Efficient aeration for biological wastewater treatment
Dr. Sebastian Felix Reinecke | Helmholtz-Zentrum Dresden-Rossendorf | Germany
Novel micro-orifice diffuser concepts and dynamic aeration for enhanced efficiency of biological treatment are proposed. Micro-orifice diffusers have up to 22% higher oxygen absorption at 51% less power demand compared to conventional spargers. Pulsed aeration modes show an increase of kLa by up to 24% and a potential reduction of the gas flow rate by 16% compared to continuous aeration.
Fenton based advanced oxidation processes for organics removal in reverse osmosis concentrate
Prof. Jiangyong Hu | National University of Singapore | Singapore
Advanced oxidation processes (AOPs) have been demonstrated as promising technologies for organics removal and biodegradability enhancement in Reverse Osmosis Concentrate (ROC). In the present study, both classic Fenton based AOP and fluidized bed reactor (FBR) Fenton processes were adopted. Process optimizations of the two Fenton processes were conducted with batch and continuous flow studies.
Treatment of phenol production wastewater with combined catalytic ozonation-biological process
Prof. Jiangyong Hu | National University of Singapore | Singapore
Ozonation is a well-known and widely applied advanced oxidation process (AOP) for industrial wastewater pretreatment. In this study, the phenol production wastewater was pre-treated with microbubble-catalytic ozonation process followed by anaerobic and aerobic biodegradation processes. The performance of the combined system in terms of organic removal was evaluated.
Photochemical Oxidation of Emerging Contaminants Using a Combination of Solar Irradiation and Free Available Chlorine
Prof. Dr. Xin Yang | Sun Yat-sen University | China
The degradation of 14 pharmaceuticals and personal care products (PPCPs) by using solar photolysis in the presence of free available chlorine (FAC) was investigated. Combining chlorination with sunlight may provide a simple and energy-efficient approach to improving the removal of organic contaminants during water treatment.
Performance and Mechanisms of Ultrafiltration Membrane Fouling Mitigation in a Novel Electrochemical Membrane Reactor (EMR)
Prof. Dr. Chengzhi Hu | Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences | China
Effective strategies for fouling mitigation are highly desirable to improve the efficiency and applicability of ultrafiltration (UF) systems.1 Applying EC as a pretreatment step is one of the promising solutions to control UF membrane fouling. The properties of flocs generated by EC have a significant influence on the structure of membrane cake layers and the extent of membrane fouling. Oxidation of HA can effectively alleviate membrane fouling due to the decrease of the molecular weight. By applying a dimensionally stable anode in an electrochemical reactor, direct oxidation would occur on the surface of the anode. In addition, if the electrolyte contained chloride ion, the chloride ion would be transformed into active chlorine and further oxidize foulants in solution. Besides, the applied electric field has also been considered as an efficient method to reduce membrane fouling, 2 which was distributed between electrodes in electrochemical system.
A novel electrochemical membrane reactor (EMR), in which electrochemical reaction (both coagulation and oxidation) were integrated into one reactor, was designed to reduce membrane fouling. The ultrafiltration (UF) membrane module was placed in the electric field zone between the electrodes in electrochemical system. EMR showed better anti-fouling performance with higher electric field due to the formation of a more polarized cake layer. The cake layer formed under higher electric field strengths showed higher porosity and hydrophilicity. Oxidation also modulated the porosity of the cake layer by breaking up humic acid (HA) molecules (i.e., carboxylic functional groups and aromatic structures). The formation of HA-floc in EC improved the hydrophilicity of the formed cake layer, leading to the enhanced alleviation of membrane fouling. Further, we proposed a novel electro membrane bioreactor (eMBR) that coupled the electrochemical process with membrane bioreactor (MBR). The removal rate of contaminates was enhanced and the evolution of the membrane fouling was mitigated by the electrochamical reactions (electrocoagulation and electroflotation) and the effect of the electric field between the electrodes. The released iron ions effectively inhibited the evolution of membrane fouling and improved the removal rate of phosphate. The polarized cake layer under electric field on the membrane surface exhibited a higher porosity, which benefited the water permeability. The activity of the microorganism was promoted and the production of extracellular polymeric substances (EPS) were reduced due to the effect of the micro electric field.The water flux and the total phosphorus (TP) removal in eMBR was 23.1% and ~50% higher in comparison with the traditional MBR, respectively.
Visible-light-driven photocatalytic disinfection on antibiotic resistant bacteria in secondary treated effluent
Prof. Dr. Yingxue Sun | Beijing Technology and Business University | China
Photocatalytic disinfection on antibiotic resistant bacteria isolated from treated secondary effluent by visible-light-responsive graphite carbon nitride (g-C3N4) was investigated in this study. The contribution of g-C3N4 to the visible driven light inactivation was 52%~63% compared to that light inactivation without g-C3N4 catalyst.
Water Structures & Membrane Systems - Rising Performance with Catalytic Water Treatment -
Jan Koppe | MOL Katalysatortechnik GmbH | Germany
This lecture will focus on the principles of membrane process and will show possibilities for making these processes more efficient and economical. After a short theoretical introduction on membrane processes, possibilities for increasing performance in industrial membrane systems will be shown together with industrial reference objects.
Biomass and lipid production of autotrophic oleaginous microalgae using leachate of saline-alkali land from Shandong Province
Prof. Dr. Yu HONG | Beijing Forestry University | China
In this study, biomass and lipid production of three oleaginous microalgae (Chlorella sp. HQ, Chlorella vulgaris, and Scenedesmus sp. LX1) autotrophically cultivated in leachate of saline-alkali land from Shandong Province were investigated to explore the feasibility that utilizing saline-alkali land leachate to cultivate microalgae. Based on the comprehensive comparison, Chlorella sp. HQ was more suitable to be cultivated in leachate of saline-alkali land and the cultivation efficiency of leachate is much better than microalgal culture medium considering not only biomass but also lipid content. Hence, using leachate of saline-alkali land is promising to save cost of microalgal cultivation and synchronously the leachates can be purified.