scholarly journals Optimizing the operational conditions of a membrane bioreactor used for domestic wastewater treatment

2005 ◽  
Vol 48 (spe) ◽  
pp. 119-126 ◽  
Author(s):  
Priscilla Zuconi Viana ◽  
Ronaldo Nobrega ◽  
Eduardo Pacheco Jordão ◽  
José Paulo Soares de Azevedo
Keyword(s):  
Municipal Wastewater ◽  
Membrane Surface ◽  
Domestic Wastewater ◽  
Transmembrane Pressure ◽  
Permeate Flux ◽  
Operational Parameters ◽  
Operational Conditions ◽  
Air Supply ◽  
Aeration System ◽  
Domestic Wastewater Treatment

This study evaluated the performance of a sidestream membrane module combined with an aeration system for the treatment of municipal wastewater. To investigate the membrane's behavior and to control fouling, trials in laboratory units were conducted. In these tests, optimal values were established for some operational parameters, such as crossflow velocity, transmembrane pressure and air supply to continuously flush the membrane surface. Air supply improved the behavior of the permeate flux over time. After six hours operation, the stabilized flux was 35 L/m².h at a total pressure of 0.40 bar (wastewater pressure of 0.05 bar and air pressure of 0.35 bar) and Reynolds Number of 4,600. All permeate samples analyzed indicated absence of fecal coliform and Escherichia coli.

scholarly journals Effects of Continuous Pollution by Pharmaceutical Micropollutants on the Fouling of a Membrane Bioreactor Treating Domestic Wastewater

2015 ◽  
Vol 28 (1) ◽  
pp. 51-56
Author(s):  
Chengcheng Li ◽  
Christelle Guigui ◽  
Corinne Cabassud
Keyword(s):  
High Performance ◽  
Biological Activities ◽  
Membrane Surface ◽  
Domestic Wastewater ◽  
Pharmaceutical Products ◽  
Size Exclusion ◽  
Transmembrane Pressure ◽  
Domestic Wastewater Treatment ◽  
Anti Epileptic Drug ◽  
Microbial Products

Membrane bioreactors (MBR) are increasingly used for domestic wastewater treatment and reuse and great concerns have been raised in the last decade about some emerging trace pollutants found in aquatic environment, notably pharmaceutical products. As a consequence, the removal of pharmaceutical micropollutants by MBRs has been extensively investigated but there is still a lack of knowledge on the effects of the current presence of pharmaceutical micropollutants in domestic wastewaters on MBR fouling. Among the different pharmaceuticals, it was decided to focus on carbamazepine (CBZ), an anti-epileptic drug, because of its occurrence in domestic wastewaters and persistence in biological processes including MBRs. The chemical analysis of soluble microbial products (SMPs) in the supernatant showed that a continuous introduction of CBZ into a submerged MBR via the feed (about 90 µg/L CBZ in the feed) led to a significant increase in the concentration of proteins whereas no significant change was found for polysaccharides. Size exclusion high performance liquid chromatography (HPLC-SEC) analysis showed that the addition of CBZ induced a significant increase of 10-100 kDa proteins in the supernatant and a slight decrease of 100-1000 kDa proteins. After addition of CBZ a significant increase of transmembrane pressure (TMP) in the MBR was observed, which indicates that the increase of the quantity of 10-100 kDa proteins led to a more severe fouling caused by internal fouling in the biocake that was formed on MBR membrane surface. This study also suggests that 10-100 kDa proteins might play a major role in the TMP jump phenomenon. Moreover it was found that addition of CBZ to the MBR affected the biological activities, as a slight inhibition of the exogenous respiration rate was observed.

Volatile organic compound emissions during the composting of biosolids from a domestic wastewater treatment plant

2002 ◽  
Vol 46 (10) ◽  
pp. 195-198 ◽  
Author(s):  
C.X. Ramos ◽  
S.L. Estévez ◽  
E. Giraldo
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Solid Phase ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Aeration System ◽  
Domestic Wastewater Treatment ◽  
Emission Behavior ◽  
Volatile Organic Compound Emissions ◽  
Aliphatic And Aromatic Hydrocarbons

VOCs emitted by two composting static piles of biosolids coming from the “El Salitre” wastewater treatment plant (Bogotá, Colombia) were analysed during the composting process. Each pile in its sampling time was maintained with a different aeration system. The sampling was made using Solid Phase Microextraction (SPME); separation and identifications were made using Gas Chromatography (GC) coupled to Mass Spectrometry (MS). Aliphatic and aromatic hydrocarbons, chlorinated compounds, ketones, mercaptans, alcohols and amines were identified in concentrations greater than the norms stipulated by the EPA for inhalation in humans beings. The emission behavior varied according to the aeration system used.

Performance of pilot Hybrid Reed Bed constructed wetland with aeration system on nutrient removal for domestic wastewater treatment

2020 ◽  
Vol 19 ◽  
pp. 100891 ◽  
Author(s):  
Omar Hamed Jehawi ◽  
Siti Rozaimah Sheikh Abdullah ◽  
Setyo Budi Kurniawan ◽  
Nur ‘Izzati Ismail ◽  
Mushrifah Idris ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Constructed Wetland ◽  
Nutrient Removal ◽  
Domestic Wastewater ◽  
Aeration System ◽  
Domestic Wastewater Treatment ◽  
Reed Bed

Immersed Membrane BioReactor (IMBR) for treatment of combined domestic and dairy wastewater in an isolated farm

2005 ◽  
Vol 51 (10) ◽  
pp. 327-334 ◽  
Author(s):  
A. Bick ◽  
J.G.P. Tuttle ◽  
S. Shandalov ◽  
G. Oron
Keyword(s):  
Membrane Bioreactor ◽  
Dairy Farm ◽  
Domestic Wastewater ◽  
High Strength ◽  
Dairy Farms ◽  
Pilot Scale ◽  
Dairy Wastewater ◽  
Transmembrane Pressure ◽  
Research Approach ◽  
Permeate Flux

In many regions dairy farms and milk processing industries discharge large quantities of their wastes to the surroundings posing serious environmental risks. This problem is mostly faced in small dairy farms and isolated communities lacking both central collection and conventional wastewater treatment systems. Dairy wastewater is characterized by high concentrations of organic matter, solids, nutrients, as well as fractions of dissolved inorganic pollutants, exceeding those levels considered typical for high strength domestic wastewaters. With the purpose of treating the combined dairy and domestic wastewater from a small dairy farm in the Negev Desert of Israel, the use of a recent emerging technology of Immersed Membrane BioReactor (IMBR) was evaluated over the course of 500 test hours, under a variety of wastewater feed quality conditions (during the test periods, the feed BOD5 ranged from 315 ppm up to 4,170 ppm). The overall performance of a pilot-scale Ultrafiltration (UF) IMBR process for a combined domestic and dairy wastewater was analyzed based on the Data Envelopment Analysis (DEA) method. The IMBR performance in terms of membrane performance (permeate flux, transmembrane pressure, and organic removal) and DEA model (Technical Efficiency) was acceptable. DEA is an empirically based methodology and the research approach has been found to be effective in the depiction and analysis for complex systems, where a large number of mutual interacting variables are involved.

Operation and Optimization of an Alternating Oxic-Anoxic Shortcut Nitrification-Denitrification System

2014 ◽  
Vol 1030-1032 ◽  
pp. 387-390
Author(s):  
Chun Di Gao ◽  
Shi Xin Fan ◽  
Er Long Jiao ◽  
Hao Li ◽  
Wei Xiao Wang
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Batch Reactor ◽  
Operation Mode ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Optimization Approach ◽  
Municipal Wastewater Treatment ◽  
Operational Parameters ◽  
Pollutant Discharge

A novel alternating oxic-anoxic operation mode of shortcut nitrification-denitrification was developed in a sequencing batch reactor at ambient temperature. Operational parameters favorable for maintaining the shortcut nitrification-denitrification were investigated and optimized. The experiments showed that alternating oxic-anoxic shortcut nitrification-denitrification system was able to be an independent treatment process in domestic wastewater treatment. And the optimization approach was so efficient that the main pollutant discharge targets achieved Standard A of the first class in "Discharge standard of pollutants for municipal wastewater treatment plant". Moreover, the reliability of the operation strategy in this experimentation was proved, which indicated the excellent nitrogen removal performances.

Surface water clarification by ultrafiltration with an immersed membrane system: effect of coagulation/aeration on flux enhancement

2003 ◽  
Vol 3 (5-6) ◽  
pp. 393-399 ◽  
Author(s):  
P. Choksuchart ◽  
M. Héran ◽  
A. Grasmick
Keyword(s):  
Ferric Chloride ◽  
Membrane Surface ◽  
Membrane System ◽  
Critical Conditions ◽  
Transmembrane Pressure ◽  
Permeate Flux ◽  
System Effect ◽  
Fiber Network ◽  
Membrane Cleaning ◽  
Concentrated Suspension

A new clarification system was developed to intensify a clarification step by ultrafiltration. Membrane modules equipped with capillary fibers were immersed in a reactor where a horizontal water circulation and a vertical air bubble circulation could assist in minimizing clogging inside the fiber network. Experiments were conducted with a clay particle suspension. Ferric chloride was added to induce coagulation of suspended particles. Results show that when filtering was operated under supracritical conditions clay deposit was observed on the membrane surface and a rapid increase in transmembrane pressure (TMP) value appeared. Air bubbling, and above all adding ferric chloride, allowed an actual enhancement of the filtering conditions. In optimal conditions, a very high concentrated suspension (5.0 g SS/L), filtering evolution was comparable to a clear water filtration until a 65 L/h/m2 permeate flux value (obtained under a 0.16 bar TMP), further a rapid fouling inside the fiber network appeared and obliged us to undertake specific membrane cleaning. The chosen membrane cleaning procedure showed that the particle deposit was the main fouling cause when filtering above the critical conditions.

The effect of operational conditions on the performance of UASB reactors for domestic wastewater treatment

2005 ◽  
Vol 52 (1-2) ◽  
pp. 299-305 ◽  
Author(s):  
R.C. Leitão ◽  
J.A. Silva-Filho ◽  
W. Sanders ◽  
A.C. van Haandel ◽  
G. Zeeman ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Municipal Wastewater ◽  
Domestic Wastewater ◽  
Pilot Scale ◽  
Cod Removal ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Operational Conditions ◽  
Cod Removal Efficiency ◽  
Uasb Reactors

In this investigation, the performance of Upflow Anaerobic Sludge Blanket (UASB) reactors treating municipal wastewater was evaluated on the basis of: (i) COD removal efficiency, (ii) effluent variability, and (iii) pH stability. The experiments were performed using 8 pilot-scale UASB reactors (120 L) from which some of them were operated with different influent COD (CODInf ranging from 92 to 816 mg/L) and some at different hydraulic retention time (HRT ranging from 1 to 6 h). The results show that decreasing the CODInf, or lowering the HRT, leads to decreased efficiencies and increased effluent variability. During this experiment, the reactors could treat efficiently sewage with concentration as low as 200 mg COD/L. They could also be operated satisfactorily at an HRT as low as 2 hours, without problems of operational stability. The maximum COD removal efficiency can be achieved at CODInf exceeding 300 mg/L and HRT of 6 h.

Influence of aeration and permeate flux on deposition of particulates on membrane surface

2010 ◽  
Vol 10 (6) ◽  
pp. 979-986
Author(s):  
Rupak Aryal ◽  
Saravanamuthu Vigneswaran ◽  
Jaya Kandasamy ◽  
Bivek Baral ◽  
Alain Grasmick
Keyword(s):  
Particle Deposition ◽  
Membrane Surface ◽  
Particle Diameter ◽  
Transmembrane Pressure ◽  
Physical Parameters ◽  
Permeate Flux ◽  
Composite Effect ◽  
Maximum Particle ◽  
The Difference ◽  
Two Parameters

In microfiltration, a deposit of foulant tends to form on the membrane surface and this usually controls the performance of the filtration process. This paper discusses the influence of physical parameters such as aeration and permeates flux on migration and deposition of above micron particles on the membrane surface. Kaolin clay suspension of particle 3.7–8 μm with mean particle diameter 4.1 μm was used in this study. Equal amount of mass of deposited particles on the membrane surface created different transmembrane pressure (TMP) when operated at different aeration rates and permeate flux showing that there is a composite effect. The particle deposition rate at the beginning at lower flux was almost linear which changed to a sharp logarithamic rise at higher flux. The difference in TMP rise for the same amount of deposit demonstrated the selective nature of particle deposition. The mass of the particle deposition on the membrane surface could be described by two parameters: maximum deposition and time using a simple empirical logarithamic equation y=k/[1+exp(b−at)], where k, a, and b are constant; y is the particulate mass deposit (g/m2) and t is the time. The maximum particle mass deposition growth could be described by the equation dy/dt=1/4ka.

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