A SIGNIFICANT ROLE OF BIOMASS ATTACHED-ZONE ON PERFORMANCE AND STABILITY OF ANAEROBIC HYBRID REACTOR UNDER HYDRAULIC SHOCK LOADS

May 16th, 2012

A SIGNIFICANT ROLE OF BIOMASS ATTACHED-ZONE ON PERFORMANCE AND STABILITY OF ANAEROBIC HYBRID REACTOR UNDER HYDRAULIC SHOCK LOADS

Yusron Sugiarto1, 2, Pratin Kullavanijaya3*, Pawinee Chaiprasert1*
(1)    King Mongkut’s  University of Technology Thonburi (KMUTT), School of Bioresources and Technology, Bangkhuntien, Bangkok 10150, Thailand
(2)    Brawijaya University, Agro-industrial Biotechnology, Malang 65144, Indonesia
(3)    King Mongkut’s  University of Technology Thonburi (KMUTT), Pilot Plant Development and Training Institute, Bangkhuntien, Bangkok 10150, Thailand
*Corresponding author: Tel: 02 470 7526; Fax: 02 452 3455
E-mail: pratin@pdti.kmutt.ac.th; pawinee.cha@kmutt.ac.th

ABSTRACT
Biomass retaining capability is a key factor governs the success of the biogas digester operation, particularly under an imbalanced-loading situation. In this case, a novel anaerobic hybrid reactor (AHR) contains both suspended and attached-growth is developed. In this study, the contributed role of biomass attached-zone on performance and stability of AHR under hydraulic shock loads were investigated. After achieving stable operation, at loading rate of 4.0 kg COD/m3.d, retention time (HRT) of 3.0 d and COD removal efficiency of 95-98%, AHR was consequently subjected to transient loads via HRT reduction from 3 to 2 d for 8 to 72 h; with constant influent concentration. The results demonstrated a significant role of the biomass attached-zone to tolerate the hydraulic transient loads. The contribution of this zone in overall soluble COD removal was gradually increased from 3.1 to 10.2%. During each loading, a temporary inhibition depicted as a fluctuation of pH, COD and acid accumulated was clearly found at the middle part of digester. However, these parameters stayed favorable for the effluent. Biomass washout was also limited during all operation. AHR could recover from each temporary inhibition and resumed normal operation within 1.0 d. The system performance and stability was maintained. This was attributed to the biomass attached-zone. This finding clearly demonstrated the important of the attached-zone to be a main part for maintaining digester stability and biomass recovery.

Keywords: Anaerobic hybrid reactor, Attached-zone, hydraulic shock load, performance, stability

One Response to “A SIGNIFICANT ROLE OF BIOMASS ATTACHED-ZONE ON PERFORMANCE AND STABILITY OF ANAEROBIC HYBRID REACTOR UNDER HYDRAULIC SHOCK LOADS”

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