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The Effect of pH Variation in Biogas Production: Impact of Cocoa Pods and Empty Palmyra Palm Bunches

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Abstract

The main purpose of this work was to assess the influence of pH variation in biogas production and to study the effect of certain substrates (other than chemical products) on stabilizing production. Two substrates were used in production: banana peels (BP) and rumen scraps (RS). Five different mixing ratios were studied at a mesophilic temperature (35±2 °C): 25% RS+75% BP; 100% RS; 100% BP; 50% RS+50% BP and lastly 75% RS+25% BP. Substrate characterization parameters such as dry matter content, volatile dry matter content, pH, nitrogen-carbon ratio, biogas production and methane content were determined. A comparative study of the pH stabilization was then conducted using the mixtures (co-digestion) that obtained the best production results. Stabilizers included in particular potassium hydroxide (KOH), cocoa pods and empty Palmyra palm bunches. Biogas production varies with pH fluctuation. Indeed, it decreases whenever the pH value tends towards acidity. The best production was obtained at a pH of between 7.1 and 7.5. The use of cocoa pods as a pH stabilizer instead of KOH (chemical product) improved production by 24.48% and 0.11%, respectively, for the mixtures of 50% RS+50% BP and 25% RS+75% BP. Compared to KOH, empty Palmyra palm bunches had no positive impact. The findings showed that cocoa pods made it possible to stabilize the pH fluctuation and thus improve production performance. This improvement showed that cocoa pods could be used as a new stabilizer in anaerobic digestion systems.

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Data Availability

The datasets generated and/or analyzed during this study are not publicly available but are available from the corresponding author upon reasonable request.

Abbreviations

Btu:

British thermal units

BP:

Banana peels

CP:

Cocoa pods

CH4:

Methane

C/N:

Carbon/Nitrogen

TC:

Total carbon

RS:

Rumen scraps

KOH:

Potassium Hydroxide

DM:

Dry matter

VDM:

Volatile dry matter

PH:

Hydrogen potential

PP:

Empty Palmyra palm bunches

TN:

Total nitrogen

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Funding

This work was supported by the World Bank and financed by the AFD and carried out at the Institut National Polytechnique Felix Houphouët Boigny.

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Authors and Affiliations

  1. Laboratory of Industrial Processes, Synthesis of the Environment and New Energies (LAPISEN), National Polytechnic Institute Houphouët-Boigny, P.O Box 1313, Yamoussoukro, Côte d’Ivoire

    Oumoul-Kairou Karidio Daouda Idrissa & Benjamin Yao Kouassi

  2. National Centre for the Development of Technologies, Ministry of Scientific Research and Innovation (CNDT/MINRESI), PO Box1457, Yaounde, Cameroon

    David Tsuanyo

  3. Laboratory of Thermodynamics and Physico-Chemistry of the Environment (LTPCM), Training and Research Center, Faculty of Fundamental and Applied Science (UFR-SFA), Nangui Abrogoua University, 02 BP 801, Abidjan 01, Côte d’Ivoire

    Adjoumani Rodrigue Kouakou

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  1. Oumoul-Kairou Karidio Daouda Idrissa
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  3. Adjoumani Rodrigue Kouakou
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All authors contributed to the design of the study. The preparation of the material, data collection, and analysis were done by KDIO-K. The manuscript was written by KDIO-K and all authors commented on previous versions of the manuscript. All authors have read and approved the final manuscript.

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Correspondence to Oumoul-Kairou Karidio Daouda Idrissa.

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Karidio Daouda Idrissa, OK., Tsuanyo, D., Kouakou, A. et al. The Effect of pH Variation in Biogas Production: Impact of Cocoa Pods and Empty Palmyra Palm Bunches. Waste Biomass Valor 14, 2267–2274 (2023). https://doi.org/10.1007/s12649-022-01997-2

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