Challenges in Filtration & Separation – Clean Environment
Professor Chung-Hak Lee
School of Chemical & Biological Engineering, Seoul National University, Korea
Title: Origin and Evolution of Quorum Quenching Technology for Biofouling Control in Membrane Bioreactor for Wastewater Treatment
Professor Lee received PhD from INSA de Toulouse, France in 1980. He was a chairman at Membrane Technology Specialist Group (2010~2013) and now a fellow in International Water Association (IWA). He devoted himself to the development of membrane-based innovative water/wastewater technologies. Particularly, he champions the field of Quorum Quenching that links molecular biology and engineering sciences to control a chronic problem of biofouling in the operation of membrane bioreactor (MBR). Since 2010, the so-called ‘QQ-MBR’ has been propagating worldwide in academic and industrial sectors as well. He received ‘The 4th Membrane Technology Award’ in 2017 by IWA for his outstanding and innovative contribution to membrane biofouling control using quorum sensing.
Biofouling has been conceived as one of the main obstacles in the development of membrane processes for water & wastewater treatments. Many researchers have made efforts to mitigate biofouling in various ways, for example, through the change in membrane material, addition of additives or media, changes in system design or operation mode, etc. However, such physico-chemical or engineering approaches to biofouling problem might not be fundamental solutions. It is because biofouling is an intrinsic natural phenomenon taking place in a ‘complex microbial living community’. In 2008, a revolutionary anti-fouling strategy for the control of membrane biofouling was proposed by applying the quorum quenching (QQ), i.e., stopping chatter or the disruption of quorum sensing (QS) between microorganisms, which regulates their group behaviors including biofilm formation via the secretion of extracellular polymeric substances (EPS). Since then, QQ-Technology for biofouling control has made progress continuously in terms of QQ-Microorganisms (Bacteria or Fungi), QQ-Enzyme (Endo or Exo-enzyme), QS-Signal molecules (AHLs or AI-2) and QQ-Media. In this presentation, behind stories during the evolution of QQ-Technology for biofouling control will be disclosed from its birth to present status.
Dr. Tao Zhang
Director, Gas Turbine Research Institute
Guodian Science and Technology Research Institute, Nanjing, Jiangsu, China
Title: Water endurance test for air filter elements used in the inlet system of gas turbine
The operating environment of rotating machinery including gas turbine and air intake filtration unit is complicated and challenging. Water endurance performance of air filter elements shall be considered besides assessing the performance of initial pressure drop, filtration efficiency and dust-holding capacity, especially the air filter elements are used in high-humidity environments or intake air contains a large quantity of liquid droplets. At present, ISO/NP 29461-7：Water endurance test for air filter elements have been initiated by GUODIAN testing laboratory of China since 2015. The standard would provide a water endurance test method for filter elements and can be used for evaluating performance variation trend of filter elements when encounter water and fog. The current research results of the standard will be shown in the KFS International Conference.
Professor Feng Xin
Air Cleaning Technique Center, China Academy of Building Research
Title: Challenges and efforts against indoor PM contamination in China
Particulate Matter (PM) pollution of the environmental air is now a critical issue in China and other developing countries. This leads to enormous demands on all kinds of air cleaning equipments. Thus a more scientific standardized method on performance evaluation of such instruments should be developed. Gaps between the measurement results based on new published ISO standards and the real PM remove performance and life cycle energy consumption for air cleaners and filters still exist. The IPA conditioning test would limit rather than properly guide the development of the industry. In China, monitoring on indoor/outdoor atmospheric particle number size distribution from 10nm to 10μm under different PM2.5 concentration levels was conducted from 2015 to 2017. Research effort on new challenge aerosol and filter test method was then started. Novel technology and equipment improving the real life performance of charged filer media are developed and applied. All the works would be the first step on the right direction to improve the international standards.
Dr. Khuong Trung Thuy
Deputy CEO, Orient Oil & Gas Joint Stock Company
Hung Phu 2A IP, Can Tho City, Vietnam
Title: New technology filtration and separation systems at the first Sorbitol production plant in Vietnam
Filtration and separation systems play an importance role in the sorbitol plant. Filtration and separation technology in the sorbitol production plant was used to separate liquid/solids phase. In the sorbitol production plant glucose clarification is a combination of two filtration types permitting to remove all the suspended solids/high molecular weight molecules from the products.
The first filtration is done by press filters (frontal filtration) and the second one is done by ceramic membrane (tangential filtration).The press filters treat the product coming from saccharification unit mixed with the retentate from tangential filtration. After being processed through press filters, the syrup is processed through tangential filtration unit. The tangential filtration unit was the first use in the sorbitol plant by ceramic membrane. This module has been recognized by the industry for their quality and robustness for decades. Their optimized design ensures high cleanability and excellent performance in operations.
In the hydrogenation glucose to sorbitol unit, the second filtration process was used to separate catalyst and sorbitol.