Anaerobic treatment of a medium strength industrial wastewater at low-temperature and short hydraulic retention time: a pilot-scale experience

2011 ◽  
Vol 64 (8) ◽  
pp. 1629-1635 ◽  
Author(s):  
M. Esparza Soto ◽  
C. Solís Morelos ◽  
J. J. Hernández Torres
Keyword(s):  
Low Temperature ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Pilot Scale ◽  
Anaerobic Treatment ◽  
Uasb Reactor ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Processing Industry ◽  
Industry Wastewater

The aim of this work was to evaluate the performance of a pilot-scale upflow anaerobic sludge blanket (UASB) reactor during the treatment of cereal-processing industry wastewater under low-temperature conditions (17 °C) for more than 300 days. The applied organic loading rate (OLRappl) was gradually increased from 4 to 6 and 8 kg CODsol/m3d by increasing the influent soluble chemical oxygen demand (CODsol), while keeping the hydraulic retention time constant (5.2 h). The removal efficiency was high (82 to 92%) and slightly decreased after increasing the influent CODsol and the OLRappl. The highest removed organic loading rate (OLRrem) was reached when the UASB reactor was operated at 8 kg CODsol/m3d and it was two times higher than that obtained for an OLRappl of 4 kg CODsol/m3d. Some disturbances were observed during the experimentation. The formation of biogas pockets in the sludge bed significantly complicated the biogas production quantification, but did not affect the reactor performance. The volatile fatty acids in the effluent were low, but increased as the OLRappl increased, which caused an increment of the effluent CODsol. Anaerobic treatment at low temperature was a good option for the biological pre-treatment of cereal processing industry wastewater.

Treatment of a chocolate industry wastewater in a pilot-scale low-temperature UASB reactor operated at short hydraulic and sludge retention time

2013 ◽  
Vol 67 (6) ◽  
pp. 1353-1361 ◽  
Author(s):  
M. Esparza-Soto ◽  
O. Arzate-Archundia ◽  
C. Solís-Morelos ◽  
C. Fall
Keyword(s):  
Low Temperature ◽  
Retention Time ◽  
Biogas Production ◽  
Pilot Scale ◽  
Uasb Reactor ◽  
Organic Loading Rate ◽  
Anaerobic Sludge ◽  
Processing Industry ◽  
Sludge Retention Time ◽  
Industry Wastewater

The aim of this work was to evaluate the performance of a 244-L pilot-scale upflow anaerobic sludge blanket (UASB) reactor during the treatment of chocolate-processing industry wastewater under low-temperature conditions (18 ± 0.6 °C) for approximately 250 d. The applied organic loading rate (OLR) was varied between 4 and 7 kg/m3/d by varying the influent soluble chemical oxygen demand (CODsol), while keeping the hydraulic retention time constant (6.4 ± 0.3 h). The CODsol removal efficiency was low (59–78%). The measured biogas production increased from 240 ± 54 to 431 ± 61 L/d during the experiments. A significant linear correlation between the measured biogas production and removed OLR indicated that 81.69 L of biogas were produced per kg/m3 of CODsol removed. Low average reactor volatile suspended solids (VSS) (2,700–4,800 mg/L) and high effluent VSS (177–313 mg/L) were derived in a short sludge retention time (SRT) (4.9 d). The calculated SRT was shorter than those reported in the literature, but did not affect the reactor's performance. Average sludge yield was 0.20 kg-VSS/kg-CODsol. The low-temperature anaerobic treatment was a good option for the pre-treatment of chocolate-processing industry wastewater.

scholarly journals Efficient high strength petrochemical wastewater treatment in a hybrid vertical anaerobic biofilm (HyVAB) reactor: a pilot study

2017 ◽  
Vol 12 (3) ◽  
pp. 501-513 ◽  
Author(s):  
Shuai. Wang ◽  
Nirmal. Ghimire ◽  
Gang. Xin ◽  
Eshetu. Janka ◽  
Rune. Bakke
Keyword(s):  
Wastewater Treatment ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
High Strength ◽  
Pilot Scale ◽  
Organic Loading Rate ◽  
Anaerobic Sludge ◽  
Organic Loading ◽  
Petrochemical Wastewater ◽  
Step Flow

Performance of a pilot scale Hybrid Vertical Anaerobic Biofilm (HyVAB) reactor treating petrochemical refinery wastewater is presented here. The reactor is an integration of a bottom anaerobic sludge bed and a top aerobic biofilm stage and was operated continuously for 92 days at 21 ± 2 °C. Wastewater was fed continuously to the reactor with step flow increases reducing hydraulic retention time from 55 to 12 hours, increasing organic loading rate from 3 to 33 kg-COD/m3·d. The HyVAB removed on average 91% and 86% of the soluble and total feed COD, respectively, at steady state and loads up to 23 kg-COD/m3·d, of which 98% of the soluble COD removal occurred in the anaerobic stage. Methane yield ranged from 0.29 to 0.51 L/g-COD removed, including conversion of settled aerobic sludge to methane. Sludge production was low (0.04 kg-VSS/kg-COD removed) and biogas methane content high (84 ± 2%). The results demonstrated that HyVAB is an efficient, low footprint alternative for high strength wastewater treatment.

scholarly journals TREATMENT OF TAPIOCA WASTEWATER BY USING BIOLOGICAL HYBRID SYSTEM

2009 ◽  
Vol 12 (2) ◽  
pp. 29-38
Author(s):  
Phuoc Van Nguyen ◽  
Phuong Thi Thanh Nguyen ◽  
Thu Thi Le
Keyword(s):  
Organic Compounds ◽  
Hybrid System ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Processing Industry

Tapioca processing industry discharged into environment a significant amount of pollutants. Where, organic compounds, nutrient, and toxin CN- concentration exceeded Vietnamese discharged Standard up to hundreds of times. The study on biological hybrid system, combining aerobic biofilter and aerotank attained COD, N-NH3 treatment efficiencies in range of 98%, 95%, respectively at the optimal organic loading rate of 1 kg COD/m3.day, according to hydraulic retention time of one day. Biomass of microrganism in this system can reach to the value of 10,000 mg/L. The effluent reached to Vietnamese Standard 5945-2005, column B.

scholarly journals Effect of Hydraulic Retention Time (HRT) and Organic Loading Rate (OLR) to the Nata de coco Anaerobic Treatment Eficiency and its Wastewater Characteristics

2018 ◽  
Vol 38 (2) ◽  
pp. 160 ◽  
Author(s):  
Istna Nafi Azzahrani ◽  
Fanny Arivia Davanti ◽  
Ria Millati ◽  
Muhammad Nur Cahyanto
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Anaerobic Treatment ◽  
Organic Content ◽  
Anaerobic Digester ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Working Volume ◽  
Standard Rate

In this study, experiments were conducted to investigate the effect of hydraulic retention time (HRT) and organic loading rate (OLR) on process stability of nata de coco wastewater anaerobic treatment using semi-continuous digester. The standard-rate anaerobic digester with working volume of 8.5 L was used to investigate the effect of three different hydraulic retention times (15, 20, and 25 days), and a standard-rate anaerobic digester with working volume of 9.1 L was operated at different organic loading rates of 0.5, 1, and 1.5 g/L/day. The findings revealed that minimum HRT for nata de coco wastewater anaerobic treatment using semi-continuous digester was achieved at HRT 20 days. Based on data from this study, the reduction of organic content in nata de coco wastewater increased when OLR increased until 1 g/L/day. But then those parameters value decreased when OLR being increased further to 1.5 g/L/day. It showed that at 1.5 g/L/day the amount of substrate fed to the system was exceeding the total degradation capacity of methanogenic microorganisms, hence the organic overload happened and decreased the efficiency of organic content reduction in anaerobic treatment of nata de coco wastewater.

Start up of an anaerobic inverse turbulent bed reactor fed with wine distillery wastewater using pre-colonised bioparticles

2005 ◽  
Vol 51 (1) ◽  
pp. 153-158 ◽  
Author(s):  
C. Arnaiz ◽  
S. Elmaleh ◽  
J. Lebrato ◽  
R. Moletta
Keyword(s):  
Industrial Wastewater ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Oxygen Demand ◽  
Anaerobic Treatment ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Biofilm Reactors ◽  
Start Up ◽  
Distillery Wastewater

The long start-up period of fluidized bed biofilm reactors is a serious obstacle for their wide installation in the anaerobic treatment of industrial wastewater. This paper presents the results of an anaerobic inverse turbulent bioreactor treating distillery wastewater during 117 days of operation at a laboratory scale. The pre-colonized bioparticles for this work were obtained from a similar reactor processing the same wastewater and which had a start-up period of 3 months. The system attained carbon removal efficiency rates between 70 and 92%, at an organic loading rate of 30.6 kg m+3 d+1 (chemical oxygen demand) with a hydraulic retention time of 11.1 h. The results obtained showed that the start-up period of this kind of reactors can be reduced by 3 using pre-colonized bioparticles.

Enhanced Treatment of CSTR Anaerobic Digested Effluent from Poultry Wastewater by IC Reactor

2012 ◽  
Vol 433-440 ◽  
pp. 1239-1244
Author(s):  
Zhan Guang Liu ◽  
Xue Fei Zhou ◽  
Ya Lei Zhang ◽  
Hong Guang Zhu
Keyword(s):  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Biogas Production ◽  
Granular Sludge ◽  
Anaerobic Treatment ◽  
Controlling Factors ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Internal Circulation ◽  
Poultry Wastewater

The feasibility of applying internal circulation (IC) reactor anaerobic treatment for effluent from a CSTR plant treating poultry wastewater was examined and the key controlling factors were explored. A continuous-flow IC reactor of 12.3L capacity inoculated with anaerobic granular sludge was operated for 98 days at 35±1°C. With corresponding organic loading rate of 1.5-3.5 kgCOD/m3•d at hydraulic retention time of 1.5d, the maximum volumetric biogas production rate of 1.2 m3/m3•d and tCOD (total COD) removal efficiency in the range of 70-80% was achieved. Therefore, IC reactor is competent to treat CSTR effluent from poultry wastewater. The decrease of sCOD (soluble COD) relative to tCOD and ammonia inhibition may lead to deterioration of IC reactor anaerobic treatment.

scholarly journals Effects of Methanol on the Treatability of Black Liquor using UASB Reactor

1970 ◽  
Vol 6 ◽  
pp. 42-46
Author(s):  
Arshad Ali ◽  
Hasim Nisar Hashmi ◽  
Intikhab A. Q.
Keyword(s):  
Removal Efficiency ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Black Liquor ◽  
Uasb Reactor ◽  
Organic Loading Rate ◽  
Anaerobic Sludge ◽  
Organic Loading ◽  
Anaerobic Sludge Blanket ◽  
Gas Conversion

This study was conducted on a laboratory scale UASB (upfow anaerobic sludge blanket) reactor, treating an actual pulping effluent at an organic loading rate and hydraulic retention time of 2.1 kg-COD/m3d and 44 hours, respectively. To investigate the impacts of methanol, it was subjected to the reactor with the feeding solution (substrate) in concentration ranging from 100 mgTOC/l to 700mgTOC/l. It was observed that the overall TOC and COD removal efficiency of the reactor was improved gradually from 36% and 34% to 57% and 55%, respectively, by increasing the concentration of methanol up to 600 mgTOC/l, but very little effects of methanol on the removal efficiency of lignin were observed. The lignin removal efficiency of the reactor slightly changed from 25% to 31%. The gas conversion rate was found to be improved slightly from 0.31[L-CH4/g-CODrem.day] to 0.34 [L-CH4/g-CODrem.day], with an average methane composition of 61%. Hence, addition of methanol to the reactor can improve the black liquor degradation up to certain extent.Key words: Black liquor; Methanol; UASB; Lignin; TOCDOI: 10.3126/hn.v6i0.4193Hydro Nepal Vol. 6, January 2010Page: 42-46Uploaded Date: 24 January, 2011

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