Hybrid water disinfection system with silver ion in continuous flow ultrasonic reactor

2021 ◽  
Vol 213 ◽  
pp. 64-74
Author(s):  
Fadime Karaer Özmen ◽  
Ali Savaş Koparal
Keyword(s):  
Continuous Flow ◽  
Water Disinfection ◽  
Silver Ion

scholarly journals Design of a cost-effective electrochlorination system for point-of-use water treatment

2020 ◽  
Vol 26 (5) ◽  
pp. 200437-0
Author(s):  
Mainak Bhattacharya ◽  
Koyel Bandyopadhyay ◽  
Anirban Gupta
Keyword(s):  
Water Treatment ◽  
Continuous Flow ◽  
Low Cost ◽  
Developed Countries ◽  
Water Disinfection ◽  
Residual Chlorine ◽  
Waterborne Diseases ◽  
Bacterial Inactivation ◽  
Treatment Unit ◽  
Continuous Flow Reactors

Bacteriological contamination in drinking water is known to be responsible for the spread of various waterborne diseases. Although chlorine is frequently used as disinfectant in water treatment, low-cost disinfecting technologies in the villages of developing and under-developed countries are not yet successfully implemented. This study contributed in designing a simple and inexpensive water disinfection unit to produce chlorine from the naturally available dissolved chloride of groundwater by electrochlorination, using inert and cheap graphite electrodes. Laboratory-based experiments were performed in both batch and continuous flow reactors to study the effect of time, current, electro charge loading (ECL), and surface area of electrodes in chlorine generation and bacterial inactivation. Controlled experiments in continuous mode in the absence of chlorine further indicated the possibility of partial inactivation of bacteria under the influence of the electric field. Finally, a treatment unit with drilled anodes, and undrilled cathode electrodes, in continuous flow set-up was installed in four schools of four different villages in West Bengal, India. An average residual chlorine concentration and removal efficiency of total coliform in the designed systems were determined as 0.3 ± 0.07 mg/L, and 98.4% ± 1.6%, respectively.

scholarly journals A new continuous-flow solar water disinfection system inactivating cysts of Acanthamoeba castellanii, and bacteria

2021 ◽  
Vol 20 (1) ◽  
pp. 123-137
Author(s):  
Beni Jequicene Mussengue Chaúque ◽  
Antônio Domingues Benetti ◽  
Gertrudes Corção ◽  
Carlos Eugênio Silva ◽  
Rodrigo Fernandes Gonçalves ◽  
...  
Keyword(s):  
Continuous Flow ◽  
Acanthamoeba Castellanii ◽  
Water Disinfection ◽  
Solar Water ◽  
Solar Water Disinfection

Photocatalytic water disinfection of Cryptosporidium parvum and Giardia lamblia using a fibrous ceramic TiO2 photocatalyst

2009 ◽  
Vol 59 (4) ◽  
pp. 639-645 ◽  
Author(s):  
Sergio Navalon ◽  
Mercedes Alvaro ◽  
Hermenegildo Garcia ◽  
Daniel Escrig ◽  
Víctor Costa
Keyword(s):  
Adverse Effects ◽  
Cryptosporidium Parvum ◽  
Giardia Lamblia ◽  
Continuous Flow ◽  
Uv Light ◽  
Small Concentration ◽  
Water Disinfection ◽  
Photocatalytic Process ◽  
Tio2 Photocatalyst ◽  
Low Concentrations

Cryptosporidium parvum and Giardia lamblia are two of the most chlorine resistant microorganisms with notable adverse effects on humans. Our study shows that waters containing these two protozoa at low concentrations can be efficiently disinfected in continuous flow by using a commercial fibrous ceramic TiO2 photocatalyst. The efficiency of the photocatalytic disinfection is largely enhanced by adding a small concentration of chlorine. In this way, the residence time on the photoreactor can be considerably shortened. In contrast, under the same conditions and radiance power, UV light without any photocatalyst is significantly less efficient, particularly for G. lamblia. These results exemplify the advantages of the photocatalytic process for safe and complete water disinfection.

scholarly journals Influence of Acoustic Oscillations on Continuous-Flow Water Disinfection

Processes ◽  
2020 ◽  
Vol 8 (10) ◽  
pp. 1259
Author(s):  
Anna V. Abramova ◽  
Vadim M. Bayazitov ◽  
Igor S. Fedulov ◽  
Roman V. Nikonov ◽  
Vladimir G. Sister ◽  
...  
Keyword(s):  
Continuous Flow ◽  
Vortex Flow ◽  
Synergistic Effects ◽  
Acoustic Power ◽  
Excess Pressure ◽  
Water Disinfection ◽  
Hybrid Reactor ◽  
Acoustic Oscillations ◽  
Physical Treatment ◽  
Microorganism Inactivation

Water disinfection and potential sterilization in continuous flow was achieved in a hybrid reactor with a broadband hydrodynamic emitter combined with ultrasonic vibrations at different frequencies and with excess pressure. Such a combination showed synergistic effects by increasing the acoustic power in the reactor vortex flow. The present combined physical treatment, compared with sonication alone, could increase microorganism inactivation by 15–20%.

scholarly journals CFD Modeling of Fixed Photocatalytic Inserts for a Continuous Flow Reactor for Water Disinfection

2012 ◽  
Vol 15 (1) ◽  
Author(s):  
David Misstear ◽  
Laurence Gill
Keyword(s):  
Continuous Flow ◽  
Flow Reactor ◽  
Water Disinfection ◽  
Cfd Modeling ◽  
Surface Phenomenon ◽  
Good Representation ◽  
Solar Disinfection ◽  
Continuous Flow Reactor ◽  
Computational Fluid Dynamics Cfd ◽  
Number Of Particles

AbstractThe design of a suitable fixed photocatalytic support for water disinfection in a continuous flow reactor was researched. Computational fluid dynamics (CFD) was used to simulate the percentage of tracked particles coming into contact with the irradiated surface of different support geometries, cylindrical: conical and consecutive frusta and a spring. The number of particles striking each insert was presumed to give a good representation of the respective disinfection efficiencies of each design, as photocatalysis is effectively a surface phenomenon. It was found that a conical frustum design was more than three times as efficient as a similarly-sized conventional cylindrical insert with regard to this parameter, and arrangements of shorter frusta exhibited even more promising traits. A further regime of laboratory testing is proposed in order to determine the practical efficiency of the insert designs, which may have important applications in the solar disinfection of drinking water.

Catalyst- and oxidant-free electrochemical para-selective hydroxylation of N-arylamides in batch and continuous-flow

2020 ◽  
Vol 22 (19) ◽  
pp. 6437-6443
Author(s):  
Cheng-Kou Liu ◽  
Meng-Yi Chen ◽  
Xin-Xin Lin ◽  
Zheng Fang ◽  
Kai Guo
Keyword(s):  
Ammonium Salt ◽  
Quaternary Ammonium ◽  
Continuous Flow ◽  
Quaternary Ammonium Salt ◽  
Selective Hydroxylation

A catalyst-, oxidant-, acidic solvent- and quaternary ammonium salt-free electrochemical para-selective hydroxylation of N-arylamides at rt in batch and continuous-flow was developed.

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