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Continuously-stirred Anaerobic Digester to Convert Organic Wastes into Biogas: System Setup and Basic Operation

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A proof-of-concept experimental study for vacuum-driven anaerobic biosolids fermentation using the IntensiCarb

Frances Okoye¹, Farokh Laqa Kakar¹, Elsayed Elbeshbishy¹

¹Environmental Research for Resource Recovery Group, Department of Civil Engineering, Ryerson University, Toronto, Canada.

Water Environment Research : a Research Publication of the Water Environment Federation

|March 4, 2022

Summary

This study introduces IntensiCarb, an innovative anaerobic technology that decouples solids and hydraulic retention times (SRT and HRT) for enhanced municipal biosolids treatment and resource recovery.

Keywords:

fermentation intensification resource recovery sludge treatment thickening vacuum evaporation

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Published on: July 13, 2012

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Published on: August 15, 2019

Area of Science:

Environmental Engineering
Anaerobic Digestion
Biosolids Treatment

Background:

Municipal biosolids treatment faces challenges with optimizing solids and hydraulic retention times (SRT and HRT).
Conventional anaerobic systems often struggle with efficient particulate hydrolysis and nutrient partitioning.

Purpose of the Study:

To demonstrate the potential of the IntensiCarb technology for intensifying anaerobic treatment of municipal biosolids.
To evaluate the impact of decoupling SRT and HRT on particulate hydrolysis, VFA production, and nutrient partitioning.

Main Methods:

Proof-of-concept experiments using a mixture of primary sludge and waste-activated sludge.
Comparison of intensified continuously stirred anaerobic reactors (CSARs) with a conventional control system.
Utilizing vacuum evaporation to decouple SRT and HRT in the IntensiCarb unit.

Main Results:

The IntensiCarb technology achieved full decoupling of HRT and SRT, with intensification factors of 1.3 and 2.
An intensification factor of 2 led to a 65% improvement in particulate solubilization.
Approximately 50% of total ammonia was extracted without pH adjustment, while carbon was retained in the fermentate.

Conclusions:

IntensiCarb technology enables significant plant-wide intensification in water resource recovery facilities.
The system facilitates nutrient partitioning into separate streams (particulate, fermentate, condensate) for value-added product recovery.
IntensiCarb offers a simplified approach to biosolids treatment, combining thickening, digestion, and partial dewatering in a single unit.