Impact of trace element additives on anaerobic digestion of sewage sludge with in-situ carbon dioxide sequestration

Abstract

Please cite this article as: Linville Jessica L, Shen Yanwen, Schoene Robin P, Nguyen Maximillian, Urgun-Demirtas Meltem, Snyder Seth W.Impact of trace element additives on anaerobic digestion of sewage sludge with in-situ carbon dioxide sequestration.Process Biochemistry http://dx. 2 Graphical abstract Highlights: Evaluated trace element addition during anaerobic digestion of sewage sludge  Olivine was used for in-situ CO2 sequestration to produce renewable methane  Olivine and 1.5 mg/L Ni and Co addition increased the methanation kinetics by 6-56%  Lab bench tests achieved up to 56% increase in methane yield  Simultaneously, lab bench tests resulted in up to 17.3% increase in methane volume 3 Abstract Anaerobic digestion (AD) of sludge at wastewater treatment plants can benefit from addition of essential trace metals such as iron, nickel and cobalt to increase biogas production for utilization in combined heat and power systems, fed into natural gas pipelines or as a vehicle fuel. This study evaluated the impact and benefits of Ni/Co and olivine addition to the digester at mesophilic temperatures. These additions supplement previously reported research in which iron-rich olivine (MgSiO4) was added to sequester CO2 in-situ during batch AD of sludge. Trace element addition has been shown to stimulate and stabilize biogas production and have a synergistic effect on the mineral carbonation process. AD with 5% w/v olivine and 1.5 mg/L Ni/Co addition had a 17.3% increase in methane volume, a 6% increase in initial exponential methane production rate and a 56% increase in methane yield (mL CH4/g CODdegraded) compared to the control due to synergistic trace element and olivine addition while maintaining 17.7% CO2 sequestration from olivine addition. Both first-order kinetic modeling and response surface methodology modeling confirmed the combined benefit of the trace elements and olivine addition. These results were significantly higher than previously reported results with olivine addition alone [1].

Applicability of Rice Husk Residue Generated by the Silica Extraction Process to Anaerobic Digestion for Methane Production

“…The short-chain carboxylic Although the pH of the mixed liquid in the BMP bottles was not adjusted in this study, it was maintained at 7.3-7.7 during AD. Considering that the optimal pH range for methanogenesis is between 6.2 and 8.0 [34], we assumed that the pH should not be an issue in our AD tests.…”

On-site CO2 bio-sequestration in anaerobic digestion: Current status and prospects

“…Currently, physio-chemical methods for biogas upgrading, such as water scrubbers, chemical scrubbers, pressure swing adsorption, and membrane separation are prevailed due to their high level of technology readiness (Allegue et al, 2012;Lemmer et al 2015;Sun et al, 2015). However, these technologies may cause methane losses of 0.1-8% and increase biogas production costs by 20-72% due to the high operating pressure, electricity demand, or chemical/water requirements (Linville et al, 2016). Thus, the renewable energydriven carbon capture and utilization of CO 2 from green sources is a strategic approach for CO 2 mitigation.…”

Three-Stage Anaerobic Sequencing Batch Reactor (ASBR) for Maximum Methane Production: Effects of COD Loading Rate and Reactor Volumetric Ratio

“…Sufficient quantities of nutrients are needed for both high bacterial activity and growth in anaerobic digestion [31]. Apart from the macronutrients N and P, trace elements (micronutrients), such as Co, Cu, Fe, Mo, Mn, Ni and Zn, are also essential for the metabolic activity of anaerobes [32][33][34].…”