Influence of organic loading rate and solid retention time on polyhydroxybutyrate production from hybrid poplar hydrolysates using mixed microbial cultures

2015 ◽  
Vol 175 ◽  
pp. 23-33 ◽  
Author(s):  
Jing Dai ◽  
Karol Gliniewicz ◽  
Matthew L. Settles ◽  
Erik R. Coats ◽  
Armando G. McDonald
Keyword(s):  
Retention Time ◽  
Loading Rate ◽  
Hybrid Poplar ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Solid Retention Time ◽  
Microbial Cultures ◽  
Mixed Microbial Cultures

Effects of the Organic Loading Rate on Polyhydroxyalkanoate Production from Sugarcane Stillage by Mixed Microbial Cultures

2019 ◽  
Vol 189 (4) ◽  
pp. 1039-1055 ◽  
Author(s):  
Guilherme Henrique Duarte de Oliveira ◽  
Mirian Yasmine Krauspenhar Niz ◽  
Marcelo Zaiat ◽  
José Alberto Domingues Rodrigues
Keyword(s):  
Loading Rate ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Microbial Cultures ◽  
Mixed Microbial Cultures

Volatile fatty acids production from cheese whey: influence of pH, solid retention time and organic loading rate

2018 ◽  
Vol 93 (6) ◽  
pp. 1742-1747 ◽  
Author(s):  
Rolando Rafael Calero ◽  
Borja Lagoa-Costa ◽  
María Mercedes del Coro Fernandez-Feal ◽  
Christian Kennes ◽  
Maria Carmen Veiga
Keyword(s):  
Fatty Acids ◽  
Retention Time ◽  
Volatile Fatty Acids ◽  
Cheese Whey ◽  
Loading Rate ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Solid Retention Time ◽  
Influence Of Ph

Working Parameters Optimization of Hydrolysis-acidogenesis reactor in two stage anaerobic digestion of slaughterhouse Wastewater for Biogas Production

2020 ◽  
Author(s):  
Dejene Tsegaye Bedane ◽  
Mohammed Mazharuddin Khan ◽  
Seyoum Leta Asfaw
Keyword(s):  
Anaerobic Digestion ◽  
Working Conditions ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Oxygen Demand ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Slaughterhouse Wastewater ◽  
Working Parameters

Abstract Background : Wastewater from agro-industries such as slaughterhouse is typical organic wastewater with high value of biochemical oxygen demand, chemical oxygen demand, biological organic nutrients (Nitrogen and phosphate) which are insoluble, slowly biodegradable solids, pathogenic and non-pathogenic bacteria and viruses, parasite eggs. Moreover it contains high protein and putrefies fast leading to environmental pollution problem. This indicates that slaughterhouses are among the most environmental polluting agro-industries. Anaerobic digestion is a sequence of metabolic steps involving consortiums of several microbial populations to form a complex metabolic interaction network resulting in the conversation of organic matter into methane (CH 4 ), carbon dioxide (CO 2 ) and other trace compounds. Separation of the phase permits the optimization of the organic loading rate and HRT based on the requirements of the microbial consortiums of each phase. The purpose of this study was to optimize the working conditions for the hydrolytic - acidogenic stage in two step/phase anaerobic digestion of slaughterhouse wastewater. The setup of the laboratory scale reactor was established at Center for Environmental Science, College of Natural Science with a total volume of 40 liter (36 liter working volume and 4 liter gas space). The working parameters for hydrolytic - acidogenic stage were optimized for six hydraulic retention time 1-6 days and equivalent organic loading rate of 5366.43 – 894.41 mg COD/L day to evaluate the effect of the working parameters on the performance of hydrolytic – acidogenic reactor. Result : The finding revealed that hydraulic retention time of 3 day with organic loading rate of 1,788.81 mg COD/L day was a as an optimal working conditions for the parameters under study for the hydrolytic - acidogenic stage. The degree of hydrolysis and acidification were mainly influenced by lower hydraulic retention time (higher organic loading rate) and highest values recorded were 63.92 % at hydraulic retention time of 3 day and 53.26% at hydraulic retention time of 2 day respectively. Conclusion : The finding of the present study indicated that at steady state the concentration of soluble chemical oxygen demand and total volatile fatty acids increase as hydraulic retention time decreased or organic loading rate increased from 1 day hydraulic retention time to 3 day hydraulic retention time and decreases as hydraulic retention time increase from 4 to 6 day. The lowest concentration of NH 4 + -N and highest degree of acidification was also achieved at hydraulic retention time of 3 day. Therefore, it can be concluded that hydraulic retention time of 3 day/organic loading rate of 1,788.81 mg COD/L .day was selected as an optimal working condition for the high performance and stability during the two stage anaerobic digestion of slaughterhouse wastewater for the hydrolytic-acidogenic stage under mesophilic temperature range selected (37.5℃). Keywords : Slaughterhouse Wastewater, Hydrolytic – Acidogenic, Two Phase Anaerobic Digestion, Optimal Condition, Agro-processing wastewater

Impact of Hydraulic Retention Time at Constant Organic Loading Rate in a Two-Stage Expanded Granular Sludge Bed Reactor

2014 ◽  
Vol 31 (6) ◽  
pp. 317-323 ◽  
Author(s):  
Mahyar Ghorbanian ◽  
Robert M. Lupitskyy ◽  
Jagannadh V. Satyavolu ◽  
R. Eric Berson
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Granular Sludge ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Two Stage

Anaerobic treatment of leachate using sequencing batch reactor and hybrid bed filter

1997 ◽  
Vol 36 (6-7) ◽  
pp. 501-508 ◽  
Author(s):  
H. Timur ◽  
I. Özturk
Keyword(s):  
Retention Time ◽  
Organic Contaminants ◽  
Loading Rate ◽  
Batch Reactor ◽  
Anaerobic Treatment ◽  
Organic Loading Rate ◽  
Batch Reactors ◽  
Solid Retention Time ◽  
Toc Removal ◽  
Specific Loading

Landfill leachate taken from a young municipal landfill site (≈3.5 years old) containing high organic contaminants (Total Organic Carbon -TOC of about 5000 mg l−1) was treated in bench-scale Anaerobic Sequencing Batch Reactors (ASBR) and an Anaerobic Hybrid Bed Filter (AHBF) at mesophilic conditions. Twenty months of testing has been conducted at varied influent leachate concentration of 546–5770 mgTOC l−1, Hydraulic Retention Time (HRT) of 10–1.5 days and Solid Retention Time (SRT) of 40–9 days in ASBR's, and influent leachate concentration of 1250–4490 mgTOC l−1 and HRT of 5.1–0.9 days in AHBF. ASBR achieved 73.9% TOC removal at maximum organic loading rate of 2.8 kgTOC m−3 d−1 at 1.5 days of HRT, and 65.3% at 0.561 kgTOC kgVSS−1 d−1 of maximum specific loading rate and 2 days of HRT. The AHBF maintained 81.4% TOC removal at 1.2 kgTOC m−3 d−1 of loading and 2.4 days of HRT. Methane conversion ratio averaged 0.742 m3CH4 kgTOC−1 removed at (STP).

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