Anaerobic Treatment of Sewage Sludge Treated by Catalytic Wet Oxidation Process in Upflow Anaerobic Sludge Blanket Reactors

1992 ◽  
Vol 26 (3-4) ◽  
pp. 867-875 ◽  
Author(s):  
J. J. Song ◽  
N. Takeda ◽  
M. Hiraoka
Keyword(s):  
Sewage Sludge ◽  
Oxidation Process ◽  
Anaerobic Treatment ◽  
Single Step ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Wet Oxidation ◽  
Catalytic Wet Oxidation ◽  
Volumetric Loading ◽  
Anaerobic Sludge Blanket

To increase the efficiency of methane recovery in anaerobic treatment, sewage sludge was treated by catalytic wet oxidation process(CWOP).The CWOP is designed to treat sewage sludge with the aid of a newly developed catalyst. It is a treatment process, by which concentrated COD components and suspended solids in various kinds of sludge can be simultaneously oxidized and treated with great efficiency in a single step without dilution. After CWOP, this supernatant was treated by upflow anaerobic sludge blanket(UASB) for recovery of methane. This experiment was to evaluate the acclimation of UASB process to the supernatant of sewage sludge treated by CWOP. For the granule growth and accumulation, supernatant was introduced stepwise (25%, 33%, 50%, 100%). The supernatant was 7,200 mg-COD/L which contained 53% carbonic acids. The reactor was operated at a volumetric loading rate from 1.8 (kg·COD/m3·day) to 14.4 (kg·COD/m3·day) and overall HRT of less than 24 hrs throughout the experiment. In the conventional anaerobic biochemical process of methane gas recovery was limited to 50% of COD recovery. As a result of this study, the COD recovery to about 93% was obtained by the coebination of CWOP and UASB process. The following conditions were enough for pretreatment: temperature, 270°C; pressure, 86kg/m2; stoichiometric air ratio, 1.1; reaction time, 24 min. These results indicate that the CWOP-UASB process may be attractive as an alternative sewage sludge treatment.

Anaerobic treatment of proteinaceous wastewater under mesophilic and thermophilic conditions

1999 ◽  
Vol 40 (1) ◽  
pp. 77-84 ◽  
Author(s):  
H. H. P. Fang ◽  
D. Wai-Chung Chung
Keyword(s):  
Bacterial Species ◽  
Oxygen Demand ◽  
Anaerobic Treatment ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Loading Rates ◽  
Batch Tests ◽  
Thermophilic Conditions ◽  
Anaerobic Sludge Blanket ◽  
Hydrolysis Of

Experiments were conducted in two 2.8 liter UASB (upflow anaerobic sludge blanket) reactors treating proteinaceous wastewaters at 37° and 55°C with 9 hours of hydraulic retention. Results showed that the mesophilic reactor consistently removed 83.5-85.1% of COD (chemical oxygen demand) at loading rates ranging 8-22 g COD l−1 d−1 (corresponding to 3000-8250 mg l−1 of proteinaceous COD in wastewater), whereas the thermophilic reactor removed only 68.5-82.7%. At 32 g COD l−1 d−1 (i.e. 12000 mg COD l−1), the removal efficiencies were lowered to 75.7% in the mesophilic reactor and 65.1% in the thermophilic reactor. At 42 g COD l−1 d−1, severe sludge washout occurred in the mesophilic reactor; at the same loading rate, the thermophilic reactor removed only 53.8% of COD even though sludge washout was under control. The degradation rate in the both reactors was limited by the initial hydrolysis of proteins. However, batch tests showed that thermophilic sludge had slightly higher methanogenic activities than mesophilic sludge in treating proteins and intermediate acids, except propionate. The sludge yields in mesophilic and thermophilic reactors were 0.066 and 0.099 g VSS g COD−1, respectively. Observations by scanning electron microscopy indicated that both types of sludge granules were of irregular shape. There was little noticeable difference between the two granules; both had neither a layered microstructure nor a predominant bacterial species.

The Anaerobic Treatment of Sewage and Granule Formation in Upflow Anaerobic Sludge Blanket Reactor

2006 ◽  
Vol 27 (9) ◽  
pp. 1031-1036 ◽  
Author(s):  
H. Makni ◽  
F. Bettaieb ◽  
H. Dhaouadi ◽  
F. M'Henni ◽  
A. Bakhrouf
Keyword(s):  
Anaerobic Treatment ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Granule Formation ◽  
Anaerobic Sludge Blanket

Anaerobic treatment of concentrated latex processing wastewater in two-stage upflow anaerobic sludge blanketA paper submitted to the Journal of Environmental Engineering and Science.

2010 ◽  
Vol 37 (5) ◽  
pp. 805-813 ◽  
Author(s):  
Siriuma Jawjit ◽  
Winai Liengcharernsit
Keyword(s):  
Industrial Effluent ◽  
Oxygen Demand ◽  
Anaerobic Treatment ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Optimal Conditions ◽  
Two Stage ◽  
Oxidation Pond ◽  
Treatment Performance ◽  
Anaerobic Sludge Blanket

This study aims to investigate treatment performance of the two-stage upflow anaerobic sludge blanket (UASB) applied to concentrated latex processing wastewater in Thailand. First, optimal conditions including the hydraulic retention time (HRT) in the acid tank and the UASB tank, pH, and temperature (mesophilic and thermophilic) were determined. It was found that the HRT at 24 h and 48 h were the optimal HRT for the acid tank and the UASB tank, respectively. The pH of the system should be controlled at 7 to prevent rubber coagulation and to achieve high treatment performance, and the mesophilic condition (35°C) was found to be the optimal temperature. Second, the two-stage UASB was applied with the optimal conditions mentioned earlier with real wastewater at a latex mill. It was found that methane production was about 0.116 L CH4/g COD removed (16.3–22.8 m3CH4/d), and average chemical oxygen demand (COD) and suspended solids (SS) removal efficiency were about 82% and 92%, respectively. In case of SS removal, the results revealed that the two-stage UASB was capable of overcoming the limitations of the single-stage UASB in treating concentrated latex effluent. The results indicated that application of the two-stage UASB to concentrated latex processing wastewater is feasible. Nevertheless, combination with other treatment systems (e.g., oxidation pond, aerated lagoon) is necessary to meet Thailand's industrial effluent standards (in the case of COD).

Design Operation and Economy of Anaerobic Treatment

1983 ◽  
Vol 15 (8-9) ◽  
pp. 177-195 ◽  
Author(s):  
G Lettinga ◽  
S W Hobma ◽  
L W Hulshoff Pol ◽  
W de Zeeuw ◽  
P de Jong ◽  
...  
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Waste Water Treatment ◽  
Anaerobic Treatment ◽  
High Rate ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Water Treatment Process ◽  
Filter Process ◽  
Anaerobic Sludge Blanket

This paper aims to contribute to the assesment of a (more) optimal design and operation of a high rate anaerobic waste water treatment process. The discussion will be made on basis of available information of modern anaerobic waste water treatment processes, such as the Anaerobic Filter Process and the Upflow Anaerobic Sludge Blanket process and of recently introduced Attached Film processes.

Start-Up Strategy to Achieve Excellent Efficiency of Degradation Acetate,Ethanol and Propionate in UASB

2011 ◽  
Vol 71-78 ◽  
pp. 2103-2106
Author(s):  
Ming Yue Zheng ◽  
Ming Xia Zheng ◽  
Kai Jun Wang ◽  
Hai Yan
Keyword(s):  
Loading Rate ◽  
Anaerobic Treatment ◽  
Upflow Anaerobic Sludge Blanket ◽  
Organic Loading Rate ◽  
Anaerobic Sludge ◽  
Organic Loading ◽  
Metabolic Intermediate ◽  
Loading Rates ◽  
Start Up ◽  
Anaerobic Sludge Blanket

The performance of upflow anaerobic sludge blanket (UASB) fed with three metabolic intermediate (acetate, ethanol, and propionate) respectively was studied. The degradation of metabolic intermediate were investigated to discuss the reason for propionate inhibition problem in anaerobic treatment. The hydraulic retention time (HRT) in the reactors started with 8.0h.The yield rate of biogas were 237ml/gCOD, 242ml/gCOD, 218ml/gCOD for acetate, ethanol and propionate, respectively when finishing start-up under OLR of 5.0 kgCOD/(m3·d) (HRT=9.6h).The HRT remained constant 9.6h,and the substrate concentration was gradually increased from 1,000 to 16,000mg/L as COD,and the organic loading rates(OLR) was from 3.0 to 40.0 kgCOD/(m3·d).The maximum propionate concentration was 41.6 gHPr-COD/L at the organic loading rate of 43.9 kgCOD/(m3·d) (HRT, 9.6h) as well as acetate and ethanol.

Anaerobic treatment of Wastewater from a fish-canning factory in a full-scale Upflow Anaerobic Sludge Blanket (UASB) reactor

1999 ◽  
Vol 40 (8) ◽  
pp. 57-62 ◽  
Author(s):  
A. Pun˜al ◽  
J. M. Lema
Keyword(s):  
Anaerobic Treatment ◽  
Upflow Anaerobic Sludge Blanket ◽  
Total Alkalinity ◽  
Uasb Reactor ◽  
Organic Loading Rate ◽  
Anaerobic Sludge ◽  
Stable Operation ◽  
Start Up ◽  
Upward Velocity ◽  
Anaerobic Sludge Blanket

The start-up and optimisation of a 380 m3 UASB reactor (Up-flow Anaerobic Sludge Blanket) treating wastewater from a fish-canning factory was carried out. At the beginning of the operation the Organic Loading Rate (OLR) was 1 kg COD/m3·d. Then, the load was gradually increased in steps of 50% OLR until the final capacity of the system (4 kg COD/m3·d) was achieved. Wastewater characteristics were highly dependent on the canned product (mussel, tuna, sardines, etc.). In spite of that, a stable operation working at a hydraulic retention time (HRT) of 2 days was maintained. Total Alkalinity (TA) always presented values higher than 3 g CaCO3/l, while the IA/TA ratio (Intermediate Alalinity/Total Alkalinity) was always maintained lower than 0.3. In order to improve granulation conditions, upward velocities from 0.5 to 0.8 m/h were applied. The highest values caused the washout of non-granulated biomass from the reactor, optimum operation being achieved at an upward velocity of 0.7 m/h.

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