Performance of a UASB reactor for low-strength wastewater treatment under different hydraulic loading rates

2018 ◽  
Vol 126 ◽  
pp. 60-66
Author(s):  
Xin Chao Ma ◽  
Tae Woo Yi ◽  
Bong Su Lim
Keyword(s):  
Wastewater Treatment ◽  
Uasb Reactor ◽  
Loading Rates ◽  
Hydraulic Loading ◽  
Low Strength

Coarse filters for pond effluent polishing: comparison of loading rates and grain sizes

2007 ◽  
Vol 55 (11) ◽  
pp. 121-126 ◽  
Author(s):  
M. von Sperling ◽  
J.G.B. de Andrada ◽  
W.R. de Melo Júnior
Keyword(s):  
Loading Rate ◽  
Uasb Reactor ◽  
E Coli ◽  
Effluent Quality ◽  
Loading Rates ◽  
Hydraulic Loading ◽  
Grain Sizes ◽  
Belo Horizonte ◽  
The City ◽  
Rock Size

A system comprising a UASB reactor, shallow polishing ponds and shallow coarse filters, treating actual wastewater from the city of Belo Horizonte, Brazil, has been evaluated. The main focus of the research was to compare grain sizes and hydraulic loading rates in the coarse filters. Two filters operating in parallel were investigated, with the following grain sizes: Filter 1: 3 to 10 cm; Filter 2: 8 to 20 cm. Two hydraulic loading rates were tested: 0.5 and 1.0 m3/m3.d. The filter with the lower rock size had a better performance than the filter with the larger rock size in the removal of SS and, as a consequence, BOD and COD. A better performance was obtained with the hydraulic loading rate of 0.5 m3/m3.d, as compared to the rate of 1.0 m3/m3.d. The effluent quality during the period with the lower loading rate was very good for discharge into water bodies or for agricultural reuse (median effluent concentrations from Filter 1: BOD: 20 mg/L; COD: 106 mg/L; SS: 28 mg/L; E. coli: 528 MPN/100 mL).

Low-strength wastewater treatment by a UASB reactor

1996 ◽  
Vol 55 (3) ◽  
pp. 187-194 ◽  
Author(s):  
Kripa Shankar Singh ◽  
Hideki Harada ◽  
T. Viraraghavan
Keyword(s):  
Wastewater Treatment ◽  
Uasb Reactor ◽  
Low Strength

Microcosm Wetlands for Wastewater Treatment with Different Hydraulic Loading Rates and Macrophytes

2002 ◽  
Vol 31 (2) ◽  
pp. 690 ◽  
Author(s):  
Shuh-Ren Jing ◽  
Ying-Feng Lin ◽  
Tze-Wen Wang ◽  
Der-Yuan Lee
Keyword(s):  
Wastewater Treatment ◽  
Loading Rates ◽  
Hydraulic Loading

Pollutants Removal Performance of Subsurface Wastewater Infiltration System under Different Hydraulic Loading Rates

2014 ◽  
Vol 675-677 ◽  
pp. 934-938
Author(s):  
Si Yu Song ◽  
Jing Pan ◽  
Yang Zhang
Keyword(s):  
Wastewater Treatment ◽  
Field Scale ◽  
Operational Parameter ◽  
Loading Rates ◽  
Hydraulic Loading ◽  
Decentralized Wastewater Treatment ◽  
Effective Depth ◽  
Removal Efficiencies ◽  
Pollutants Removal

Field-scale experiments were conducted through a subsurface wastewater infiltration system (SWIS), with effective depth of 0.8 m, under hydraulic loading rates (HLR) of 0.044, 0.071, 0.098 and 0.12 m3/(m2 d). Taking the hydraulic and treatment efficiencies into consideration, HLR of 0.098 m3/(m2 d) was recommended. Under this condition, NH3-N, COD, TN and TP average removal efficiencies were 82.6%, 83.7%, 80.6 and 91.5%, respectively. This study will guide the control of operational parameter of a SWIS when it applies in decentralized wastewater treatment.

Comparing the performance of UASB and GRABBR treating low strength wastewaters

2008 ◽  
Vol 58 (1) ◽  
pp. 225-232 ◽  
Author(s):  
A. S. Shanmugam ◽  
J. C. Akunna
Keyword(s):  
High Strength ◽  
High Rate ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Loading Rates ◽  
Low Strength ◽  
Equal Capacity ◽  
Anaerobic Sludge Blanket ◽  
The Comparative Study

Anaerobic technologies have proved successful in the treatment of various high strength wastewaters with perceptible advantages over aerobic systems. The applicability of anaerobic processes to treat low strength wastewaters has been increasing with the evolution of high-rate reactors capable of achieving high sludge retention time (SRT) when operating at low HRT. However, the performance of these systems can be affected by high variations in flow and wastewater composition. This paper reports on the comparative study carried out with two such high rate reactors systems to evaluate their performances when used for the treatment of low strength wastewaters at high hydraulic rates. One of the two systems is the most commonly used upflow anaerobic sludge blanket (UASB) reactor in which all reactions occur within a single vessel. The other is the granular bed baffled reactor (GRABBR) that encourages different stages of anaerobic digestion in separate vessels longitudinally across the reactor. The reactors, with equal capacity of 10 litres, were subjected to increasing organic loading rates (OLRs) and hydraulic retention times (HRTs) of up to 60 kg COD m−3 d−1 and 1 h respectively. Results show that the GRABBR has greater processes stability at relatively low HRTs, whilst the UASB seems to be better equipped to cope with organic overloads or shockloads. The study also shows that the GRABBR enables the harvesting of biogas with greater energetic value and hence greater re-use potential than the UASB. Biogas of up to 86% methane content is obtainable with GRABBR treating low strength wastewaters.

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