Development of an in-line process viscometer for the full-scale biogas process

Area of Science:

• Biotechnology
• Chemical Engineering
• Materials Science

Background:

• Biogas slurry rheology is crucial for efficient plant operation and transport.
• Traditional viscometers require sample pretreatment, limiting real-time analysis.
• Understanding rheological properties aids in process optimization and equipment design.

Purpose of the Study:

• To develop and validate an in-line viscometer for real-time biogas slurry rheology.
• To investigate the impact of feedstock characteristics on slurry rheological behavior.
• To determine the suitability of the Power-Law model for describing biogas slurry flow.

Main Methods:

• Development of an in-line viscometer for direct measurement at a full-scale biogas plant.
• Analysis of rheological properties under varying feedstock structures and total solid (TS) content.
• Evaluation of the effect of mechanical feedstock disintegration on viscosity.

Main Results:

• The Power-Law model adequately describes the flow curves of biogas slurries.
• Increased use of fibrous materials in feedstock leads to higher slurry viscosity.
• A rise in total solids from 10.1% to 15.1% caused a significant increase in viscosity.
• Mechanical disintegration of feedstock improved rheological properties, particularly at higher TS.

Conclusions:

• The developed in-line viscometer is effective for characterizing biogas slurry rheology without pretreatment.
• Feedstock composition and processing significantly influence slurry viscosity and flow behavior.
• Optimizing feedstock characteristics and disintegration can enhance biogas plant efficiency.