control logic
• On-site installation and commissioning at the Behrampur WWTP
• Performance validation under live biogas operating conditions

• Reliable removal of hydrogen sulfide and acidicimpurities
• Improved biogas quality protecting downstream compressors and burners
• Stable scrubbing performance despite fluctuating gas composition
• Automated, unattended operation with minimal operator involvement
• Safe and continuous operation in a wastewater treatment environment

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This project demonstrates CRA’s capability todeliver reliable, automated biogas scrubbing solutions for municipal wastewaterapplications. By combining robust chemical scrubbing design with intelligentcontrol and safety-focused engineering, CRA enabled Shiv Construction toachieve consistent gas purification and long-term operational reliability. The installation reinforces CRA’s expertise in scalable biogas treatment systemsthat support sustainable wastewater-to-energy initiatives.