Efficiency of simulated textile wastewater decolorization process based on the methanogenic activity of upflow anaerobic sludge blanket reactor in salt inhibition condition

2004 ◽  
Vol 35 (5) ◽  
pp. 399-404 ◽  
Author(s):  
Mustafa Işik
Keyword(s):  
Textile Wastewater ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Methanogenic Activity ◽  
Anaerobic Sludge Blanket

Acid Endurance and Sorption of Zn2+ of Anaerobic Granular Sludge Acclimated by Flue Gas Pretreatment Wastewater

2013 ◽  
Vol 634-638 ◽  
pp. 182-186
Author(s):  
Juan Wang ◽  
Qin Zhong
Keyword(s):  
Flue Gas ◽  
Ph Value ◽  
Granular Sludge ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Anaerobic Granular Sludge ◽  
Methanogenic Activity ◽  
Activity Inhibition ◽  
Anaerobic Sludge Blanket

With the aim to use anaerobic granular sludge, the methanogenic activity inhibition and recovery of anaerobic granular sludge from an industrial anaerobic reactor (s1) were investigated by measuring the methane volume at low pH. A lab-scale upflow anaerobic sludge blanket (UASB) reactor was inoculated with s1.s1 was used to remove Zn2+ in wastewater. The results show that activity of s1 is similar when the pH value is 6.5 to 7.0. The methane volume is obviously decreased when the pH value is 6.0. The activity is completely inhibited when the pH value is 4.5. The activity is fully recovered when the pH is above 6.5 and hardly recovers when the pH fell to 4.5. The main Zn2+ removal mechanism is chemical adsorption.

DEGRADATION OF STARCH PARTICULATES IN A HYBRID REACTOR

1994 ◽  
Vol 30 (4) ◽  
pp. 97-104 ◽  
Author(s):  
Herbert H. P. Fang ◽  
Tin-Sang Kwong
Keyword(s):  
Loading Rate ◽  
Oxygen Demand ◽  
Upflow Anaerobic Sludge Blanket ◽  
Hybrid Reactor ◽  
Anaerobic Sludge ◽  
Methanogenic Activity ◽  
Loading Rates ◽  
Granular Biomass ◽  
Abundant Supply ◽  
Anaerobic Sludge Blanket

The study was conducted over 265 days to study the feasibility of removing starch particulates from wastewater using an 8.5 L reactor which was a hybrid between the upflow anaerobic sludge blanket (UASB) and the anaerobic filter reactors. At pH 7.2-7.5 and 37°C, the reactor was effective for the removal of chemical oxygen demand (COD) from wastewater containing starch particulates equivalent to 5000 mglL of COD with 12 hours of retention time, corresponding to a loading rate of 10 g-COD/L.d. Despite their insoluble nature, the starch particulates did not cause noticeable adverse effeels on the granulation of biomass, probably due to its easy-to-biodegrade nature and the cautious startup strategy. About 5.8% of COD in wastewater remained in the effluent, 82.5% was converted to methane, and the remaining 11.7% was converted to granular biomass with an average sludge yield of 0.09 g-VSS/g-COD. The granules exhibited a layered microstructure. The methanogenic activity of the granular biomass was 0.86 g-methane-COD/g-VSS.d in the reactor, which was considerably lower than the 1.96 g-methane-COD/ g-VSS.d measured in serum vials with an abundant supply of substrate, suggesting that further increase of loading rates was possible for the hybrid reactor.

Startup of thermophilic (55°C) UASB reactors using different mesophilic seed sludges

1996 ◽  
Vol 34 (5-6) ◽  
pp. 445-452 ◽  
Author(s):  
Herbert H. P. Fang ◽  
Ivan W. C. Lau
Keyword(s):  
Oxygen Demand ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Methanogenic Activity ◽  
The Third ◽  
Uasb Granules ◽  
Thermophilic Condition ◽  
Anaerobic Sludge Blanket ◽  
The Impact ◽  
Uasb Reactors

Performances during startup of three 2.8-litre UASB (upflow anaerobic sludge blanket) reactors operated under thermophilic condition were investigated. All reactors were seeded with mesophilic sludges: one with flocculent digester sludge (Reactor-F), another with UASB granules (Reactor-G), and the third with disintegrated granules (Reactor-D). The reactors were operated in parallel at 55°C and 24 hours of retention time, using sucrose and milk as substrate at COD (chemical oxygen demand) loadings up to 10 g-COD/l·day. Immediately after temperature was step-increased from 37°C to 55°C, all reactors encountered sludge washout and deterioration of COD removal efficiency; however, the impact of temperature increase was more severe on Reactor-F. Sludge granulation took place in all reactors; first granules became noticeable after 45 days in Reactor-D, and after 90 days in Reactor-F. Reactor-G and Reactor-D were capable of removing 95% of soluble COD after 75 days, while Reactor-F after 110 days. Throughout this study, there was little difference in performance between Reactors G and D. The thermophilic granule were estimated to have a yield of 0.099 g-VSS/g-COD, and a methanogenic activity of 0.71-1.55 g-methane-COD/g-VSS·day, comparable to that of mesophilic granules.

scholarly journals Design optimization of a simple, single family, anaerobic sewage treatment system

2017 ◽  
Vol 12 (1) ◽  
pp. 55-71
Author(s):  
Silvânia Lucas dos Santos ◽  
João Paulo de Oliveira Simões ◽  
Francisco Vieira Paiva ◽  
Adrianus van Haandel
Keyword(s):  
Large Scale ◽  
Sewage Treatment ◽  
Upflow Anaerobic Sludge Blanket ◽  
Septic Tank ◽  
Anaerobic Sludge ◽  
Single Family ◽  
Reactor Performance ◽  
Methanogenic Activity ◽  
Anaerobic Sludge Blanket ◽  
High Degree

Anaerobic sewage treatment systems, notably the upflow anaerobic sludge blanket reactor, have been applied successfully in Brazil in dozens of large scale units. In this paper a small reactor is proposed for use in single family houses, without a connection to a sewerage network. The proposed reactor is much smaller than the traditional septic tank and yet the treatment efficiency is much higher. It comprises a lower cylindrical digestion zone and an upper settling zone, connected by a transition zone. Several configurations with different digestion and settling zone diameters were tested to establish their influence on reactor performance. A high degree of organic matter removal was obtained with 250 L reactors with retention times of 6 to 12 hours. A large sludge mass was retained in the digestion zone and high treatment capacity was maintained throughout the study. Tests showed that sludge settled better in the reactor than it did after discharge with the effluent. In contrast the, methanogenic activity of the sludge in the reactor was the same as that of the sludge expelled.

Evaluation of sludge properties in a pilot-scale UASB reactor for sewage treatment in a temperate region

2011 ◽  
Vol 64 (10) ◽  
pp. 1959-1966 ◽  
Author(s):  
K. Syutsubo ◽  
W. Yoochatchaval ◽  
I. Tsushima ◽  
N. Araki ◽  
K. Kubota ◽  
...  
Keyword(s):  
Suspended Solids ◽  
Sewage Treatment ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Methanogenic Activity ◽  
Working Volume ◽  
Anaerobic Sludge Blanket

In this study, continuous operation of a pilot-scale upflow anaerobic sludge blanket (UASB) reactor for sewage treatment was conducted for 630 days to investigate the physical and microbial characteristics of the retained sludge. The UASB reactor with a working volume of 20.2 m3 was operated at ambient temperature (16–29 °C) and seeded with digested sludge. After 180 days of operation, when the sewage temperature had dropped to 20 °C or lower, the removal efficiency of both total suspended solids (TSS) and total biochemical oxygen demand (BOD) deteriorated due to washout of retained sludge. At low temperature, the cellulose concentration of the UASB sludge increased owing to the rate limitation of the hydrolytic reaction of suspended solids in the sewage. However, after an improvement in sludge retention (settleability and concentration) in the UASB reactor, the process performance stabilized and gave sufficient results (68% of TSS removal, 75% of total BOD removal) at an hydraulic retention time (HRT) of 9.7 h. The methanogenic activity of the retained sludge significantly increased after day 246 due to the accumulation of Methanosaeta and Methanobacterium following the improvement in sludge retention in the UASB reactor. Acid-forming bacteria from phylum Bacteroidetes were detected at high frequency; thus, these bacteria may have an important role in suspended solids degradation.

Acclimation of the trichloroethylene-degrading anaerobic granular sludge and the degradation characteristics in an upflow anaerobic sludge blanket reactor

2013 ◽  
Vol 69 (1) ◽  
pp. 120-127 ◽  
Author(s):  
Ying Zhang ◽  
Yang Liu ◽  
Miao Hu ◽  
Zhao Jiang
Keyword(s):  
Flow Reactor ◽  
Granular Sludge ◽  
Upflow Anaerobic Sludge Blanket ◽  
Volume Index ◽  
Synthetic Wastewater ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Methanogenic Activity ◽  
Operation Conditions ◽  
Anaerobic Sludge Blanket

The granulation process was examined in an 8 L laboratory upflow anaerobic sludge blanket (UASB) reactor using synthetic wastewater contained trichloroethylene (TCE). Glucose and lactate were used as primary substrates. The anaerobic bacteria biomass were acclimated and granulated by increasing the chemical oxygen demand (COD) and TCE loadings. Anaerobic sludge was acclimated successfully in 120 days in the anaerobic sludge acclimation appliance. Since start-up, the UASB was operated as a continuous-flow reactor under the following operation conditions: temperature of (35 ± 1)°C, pH ≈ 7.2, hydraulic retention time of 10 h, COD of 2.5 g L−1 and TCE loading rate from 50.5 to 252.3 mg · (L d)−1. The UASB reactor was started successfully. The sludge volume index was 13 mL g−1. The maximum specific methanogenic activity was 1.42 gCOD · (gVSS.d)−1. After 90 days, 85% of COD and 85% of TCE removal efficiencies were achieved. The TCE degrading granular sludge had an average diameter of 2.7 mm and total suspended solid of 52 g L−1. Anaerobic sludge adsorption of TCE reached adsorption equilibrium in 0.5 h, and in 1 h reached desorption equilibrium. Furthermore, cis-dichloroethylene and vinyl chloride were detected, which showed that the removal of TCE was caused by both adsorption and biodegradation but mainly by biodegradation.

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