Investigation on effects of aggregate structure in water and wastewater treatment

2004 ◽  
Vol 50 (12) ◽  
pp. 119-124 ◽  
Author(s):  
K.W. Chau
Keyword(s):  
Wastewater Treatment ◽  
Membrane Fouling ◽  
Water And Wastewater Treatment ◽  
Aggregate Structure ◽  
Bacterial Surface ◽  
Filtration Membrane ◽  
Treatment Processes ◽  
Ultra Filtration ◽  
Water And Wastewater ◽  
Filter Cakes

The fractal structure and particle size of flocs are generally recognized as the two most crucial physical properties having impact on the efficiency of operation of several unit processes in water and wastewater treatment. In this study, an experimental investigation is undertaken on the effect of aggregate structure in water and wastewater treatment in Hong Kong. The fractal dimension of the resulting aggregate is employed as a measure of the aggregate structure. Small angle light scattering technique is used here. Different amounts of polymers are mixed to bacterial suspensions and the resulting structures are examined. The addition of polymer may foster aggregate formation by neutralization of the bacterial surface charge and enhance inter-particle bridging. The aggregation behavior may affect the efficiency of certain water and wastewater treatment processes such as dewatering and coagulation. The impacts of aggregate structure on two representative processes, namely, ultra-filtration membrane fouling and pressure filter dewatering efficiency, are studied. It is found that the looser flocs yield a more porous cake and less tendency to foul whilst more porous filter cakes yield more ready biosolids dewatering.

UV-254 transformation of antibiotics in water and wastewater treatment processes

2020 ◽  
pp. 239-297 ◽  
Author(s):  
Mamatha Hopanna ◽  
Kiranmayi Mangalgiri ◽  
Temitope Ibitoye ◽  
Daniel Ocasio ◽  
Sebastian Snowberger ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Water And Wastewater Treatment ◽  
Treatment Processes ◽  
Water And Wastewater

Graphene, electrospun membranes and granular activated carbon for eliminating heavy metals, pesticides and bacteria in water and wastewater treatment processes

The Analyst ◽  
2018 ◽  
Vol 143 (23) ◽  
pp. 5629-5645 ◽  
Author(s):  
Piumie Rajapaksha P. ◽  
Aoife Power ◽  
Shaneel Chandra ◽  
James Chapman
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Activated Carbon ◽  
Granular Activated Carbon ◽  
Water And Wastewater Treatment ◽  
Safe Water ◽  
Treatment Processes ◽  
Electrospun Membranes ◽  
Water And Wastewater

The availability of safe water has a significant impact on all parts of society, its growth and sustainability, both politically and socioeconomically.

Fundamentals of Membranes and Membrane Processes

2020 ◽  
pp. 1-24
Keyword(s):  
Wastewater Treatment ◽  
Structural Characteristics ◽  
Critical Parameters ◽  
Intrinsic Properties ◽  
Water And Wastewater Treatment ◽  
Membrane Processes ◽  
Treatment Processes ◽  
Overall Performance ◽  
Water And Wastewater ◽  
Membrane Science

Research into the wide possibilities of membrane-based applications is an interesting subject for the modern study of membrane science and technology. Membrane processes have been established as viable and recognized separation techniques in water and wastewater treatment processes. Membranes can be prepared into many forms, each with its intrinsic properties which ultimately determine its suitability for specific applications as well as the overall performance of the process. Thus, this chapter highlights the fundamental concepts of membranes and membrane processes. The critical parameters in membrane processes, and membranes' structural characteristics and parameters are reviewed.

scholarly journals The Evolution of Photocatalytic Membrane Reactors over the Last 20 Years: A State of the Art Perspective

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 775
Author(s):  
Raffaele Molinari ◽  
Cristina Lavorato ◽  
Pietro Argurio
Keyword(s):  
Wastewater Treatment ◽  
Membrane Fouling ◽  
Polymeric Membranes ◽  
Membrane Reactors ◽  
Water And Wastewater Treatment ◽  
Know How ◽  
Degradation Reactions ◽  
Water And Wastewater ◽  
Year 2000 ◽  
Synthesis Reactions

The research on photocatalytic membrane reactors (PMRs) started around the year 2000 with the study of wastewater treatment by degradation reactions of recalcitrant organic pollutants, and since then the evolution of our scientific knowledge has increased significantly, broadening interest in reactions such as the synthesis of organic chemicals. In this paper, we focus on some initial problems and how they have been solved/reduced over time to improve the performance of processes in PMRs. Some know-how gained during these last two decades of research concerns decreasing/avoiding the degradation of the polymeric membranes, improving photocatalyst reuse, decreasing membrane fouling, enhancing visible light photocatalysts, and improving selectivity towards the reaction product(s) in synthesis reactions (partial oxidation and reduction). All these aspects are discussed in detail in this review. This technology seems quite mature in the case of water and wastewater treatment using submerged photocatalytic membrane reactors (SPMRs), while for applications concerning synthesis reactions, additional knowledge is required.

scholarly journals ASPECTS REGARDING THE ELECTROCOAGULATION APPLICATIONS IN THE WATER AND WASTEWATER TREATMENT

2016 ◽  
Vol 21 (2) ◽  
Author(s):  
AIDA DERMOUCHI ◽  
BENCHEIKH-LEHOCINE MOSSAAB ◽  
SIHEM ARRIS ◽  
VALENTIN NEDEFF ◽  
NARCIS BARSAN
Keyword(s):  
Wastewater Treatment ◽  
Electrode Materials ◽  
Treatment Time ◽  
Oxygen Demand ◽  
Water And Wastewater Treatment ◽  
Treatment Processes ◽  
Initial Ph ◽  
Water And Wastewater ◽  
Dc Current ◽  
Density Treatment

Electrocoagulation (EC) has been known for over a century. Applications in industry as water and wastewater treatment processes were adapted for the removal of suspended solids, organic compounds, COD (Chemical oxygen demand), BOD (biochemical oxygen demand), metallic and non-metallic pollution. The main advantage in EC technology is the fact that it works without the addition of chemical products. The DC current between metallic electrodes immersed in the effluent is used as an energy source for this technique, which causes their dissolution. The effect of the main parameters, current density, treatment time, initial pH, temperature, electrode materials, conductivity and distance between the electrodes were investigated. According to the conclusion of the works published in recent years, the removal efficiencies of pollutants materials by EC process are very important.

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