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Biological hydrogen production from sterilized sewage sludge by anaerobic self-fermentation

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Abstract.
Due to richness in proteins and carbohydrates, the sewage sludge produced from the wastewater treatment
processes is becoming a potential substrate for biological hydrogen production. In this study,
sterilized sludge was employed to produce hydrogen by batch anaerobic self-fermentation without any
extra-feeds and extra-seeds. Sterilization can screen hydrogen-producing microorganisms from sludge
microflora and release organic materials from microbial cells of sludge. Experimental results suggested
that sterilization could accelerate and increase the hydrogen production of sewage sludge in the anaerobic
self-fermentation, and the biogas did not contain methane. The hydrogen yield was increased from
0.35mLH2/g VS (raw sludge) to 16.26mLH2/g VS (sterilized sludge). Although sterilization could fully
inhibit the activity of methanogens in the sludge, the hydrogen consumption still occurred in the anaerobic
self-fermentation of sterilized sludge due to the existence of other hydrogen-consuming actions.
The decrease of pH in the anaerobic self-fermentation of sterilized sludge was very lower (from 6.81
to 6.56) because NH4+ produced by degradation of proteins could neutralize organic acids produced in
the process. The soluble chemical oxygen demand (SCOD) increase of sterilized sludge was higher than
that of raw sludge. Volatile fatty acids (VFA) were the important by-products and acetate was the major
composition. The hydrogen fermentation of carbohydrateswas the major source of hydrogen production.

Keywords:
Anaerobic self-fermentation
Hydrogen production
Sterilization
Sewage sludge

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Informasi Detail

Judul Seri

Journal of Hazardous Materials

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Journal of Hazardous Materials 168 (2009) 163–167

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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