Enhanced coagulation for algae removal through the control of zeta potential with diatomite

2011 ◽  
Vol 11 (2) ◽  
pp. 159-165
Author(s):  
C. D. Wu ◽  
X. J. Xu ◽  
Q. Wang
Keyword(s):  
Surface Water ◽  
Zeta Potential ◽  
Organic Material ◽  
Advanced Technology ◽  
Advanced Treatment ◽  
Efficient Treatment ◽  
Enhanced Coagulation ◽  
Algae Removal ◽  
Study Results ◽  
Polyaluminium Chloride

Advanced technology for more efficient treatment of algae-containing water is always needed. The feasibility of using diatomite for advanced treatment of algae-containing surface water and controlling algae removal process through zeta potential was investigated in this study. Results demonstrated that the addition of diatomite is advantageous due to reduction of the polyaluminium chloride (PAC) dose required for satisfactory treatment of Microcystis aeruginosa (MA) and zeta potential which can well reflect the MA removal efficiency. The zeta potential at optimum removal was measured and it was observed that when the zeta potential was reduced to the range of −14.4 mV and +3.53 mV, removal of MA and associated organic material was optimized. Process control using zeta potential is therefore a viable tool for algae removal by enhanced coagulation combining PAC with diatomite.

ENHANCED COAGULATION FOR ALGAE REMOVAL IN A TYPICAL ALGERIA WATER TREATMENT PLANT

2017 ◽  
Vol 16 (10) ◽  
pp. 2303-2315 ◽  
Author(s):  
Djamel Ghernaout ◽  
Abdelmalek Badis ◽  
Ghania Braikia ◽  
Nadjet Mataam ◽  
Moussa Fekhar ◽  
...  
Keyword(s):  
Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Enhanced Coagulation ◽  
Algae Removal

scholarly journals Antioxidant-Loaded Mucoadhesive Nanoparticles for Eye Drug Delivery: A New Strategy to Reduce Oxidative Stress

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 379
Author(s):  
Sandra Cordeiro ◽  
Beatriz Silva ◽  
Ana Margarida Martins ◽  
Helena Margarida Ribeiro ◽  
Lídia Gonçalves ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Hyaluronic Acid ◽  
Zeta Potential ◽  
Retinal Pigment ◽  
Release Kinetic ◽  
Efficient Treatment ◽  
Non Invasive ◽  
Diffusion Cells ◽  
Franz Diffusion Cells

There are several approaches to treat ocular diseases, which can be invasive or non-invasive. Within the non-invasive, new pharmaceutical strategies based on nanotechnology and mucoadhesive polymers are emerging methodologies, which aim to reach an efficient treatment of eye diseases. The aim of this work was the development of novel chitosan/hyaluronic acid nanoparticle systems with mucoadhesive properties, intended to encapsulate antioxidant molecules (e.g., crocin) aiming to reduce eye oxidative stress and, consequently, ocular disease. An ultraviolet (UV) absorber molecule, actinoquinol, was also added to the nanoparticles, to further decrease oxidative stress. The developed nanoparticles were characterized and the results showed a mean particle size lower than 400 nm, polydispersity index of 0.220 ± 0.034, positive zeta potential, and high yield. The nanoparticles were also characterized in terms of pH, osmolality, and viscosity. Mucoadhesion studies involving the determination of zeta potential, viscosity, and tackiness, showed a strong interaction between the nanoparticles and mucin. In vitro release studies using synthetic membranes in Franz diffusion cells were conducted to unravel the drug release kinetic profile. Ex vitro studies using pig eye scleras in Franz diffusion cells were performed to evaluate the permeation of the nanoparticles. Furthermore, in vitro assays using the ARPE-19 (adult retinal pigment epithelium) cell line showed that the nanoparticles can efficiently decrease oxidative stress and showed low cytotoxicity. Thus, the developed chitosan/hyaluronic acid nanoparticles are a promising system for the delivery of antioxidants to the eye, by increasing their residence time and controlling their delivery.

Effect of arsenate on adsorption of Zn(II) by three variable charge soils

Soil Research ◽  
2007 ◽  
Vol 45 (6) ◽  
pp. 465 ◽  
Author(s):  
Jing Liang ◽  
Ren-kou Xu ◽  
Diwakar Tiwari ◽  
An-zhen Zhao
Keyword(s):  
Zeta Potential ◽  
Surface Charge ◽  
Iron Oxides ◽  
Initial Concentration ◽  
Variable Charge ◽  
Study Results ◽  
Negative Surface ◽  
Negative Surface Charge ◽  
Enhanced Adsorption ◽  
Variable Charge Soils

The effect of arsenate on adsorption of Zn(II) in 3 variable charge soils (Hyper-Rhodic Ferralsol, Rhodic Ferralsol, and Haplic Acrisol) and the desorption of pre-adsorbed Zn(II) in the presence of arsenate were investigated in this study. Results showed that the presence of arsenate led to an increase in both the adsorption and desorption of Zn(II) in these variable charge soils. It was also suggested that the enhanced Zn(II) adsorption by arsenate was mainly due to the increase in negative surface charge of the soils induced by the specific adsorption of arsenate, and the increase in electrostatically adsorbed Zn(II) was responsible for the increase in the desorption of Zn(II). The effect of arsenate on Zn(II) adsorption primarily depends on the initial concentration of arsenate and Zn(II), the system pH, and the nature of soils. The enhanced adsorption of Zn(II) increased with the increase in the initial concentration of arsenate and the amount of arsenate adsorbed by the soils. The presence of arsenate decreased the zeta potential of soil suspensions and soil IEP and thus shifted the adsorption edge of Zn(II) to a lower pH region. The effect of arsenate on Zn(II) adsorption in these 3 soils followed the order Hyper-Rhodic Ferralsol > Rhodic Ferralsol > Haplic Acrisol, which was consistent to the contents of iron oxides in these soils and the amount of arsenate adsorbed by the soils.

scholarly journals Targeted Delivery of Amantadine-loaded Methacrylate Nanosphere-ligands for the Potential Treatment of Amyotrophic Lateral Sclerosis

2018 ◽  
Vol 21 ◽  
pp. 94-109 ◽  
Author(s):  
Zamanzima Mazibuko ◽  
Sunaina Indermun ◽  
Mershen Govender ◽  
Pradeep Kumar ◽  
Lisa C Du Toit ◽  
...  
Keyword(s):  
Amyotrophic Lateral Sclerosis ◽  
Zeta Potential ◽  
Targeted Delivery ◽  
Ex Vivo ◽  
Release Kinetics ◽  
Burst Release ◽  
Prolonged Release ◽  
Chelating Ligand ◽  
Study Results ◽  
Lateral Sclerosis

Purpose. This study aimed to develop and analyse poly(DL-lactic acid)-methacrylic acid nanospheres bound to the chelating ligand diethylenetriaminepentaacetic acid (DTPA)  for the targeted delivery of amantadine in Amyotrophic Lateral Sclerosis (ALS). Methods. The nanospheres were prepared by a double emulsion solvent evaporation technique statistically optimized employing a 3-Factor Box-Behnken experimental design. Analysis of the particle size, zeta potential, polydispersity (Pdl), morphology, drug entrapment and drug release kinetics were carried out. Results. The prepared nanospheres were determined to have particle sizes ranging from 68.31 to 113.6 nm (Pdl ≤ 0.5). An initial burst release (50% of amantadine released in 24 hr) was also obtained, followed by a prolonged release phase of amantadine over 72 hr. Successful conjugation of the chelating ligand onto the surface of the optimised nanospheres was thereafter achieved and confirmed by TEM. The synthesized modified nanospheres were spherical in shape, 105.6 nm in size, with a PdI of 0.24 and zeta potential of -28.0 mV. Conjugation efficiency was determined to be 74%. In vitro and ex vivo cell study results confirmed the intracellular uptake of the modified nanospheres by the NSC-34 cell line and the non-cytotoxicity of the synthesized nanospheres. Conclusions. Biocompatible amantadine-loaded nanospheres were successfully designed, characterized and optimized employing the randomized Box-Behnken statistical design. Delivery of amantadine over 72 hrs was achieved, with the nanospheres being of a size capable of internalization by the NSC- 34 cells. This article is open to POST-PUBLICATION REVIEW. Registered readers (see “For Readers”) may comment by clicking on ABSTRACT on the issue’s contents page.

scholarly journals Pharmacist’s role in the system of palliative and hospice care in Ukraine and Poland

2014 ◽  
Vol 83 (4) ◽  
pp. 282-287
Author(s):  
Sofiya Prokip ◽  
Iga Pawłowska ◽  
Bohdan Hromovyk ◽  
Leszek Pawłowski
Keyword(s):  
Multidisciplinary Team ◽  
Multidisciplinary Approach ◽  
Hospice Care ◽  
Multiple Choice Questions ◽  
Drug Management ◽  
Efficient Treatment ◽  
Study Results ◽  
Polish Study ◽  
The Status

Introduction. The efficient pharmacotherapy is an important part of palliative and hospice care, and requires a multidisciplinary approach to the patients. The pharmacist, as the member of the multidisciplinary therapeutic team, is responsible for performing pharmaceutical care, which provides safe and efficient treatment. The aim of the research was to conduct a comparative research about the status of palliative and hospice care and role of the pharmacist (clinical pharmacist) in Ukraine and Poland.Material and methods. It was a questionnaire survey conducted in Ukraine, as well as analysis of information sources associated with this subject. The questionnaire was developed on the basis of similar study conducted in Poland. It consisted of 15 multiple-choice questions addressed to head physicians and doctors in Ukraine. The obtained results were compared to the results of the mentioned above Polish study. Results. Eight head physicians and 22 doctors (30 questionnaires) from 13 palliative and hospice care institutions in Ukraine responded to the survey. It has been found that almost half in Ukraine (43%) believed that the pharmacist should be a mandatory member of a multidisciplinary team, because of his/her significant role in drug management in hospice. Conclusion. A multidisciplinary approach to satisfying of patients' needs in palliative and hospice care has a great significance. Results of the study testify to the importance of including the pharmacists into the multidisciplinary team.

scholarly journals Agricultural aspects in river basin management plans

2012 ◽  
pp. 149-152
Author(s):  
János Fehér
Keyword(s):  
Surface Water ◽  
River Basin ◽  
Organic Material ◽  
River Basin Management ◽  
Water Bodies ◽  
Basin Management ◽  
River Basin Management Plans ◽  
Management Plans ◽  
Surface Water Bodies ◽  
The Impact

In the European Region agriculture is the second largest water user after power industry cooling water use. As part of the implementation of Water Framework Directive EU Member States prepared their river basin management plans by the end of 2009 or first half of 2010, In these plans impacts of agriculture on water bodies have received attention. The detailed information elaborated in the plans by countries and river basin districts were uploaded into the WFD section of the WISE system. This database provides opportunity for multi-criteria analysis for different water types. The paper discusses the effects of agriculture on hydromorphological pressures and impacts affecting surface water bodies. It was pointed out that among the pressures affecting European surface water bodies the hydromorphological and diffuse pressures represent the highest ratios (Figure 1). Within the hydromorphological pressures affecting classified surface water bodies the ratio of pressures related to agricultural activities is low,it does not exceed 1% at European level. In case of Hungary the agriculture related river management pressures effect about 80% of the surface water bodies, which is much higher than the corresponding European average. The agricultural water abstractions affect about 10% of the Hungarian surface water bodies (Figures 2 and 3). The river and lake water bodies are impacted in significant ratio by nutrient enrichments and organic material enrichments, while in case of river water bodies the impact of organic material enrichments is also significant (Figures 4 and 5).

Organic THMs precursors removal from surface water with low TOC and high alkalinity by enhanced coagulation

2004 ◽  
Vol 4 (5-6) ◽  
pp. 103-111 ◽  
Author(s):  
L. Rizzo ◽  
V. Belgiorno ◽  
S. Meriç
Keyword(s):  
Surface Water ◽  
Drinking Water Treatment ◽  
Residual Chlorine ◽  
Enhanced Coagulation ◽  
Toc Removal ◽  
Jar Test ◽  
High Alkalinity ◽  
Surface Water Resource ◽  
Free Residual Chlorine ◽  
Residual Al

NOM removal from surface waters is needed because of potentially carcinogen compound (trihalomethane, THM) formation due to reaction between NOM and free residual chlorine used for disinfection. The stringent limits for THMs (e.g., 30 μg/l in Italy) force conventional drinking water treatment plants to increase TOC removal efficiency by enhanced coagulation. This study was performed on 17 samples taken from a surface water resource with low TOC content (<3 mg/l) and high alkalinity (190 mg as CaCO3/l) to remove TOC and other parameters (DOC, UV254, SUVA, turbidity), typically used to characterize NOM content. Four different coagulants (Al2(SO4)3·18H2O, FeCl3·6H2O, FeSO4·7H2O and PACl) were used in jar test without adding polymer as flocculant. There was no correlation between DOC and SUVA in raw and treated water. TOC removal efficiencies (15–30%) required by the USEPA D/DBPs rule were obtained using 30–50 mg/l alum, 30–50 mg/l of FeCl3, and less than 20 mg/l of PACl (as Al2O3, 10%). The use of PACl is suggested for both lesser TTHMFP and residual Al levels (<100 μg/l) occurrences without any pH adjustment.

Occurrence and Treatment of Pharmaceuticals and Personal Care Products in Surface Water around the Global Region

2014 ◽  
Vol 507 ◽  
pp. 720-724
Author(s):  
Wan Qian Guo ◽  
Hai Ou Cao ◽  
Xian Jiao Zhou ◽  
Ren Li Yin
Keyword(s):  
Surface Water ◽  
Human Health ◽  
Personal Care Products ◽  
Personal Care ◽  
Research Groups ◽  
Efficient Treatment ◽  
Treatment Methods ◽  
The World ◽  
Emerging Issues

The occurrence of pharmaceuticals and personal care products (PPCPs) in surface water, and their potential impacts on human health are emerging issues all over the world. This paper summarizes the data from worldwide research groups, aiming to illustrate the occurrence of PPCPS, and their potential threatens to human health. Furthermore, the current efficient treatment methods for the PPCPS were discussed as well.

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