Research for Operation Stability of TUSB Reactor and the Feasibility in Organic Wastewater Treatment

2011 ◽  
Vol 183-185 ◽  
pp. 489-494
Author(s):  
Jin Liu ◽  
Dong Wei Li ◽  
Xian Ping Gao
Keyword(s):  
Loading Rate ◽  
Impact Load ◽  
Removal Rate ◽  
Uasb Reactor ◽  
Two Phase ◽  
Reactor Technology ◽  
Operation Stability ◽  
Cod Removal Rate ◽  
Volumetric Loading ◽  
Phase Separator

According to the design concept of UASB reactor with three-phase separator, a suite of self-made TUSB reactor was produced. The operational characteristics of the reactor were tested after the reactor completed start-up, and analyzed the factors that affected the COD removal rate. The results show that, as the load changes rapidly, although there was a short decline on removal efficiency; the system still can adapt to the changes quickly, and return to its original level; the load continually increases, then the removal rate tends to be constant; the same time as the volumetric loading rate increases, the gas yield is on the rise. It is proved that the reactor technology has the resistance to flow and anti-impact load capability; meantime it also shows that the high volumetric loading rate within the two-phase separation can retain the sludge, avoiding UASB sludge wastage washout under high-load operation.

Degradation of Landfill Leachate by Ultrasound/Ultraviolet - Aged Refuse Bioreactor Combined Process

2013 ◽  
Vol 448-453 ◽  
pp. 532-535
Author(s):  
Bin Liu ◽  
Xu Ya Peng ◽  
Hua Zhao ◽  
Qi Tian
Keyword(s):  
Landfill Leachate ◽  
Biological Treatment ◽  
Impact Load ◽  
Removal Rate ◽  
Cod Removal ◽  
Combined Process ◽  
Aged Refuse ◽  
Optimum Wavelength ◽  
Cod Removal Rate ◽  
Strong Capacity

The biodegradability of aged landfill leachate is low, and the treatment effects of common processes are very poor. This paper explored the effects of the Ultrasound/Ultraviolet - Aged Refuse Bioreactor combined process on aged landfill leachate. The main results were as follows: 1The optimum power of ultrasound was 100 W, and the optimum wavelength of ultraviolet was 254 nm. The removal rate of COD was 27.33% and the value of BOD/COD ratio was increased from 0.1 to 0.35 after the treatment of Ultrasound/Ultraviolet process. Therefore, the biodegradability of the leachate was improved, which might meet the demand of subsequent biological treatment. 2The COD removal rates of the two-stage series aged refuse bioreactor were both kept above 50% during the experiment and this process had a strong capacity of resistance to impact load. 3The COD removal rate of the combined process was over 80% as a whole without any pretreatment, and it has positive significance for the treatment of aged leachate.

The Potential of Phosphorus Removal in UASB Reactor

2011 ◽  
Vol 130-134 ◽  
pp. 3515-3517
Author(s):  
Ping Lu ◽  
Tao Ding ◽  
Jin Ye Li ◽  
Jin Xia Mu
Keyword(s):  
Phosphorus Removal ◽  
Loading Rate ◽  
Removal Rate ◽  
Uasb Reactor ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Effluent Concentration ◽  
Biological Phosphorus ◽  
Main Factor

The potential of phosphorus removal rate was investigated using a lab scale UASB reactor The volumetric phosphorus removal rate was up to 20 mgP/L•d, and the phosphorus effluent concentration was below 0.5 mgP/L under high organic loading rate. Biological phosphorus assimilation could be the main pathways of phosphorus removal in UASB reactor, and the organic loading rate could be the main factor affecting phosphorus removal.

Upgrading of Anaerobic Digestion Processes for Night Soil

1986 ◽  
Vol 18 (7-8) ◽  
pp. 249-256 ◽  
Author(s):  
T. Noike ◽  
J. Matsumoto
Keyword(s):  
Anaerobic Digestion ◽  
Removal Rate ◽  
Field Investigation ◽  
Gas Production ◽  
Cod Removal ◽  
Two Phase ◽  
Anaerobic Digesters ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Cod Removal Rate

The upgrading of night soil anaerobic digestion processes was studied by field investigation of the performance of anaerobic digesters in existing night soil treatment plants and by serai-continuous experiments with bench-scale digesters. Both the average monthly amount of collected night soil fed to a digester and the concentration of volatile solids in night soil increased in winter. A good correlation was found to exist between gas production and digestion temperature. The COD removal rate in the first digester was markedly higher than that in the second digester. The stirring period in the first digester in one plant differs from that in the other plant. Stirring the first digester for too long a period reduces the rate of COD removal by the second digester in the two-stage anaerobic digestion process. The first digester should be stirred for more than one hour per day in order to promote gas production. Gas production and CODCr removal rate in the second digester were hardly affected by reductions in retention time ranging from 15 days to 5 days. As night soil contains a large amount of cellulose and other refractory organics, some kind of pretreatment of the night soil fed to the digester may be necessary for the promotion of acidogenesis in the two-phase anaerobic digestion process.

Field experience with different systems for biomass accumulation in anaerobic reactor technology

1994 ◽  
Vol 30 (12) ◽  
pp. 181-191 ◽  
Author(s):  
D. Defour ◽  
D. Derycke ◽  
J. Liessens ◽  
P. Pipyn
Keyword(s):  
Industrial Effluents ◽  
Biomass Accumulation ◽  
Anaerobic Treatment ◽  
Uasb Reactor ◽  
Anaerobic Reactor ◽  
Reactor Technology ◽  
Accumulation System ◽  
Three Phase ◽  
Phase Separator ◽  
Hybrid Reactors

Thanks to undeniable advantages as recovery of energy and a low sludge production, anaerobic wastewater treatment has received recognition in the last decade. However due to the slow methanogenic growth, inreactor biomass accumulation is essential to maintain high loading rates. Indeed wash-out of biomass is one of the main problems encountered in the anaerobic treatment of industrial effluents. A broad scoped overview of the different reactor technologies is given each with its proper biomass accumulation system. All of them are founded on two basic mechanisms for biomass accumulation: separation and retention. Settling (Anaerobic Contact reactor), ultrafiltration and flotation (FlotametP) are the techniques used to separate externally the biomass from the effluent after which the biomass can be recirculated to the anaerobic reactor. Concentration of biomass can also be achieved by attachment to a mobile (Fluidized Bed reactor) or a static carrier with possible entrapment in its macroporous structure (Anaerobic Filter reactor). The UASB-reactor incorporates retention as well as separation. By stimulating granular growth, biomass is accumulated in the lower part of the reactor. A three phase separator at the top of the reactor contributes to the final clarification of the effluent. Hybrid reactors eventually combine different biomass accumulation mechanisms: granulation, external biomass separation (Upflow Anaerobic Contact reactor) and fixation (Upflow Anaerobic Contact Filter reactor).

Flocculation, Anaerobic and Microaerobic Treatment Process of Normal Temperature Low Concentration Domestic Sewage

2012 ◽  
Vol 518-523 ◽  
pp. 2530-2534
Author(s):  
Li Jun Nie ◽  
Hua Wen Zhong ◽  
Mei Huang ◽  
Xu Dong Yin
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Removal Rate ◽  
Sewage Treatment ◽  
Anaerobic Treatment ◽  
Domestic Sewage ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Low Concentration ◽  
Cod Removal Rate

Domestic sewage was treated by adopting flocculation, anaerobic and microaerobic combined process under normal temperature. The result demonstrates: total hydraulic retention time is 5.5h (chemical flocculation 1.0h, UASB reactor 2.0h and MUSB reactor 2.5h). UASB reactor can achieve anaerobic sludge granulation under normal temperature and is fairly feasible for low concentration domestic sewage treatment. Compared with single stage UASB reactor, hydraulic retention time of flocculation-UASB combined technique reduces from 4h to 2h. COD removal rate rises from 45% to 50%-60% and suspended COD is mainly removed. DO of microaerobic MUSB technique after anaerobic treatment is 0.2mg/L-0.5mg/L with air and water ratio of 1:1. Effluent quality is stable, in accordance with first standard of Synthetical Draining Standard of Sewage, GB8978—1996.

Comparison of One-Phase and Two-Phase Anaerobic Digestion Processes in Characteristics of Substrate Degradation and Bacterial Population Levels

1991 ◽  
Vol 23 (7-9) ◽  
pp. 1157-1166 ◽  
Author(s):  
Tian Cheng Zhang ◽  
Tatsuya Noike
Keyword(s):  
Anaerobic Digestion ◽  
Bacterial Population ◽  
Removal Rate ◽  
Cod Removal ◽  
Phase System ◽  
Two Phase ◽  
Experimental Conditions ◽  
Substrate Degradation ◽  
Cod Removal Rate ◽  
The One

The comparison of one-phase and two-phase anaerobic digestion processes in the characteristics of substrate degradation and the bacterial population levels was investigated by using the chemostat-type reactors to which starch was fed as substrate when both processes were operated under the same experimental conditions. By decreasing the SRTs of both systems from 10.2 d to 5 d, 2.5 d and 1.75 d. it was found that the two-phase system was more stable to the change in pH than one-phase system. The CH4 recovery rates and COD removal rates in the two-phase system increased by 4 to 9% and 3 to 10%. respectively, although the CH4 recovery rate and the COD removal rate in the one-phase system were slightly higher than those in the two-phase system at the SRT of 10.2 d. The concentration of propionate in the effluent of the one-phase system was 30 to 50% higher than that in the two-phase system; while the concentrations of acetate and butyrate in the one-phase system were slightly lower than those in the two-phase one. The enumeration of the bacteria was performed by the MPN method. The population levels of acidogenic bacteria in both systems were in the same order (108 to 1010 MPN/ml). the population levels of hydrogenotrophs were also in the same order as the acidogenic bacteria in the two-phase system, while the population levels of hydrogenotrophs were 10 to 100 fold less than that of acidogenic bacteria in the one-phase system. The number of HAc-utilizing methanogens in the methanogenesis of the two-phase system were 2 to 10 times higher than that in the one-phase system. Therefore, the one-phase system cannot be regarded simply as the sum of acidogenesis and methanogenesis.

Study on Cultivation and Morphology of Granular Sludge in Improved Methanogenic UASB

2012 ◽  
Vol 209-211 ◽  
pp. 1152-1157 ◽  
Author(s):  
Jian Ping Huang ◽  
Li Li Liu ◽  
Yu Min Shao ◽  
Hong Jie Song ◽  
Lian Cheng Wu ◽  
...  
Keyword(s):  
Loading Rate ◽  
Ph Value ◽  
Biogas Production ◽  
Removal Rate ◽  
Granular Sludge ◽  
Maturity Stage ◽  
Two Phase ◽  
Term Operation ◽  
Start Up ◽  
Manual Regulation

Based on the mesophilic two-phase anaerobic reactor for maize ethanol wastewater treatment, the start-up, cultivation and the morphology of mature granular sludge in improved methanogenic UASB were studied. The reactor was initiated at a low loading rate. By means of increasing volume loading rate gradually and regulating internal circulation, the improved methanogenic UASB was operated under an optimal condition. After more than two months of operation, the size for the 63% of total granular sludge was more than 1.3mm, the biogas production rate and COD removal rate achieved 539L/d and 90%, respectively. Start-up of improved methanogenic UASB was accomplished successfully. Improved UASB, served as methanogenic phase of two phase anaerobic process, can adjust pH value of influent automatically. The manual regulation of pH value during start-up could be stopped when the granular sludge in improved methanogenic UASB went into maturity stage. The microfloras of mature methanogenic granular sludge are mainly brevibacterium and filamentous bacteria. Methanothrix soehngenii is the dominant consortium after the long-term operation under low-strength.

UASB-reactor in the fruit juice industry

1997 ◽  
Vol 36 (6-7) ◽  
pp. 407-414 ◽  
Author(s):  
Ute Austermann-Haun ◽  
Carl Franz Seyfried ◽  
Karl-Heinz Rosenwinkel
Keyword(s):  
Removal Efficiency ◽  
Industrial Wastewater ◽  
Fruit Juice ◽  
Loading Rate ◽  
Full Scale ◽  
Cod Removal ◽  
Uasb Reactor ◽  
Cod Removal Efficiency ◽  
Pre Treatment ◽  
Volumetric Loading

This paper presents experiences with a full scale UASB-reactor in a fruit juice factory. The focus is on demonstrating that a UASB-reactor is as suitable for campaign industries running only 2 months a year with higher concentrated wastewater as well as for the time outside the campaign when the wastewater concentrations are very low (average COD 1000 mg/l). A number of operating results and recommendations are given, resulting from the experiences in order to show solutions for handling these very different situations. Examples of recommendations are: discontinuous feeding 8 hours a day outside the campaign, removal of pellet sludge at the end of the campaign. These frame conditions provided a COD removal efficiency in the UASB-reactor consistently above 80% throughout the year. Furthermore, it is shown that the anaerobic pre-treatment of industrial wastewater is the cheapest way in regard to the running expenses. Another point of research was the co-fermentation of the kieselguhre-sludge-mixture. Although only 10% of the load was based on this substrate at a volumetric loading rate of 3 kg COD/(m3 · d), there was a quick drop in pH to a level of 3.5 and the pellet structure of the biomass got lost.

Combined UASB reactor and DAF/BF/anoxic/aerobic process for the removal of high-concentration organic matter and nutrients from slurry-type swine waste

2004 ◽  
Vol 49 (5-6) ◽  
pp. 199-205 ◽  
Author(s):  
B.U. Kim ◽  
C.H. Won ◽  
J.M. Rim
Keyword(s):  
Loading Rate ◽  
Removal Rate ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Swine Waste ◽  
High Concentration ◽  
Dissolved Air Flotation ◽  
Volumetric Loading ◽  
Anaerobic Sludge Blanket ◽  
Dissolved Air

This research aimed to effectively remove high-concentration organic matter and nutrients from slurry-type swine waste using a combined upflow anaerobic sludge blanket reactor with the dissolved air flotation/aerobic submerged biofilm/anoxic/aerobic process. The upflow anaerobic sludge blanket reactor was operated at an organics volumetric loading rate of 3.2Ð6.1 kg COD/m3/day, and the removal rates of COD were 53.9-65.5%. The removal rate of COD of the overall process was more than 99%. In the aerobic submerged biofilm, over 95% of ammonium nitrogen was removed at a volumetric loading rate of 0.08-0.16 kg NH4+-N/m3/day. The specific denitrification rate was 0.257 g NO3-N/g MLVSS/day and the removal rate of total nitrogen was 86.7%. Phosphorus was removed by flocculation in the dissolved air flotation process, and 0.16 g of PO4-P was removed by 1 g of ferric ion.

The effect of organic loading rate on the aerobic granulation: the development of shear force theory

2003 ◽  
Vol 47 (11) ◽  
pp. 235-240 ◽  
Author(s):  
J.-H. Tay ◽  
S. Pan ◽  
S.T.L. Tay ◽  
V. Ivanov ◽  
Y. Liu
Keyword(s):  
Shear Force ◽  
Loading Rate ◽  
Removal Rate ◽  
Force Balance ◽  
Organic Loading Rate ◽  
Aerobic Granules ◽  
Organic Loading ◽  
Aerobic Granulation ◽  
Close Relationship ◽  
Cod Removal Rate

The effect of organic loading rate (OLR) on aerobic granulation was studied by adopting three column-shaped, sequential aerobic sludge blanket reactors (SASBR). The reactors had been fed with laboratory prepared, synthetic dextrose-nutrient broth substrate. Experimental results showed clearly that the formation, characteristics and stability of aerobic granules had a close relationship with the strength of OLR applied. Aerobic granules appeared firstly under the OLR of 4 kg COD×(m3·day)−1. The system stabilization was demonstrated by its little-changed amount and morphology of granules. The characteristics of the stabilized granules were: 5.4 mm in mean diameter, 1.29 in roundness, 118 mg O2·(mg VSS·hr)−1 in SPOUR. The respective biomass SVI was 50 mL·(g MLVSS)−1 and the averaged COD removal rate was 95%. Under the OLR of 8 kg COD·(m3·day)−1, granules appeared two days later than those for 4 kg COD·(m3·day)-1 and they always coexisted with flocs. The formed granule bed was not as compact as that under 4 kg COD·(m3·day)−1. There were no granules formed under the OLR of 1 kg COD·(m3·day)−1. Instead, flocs with rather loose structure dominated reactor mixed-liquor. The respective SVI's were 65 and 138 mL·(g MLVSS)−1 under OLR of 8 and 1 kg COD·(m3·day)−1. It was proposed that the growth and maintenance of aerobic granules follow the shear force balance theory. Under the OLR of 4 kg COD·(m3·day)−1, a balance was reached between the aeration shear force and organic loading rate. Under this favored condition aerobic granules formed quickly and, became stabilized with the experimental parameters remained unchanged.

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