Performance comparison of uninsulated and insulated hybrid anaerobic baffled reactor (HABR) operating at warm temperature

Abstract

In this research, a hybrid anaerobic baffled reactor (HABR) configuration was proposed consisting of a front sedimentation chamber and four regular baffled chambers followed by two floated filter media chambers for the treatment of domestic wastewater. Performance comparison of uninsulated and insulated HABRs was carried out operating at warm temperature (18.6–37.6 °C) under variable HRTs (30 h and 20 h). The study suggests that almost similar chemical oxygen demand (91% vs 88%), total suspended solids (90% vs 95%), turbidity (98% vs 97%), and volatile suspended solids (90% vs 93%) removal efficiencies were obtained for uninsulated and insulated HABRs. Higher removal of total nitrogen (TN) of 41%, NH4+-N of 44%, and NO3−-N of 91% were achieved by the insulated HABR compared to TN of 37%, NH4+-N of 36%, and NO3−-N of 84% by the uninsulated HABR, whereas lower PO43− removal efficiency of 17% was found in the insulated HABR compared to 24% in the uninsulated HABR. This indicated insulation increased nitrogen removal efficiencies by 4% for TN, 8% for NH4+-N and 7% for NO3−-N, but decreased PO43−removal efficiency by 7%.

A simplistic approach of algal biofuels production from wastewater using a Hybrid Anaerobic Baffled Reactor and Photobioreactor (HABR-PBR) System

“…However, once HABR (I) recovered this situation and ran for an addition 100 d at 20 h HRT (except system idle for 42 days), higher PO 4 3- removal 50±22% was achieved by HABR (I) compare to 40±23% in HABR (U). It indicated that the insulation of HABR also increased PO 4 3- removal efficiency when operated for a longer time (140 d), which opposed to recent findings operating for a shorter time (e.g., 50 d)[45].…”

“…The average NH 4 + -N removal efficiency was 42±36% in HABR (U), and 47±42% in HABR (I). The recent study showed that the insulation of HABR increased NH 4 + -N removal by 7%[45], where the both HABRs were operated for 50 d (40 d for 30 h HRT, and 10 d for 20 h HRT). It was also observed that NH 4 + -N removal primarily occurred due to nitrification, which was observed high on day 18 and then gradually decreases afterward.…”

“…The results showed unstable phosphate removal in both reactors, Kishida et al[46] have reported similar findings from their study. The recent study showed that the insulation of HABR decreased PO 4 3- removal by 7%[45], where the both HABRs were operated for 50 d (40 d for 30 h HRT, and 10 d for 20 h HRT). It was found that the PO 4 3- removal was ceased late after 35 d in HABR (I) (instead 20 d in HABR (U)) because of biological phosphorus release by fermentative bacteria by producing fatty acids resulting higher phosphate concentration in the effluent.…”

Performance of Anaerobic Baffled Reactor for Decentralized Wastewater Treatment in Urban Malang, Indonesia

“…Surprisingly, the average oxygen content increased from an average of 2 mg/L to 4 mg/L in inlet and outlet respectively. Khalekuzzaman and his co-worker also reported that dissolved oxygen was higher in the effluent [35]. This indicates oxic/anoxic conditions occur in ABR for organic biodegradation and nitrification/denitrification processes [29].…”

Temperature analysis of a novel MAIB reactor during the treatment of wastewater from recycled paper mill

“…A key aspect influencing the AD process is the operating temperature (Khalekuzzaman et al 2018). Increasing or decreasing temperatures may affect the biological reaction rate or digestion performance within the ABR (Ali et al 2019;Chang et al 2020).…”