scholarly journals DEVELOPMENT OF ACID MODIFIED CELLULOSE ACETATE MEMBRANES FOR SALT WATER TREATMENT

2021 ◽  
Vol 55 (9-10) ◽  
pp. 1153-1161
Author(s):  
HANANE ABURIDEH ◽  
◽  
ZAHIA TIGRINE ◽  
LAMINE AOUDJIT ◽  
ZOUBIR BELGROUN ◽  
...  

The main objective of this work has been to study the performance of membranes developed for water treatment. Polymeric membranes (CTP and CTP-Acid) were developed from solutions containing cellulose acetate (CA), cellulose triacetate (CTA) and polysulfone (PSF), using maleic acid (MA) and acetic acid (AA) as additives and chloroform/dioxane as solvent. The NIPS-type phase inversion method was chosen as the membrane film manufacturing technique. The incorporation of 2.5% and 5% by weight of acids in the membrane mixture allowed us to study the additive effect on the morphological structure, and to predict the performance of the membranes formed. The characterization of the membranes was performed by SEM and FTIR analyses. Examining the flux, permeability and selectivity of the membranes also permitted to study the efficiency and performance of each membrane. The addition of AA and MA additives within the mixture increased the hydrophilic character and improved the flux rate by increasing it from 75 Lm-2h-1 to 142.74 Lm-2h-1 for 5% maleic acid addition. The 5% CTP AA membrane gave very satisfactory results in terms of selectivity, with a maximum removal of 84% of NaCl salt. Therefore, this membrane has been considered to be the most efficient one, with a flux of 120 Lm-2h-1 to 15 bar and a NaCl salt retention that meets the standards required by the World Health Organization (WHO).

2018 ◽  
Vol 1 (1) ◽  
pp. 6
Author(s):  
Malikhatul Hidayah

<p><em>Industrial waste water area that flows in the River Flood Canal Semarang can affect the environment if not done processing. Membrane is one alternative water treatment technologies with the principle of filtration. The presence of fouling is a problem encountered in the use of the membrane. In this study will be made of non-fouling nanofiltration membranes made from cellulose acetate. Manufacture of cellulose acetate membrane is accomplished by phase inversion method, which is changing the shape of the polymer solid phase into the liquid phase rich in solvent into solids (membrane) which is rich in polymer. Therefore, the aim of this study was to create a non-fouling nanofiltration membrane using cellulose acetate polymer as well as assess the effect of PEG additives and pre-treatment with UV light to the surface of the structure and performance of cellulose acetate membranes for produced water treatment. Research using cellulose acetate membranes for wastewater treatment is done by varying the type of PEG 1500 and 4000, variations of PEG of 1, 3 and 5% by weight and a UV irradiation for 10, 20 and 30 seconds. The research followed by testing the performance of the membrane in wastewater treatment using a dead-end filtration with the parameters of flux and rejection. Characterization of the membrane was analyzed with SEM and FTIR. Analysis of the results was conducted to determine the levels of turbidity, TDS, COD, Ca<sup>2+</sup>, S<sup>2-</sup> and oil in waste water before and after passing through the membrane.</em><em></em></p>


2006 ◽  
Vol 21 (5) ◽  
pp. 310-315 ◽  
Author(s):  
Nobhojit Roy

AbstractIntroduction:On 26 December 2004, an earthquake (9.0 Richter, 10 kilometers below the sea) near Sumatra, Indonesia, triggered a tsunami, which traveled at approximately 800 km per hour to strike the Indian coastline. The disaster response at a 100-bed hospital situated on the beach front (2,028 km from the epi-center) is described.This paper underlines the benefit of the Pan-American Health Organization (PAHO)/World Health Organization (WHO) Guidelines for Natural Disasters in the Indian setting.Methods:The demand on the healthcare system in the affected study area (50 km2, 40,000 population) was assessed in terms of preparedness, response time, casualties, personnel, and resources. Other disaster issues studied included: (1) the disposal of the dead; (2) sanitation; (3) water supply; (4) food; (5) the role of the media; and (6) rehabilitation. Two hospital paramedics administered a disaster-related questionnaire in the local language to the victims (or an accompanying person) upon arrival at the hospital. Personalinterviews with administrative officials involved in incident management, aid, volunteers, and response, also were conducted.The outreach programs consisted of medical camps, health education, re-chlorination of contaminated drinking water, and spraying bleaching powder on wet floor areas.Results:The total death toll in the area was 62 (with 56, four, and two bodies being recovered on Day 1, 2, and 3 respectively). There were 17 deceased males and 45 females. The bodies immediately were handed over to the relatives upon identification or sent to the mortuary. The attendance in the makeshift accident-and-emergency department on the day of the Tsunami was 219, surged to 339 patients on Day 2, and returned to baseline census on Day 7. Essentially, injuries were minor, and two children with pulmonary edema secondary to salt-water drowning recovered fully. The hospital was cleaned of debris and seaweed on Day 3 and the equipment was restored, but it remained only partially functional. This is because many staff members did not come to work because of rumors that another tsunami was imminent.There were no outbreaks of water-borne illnesses. Post-traumatic stress disorder (PTSD) symptoms such as panic attacks, nightmares, insomnia, fear of water, being startled by loud sounds, and palpitations were detected in 17% of the patients.Conclusions:After an event, medical rescue personnel often are instructed by well-meaning authorities to conduct interventions and response, which have high visibility in the media. However, strictly adhering to the Pan-American Health Organization/World Health Organization guidelines proved to be cost-effective in terms of resource allocations and disaster responses in the Tsunami-affected areas. Unnecessary mass vaccinations, mass disposal of dead bodies without identification, and an influx of untrained volunteers were avoided. Inappropriate aid by developed nations often is unmindful of the victims'needs and self-esteem. The survivors demonstrated natural coping mechanisms and resilience, which only required time and psychosocial support.


2015 ◽  
Vol 10 (2) ◽  
pp. 361-370 ◽  
Author(s):  
K. Matthies ◽  
H. Bitter ◽  
N. Deobald ◽  
M. Heinle ◽  
R. Diedel ◽  
...  

People in rural developing areas often depend on point-of-use water treatment for safe drinking water. A very popular and efficient technology for this is the use of ceramic filters, as promoted by the non-governmental organization Potters for Peace. These filters are already used in many countries worldwide, including Indonesia, where they are manufactured in Bandung, Java by Pelita Indonesia. The filters are made of local clay and combustible material, and coated with silver after firing. However, data available on them are very scarce. The structure, composition, and physico-chemical and microbiological performance of the filter were examined. Pore sizes mostly ranged from 1 to 40 µm and flow rate was about 1.3 L/h. Silver, arsenic and manganese were leaching from the filter in remarkable concentrations. While values for silver were about 0.01–0.02 mg/L, manganese was washed out after a few liters and leaching of arsenic fell below 0.02 mg/L after filtering some liters. With a log reduction of 3–5, efficiency in bacteria reduction was satisfactory in contrast to virus removal which was not sufficient according to the World Health Organization guidelines, with a log reduction below 1.


1994 ◽  
Vol 29 (4) ◽  
pp. 571-580
Author(s):  
Jose M. Azcue ◽  
Olaf Malam ◽  
Wolfgang G. Pfeiffer

Abstract The effect of the extended use of alum on the concentration of aluminum in water treatment was investigated. Water from the Paraiba do Sul-Guandu River (PSR-GR) system, collected after conventional treatment, was analyzed from the six water treatment plants (WTPs). One of the WTPs, the Guandu WTP, supplies water to the city of Rio de Janeiro (11 million inhabitants) with a flow of 40 m3/s. The concentrations of aluminum found were near and sometimes over the values recommended by the World Health Organization (200 µg/L), with an average concentration of 306 µg/L, reaching seasonally maximum values of 877 µg/L at the WTP and 2,100 µg/L in household taps. The discharge of alum sludge back to the river system is the predominant pathway in the aluminum cycling in the study area, followed by sedimentation and enhanced availability to the biota.


2010 ◽  
Vol 61 (5) ◽  
pp. 1307-1315 ◽  
Author(s):  
H.-J. Mälzer ◽  
N. Staben ◽  
A. Hein ◽  
W. Merkel

According to the recommendations of the World Health Organization (WHO) for Water Safety Plans (WSP), a Technical Risk Management was developed, which considers standard demands in drinking water treatment in Germany. It was already implemented at several drinking water treatment plants of different size and treatment processes in Germany. Hazards affecting water quality, continuity, and the reliability of supply from catchment to treatment and distribution could be identified by a systematic approach, and suitable control measures were defined. Experiences are presented by detailed examples covering methods, practical consequences, and further outcomes. The method and the benefits for the water suppliers are discussed and an outlook on the future role of WSPs in German water supply is given.


2021 ◽  
Vol 13 (19) ◽  
pp. 10570
Author(s):  
Abdassalam A. Azamzam ◽  
Mohd Rafatullah ◽  
Esam Bashir Yahya ◽  
Mardiana Idayu Ahmad ◽  
Japareng Lalung ◽  
...  

Poor access to drinking water, sanitation, and hygiene has always been a major concern and a main challenge facing humanity even in the current century. A third of the global population lacks access to microbiologically safe drinking water, especially in rural and poor areas that lack proper treatment facilities. Solar water disinfection (SODIS) is widely proven by the World Health Organization as an accepted method for inactivating waterborne pathogens. A significant number of studies have recently been conducted regarding its effectiveness and how to overcome its limitations, by using water pretreatment steps either by physical, chemical, and biological factors or the integration of photocatalysis in SODIS processes. This review covers the role of solar disinfection in water treatment applications, going through different water treatment approaches including physical, chemical, and biological, and discusses the inactivation mechanisms of water pathogens including bacteria, viruses, and even protozoa and fungi. The review also addresses the latest advances in different pre-treatment modifications to enhance the treatment performance of the SODIS process in addition to the main limitations and challenges.


Water ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1567 ◽  
Author(s):  
Félix Légaré-Julien ◽  
Olivier Lemay ◽  
Ulysse Vallée-Godbout ◽  
Christian Bouchard ◽  
Caetano Dorea

Coagulant/disinfection products (CDPs) are a point-of-use (POU) water treatment technique that can improve microbial quality, reduce turbidity, and produce a free chlorine residual (FCR), serving as a potentially effective option for decentralized water treatment in a variety of contexts, including humanitarian emergencies. A novel CDP with a sodium dichloroisocyanurate-based disinfectant was evaluated with regard to its laboratory water treatment efficacy and generation of disinfection byproducts (DBPs). The CDP water treatment performance was assessed relative to bacteriological (E. coli) humanitarian water quality objectives, World Health Organization recommendations for evaluating POU water treatment options, and available DBP regulations and guidelines. At least 4 log10 E. coli reductions, for a “highly protective” status with regard to bacterial reductions, were attained in the tested conditions. Treated waters were consistently below 10 MPN/100 mL with regard to E. coli concentrations, with the majority of samples showing no detectable E. coli. For most conditions, target FCR values were not attained. Treated water turbidity levels were mostly between 5 NTU and 10 NTU. DBP levels were below the regulatory and health-based targets for both families of DBPs studied. This study has served to identify the performance envelopes of the CDP tested under challenging conditions.


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