scholarly journals Intermittent Aeration in a Hybrid Moving Bed Biofilm Reactor for Carbon and Nutrient Biological Removal

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 492 ◽  
Author(s):  
Gaetano Di Bella ◽  
Giorgio Mannina
Keyword(s):  
Loading Rate ◽  
Nitrogen Loading ◽  
Biofilm Reactor ◽  
Operating Conditions ◽  
Organic Loading Rate ◽  
Intermittent Aeration ◽  
Moving Bed Biofilm Reactor ◽  
Moving Bed ◽  
Operational Conditions ◽  
N Removal

The paper presents an experimental study on a lab scale hybrid moving bed biofilm reactor with intermittent aeration. Specifically, a comparison between two different operating conditions was analyzed: continuous and intermittent aeration. Both continuous and intermittent aeration were monitored and compared in order to get the best operational conditions. The intermittent aeration campaign was sub-divided in three phases with different duration of alternation of aerobic and anoxic times and organic and nitrogen loading rates. The efficiency of N-removal improved by 70% during the intermittent aeration. The best condition was observed with 40 min of aeration and 20 min of no-aeration, an organic loading rate of 2.2 kgCODm−3day−1 and a nitrogen loading rate of 0.25 kgNm−3day−1: under these operational conditions the removal efficiencies for carbon and nitrogen were 93% and 90%, respectively. The derived results provide the basis for WWTP upgrade in order to meet stricter effluent limits at low energy requirements.

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.

Anaerobic treatment of vinasses by a sequentially mixed moving bed biofilm reactor

2007 ◽  
Vol 56 (2) ◽  
pp. 1-7 ◽  
Author(s):  
C. Sheli ◽  
R. Moletta
Keyword(s):  
Mixing Time ◽  
Anaerobic Treatment ◽  
Biofilm Reactor ◽  
Organic Loading Rate ◽  
Total Biomass ◽  
Moving Bed Biofilm Reactor ◽  
Specific Density ◽  
Moving Bed ◽  
Biofilm Carrier ◽  
Distillery Wastewater

Wine distillery wastewater, commonly called vinasses, was treated by an anaerobic moving bed biofilm reactor (AMBBR) with 32.9 litre available volume. The reactor was filled with 66% cylindrical polyethylene supports with density 0.84 g cm−3 as a biofilm carrier. The reactor was sequentially mixed by a submerged centrifugal pump fixed to the bottom, and each mixing time just lasted 1.25 minutes. The organic loading rate (OLR) of the reactor were increased from 1.6 to 29.6 g sCOD l−1 d−1 (soluble chemical oxygen demands −sCOD) and hydraulic retention time (HRT) was decreased from 6.33 to 1.55 days accordingly. Soluble COD removal efficiency was 81.3–89.2% at an OLR of 29.6 g sCOD l−1d−1. At the end of the experiment, 83.4% total biomass was attached on support and the specific density of support in the reactor was 0.93–1.05 g cm−3, which increased by about 10.7–25% compared with that at the beginning of the study.

Effect of reflux ratio on COD and nitrogen removals from coke plant wastewaters

2010 ◽  
Vol 61 (12) ◽  
pp. 3017-3025 ◽  
Author(s):  
X. L. Shi ◽  
X. B. Hu ◽  
Z. Wang ◽  
L. L. Ding ◽  
H. Q. Ren
Keyword(s):  
Removal Efficiency ◽  
Significant Influence ◽  
Coke Plant ◽  
Biofilm Reactor ◽  
Laboratory Scale ◽  
Reflux Ratio ◽  
Moving Bed Biofilm Reactor ◽  
Moving Bed ◽  
N Removal ◽  
Removal Efficiencies

A laboratory-scale anaerobic-anoxic-aerobic-moving bed biofilm reactor (A1-A2-O-MBBR) system was undertaken to treat coke plant wastewaters from two different factories (wastewater A and B). Wastewater B had higher BOD5/COD ratio and COD/TN ratio than wastewater A. The effects of reflux ratios on COD, TN and NH3-N removals were studied. Results indicated that, with the reflux ratio increased from 2 to 5, COD removals of wastewater A and wastewater B increased from 57.4% to 72.6% and 78.2% to 88.6%, respectively. Meanwhile, TN removals were also increased accompanying reflux ratio rise, from 53.1% to 74.4% for wastewater A and 64.2% to 83.5% for wastewater B. At the same reflux ratio, compared with wastewater A, higher COD and TN removal efficiencies were observed in wastewater B, which had higher BOD5/COD and COD/TN ratio. Reflux ratio had no significant influence on NH3-N removal; 99.0% of the overall NH3-N removal efficiency was achieved by the system for both coke plant wastewaters at any tested reflux ratio. MBBR was effective in NH3-N removal, and about 95% of the NH3-N was removed in the MBBR.

Treatment of Tannery Wastewater and Moving-Bed Biofilm Reactor

2020 ◽  
Vol 17 ◽  
Author(s):  
Henrique Rech ◽  
Caroline Agustini ◽  
Mariliz Gutterres
Keyword(s):  
Activated Sludge ◽  
Surface Area ◽  
Biofilm Reactor ◽  
Operating Conditions ◽  
Tannery Wastewater ◽  
Organic Load ◽  
Moving Bed Biofilm Reactor ◽  
Leather Industry ◽  
Filling Fraction ◽  
Moving Bed

Abstract:: The leather industry is a fundamental sector, especially in countries with highly developed livestock as they use rawhide to produce high-value leather products. The leather-making process uses different chemicals and is a source of environmental pollution if the wastewater is not properly treated. Therefore, the purpose of this study is to analyze a Moving- Bed Biofilm Reactor (MBBR) as a new technology for the biological treatment of tannery wastewater. This system incorporates benefits provided by suspended growth systems, which are already consolidated in treating wastewater, including activated sludge and the advantage of growth adhered to biocarriers that have a large surface area. Therefore, incorporating activated sludge into MBBR enables the removal of both organic and nitrogen pollutants. Studies have shown that MBBR treatment efficiency depends on biocarrier surface area, composition, texture, and reactor operating conditions, such as filling fraction, hydraulic retention time, dissolved oxygen, and volumetric organic load.

Experimental Study on Treatment of Wastewater Containing Oil and Polyacrylamide by Aerobic and Anaerobic Bacteria

2014 ◽  
Vol 675-677 ◽  
pp. 539-542 ◽  
Author(s):  
Guang Meng Ren ◽  
Yu Pan ◽  
Xiu Min Yang ◽  
Yan Yun Qiao ◽  
Hong Wei Li ◽  
...  
Keyword(s):  
Anaerobic Bacteria ◽  
Biofilm Reactor ◽  
Operating Conditions ◽  
Moving Bed Biofilm Reactor ◽  
Moving Bed ◽  
Effluent Quality ◽  
Sulphate Reducing Bacteria ◽  
Reducing Bacteria ◽  
Aerobic And Anaerobic

Wastewater containing oil and polyacylamide is a kind of organic wastewater, which is hard to treat. The combined process of moving-bed biofilm reactor and sulphate-reducing bacteria was used to treat the wastewater. Operating conditions of moving-bed biofilm reactor and sulphate-reducing bacteria were studied. Results indicate that the oil removal efficiency by moving-bed biofilm reactor can reach above 90% with 9 hours hydraulic retention time at 25°C, but it has no effect on polyacylamide. Sulphate-reducing bacteria can degrade polyacylamide, and polyacylamide conversion is about 50% at 37°C with 4 days culture time and 9ml inoculation size. The effluent quality of wastewater containing oil and polyacylamide can meet requirements of the first level in integrated wastewater discharge standard.

Effect of organic loading rate on a wastewater treatment process combining moving bed biofilm and membrane reactors

2005 ◽  
Vol 51 (6-7) ◽  
pp. 421-430 ◽  
Author(s):  
E. Melin ◽  
T. Leiknes ◽  
H. Helness ◽  
V. Rasmussen ◽  
H. Ødegaard
Keyword(s):  
Membrane Fouling ◽  
Loading Rate ◽  
Biofilm Reactor ◽  
Cod Removal ◽  
High Rate ◽  
Organic Loading Rate ◽  
Membrane Pore ◽  
Moving Bed ◽  
Loading Rates ◽  
Removal Efficiencies

The effect of moving bed biofilm reactor (MBBR) loading rate on membrane fouling rate was studied in two parallel units combining MBBR and membrane reactor. Hollow fiber membranes with molecular weight cut-off of 30 kD were used. The HRTs of the MBBRs varied from 45 min to 4 h and the COD loading rates ranged from 4.1 to 26.6 g COD m−2 d−1. The trans-membrane pressure (TMP) was very sensitive to fluxes for the used membranes and the experiments were carried out at relatively low fluxes (3.3–5.6 l m−2 h−1). Beside the test with the highest flux, there were no consistent differences in fouling rate between the low- and high-rate reactors. Also, the removal efficiencies were quite similar in both systems. The average COD removal efficiencies in the total process were 87% at 3–4 h HRT and 83% at 0.75–1 h HRT. At high loading rates, there was a shift in particle size distribution towards smaller particles in the MBBR effluents. However, 79–81% of the COD was in particles that were separated by membranes, explaining the relatively small differences in the removal efficiencies at different loading rates. The COD fractionation also indicated that the choice of membrane pore size within the range of 30 kD to 0.1 μm has very small effect on the COD removal in the MBBR/membrane process, especially with low-rate MBBRs.

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