Experimental Study on the Rapid Start-Up of Two-Phase Anaerobic Reactor Treating Domestic Sewage

2013 ◽  
Vol 448-453 ◽  
pp. 589-595
Author(s):  
Zhi Li Chen ◽  
Zhen Jie Ren ◽  
Yang Yao ◽  
Yi Yang ◽  
Wan Tu Zhang
Keyword(s):  
Loading Rate ◽  
Kinetic Method ◽  
Oxygen Demand ◽  
Domestic Sewage ◽  
Gas Production ◽  
Two Phase ◽  
Anaerobic Reactor ◽  
Start Up ◽  
Volumetric Loading ◽  
Chemical Oxygen Demand Concentration

An integrated two-phase anaerobic reactor was designed to treat domestic sewage, and the corresponding start-up process was investigated.In this investigation, the volumetric loading rate ( VLR) of the system was raised by basically maintaining the influent COD ( Chemical Oxygen Demand) concentration and gradually decreasing the hydraulic retention time (HRT) at 35°C，and the start-up process was completed only in the 36 days. When the Influent pH was kept in the range of 7.39 ~ 7.67，the acidogenic phase and the methanogenic phaseof integrated two-phase anaerobic reactor were separated only by using the kinetic method. After completing this process, the reactor operated well with VLR at 1.31 kg / ( m3·d) and HRT at about 7h, and a COD removal of more than 80%,a SS removal of about 90% and a gas production rate of about 0.31L/h were respectively achieved.

COD removal efficiency and mechanism of HMBR in high volumetric loading for ship domestic sewage treatment

2016 ◽  
Vol 74 (7) ◽  
pp. 1509-1517 ◽  
Author(s):  
Linan Zhu ◽  
Hailing He ◽  
Chunli Wang
Keyword(s):  
Removal Efficiency ◽  
Removal Rate ◽  
Sewage Treatment ◽  
Oxygen Demand ◽  
Domestic Sewage ◽  
Cod Removal ◽  
Aeration Tank ◽  
Remarkable Effect ◽  
Cod Removal Efficiency ◽  
Volumetric Loading

The hybrid membrane bioreactor (HMBR) has been applied in ship domestic sewage treatment under high volumetric loading for ship space saving. The mechanism and influence factors on the efficiency, including hydraulic retention time (HRT), dissolved oxygen (DO) of chemical oxygen demand (COD) removal were investigated. The HMBR's average COD removal rate was up to 95.13% on volumetric loading of 2.4 kgCOD/(m3•d) and the COD concentration in the effluent was 48.5 mg/L, far below the International Maritime Organization (IMO) discharge standard of 125 mg/L. DO had a more remarkable effect on the COD removal efficiency than HRT. In addition, HMBR revealed an excellent capability of resisting organics loading impact. Within the range of volumetric loading of 0.72 to 4.8 kg COD/(m3•d), the effluent COD concentration satisfied the discharge requirement of IMO. It was found that the organics degradation in the aeration tank followed the first-order reaction, with obtained kinetic parameters of vmax (2.79 d−1) and Ks (395 mg/L). The original finding of this study had shown the effectiveness of HMBR in organic contaminant degradation at high substrate concentration, which can be used as guidance in the full scale of the design, operation and maintenance of ship domestic sewage treatment devices.

Research on the Start-Up Effect of Two-Phase Anaerobic Baffled Reactor

2013 ◽  
Vol 448-453 ◽  
pp. 600-603
Author(s):  
Ling Jing ◽  
Xin Xia Wang
Keyword(s):  
Wastewater Treatment ◽  
Ph Value ◽  
Removal Rate ◽  
Limiting Factors ◽  
Small Cities ◽  
Two Phase ◽  
Anaerobic Reactor ◽  
Anaerobic Baffled Reactor ◽  
Low Concentration ◽  
Start Up

Aiming at the fact that the low concentration sewage in small cities, this paper presents Two-phase Anaerobic Baffled Reactor (TAABR) for living wastewater treatment, importantly, it designs and researches Two-phase Anaerobic Baffled Reactor and its advantages, designs a trial project according to the characteristics of the reactor equip. The experiment uses the method that by shortening HRT to raise the load to start and analyses the operating results during startup as follows: 1. 53 days later anaerobic reactor start-up successes.2. When the load is 0.5kgCOD/m3.d, the removal rate of COD is more than 80%. 3. PH value is not the main limiting factors during start up in the reactor and there is basically no danger of excessive acidification.

scholarly journals Suitability of olive oil washing water as an electron donor in a feed batch operating bio-electrochemical system

2017 ◽  
Vol 68 (2) ◽  
pp. 198 ◽  
Author(s):  
F. G. Fermoso ◽  
M. J. Fernández-Rodríguez ◽  
A. Jiménez-Rodríguez ◽  
A. Serrano ◽  
R. Borja
Keyword(s):  
Olive Oil ◽  
Electron Donor ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Electrochemical System ◽  
Two Phase ◽  
Inhibitory Compounds ◽  
Start Up ◽  
Voltage Potential ◽  
Washing Water

Olive oil washing water derived from the two-phase manufacturing process was assessed as an electron donor in a bio-electrochemical system (BES) operating at 35 ºC. Start-up was carried out by using acetate as a substrate for the BES, reaching a potential of around +680 mV. After day 54, BES was fed with olive oil washing water. The degradation of olive oil washing water in the BES generated a maximum voltage potential of around +520 mV and a Chemical Oxygen Demand (COD) removal efficiency of 41%. However, subsequent loads produced a decrease in the COD removal, while current and power density diminished greatly. The deterioration of these parameters could be a consequence of the accumulation of recalcitrant or inhibitory compounds, such as phenols. These results demonstrated that the use of olive oil washing water as an electron donor in a BES is feasible, although it has to be further investigated in order to make it more suitable for a real application.

scholarly journals Sustainable Bio-methane generation from Petrochemical Wastewater using CSTR

2014 ◽  
Vol 1 (1) ◽  
pp. 1-4
Author(s):  
Md. Nurul Islam Siddique ◽  
Zularisham A. Wahid
Keyword(s):  
Wastewater Treatment ◽  
Loading Rate ◽  
Biogas Production ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Organic Loading Rate ◽  
Petrochemical Wastewater ◽  
Methane Generation ◽  
Start Up ◽  
Thermophilic Condition

The effect of gradual increase in organic loading rate (0LR) and temperature on biomethanation from petrochemical wastewater treatment was investigated using CSTR. The digester performance measured at hydraulic retention time (HRT) of4 to 2d, and start up procedure of the reactor was monitoredfor 60 days via chemical oxygen demand (COD) removal, biogas and methane production. By enhancing the temperature from 30 to 55 “C Thermophilic condition was attained, and pH was adjusted at 7 i 0.5. Supreme COD removal competence was 98i0.5% (r = 0.84) at an 0LR of 7.5 g-COD/Ld and 4d HRT. Biogas and methane yield were logged to an extreme of 0.80 L/g-CODremoved d (r = 0.81), 0.60 L/g-CODremoved d (r = 0.83), and mean methane content of biogas was 65.49%. The full acclimatization was established at 55 C with high COD removal efficiency and biogas production. An 0LR of 7.5 g-COD/L d and HRT of 4 days were apposite forpetrochemical wastewater treatment.

Start-up of full-scale anaerobic digesters treating municipal solid waste

2003 ◽  
Vol 48 (4) ◽  
pp. 249-252 ◽  
Author(s):  
T. Ohmura ◽  
T. Sakai ◽  
Y. Shindo ◽  
K. Nakamura ◽  
T. Ike ◽  
...  
Keyword(s):  
Loading Rate ◽  
Gas Production ◽  
Full Scale ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Methane Fermentation ◽  
Start Up ◽  
Direct Technique ◽  
Short Period ◽  
Sludge Recycling

Raising organic loading rate, and the behavior of dissolved CODcr (D-CODcr), VFA and specific methanogen activity, were investigated through a laboratory experiment for the start-up of a sludge recycling center. Moreover, application for MPN-PCR methods using a gene as a direct technique to measure the quantity of methanogen was attempted. It was recognized that specific methanogen activity depends on the quantity of methanogen, and that gas production does not reflect the condition of methane fermentation. The methane fermentation condition was checked through the specific methanogen activity and analysis of D-CODcr. The target organic loading rate was reached in the short period of about 30 days, and rapid start-up was successfully attained for a full-scale anaerobic digester.

Factors Influencing Formation and Maintenance of Granules in Anaerobic Sludge Blanket Reactors (UASBR)

1990 ◽  
Vol 22 (9) ◽  
pp. 275-282 ◽  
Author(s):  
N. Kosaric ◽  
R. Blaszczyk ◽  
L. Orphan
Keyword(s):  
Loading Rate ◽  
Gas Production ◽  
Anaerobic Sludge ◽  
Hydrodynamic Conditions ◽  
Bed Height ◽  
Factors Influencing ◽  
Volumetric Loading ◽  
Anaerobic Sludge Blanket ◽  
Uasb Reactors ◽  
Granule Growth

Four, 20 L UASB reactors were operated under different hydrodynamic regimes continuously for more than 150 days. The influence of superficial liquid upflow velocities over the range 0.2 5 to 1.5 m h−1, on granule activity and characteristics was investigated, maintaining constant temperature (35°C), and volumetric loading rate (6.2 g COD L−1 day−1). Reactor pH, COD removal, VFA concentration, bed height and gas production were continuously monitored and evaluated. It was found that hydrodynamic conditions can influence the size of granules, and their settling characteristics. Low upflow velocities (0.25 and 0.5 m h−1), are favourable for granule growth and accumulation. At high upflow velocities (1.0 and 1.5 m h−1), no sludge accumulation and disintegration of larger granules were observed.

Start up of an anaerobic inverse turbulent bed reactor fed with wine distillery wastewater using pre-colonised bioparticles

2005 ◽  
Vol 51 (1) ◽  
pp. 153-158 ◽  
Author(s):  
C. Arnaiz ◽  
S. Elmaleh ◽  
J. Lebrato ◽  
R. Moletta
Keyword(s):  
Industrial Wastewater ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Oxygen Demand ◽  
Anaerobic Treatment ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Biofilm Reactors ◽  
Start Up ◽  
Distillery Wastewater

The long start-up period of fluidized bed biofilm reactors is a serious obstacle for their wide installation in the anaerobic treatment of industrial wastewater. This paper presents the results of an anaerobic inverse turbulent bioreactor treating distillery wastewater during 117 days of operation at a laboratory scale. The pre-colonized bioparticles for this work were obtained from a similar reactor processing the same wastewater and which had a start-up period of 3 months. The system attained carbon removal efficiency rates between 70 and 92%, at an organic loading rate of 30.6 kg m+3 d+1 (chemical oxygen demand) with a hydraulic retention time of 11.1 h. The results obtained showed that the start-up period of this kind of reactors can be reduced by 3 using pre-colonized bioparticles.

scholarly journals Effect of Volume Loading Rate and C/N on Ship Domestic Sewage Treatment by Two Membrane Bioreactors

2019 ◽  
Vol 64 (3) ◽  
pp. 328-339
Author(s):  
Yuhang Cai ◽  
Asad A. Zaidi ◽  
Peiqi Sun ◽  
Yue Shi ◽  
Kun Zhang ◽  
...  
Keyword(s):  
Membrane Reactor ◽  
Urease Activity ◽  
Suspended Solids ◽  
Loading Rate ◽  
Sewage Treatment ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Domestic Sewage ◽  
Volume Loading ◽  
Interesting Phenomenon

Design of ship sewage treatment systems that not only satisfy the use of small space on board but also meets International Maritime Organisation (IMO) latest emission standards is still a challenging problem for ship industry. This study provides a comparative disquisition between two different MBR reactors i.e, air-lift multilevel circulation membrane reactor (AMCMBR) and anaerobic/anoxic/aerobic membrane reactor (AOA-MBR) for domestic sewage treatment. The influence of pollutants volume loading rate (VLR) and C/N on effluent chemical oxygen demand (COD), ammonium nitrogen (NH4+-N) and TN for marine domestic sewage was analyzed. The results revealed that AMCMBR showed better removal efficiencies for COD and TN than AOA-MBR. The volume of AMCMBR was only half of the AOA-MBR. In addition, high average value of mixed liquor volatile suspended solids (MLVSS)/mixed liquid suspended solids (MLSS) (i.e. 0.75) of AMCMBR indicated high biomass and good pollutants removal achieved by this reactor. An interesting phenomenon was found in the study regarding Urease activity for the two reactors. Urease activity for AMCMBR in different working conditions all exceeded AOA-MBR and there exist no clear difference of NR activities between AMCMBR and AOA-MBR except for low C/N ratio (i.e. 6 and 4). This phenomenon proved that AMCMBR has a greater performance for treating ship domestic wastewater.

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.

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