scholarly journals Improving membrane fouling control by maximizing the impact of air bubbles shear in a submerged plate-and-frame membrane module

2017 ◽  
Author(s):  
A. Eliseus ◽  
M. R. Bilad
Keyword(s):  
Membrane Fouling ◽  
Membrane Module ◽  
Air Bubbles ◽  
Fouling Control ◽  
Submerged Plate ◽  
The Impact

Finned spacer for enhancing the impact of air bubbles for membrane fouling control in Chlorella vulgaris filtration

2020 ◽  
Vol 11 ◽  
pp. 100429 ◽  
Author(s):  
Nik Nurul Ain Nabilah Razak ◽  
Ratri Rahmawati ◽  
Muhammad Roil Bilad ◽  
Amalia Enggar Pratiwi ◽  
Muthia Elma ◽  
...  
Keyword(s):  
Chlorella Vulgaris ◽  
Membrane Fouling ◽  
Air Bubbles ◽  
Fouling Control ◽  
The Impact

scholarly journals Maximizing the Impact of Air Bubbles for Membrane Fouling Control in Microalgae Harvesting

2017 ◽  
Vol 78 (1) ◽  
Author(s):  
Arthur Eliseus ◽  
Muhammad Roil Bilad
Keyword(s):  
Membrane Fouling ◽  
Membrane Surface ◽  
Air Bubbles ◽  
Membrane Cleaning ◽  
Shear Rates ◽  
Fouling Control ◽  
Microalgae Harvesting ◽  
Switching Mode ◽  
The Impact ◽  
Better Than

Harvesting microalgae using membrane is challenging due to the nature of microalgae having very high membrane fouling potential. Numerous techniques have been proposed for membrane fouling control, including optimizing operational cycles, imposing shear-rates via air bubbles and dosing chemicals for feed conditioning and membrane cleaning. As an established  method, the eficacy of air bubbles for membrane fouling control can be improved by maximizing the impact of shear-rates in  scouring foulant from the membrane surface. In this study, we investigate the effect of tilting angles, switching periods as well as aeration rates in a lab-scale submerged iltration system by iltering microalgae solution. Results showed that higher tilting angles improve the cleaning eficiency by offering higher lux of up to 2.7 times at an angle of 20◦ as opposed to the vertical one. It was also found that operating a one-sided panel (without switching) was about 20% better than a two-sided panel, in which the latter involved switching mode to offer aeration of both panel sides. This technique is effective in controlling fouling and can lead to energy saving for full-scale modules.

scholarly journals Patterned Membrane in an Energy-Efficient Tilted Panel Filtration System for Fouling Control in Activated Sludge Filtration

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 432 ◽  
Author(s):  
Aisyah Osman ◽  
Normi Izati Mat Nawi ◽  
Shafirah Samsuri ◽  
Muhammad Roil Bilad ◽  
Norazanita Shamsuddin ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Membrane Fouling ◽  
Membrane Surface ◽  
Aeration Rate ◽  
Membrane Bioreactors ◽  
Widespread Application ◽  
Membrane Area ◽  
Surface Corrugation ◽  
Fouling Control ◽  
The Impact

A membrane bioreactor enhances the overall biological performance of a conventional activated sludge system for wastewater treatment by producing high-quality effluent suitable for reuse. However, membrane fouling hinders the widespread application of membrane bioreactors by reducing the hydraulic performance, shortening membrane lifespan, and increasing the operational costs for membrane fouling management. This study assesses the combined effect of membrane surface corrugation and a tilted panel in enhancing the impact of air bubbling for membrane fouling control in activated sludge filtration, applicable for membrane bioreactors. The filterability performance of such a system was further tested under variable parameters: Filtration cycle, aeration rate, and intermittent aeration. Results show that a combination of surface corrugation and panel tilting enhances the impact of aeration and leads to 87% permeance increment. The results of the parametric study shows that the highest permeance was achieved under short filtration–relaxation cycle of 5 min, high aeration rate of 1.5 L/min, and short switching period of 2.5 min, to yield the permeances of 465 ± 18, 447 ± 2, and 369 ± 9 L/(m2h bar), respectively. The high permeances lead to higher operational flux that helps to lower the membrane area as well as energy consumption. Initial estimation of the fully aerated system yields the energy input of 0.152 kWh/m3, much lower than data from the full-scale references of <0.4 kWh/m3. Further energy savings and a lower system footprint can still be achieved by applying the two-sided panel with a switching system, which will be addressed in the future.

Control Of Surface Fouling Of Membrane Modules In Membrane Bioreactors

2019 ◽  
pp. 88-92
Keyword(s):  
Membrane Fouling ◽  
Biomass Accumulation ◽  
Membrane Bioreactors ◽  
Membrane Module ◽  
Factors Affecting ◽  
Fouling Control ◽  
A Value ◽  
Aeration System ◽  
Membrane Modules ◽  
Positive Effect

The article considers the approaches in the field of membrane fouling control in membrane bioreactors used for wastewater treatment. It is highlighted that a significant number of research world-wide is devoted to the study of membrane fouling, which makes it possible to point out and identify the main factors affecting membrane fouling. Generally, such factors are the parameters of operation of the biological treatment reactor with a submerged membrane module, the properties of the biomass of activated sludge, as well as the characteristics of the membranes themselves, while the process of fouling is a three-stage mechanism. This article considers two approaches to control the process of the surface fouling of membrane modules: by improving the functioning of the aeration system and using floating biomass carriers. For aeration systems the concept of the minimum allowable aeration intensity is defined as a value which positively affects the reduction of fouling. The use of biomass carriers in addition to the function of biomass accumulation makes it possible to create additional shear forces on the surface of the membrane module, which contribute to more intensive removal of contaminants from the surface. It is established that the combination of several ways to control fouling is particularly effective, which has a positive effect on the operation of the treatment systems.

scholarly journals Effect of IX dosing on polypropylene and PVDF membrane fouling control

2013 ◽  
Vol 47 (11) ◽  
pp. 3827-3834 ◽  
Author(s):  
Darli Theint Myat ◽  
Max Mergen ◽  
Oliver Zhao ◽  
Matthew B. Stewart ◽  
John D. Orbell ◽  
...  
Keyword(s):  
Membrane Fouling ◽  
Pvdf Membrane ◽  
Fouling Control

scholarly journals Effect of Pre-Oxidation on Coagulation/Ceramic Membrane Treatment of Yangtze River Water

Membranes ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 369
Author(s):  
Shengji Xia ◽  
Xinran Zhang ◽  
Yuanchen Zhao ◽  
Fibor J. Tan ◽  
Pan Li ◽  
...  
Keyword(s):  
Water Treatment ◽  
Membrane Fouling ◽  
Membrane Filtration ◽  
Ceramic Membrane ◽  
Membrane Separation ◽  
Membrane System ◽  
Coagulation System ◽  
Fouling Control ◽  
Filtration System ◽  
Membrane Treatment

The membrane separation process is being widely used in water treatment. It is very important to control membrane fouling in the process of water treatment. This study was conducted to evaluate the efficiency of a pre-oxidation-coagulation flat ceramic membrane filtration process using different oxidant types and dosages in water treatment and membrane fouling control. The results showed that under suitable concentration conditions, the effect on membrane fouling control of a NaClO pre-oxidation combined with a coagulation/ceramic membrane system was better than that of an O3 system. The oxidation process changed the structure of pollutants, reduced the pollution load and enhanced the coagulation process in a pre-oxidation-coagulation system as well. The influence of the oxidant on the filtration system was related to its oxidizability and other characteristics. NaClO and O3 performed more efficiently than KMnO4. NaClO was more conducive to the removal of DOC, and O3 was more conducive to the removal of UV254.

Sign in / Sign up

Export Citation Format

Share Document