Substrate removal kinetics of domestic wastewater treatment in a two-stage anaerobic system

Abstract

An investigation was done on the process kinetics of a two-stage (modified septic tank plus anaerobic filter) anaerobic bioreactor while treating actual domestic wastewater. The individual values of second-order substrate removal rate constant (k) for septic tank and anaerobic filter were observed as 0.36 and 0.26 per day respectively. It was 0.49 for the combined system.Maximum removal rate constant (U max ) and saturation value constant (K S ) were 737 and 934 mg/L/d respectively for anaerobic filter when modified Stover-Kincannon model was applied to this part of system. Both second-order and modified Stover-Kincannon models exhibited high correlation coefficents ( R 2 = 98-99%).

Performance and kinetic modeling of modified attached-growth anoxic-oxic-anoxic reactor for onsite sanitation system treating septic tank effluent

“…Table 3 comparison of the kinetic coefficients of various types of the attached-growth reactor. The μ max and K B for COD removal of this study were relatively higher than other studies such as up-flow anoxic-aerobic sludge reactor [13], up-flow aerobic-anoxic sludge bed reactor [24], integrated anaerobic-aerobic reactor [25], up-flow aerobic anoxic sludge fixed film [7], moving bed biofilm reactors [5,[26][27][28], biofilm processes [10,29], modified septic tank system [29], anaerobic-anoxic-aerobic moving bed bioreactors [20], and integrated rotating biological contactor-activated sludge system [31]. However, the values of μ max, and K B in this study were lower than those of the down-flow hanging sponge bioreactor by Nga [32], probably which used lower strength wastewater in their studies.…”

Model Estimasi Biokinetika Untuk Proses Post-Denitrifikasi Air Limbah Domestik Pada Unit Anaerobic Baffled Reactor

“…Beberapa penelitian lain berdasarkan tipe reaktor modifikasi anaerobic baffled bioreactor, high-rate anaerobic contact reactor,full-scale biogas-lift reactor (BLR), anaerobic contact reactor dengan aliran kontinu, completely-mixed up-flow anaerobic sludge blanket, dan bioreaktor anaerobik dua tahap dengan modifikasi tangki septik up-flow juga memberikan hasil estimasi biokinetika untuk parameter pertumbuhan mikroorganisme, utilisasi substrat, dan produksi metana (Acharya et al, 2011Enitan & Adeyemo, 2014Faisal & Unno, 2001;Şentürk et al, 2010;Senturk et al, 2013;Sharma & Kazmi, 2015;Singh & Valshya, 2017;Xu et al, 2013). Pada tipe packedbed anaerobic hybrid reactor (AHR) dengan penggunaan air limbah farmasi, variabel operasional suhu 30-35 °C, volume reaktor 5 L, OLR berkisar 3,2-32,3 kg-COD m -3 hari -1 dengan variasi HRT sebesar 3-30 hari, parameter biokinetika dihasilkan berupa nilai Y sebesar 0,0175 gVSS gCOD -1 L -1 , b sebesar 0,5618 hari -1 , KS sebesar lebih dari 1,83 gL -1 , dan µmax sebesar 0,046 hari -1 (Pandian et al, 2011).…”

“…Pada penelitian lain, air limbah domestik disimulasikan menggunakan bioreaktor anaerobik dua tahap, yaitu modified up-flow septic tank (sludge bed region) dan anaerobic filter (fixed bed region) dengan penambahan glukosa untuk meningkatkan konsentrasi substrat di efluen (Sharma & Kazmi, 2015). Reaktor dengan kapasitas 24 L dioperasikan pada suhu ambien, OLR berkisar 0,57-2,60 kg COD m -3 hari -1 ; serta variasi HRT pada rentang 0,5-2 hari.…”

“…Model orde kedua menghasilkan estimasi konstanta laju reduksi substrat orde kedua (k2) untuk zona tangki septik sebesar 0,36 hari -1 , zona anaerobic filter tank sebesar 0,26 hari -1 , dan sistem secara keseluruhan sebesar 0,49 hari -1 . Selain itu, Model Modifikasi Stover-Kincannon untuk fixed-bed region menghasilkan nilai KS sebesar 0,934 gL -1 dan Umax sebesar 0,737 gL -1 hari -1 (Sharma & Kazmi, 2015).…”

Four-stage biofilm anaerobic–anoxic–oxic–oxic system for strengthening the biological treatment of coking wastewater: COD removal behaviors and biokinetic modeling

“…22 Kinetic modeling is considered to be a feasible and convenient approach to deeply understand the removal performance, predict effluent concentration, and to optimize the biological process. 23,24 Various models have been reported in previous studies for evaluating the biodegradation kinetics in different kinds of treatments of various wastewaters. The Grau second-order substrate removal model involving only the inuents, effluent concentration, and the hydraulic detention time (HRT) was applied to evaluate COD removal from poultry slaughterhouse wastewater 25 and cassava starch wastewater.…”