Effects of target pH-value on organic acids and methane production in two-stage anaerobic digestion of vegetable waste.

Abstract:

:Vegetable waste is one of the major organic residues available for sustainable bioenergy production. The aim of this work is to study the influence of pH-value on process stability, hydrolysis, degradation degree and methane production in two-stage anaerobic system. A mixture of vegetable wastes with carrot mousse, carrots, celery, cabbage and potatoes was treated in two-stage system at target pH-values 5.5 and 6 in acidification reactor (AR). At pH 6, high concentrations of organic acids were recorded whereas high amount of hydrolysate was produced at pH 5.5. The chemical oxygen demand (COD) concentration in the hydrolysate produced in AR was 21.85% higher at pH 6 compared to pH 5.5, whereas the overall specific methane yield was slightly higher at pH 5.5 (354.35±31.95 and 326.79±41.42Lkg-1 oDMadded, respectively). It could be shown, that the described two-stage system is well suited for manure-free digestion of vegetable waste.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Ravi PP,Lindner J,Oechsner H,Lemmer A

doi

10.1016/j.biortech.2017.09.068

subject

Has Abstract

pub_date

2018-01-01 00:00:00

pages

96-102

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(17)31633-4

journal_volume

247

pub_type

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