scholarly journals Field-scale anaerobic baffled reactor for domestic wastewater treatment: effect of dynamic operating conditions

2020 ◽  
Author(s):  
S. S. Yenji ◽  
G. R. Munavalli ◽  
M. M. Koli
Keyword(s):  
Loading Rate ◽  
Organic Content ◽  
Operating Conditions ◽  
Aluminium Chloride ◽  
Organic Loading Rate ◽  
Phase System ◽  
Field Scale ◽  
Two Phase ◽  
Anaerobic Baffled Reactor ◽  
Sludge Granulation

Abstract A 45 m3/d field-scale anaerobic baffled reactor (ABR) was studied for its performance to remove carbonaceous organic content and suspended solids under a dynamic hydraulic loading rate (HLR) and organic loading rate (OLR). Sludge granulation effect was also assessed with and without sand as a bio-carrier aided with poly aluminium chloride. ABR was subjected to a significant variation in HLR (0.26 to 7.72 m3/m2.d) and OLR (0.03 to 8 kg COD/m3.d). Tracer study showed flow-through time was 50% of theoretical hydraulic retention time. The initial compartments of ABR were more effective for the removal of organic carbon. An overall CODTotal removal of 60 to 90% was possible for OLR in the range 1 to 8 kg COD/m3.d irrespective of low/high HLR. OLR dominated the performance of ABR compared to HLR. The compartmentalized nature of ABR was visualized through a two-phase system of anaerobic digestion as alkalinity increased while VFA decreased from the first to last compartment even under dynamic conditions. Sludge granulation with sand and PAC increased the size of granule from 629 to 1,471 μm, decreased sludge depth by 20% and enhanced CODTotal removal within a month. ABR is sturdy to sustain low/high HLR with low/high OLR conditions without impairing CODTotal removal efficiency significantly.

Performance of an anaerobic baffled reactor (ABR) as a hydrolysis-acidogenesis unit in treating landfill leachate mixed with municipal sewage

2000 ◽  
Vol 42 (12) ◽  
pp. 115-121 ◽  
Author(s):  
B. Wang ◽  
Y. Shen
Keyword(s):  
Landfill Leachate ◽  
Loading Rate ◽  
Granular Sludge ◽  
Operational Performance ◽  
Municipal Sewage ◽  
Organic Loading Rate ◽  
Stable Operation ◽  
Organic Loading ◽  
Anaerobic Baffled Reactor ◽  
Biological Treatability

A study on the performance of an Anaerobic Baffled Reactor(ABR) as a hydrolysis-acidogenesis unit in treating the mixed wastewater of landfill leachate and municipal sewage in different volumetric ratios was carried out. The results showed that ABR substantially improved the biological treatability of the mixed wastewater by increasing its BOD5/COD ratio to 0.4–0.6 from the initial values of 0.15–0.3. The formation of bar-shaped granular sludge of 0.5–5 mm both in diameter and length with an SVI of 7.5–14.2 ml/g was observed in all compartments of the ABR when the organic loading rate reached 4.71 kgCOD/m3 · d. The effects of the ratios of NH4+-N/COD and COD/TP in mixed wastewater on the operational performance were also studied, from which it was found that a reasonable NH4+-N/COD ratio should be lower than 0.02, and the phosphorus supplement was needed when the volumetric ratio was higher than 4:6 for stable operation of ABR.

Organic loading rate (OLR) regulation for enhancement of aerobic sludge granulation: Role of key microorganism and their function

2019 ◽  
Vol 653 ◽  
pp. 630-637 ◽  
Author(s):  
Zhiming Zhang ◽  
Jianxiang Qiu ◽  
Ronghao Xiang ◽  
Haitian Yu ◽  
Xiangyang Xu ◽  
...  
Keyword(s):  
Loading Rate ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Sludge Granulation ◽  
Aerobic Sludge

Pig Wastewater Treatment in Water Hyacinth Ponds

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2381-2384 ◽  
Author(s):  
C. Polprasert ◽  
S. Kessomboon ◽  
W. Kanjanaprapin
Keyword(s):  
Wastewater Treatment ◽  
Water Hyacinth ◽  
Loading Rate ◽  
Pilot Scale ◽  
Operating Conditions ◽  
Cod Removal ◽  
Organic Loading Rate ◽  
Small Scale ◽  
N Removal ◽  
In Series

Small-scale and pilot-scale experiments were conducted on pig wastewater treatment in water hyacinth (Eichhornia crassipesl ponds. The main objectives were to evaluate the treatment performance of the water hyacinth ponds and to determine suitable operating conditions. From the experimental results obtained, the optimum organic loading rate was found to be 200 kg COD/(ha.d), while the hydraulic retention times were proposed to be 10-20 days. The % COD removal in the small-scale water hyacinth ponds were 74-93, while for the pilot-scale ponds the % COD removal were 52-72 because of fluctuations in the influent wastewater characteristics and occasional insect attacks on the water hyacinth leaves and stems. Similar results were obtained for N removal. Although the water hyacinth ponds were found to be feasible for pig wastewater treatment, at least one polishing pond in series should be provided to polish the water hyacinth pond effluents before discharging into the environment.

Effect of organic loading rate (OLR) on the performance of modified anaerobic baffled reactor (MABR) supported by slanted baffles

2017 ◽  
Vol 79 ◽  
pp. 56-63 ◽  
Author(s):  
Maizatul Asnie Mohd Aris ◽  
Shreeshivadasan Chelliapan ◽  
Mohd Fadhil Md Din ◽  
Aznah Nor Anuar ◽  
Rafidah Shahperi ◽  
...  
Keyword(s):  
Loading Rate ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Anaerobic Baffled Reactor

scholarly journals Effects of Organic Loading Rate on the Performance of a Pressurized Anaerobic Filter in Two-Phase Anaerobic Digestion

Energies ◽  
2014 ◽  
Vol 7 (2) ◽  
pp. 736-750 ◽  
Author(s):  
Yuling Chen ◽  
Benjamin Rößler ◽  
Simon Zielonka ◽  
Anna-Maria Wonneberger ◽  
Andreas Lemmer
Keyword(s):  
Anaerobic Digestion ◽  
Loading Rate ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Two Phase ◽  
Anaerobic Filter

scholarly journals Influence of Organic Loading Rate on the Performance of a Two-Phase Pressurized Biofilm (TPPB ) System Treating Food Waste

2017 ◽  
Vol 26 (5) ◽  
pp. 2047-2052
Author(s):  
Yeqing Li ◽  
Fang Yan ◽  
Hong Liu ◽  
Yafei Wang ◽  
Hong Nie ◽  
...  
Keyword(s):  
Food Waste ◽  
Loading Rate ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Two Phase

Effect of the organic loading rate on the performance of anaerobic acidogenic fermentation of two-phase olive mill solid residue

2008 ◽  
Vol 28 (5) ◽  
pp. 870-877 ◽  
Author(s):  
B. Rincón ◽  
E. Sánchez ◽  
F. Raposo ◽  
R. Borja ◽  
L. Travieso ◽  
...  
Keyword(s):  
Loading Rate ◽  
Organic Loading Rate ◽  
Solid Residue ◽  
Organic Loading ◽  
Two Phase ◽  
Acidogenic Fermentation ◽  
Olive Mill

scholarly journals Two-phase thermophilic anaerobic digestion process for biohythane production treating biowaste: preliminary results

2011 ◽  
Vol 64 (3) ◽  
pp. 715-721 ◽  
Author(s):  
C. Cavinato ◽  
D. Bolzonella ◽  
F. Fatone ◽  
A. Giuliano ◽  
P. Pavan
Keyword(s):  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Biogas Production ◽  
Pilot Scale ◽  
Organic Loading Rate ◽  
Gas Composition ◽  
Two Phase ◽  
Thermophilic Anaerobic Digestion ◽  
Working Volume ◽  
And Control

This paper deals with the optimization of a two-phase anaerobic process treating biowaste for hydrogen and methane production. Neither physical nor chemical pre-treatments were used to optimize the process. The work was carried out at pilot scale, using two CSTRs (200 and 380 L working volume respectively) both maintained at thermophilic temperature (55 °C) and fed semi-continuously with biowaste. The experiment was divided into three periods; during the first two periods the organic loading rate was maintained at 20 kg TVS/m3 d and the hydraulic retention time was changed from 6.6 to 3.3 days, while in the last period the digestate of the second reactor was recirculated to the first reactor in order to buffer the system and control pH at levels around 5. The HRT was maintained at 3.3 days and the OLR was decreased at 16.5 kg TVS/m3 d. The best yield was obtained in the last period where a specific hydrogen production of 50.9 L/kg VSfed was reached, with a H2 content in biogas from the first reactor of 36%. The methanogenic stage after the hydrogen conversion reached a specific biogas production of 0.62 m3/kg VSfed and an overall organic removal above 70%, without any stability problem. The overall biogas production was some 1.5 m3 per day with a gas composition of 10% H2 and 50% CH4.

Innovative Integrated Reactor System for Carbon, Sulfur and Nitrogen Removal Based on Biological Phase-Separation

2012 ◽  
Vol 518-523 ◽  
pp. 2547-2552
Author(s):  
Chun Shuang Liu ◽  
Ai Jie Wang ◽  
Chao Cheng Zhao
Keyword(s):  
Organic Matter ◽  
Phase Separation ◽  
Loading Rate ◽  
Maximum Level ◽  
Operating Conditions ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Operational Parameters ◽  
Organic Matter Removal ◽  
Metabolic Functions

An innovative biological wastewater treatment system for the removal of organic carbon, sulfur and nitrogen was developed based on biological phase-separation principle. This system consists of three reactors integrated together i.e. sulfate reduction and organic matter removal (SR-CR), autotrophic and heterotrophic denitrifying sulfide removal (A&H-DSR) and nitrification (AN) reactors. In this system, the operational parameters for successful bio-phase separation are sulfate and organic loading rate, hydraulic retention time (HRT), COD/SO42-ratio and pH for the SR-CR reactor, and sulfide and nitrate loading rate, HRT, pH, S2-/NO3-ratio and COD/NO3-for the A&H-DSR reactor. The results from a laboratory scale system demonstrated that for the SR-CR reactor, the optimal operating conditions were HRT≥24 h; sulfate and organic loading rate ≤7.5 kg SO42-/m3•d and ≤10 kgCOD/m3•d; COD/SO42-≥2; and pH ≥6.5. For A&H-DSR process, the optimal conditions are sulfide loading rate ≤6.0kg S2-/m3•d; nitrate loading rate ≤3.5 kg NO3-/m3•d; S2-/NO3-≥1; COD/NO3-≥1.25:1; and pH≥7.5. Under such conditions, high sulfate, ammonia and organic matter removal of 99%, 90% and 99% were achieved, respectively. In this case, the elemental sulfur (S0) reclamation efficiency reached 6.0 kg S0/m3•d, around 20 times higher than the maximum level as referred in the literatures. DGGE profiling indicated that the predominant functional organisms of Clostridiaceae sp., Desulfomicrobium sp., Methanosaeta sp. dominated in the SR-CR reactor, and Sulfurovum sp., Pseudomonas aeruginosa and Denitratisoma sp. in the A&H-DSR reactor. These species played essential role in metabolic functions in each bio-phase.

scholarly journals Enhanced biomethane production by co-digestion of mixed sewage sludge and dephenolised two-phase olive pomace

2021 ◽  
pp. 0734242X2110039
Author(s):  
Rita Fragoso ◽  
Ana Catarina Henriques ◽  
Javier Ochando-Pulido ◽  
Nicole Smozinski ◽  
Elizabeth Duarte
Keyword(s):  
Sewage Sludge ◽  
Production Rate ◽  
Methane Production ◽  
Loading Rate ◽  
Treatment Plant ◽  
Total Alkalinity ◽  
Organic Loading Rate ◽  
Olive Pomace ◽  
Two Phase ◽  
Biomethane Production

In this study, co-digestion of mixed sewage sludge from a wastewater treatment plant (WWTP) and partially dephenolised two-phase olive pomace (DOP) as a co-substrate was addressed with the aim of improving the biodigestibility of both substrates. The introduction of DOP into WWTP anaerobic digester facilities could significantly increase biomethane production and enhance the sustainability of both activities. An improvement in the system’s performance was supported by stability parameters: total alkalinity increased and stabilised with the addition of 5% v/v DOP, and the specific energy loading rate was maintained at 0.177 ± 0.03 d−1, which indicated better buffer capacity and stability in the bioreactor, and the possibility of enhancing the organic loading rate. In terms of average daily biogas production rate, an increase of 39% was achieved, up to 0.39 ± 0.11 L L−1d−1. Moreover, there was a 40% and 37% improvement in specific methane production and methane production rate, respectively, up to 0.28 ± 0.02 L CH4 g TVS−1 and 0.26 ± 0.08 L L−1d−1. In addition, the proposed strategy leads to an energy saving of 20,328.6 kWh year−1 at the WWTP as a result of the electric energy production surplus, corresponding to an annual saving of €3293.23.

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