scholarly journals MODEL ESTIMASI BIOKINETIKA UNTUK PROSES POST-DENITRIFIKASI AIR LIMBAH DOMESTIK PADA UNIT ANAEROBIC BAFFLED REACTOR

2021 ◽  
Vol 17 (2) ◽  
pp. 69-82
Author(s):  
Allen Kurniawan ◽  
Fatihaturrizky Amelia ◽  
Adhirajasa Wirayudhatama ◽  
Sulpa Yudha Prawira
Keyword(s):  
Substrate Concentration ◽  
Volatile Fatty Acids ◽  
High Strength ◽  
Hydrolysis Rate ◽  
Yield Coefficient ◽  
Continuous Stirred Tank Reactor ◽  
Acid Fermentation ◽  
Anaerobic Baffled Reactor ◽  
Wastewater Quality ◽  
Denitrification Process

This study developed a combination of Continuous Stirred Tank Reactor (CSTR) for the acid fermentation and the Anaerobic Baffled Reactor (ABR) post-denitrification through high nitrite injection. Volatile Fatty Acids (VFAs) as a substrate for the post-denitrification process were optimally produced in the acid fermentation process. The aim of this study was to obtain the estimation of biokinetic values to predict the effluent wastewater quality in ABR post-denitrification process under unsteady state. The reactor was operated for HRT 7 days at temperature 25-28 ˚C and pH 6-7,2. The influent and effluent substrate concentration were monitored continuously for 160 days. Post-denitrification biokinetic from the Contois equation resulted in the value of hydrolysis rate (Kh) of 0.077 day-1, the substrate transport rate (k) of 4.364×10-6 Lmg-1day-1, maximum specific growth rate (μmax) of 0.559 day-1, half saturation constant (KS) of 0.209 mgL-1, microbial decay coefficient (b) of 0.0145 days-1; yield coefficient (Y) of 0.084 g-VSSg-COD-1. The validation of biokinetic parameters based on statistical analysis showed fairly precise results following the trend of experimental data to determine the substrate concentration in the effluent unit. Therefore, the biokinetic values can be applied in the design of ABR post-denitrification using primary sludge incorporation with high strength nitrate.Keywords:  Anaerobic baffled reactor, biokinetics, Contois, hydrolysis, post-denitrification.

Estimation of biokinetic parameters in the acid fermentation of primary sludge using an anaerobic baffled reactor

2018 ◽  
Vol 4 (12) ◽  
pp. 1997-2011
Author(s):  
Allen Kurniawan ◽  
Yanuar Chandra Wirasembada ◽  
Ki Young Park ◽  
Young Mo Kim ◽  
Jin Hur ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Growth Rate ◽  
Microbial Growth ◽  
Volatile Fatty Acids ◽  
Hydraulic Retention Time ◽  
Acid Fermentation ◽  
Primary Sludge ◽  
Anaerobic Baffled Reactor ◽  
High Concentrations ◽  
Biokinetic Parameters

Biokinetic models of anaerobic baffled reactor (ABR) type-acid fermentation with a short hydraulic retention time (HRT) of four days were proposed for obtaining high concentrations of volatile fatty acids (VFAs) based on the dynamic microbial growth rate.

Study on Performance of a Modified Anaerobic Baffled Reactor to Treat High Strength Wastewater

2011 ◽  
Vol 11 (8) ◽  
pp. 1449-1452 ◽  
Author(s):  
A. Malakahmad ◽  
A.B. Noor Ezlin ◽  
Md.Z. Shahrom
Keyword(s):  
High Strength ◽  
Anaerobic Baffled Reactor

scholarly journals Impact of Alkaline Pretreatment to Enhance Volatile Fatty Acids (VFAs) Production from Rice Husk

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Qian Fang ◽  
Sinmin Ji ◽  
Dingwu Huang ◽  
Zhouyue Huang ◽  
Zilong Huang ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Acetic Acid ◽  
Propionic Acid ◽  
Butyric Acid ◽  
Rice Husk ◽  
Volatile Fatty Acids ◽  
Alkaline Pretreatment ◽  
Rice Husks ◽  
Acid Fermentation ◽  
Study Results

This study explores the use of alkaline pretreatments to improve the hydrolyzation of rice husks to produce volatile fatty acids (VFAs). The study investigated the effects of reagent concentration and pretreatment time on protein, carbohydrates, and dissolved chemical oxygen demand (SCOD) dissolution after the pretreatment. The optimum alkaline pretreatment conditions were 0.30 g NaOH (g VS)−1, with a reaction time of 48 h. The experimental results show that when comparing the total VFA (TVFA) yields from the alkaline-pretreated risk husk with those from the untreated rice husk, over 14 d and 2 d, the maximum value reached 1237.7 and 716.0 mg·L−1 with acetic acid and propionic acid and with acetic acid and butyric acid, respectively. After the alkaline pretreatment, TVFAs increased by 72.9%; VFA accumulation grew over time. The study found that alkaline pretreatment can improve VFA yields from rice husks and transform butyric acid fermentation into propionic acid fermentation. The study results can provide guidelines to support the comprehensive utilization of rice husk and waste treatment.

scholarly journals Plantwide modelling – anaerobic digestion of waste sludge from parent nutrient (N and P) removal systems

Water SA ◽  
2019 ◽  
Vol 45 (3 July) ◽  
Author(s):  
DS Ikumi ◽  
GA Ekama
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Volatile Fatty Acids ◽  
Treatment Plant ◽  
Anaerobic Digester ◽  
Hydrolysis Rate ◽  
Biological Nutrient Removal ◽  
Biomass Hydrolysis ◽  
Behavioural Patterns ◽  
Anaerobic Zone

Wastewater treatment plant (WWTP) mathematical models are based on the behavioural patterns of microorganisms involved in the treatment process. These microorganisms are assumed incapable of thinking or planning but simply act according to the capabilities afforded to them by their surrounding conditions – hence different microorganisms pre-dominate different WWTP zones according to how well the conditions suit them. When waste activated sludge (WAS) from biological nutrient removal (BNR) activated sludge (AS) systems, containing phosphorus-accumulating organisms (PAOs), is fed to an anaerobic digester, there is a release of high quantities of metals, phosphorus (P) and nitrogen (N). The manner in which we model the release of these metals and nutrients significantly affects the accuracy of predicted anaerobic digestion (AD) outcomes. Previous studies of PAOs show that in the anaerobic zone of the AS system, they can form energy-rich poly3-hydroxybutyrate (PHB) at the expense of their aerobically generated polyphosphate (PP). Thus, it is expected that the PAOs containing PP sent into an anaerobic digester with volatile fatty acids (VFAs) present, would utilize their PP reserves as they would in the anaerobic zone of an AS process ending up with formation and storage of some PHB. Ultimately, all the stored products of the PAO get released, since there is no alternating aerobic environment to cater for their growth. Since it has been established that the PP release in the AD occurs much faster than the PAO biomass hydrolysis rate, it is modelled as a separate process. Steps are presented in the development of this PP release mass-balanced stoichiometries that occur with AD of PAOs. By comparing outcomes from these proposed stoichiometries against measured experimental data, it is noticed that better predictions are obtained with acetate uptake for PHB formation than when modelling the AD PP release to occur with PAO death and hydrolysis.

scholarly journals Volatile Fatty Acids Production from Codigestion of Food Waste and Sewage Sludge Based on β-Cyclodextrins and Alkaline Treatments

Archaea ◽  
2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Xue Yang ◽  
Xiang Liu ◽  
Si Chen ◽  
Guangmin Liu ◽  
Shuyan Wu ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Sewage Sludge ◽  
Food Waste ◽  
Bacterial Communities ◽  
Volatile Fatty Acids ◽  
Integrated Treatment ◽  
Hydrolysis Rate ◽  
Novel Technology ◽  
Initial Ph ◽  
Hydrolysis Of

Volatile fatty acids (VFAs) are preferred valuable resources, which can be produced from anaerobic digestion process. This study presents a novel technology using β-cyclodextrins (β-CD) pretreatment integrated alkaline method to enhance VFAs production from codigestion of food waste and sewage sludge. Experiment results showed that optimized ratio of food waste to sewage sludge was 3 : 2 because it provided adequate organic substance and seed microorganisms. Based on this optimized ratio, the integrated treatment of alkaline pH 10 and β-CD addition (0.2 g/g TS) performed the best enhancement on VFAs production, and the maximum VFAs production was 8631.7 mg/L which was 6.13, 1.38, and 1.57 times higher than that of control, initial pH 10, and 0.2 g β-CD/g TS treatment, respectively. Furthermore, the hydrolysis rate of protein and polysaccharides was greatly improved in integration treatment, which was 1.18–3.45 times higher than that of other tests. Though the VFAs production and hydrolysis of polymeric organics were highly enhanced, the primary bacterial communities with different treatments did not show substantial differences.

Treatment of slaughterhouse wastewater in upflow anaerobic sludge blanket reactor

2011 ◽  
Vol 63 (5) ◽  
pp. 877-884 ◽  
Author(s):  
P. Mijalova Nacheva ◽  
M. Reyes Pantoja ◽  
E. A. Lomelí Serrano
Keyword(s):  
Volatile Fatty Acids ◽  
Removal Rate ◽  
Additional Treatment ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Organic Load ◽  
Anaerobic Sludge ◽  
Yield Coefficient ◽  
Slaughterhouse Wastewater ◽  
Anaerobic Sludge Blanket

The performance of an upflow anaerobic sludge blanket (UASB) reactor operated at ambient temperature (20.9–25.2°C) was analysed for the treatment of slaughterhouse wastewater previously pre-treated for solid separation. The experimental work was carried out in a reactor with 15 L effective volume. Four organic loads were applied and the process performance was evaluated. The COD removal rate increased with the load rise from 4 to 15 kg COD.m−3.d−1. Removal efficiencies of 90% were obtained with a load of 15 kg COD.m−3.d−1. The entrapment of suspended solids in the sludge blanket was greater in proportion during the first two stages due to the low upflow velocities used when loads of 4 and 7 kg COD.m−3.d−1 were evaluated. This phenomenon did not affect the structure of the biological grains or their methanogenic activity. More than 50% of the organic nitrogen was degraded, causing a 3% increase of ammonia concentration. The concentrations of the volatile fatty acids were not high and the wastewater alkalinity was enough to prevent acidification. The yield coefficient of methane production increased with the load rise, reaching 0.266 m3/kg CODremoved at 15 kg COD.m−3.d−1 organic load. The UASB reactor is a good option for the biological treatment of pre-treated slaughterhouse wastewater. However, additional treatment is required in order to accomplish the water quality requirements in discharges to water bodies.

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