PERTANIKA JOURNAL OF TROPICAL AGRICULTURAL SCIENCE

 

e-ISSN 2231-8542
ISSN 1511-3701

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Anaerobic Digestion of Domestic Wastewater in different Salinity Levels: The Adaptation Process

Syazwani, Idrus, Nik Norsyahariati, Nik Daud and Amimul Ahsan

Pertanika Journal of Tropical Agricultural Science, Volume 25, Issue 1, January 2017

Keywords: Adaptation, chemical oxygen demand, inhibition, osmoregulation theory, specific methane production

Published on: 31 JANUARY 2017

The effect of osmotic stress was carried out to determine the resistance to salt toxicity using 4 Continuous Stirred Tank Reactor (CSTR). A CSTR digestion study revealed that digesters seeded with an inoculum from a conventional mesophilic digester treating municipal wastewater and fed on domestic wastewater (DW) plus salts were able to acclimate successfully to a final salt concentration of 10 g l-1. The digesters showed some disturbances during the acclimatisation period as indicated by reductions in specific methane production (SMP), specific biogas production (SBP), pH and increases in Intermediate Alkalinity /Partial Alkalinity (1A/PA) ratio and Volatile Fatty Acid (VFA) concentration. This study revealed the order of disturbance was Sodium Chloride (NaCl) > Potassium Chloride (KCl) > KCl + NaCl. The average values for SMP after stabilisation were below those in the controlled digester, at 0.335 (controlled), 0.323 (NaCl), 0.316 (KCl + NaCl) and 0.308 l CH4 g-1 COD added (KCl).

ISSN 1511-3701

e-ISSN 2231-8542

Article ID

JST-S0044-2016

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