Adsorption isotherm studies of the simultaneous removal of turbidity and hardness by natural coagulants

2013 ◽  
Vol 8 (3-4) ◽  
pp. 495-502 ◽  
Author(s):  
C. Nirmala Rani ◽  
Rajashekar Talikoti
Keyword(s):  
Rural Areas ◽  
Hard Water ◽  
Cost Effective ◽  
Simultaneous Removal ◽  
Turbidity Removal ◽  
Jar Test ◽  
Test Study ◽  
Natural Coagulants ◽  
Strychnos Potatorum ◽  
Hardness Removal

Coagulation being a cost-effective method is best suited for water treatment in rural areas. Natural coagulants suited for the simultaneous removal of turbidity and hardness were investigated. In this study, the seeds of Strychnos Potatorum, the pads of Cactus Opuntia and mucilage extracted from the fruits of Coccinia Indica in synthetic turbid water were used to promote coagulation. The mechanism of turbidity removal by the use of natural coagulants was based on adsorption and charge neutralization. In addition, the adsorption mechanism of hardness removal in hard water conforms to both Langmuir and Freundlich adsorption models. Therefore, for hard water the natural coagulants tend to adsorb hardness and form a net like structure followed by turbidity removal by sweep flocculation. The potential of these natural coagulants were obtained by means of jar test study with initial turbidities of 192 NTU (High) and 28 NTU (Low). It was found that the natural coagulants can be more efficiently used for high turbid waters. Hardness removal efficiency was found to increase with the increase in coagulant dosage.

scholarly journals Competence of blended coagulants for surface water treatment

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Vara Saritha ◽  
Manoj Kumar Karnena ◽  
Bhavya Kavitha Dwarapureddi
Keyword(s):  
Surface Water ◽  
Physicochemical Parameters ◽  
Test Apparatus ◽  
Turbidity Removal ◽  
Floc Size ◽  
Surface Water Treatment ◽  
Jar Test ◽  
Coagulation And Flocculation ◽  
Natural Coagulants ◽  
Surface Water Samples

AbstractOwing to the advantages of the natural coagulants under study, the present objective is to study the efficiency of blended coagulants: alum and chitin; alum and sago; and alum + chitin + sago. In this attempt, we have reduced the quantity of alum dose and added increasing quantities of the natural coagulants. The surface water samples collected from nearby sources were analyzed for the following parameters pre- and post-treatment with the coagulants. Coagulation and flocculation experiments were carried out using conventional jar test apparatus. Turbidity removal was observed to be nearly 99.29% at all pH ranges and doses. Removal of conductivity, solids and hardness was 58.83%, 32.03% and 33.33%, respectively. From the results obtained, it can be observed that the efficiency of blended coagulants in removal of various physicochemical parameters from the waters was better when compared to individual coagulants. The floc size in blend coagulants was larger than that of single coagulants. The data obtained in this study indicated the coagulation efficiency could be enhanced by using the blend coagulant.

scholarly journals Turbidity removal using natural coagulants derived from the seeds of strychnos potatorum: statistical and experimental approach

2020 ◽  
Vol 888 ◽  
pp. 012064
Author(s):  
Majed Alenazi ◽  
Khalid S. Hashim ◽  
Afrah Abood Hassan ◽  
Magomed Muradov ◽  
Patryk Kot ◽  
...  
Keyword(s):  
Experimental Approach ◽  
Turbidity Removal ◽  
Natural Coagulants ◽  
Strychnos Potatorum

scholarly journals Removal of Fluoride from Water by Adsorption onto Fired Clay Pots: Kinetics and Equilibrium Studies

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
G. P. Kofa ◽  
V. H. Gomdje ◽  
C. Telegang ◽  
S. Ndi Koungou
Keyword(s):  
Ionic Strength ◽  
Rural Areas ◽  
Cost Effective ◽  
Equilibrium Studies ◽  
Fluoride Adsorption ◽  
Jar Test ◽  
Cost Effective Method ◽  
Pseudo Second Order ◽  
Fire Wood ◽  
Clay Pots

Excessive fluoride in potable water is a serious health problem in rural areas of many developing countries. Hence, there is a need to find a simple and cost-effective method for water defluoridation in such areas. In the northern part of Cameroon, clay pots are used for cooking food and water storage. The firing of these pots consists of intensive burning using fire wood. They were tested as a potential adsorbent for removing excess fluoride from water. Experiments were carried out in a jar test at room temperature (25 ± 2°C). Effects of contact time (0–90 min), pH (4, 5, 7, 8, and 9), stirring speed (60, 90, 120, and 200 rpm), and ionic strength (0–1000 mg/L) were investigated. Results showed that equilibrium was attained in 10 min whatever the pH. Pseudo-second-order and pore diffusion models described well the adsorption process. The highest amount of fluoride adsorbed (1.6 mg/g) was obtained at pH 4-5 and the optimum stirring speed is 120 rpm. Ionic strength has a significant effect on fluoride adsorption.

scholarly journals Potential of Hibiscus Sabdariffa and Jatropha Curcas as Natural Coagulants in the Treatment of Pharmaceutical Wastewater

2018 ◽  
Vol 152 ◽  
pp. 01009 ◽  
Author(s):  
Sheena Sibartie ◽  
Nurhazwani Ismail
Keyword(s):  
Oxygen Demand ◽  
Pharmaceutical Wastewater ◽  
High Concentration ◽  
Safe Alternative ◽  
Turbidity Removal ◽  
Jar Test ◽  
Coagulant Dosage ◽  
Natural Coagulants ◽  
High Turbidity ◽  
Maximum Turbidity

Pharmaceutical wastewater is one of the most difficult wastewater to treat due to the presence of pharmaceutical compounds resulting in high concentration of organic matter, high turbidity and Chemical Oxygen Demand (COD). Chemical-based coagulation is a common method used to treat wastewater. However, the issue that has been raised with the use of chemical coagulants is their presence in water after treatment that can cause risks to the human health such as Alzheimer and cancer. Natural coagulants can be used as a safe alternative to these chemicals instead. Therefore, the objective of this experiment was to study the effect of H. Sabdariffa and J. Curcas as natural coagulants, separately and as a combination, on the treatment of pharmaceutical wastewater. Jar test experiment were carried out where beakers of 0.5L wastewater were mixed with the coagulants. The pH of the wastewater was varied from 2 to 12 while the coagulant dosage was varied from 40 to 200 mg/L. It was found that H. Sabdariffa works best at pH 4 and at a coagulant dosage of 190 mg/L with a highest turbidity removal of 35.8% and a decrease of COD by 29%. J. Curcas was found to perform best at pH 3 and with a coagulant dosage of 200 mg/L with a highest turbidity removal of 51% and a decrease of COD by 32%. When J. Curcas and H. Sabdariffa were used in combination, the optimum composition was found to be 80% J. Curcas and 20% H. Sabdariffa by weight with a maximum turbidity removal of 46.8% and a decrease in COD by 46%. In comparison between the two natural coagulants, J. Curcas is found to be a better and more suited coagulative agent for the treatment of pharmaceutical wastewater. The same experiment was carried with alum at pH 6 and coagulant dosage of 750 mg/L and a turbidity removal of 48% and a decrease in COD by 38% were recorded. In comparison with alum, J. Curcas was a better coagulant in treating the pharmaceutical wastewater. This shows that natural coagulants can be used to replace chemical coagulants in the treatment of pharmaceutical wastewater.

Features of support of agriculture (the case of the Tyumen Region)

2020 ◽  
Vol 6 (1) ◽  
pp. 24-48
Author(s):  
Aleksandra G. Balakhnina ◽  
Gulnara F. Romashkina
Keyword(s):  
Rural Areas ◽  
Small Businesses ◽  
Federal Budget ◽  
Cost Effective ◽  
Legal Framework ◽  
State Support ◽  
Budget Planning ◽  
Social Forms ◽  
Regional Budget ◽  
State Programs

This article systematizes the legal framework, forms, and volumes of support for agriculture from the federal budget of Russia and the regional budget (on the example of the Tyumen Region). The authors have performed a detailed analysis of the directions of such support for 2016-2019. The historical, economic and social features of the relationship between the state and agriculture are shown. State support for agriculture is objectively necessary, and competent budget planning makes it possible to develop. However, the dominance of direct forms of spending support does not stimulate cost-effective and innovative activities, which in the future can bring the industry to a competitive level. There is very little and irregular support for social forms, the development of farming and other forms of private farming in rural areas. The authors conclude that the policy of state support is sufficiently provided by legislative acts, resolutions and state programs. Many programs are updated, and new versions are adopted even before the previous ones expire. Such strong volatility hurts strategic projects and agricultural initiatives. Less expensive forms of activity-mediation and trade turn profitable. Living conditions in the villages significantly stay behind in quality and opportunities, which leads to the human capital leaving rural areas. The authors propose to pay more attention to the development of indirect forms of support, to stimulate economic activity and small businesses.

scholarly journals A Pioneering Tactic for Sustainable Waste Management: Design of a Cost-Effective Recycling Machine

2018 ◽  
Vol 172 ◽  
pp. 03003
Author(s):  
A. Agarwal
Keyword(s):  
Waste Management ◽  
Rural Areas ◽  
General Public ◽  
Cost Effective ◽  
Force Analysis ◽  
Mechanical Advantage ◽  
Vital Importance ◽  
Project Study ◽  
Original Size ◽  
Assembly Operations

In this paper we discussed the new design, fabrication and testing of a mechanical can crusher taking into deliberation the force analysis and ergonomic factors that will enable people to use this mechanical can crusher especially in Botswana rural areas. The process of crushing cans is of vital importance as it saves a percentage of space for can disposal and also makes it easier for these cans to be transported to recycling centers or landfill areas. The methods and processes used to bring this project to life include welding, cutting, bending, drilling and assembly operations. This project study is mainly about generating a new concept of a mechanical can crusher that is compact to transport from one location to another and makes can crushing easy and fascinating to the general public so as to promote people buy into crushing in Sub-Sahara market. Even though there are numerous sorts of the mechanical would crusher be able to as of now in presence, this model provides a more practical usage than previous one with the desired mechanical advantage of 10, machinability to crush the entire cans to 25% of their original size and 100% efficiency for the entire rounds.

Treatment of Textile Wastewater using Biodegradable Flocculants of Chitosan and Extracted Pandan Leaves

2013 ◽  
Vol 64 (1) ◽  
Author(s):  
Norzita Ngadi ◽  
Nor Aida Yusoff
Keyword(s):  
Solvent Extraction ◽  
Extraction Method ◽  
Textile Wastewater ◽  
Settling Time ◽  
Turbidity Removal ◽  
Test Experiment ◽  
Jar Test ◽  
Solvent Extraction Method ◽  
Flocculation Process

The study investigated the performance of chitosan and extracted pandan leaves towards treatment of textile wastewater by using flocculation process. Pandan leaves were extracted by using solvent extraction method. Flocculation process was conducted using a Jar test experiment. The effect of dosage, pH, and settling time on reduction of COD, turbidity and color of textile wastewater was studied. The results obtained found that chitosan was very effective for reduction of COD, turbidity, color and indicator for color. The best condition for COD and turbidity removal was achieved at 0.2 g dosage, pH 4 and 60 minutes of settling time. Under this condition, about 58 and 99% of COD and turbidity was removed, respectively. However, the results obtained using extracted pandan was opposite compared to the chitosan. Extracted pandan was not able to remove both COD and turbidity of the waste. 

A community-based approach to evaluation of health outcomes and costs for telepsychiatry in a rural population: Preliminary results

2000 ◽  
Vol 6 (1_suppl) ◽  
pp. 155-157 ◽  
Author(s):  
Craig Kennedy ◽  
Peter Yellowlees
Keyword(s):  
Mental Health ◽  
Health Outcomes ◽  
Rural Areas ◽  
Pilot Trial ◽  
Public Mental Health ◽  
Cost Effective ◽  
Community Based ◽  
Public And Private ◽  
Preliminary Results ◽  
The People

A pilot trial was established to support visiting psychiatric services and local public and private practitioners through the use of videoconferencing. The purpose of the trial was to determine whether people in the community received better health-care with telemedicine. A community-based approach was used to evaluate health outcomes, costs, utilization, accessibility, quality and needs for such services in a rural community in Queensland. Over a two-year period data were collected from 124 subjects who met the criteria of having a mental health problem or mental disorder. Nine further subjects refused to participate in the study. Only 32 subjects used videoconferencing to receive mental health services. Preliminary results did not show any significant improvements in wellbeing or quality of life, although the time span was relatively short. However, the results confirmed that the people were no worse off from a consumer or a practitioner perspective from using videoconferencing. Most consumers found that videoconferencing with a psychiatrist moderately or greatly helped them in managing their treatment, with 98% of them preferring to be offered videoconferencing in combination with local services. Overall, videoconferencing is a crucial part of enhancing psychiatry services in rural areas. However, it is not necessarily cost-effective for all consumers, general practitioners, psychiatrists, or the public mental health service.

scholarly journals Lime-Stabilized Black Cotton Soil and Brick Powder Mixture as Subbase Material

2018 ◽  
Vol 2018 ◽  
pp. 1-5 ◽  
Author(s):  
S. Srikanth Reddy ◽  
A. C. S. V. Prasad ◽  
N. Vamsi Krishna
Keyword(s):  
Powder Mixture ◽  
Rural Areas ◽  
Flexible Pavements ◽  
Cost Effective ◽  
Local Area ◽  
Black Cotton Soil ◽  
Brick Kilns ◽  
Brick Powder ◽  
Swelling Characteristics ◽  
Shrinkage And Swelling

Various researchers, for the past few decades, had tried to stabilize black cotton soil using lime for improving its shrinkage and swelling characteristics. But these days, the cost of lime has increased resulting in increase in need for alternative and cost effective waste materials such as fly ash and rice husk ash. Brick powder, one among the alternative materials, is a fine powdered waste that contains higher proportions of silica and is found near brick kilns in rural areas. The objective of the study is to investigate the use of lime-stabilized black cotton soil and brick powder mixture as subbase material in flexible pavements. Black cotton soil procured from the local area, tested for suitability as subbase material, turned out to be unsuitable as it resulted in very less CBR value. Even lime stabilization of black cotton soil under study has not showed up the required CBR value specified for the subbase material of flexible pavement by MORTH. Hence the lime-stabilized black cotton soil is proportioned with brick powder to obtain optimum mixture that yields a better CBR value. The mixture of 20% brick powder and 80% lime-stabilized black cotton soil under study resulted in increase in the CBR value by about 135% in comparison with lime-stabilized black cotton soil. Thus it is promising to use the mixture of brick powder and lime-stabilized black cotton soil as subbase material in flexible pavements.

scholarly journals Karakterisasi Ekstrak Tapioka dan Tapioka Ionik sebagai Biokoagulan dalam Proses Pengolahan Air

2018 ◽  
Vol 19 (2) ◽  
pp. 165
Author(s):  
Eka Prihatinningtyas ◽  
Agus Jatnika Effendi
Keyword(s):  
Ion Exchange ◽  
Isoelectric Point ◽  
Ftir Analysis ◽  
Active Components ◽  
Turbidity Removal ◽  
Natural Coagulant ◽  
Coagulation Process ◽  
Or Groups ◽  
Natural Coagulants ◽  
Artificial Water

ABSTRACTThe ability of tapioca to act as natural coagulants (biocoagulants) was tested using artificial water. As turbidity was added as kaolin. This research aimed to determine the compounds and or groups that act as natural coagulant and to describe the mechanism of flocculation: extraction which yields tapioca extract and ion exchange which yields ionic tapioca. Coagulation process was performed at three different initial turbidities, i.e. 50 NTU (low turbidities), 150 NTU (middle turbidities) and 300 NTU (high initial turbidites). At the same condition (coagulant dose 20 ppmv, pH 5), ionic tapioca yield better turbidity removal compared tapioca extract i.e 11.2% at low initial turbidites; 2.4% at middle initial turbidities and 12.8% at high initial turbidities. FTIR analysis  showed that tapioca extract and ionic tapioca contained of carboxyl, hydroxyl and amides groups which  can act as active components on coagulation process. The presence of those groups caused positive and negative charges (amphoter). Coagulation process ran efficiently at pH 5 because the isoelectric point is obtained at that condition.Keyword : bio coagulants, coagulation,  coagulant agents, ionic tapioca, tapioca extract,ABSTRAK Kemampuan tepung tapioka sebagai koagulan alami (biokoagulan) telah diuji dengan menggunakan limbah artifisial dari kaolin. Penelitian ini bertujuan untuk menentukan senyawa atau gugus yang berperan sebagai biokoagulan dan menjelaskan mekanisme flokulasi yang terjadi. Perlakuan awal tapioca sebelum digunakan sebagai koagulan adalah ekstraksi yang menghasilkan ekstrak tapioka  dan pertukaran ion  yang menghasilkan tapioka ionik. Proses koagulasi dilakukan pada 3 macam kekeruhan awal yaitu 50 NTU (kekeruhan rendah), 150 NTU (kekeruhan sedang) dan 300 NTU (kekeruhan tinggi). Pada kondisi operasi yang sama (dosis 20 ppmv dan pH 5), tapioka ionik memberikan efisiensi penurunan kekeruhan yang lebih tinggi, yaitu sebesar 11,0% pada kekeruhan awal 50 NTU; 2,4% pada kekeruhan awal 150 NTU dan 12,8% pada kekeruhan awal 300 NTU. Hasil analisa FTIR menunjukkan bahwa ekstrak tapioka dan tapioka ionik mempunyai gugus karboksil (-OH), gugus karboksil (-COOH) dan gugus amida (-CONH2). Keberadaan ketiga gugus tersebut menyebabkan biokoagulan ini memiliki muatan positif dan negatif sekaligus (amfoter). Proses koagulasi berjalan dengan efisien pada pH 5 karena titik isoelektrik diperoleh pada pH tersebut. Kata kunci : biokoagulan, koagulasi, agen koagulan, ekstrak tapioka, tapioka ionik

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