METHODS OF WATER PURIFICATION AT THE STAGE OF WATER TREATMENT FOR FEEDING BOILERS AND THEIR OWN TECHNOLOGICAL NEEDS AT THE PLANT CHPP

2021 ◽  
Vol 3 (1) ◽  
pp. 099-103
Author(s):  
M. V. Vasina ◽  
◽  
A. S. GOLYSH ◽  
K. V. TROFIMENKO ◽  
◽  
...  
Keyword(s):  
Water Treatment ◽  
Water Purification ◽  
Quantitative Composition ◽  
Source Water ◽  
Initial Water ◽  
Qualitative And Quantitative ◽  
Pre Treatment ◽  
The Cost ◽  
Selection Of

This work consists of the characteristics of production, assessment of the qualitative and quantitative composition of water, consideration of the process of water purification in the chemical shop, comparison and selection of coagulants and flocculants, and demonstration of the most affordable technology used at the CHPP which increases the efficiency of source water purification. The problem of pretreatment of the source water has always been relevant. The quality of the water used depends on the operation of boilers and turbines at the CHPP. The paper presents the average annual indicators of the quality of the source water, pre-treatment methods, and considers which reagents that do not require the cost of reconstruction of clarifiers can improve their performance. The initial water after the application of the test samples of coagulants and flocculants was studied. Conclusions are drawn about the work of clarifiers after the use of the proposed reagents.

scholarly journals THE USE OF CATALYTIC NEUTRALIZATION FOR THE PURIFICATION OF EXHAUST GASES FROM MARINE POWER PLANTS IN AN AGGRESSIVE ENVIRONMENT

2020 ◽  
pp. 157-166
Author(s):  
Nina N. Gorlova
Keyword(s):  
Power Plants ◽  
Material Selection ◽  
Point Of View ◽  
Quantitative Composition ◽  
Qualitative And Quantitative ◽  
Aggressive Environment ◽  
Catalytic Material ◽  
The Cost ◽  
Selection Of

    Among the methods used, the most effective, from the point of view of the quality of cleaning from the main harmful substances, is catalytic neutralization. The effectiveness of using this method is largely determined by the properties and characteristics of the used catalytic material. Selection of the appropriate composition determines the provision of physical, physico-mechanical and corrosive properties of the used catalytic materials. In this regard, the possibilities of using steel oxide and molding clay as basic components in the charge of the material were studied. In order to reduce the cost of the treatment system, the possibility of replacing valuable expensive components with ore mills of the appropriate composition was considered.As a result of the studies, the optimal qualitative and quantitative composition of the charge of the catalytic material was determined.

scholarly journals An approach to identify soil types by using hydraulic conductivity values

2018 ◽  
Vol 2 (1) ◽  
pp. 43-51
Author(s):  
Maritha Nilam Kusuma ◽  
Wahyono Hadi ◽  
Budisantoso Wirjodirdjo ◽  
Yulfiah Yulfiah
Keyword(s):  
Water Treatment ◽  
Hydraulic Conductivity ◽  
Preliminary Analysis ◽  
Soil Types ◽  
Main Role ◽  
Important Indicator ◽  
Pre Treatment ◽  
Constant Head ◽  
Soil Filtration

Water treatment in Indonesia still uses coagulant to reduce the contaminant. Therefore, an infiltration gallery is required as the pre-treatment before conventional water treatment conducted. Infiltration gallery is a natural technology for absorbing or filtrating the contaminant. The hydraulic conductivity plays the main role in soil filtration. There are many types of soil with different hydraulic conductivities. In infiltration gallery method it is important to identify the hydraulic conductivity value as the preliminary analysis because it is the important indicator to show the ability of soil to flow the water from one side to other sides when filtrating the contaminant. The slower the conductivity is, the better the quality of the water will be. The method used in this study was the Constant head Permeameter. The result of this study shows that the same type of soil type has different hydraulic conductivities.

Application of Variational Geometry to the Analysis of Mechanical Tolerances

1989 ◽  
Author(s):  
P. M. Martino ◽  
G. A. Gabriele
Keyword(s):  
Mechanical Design ◽  
Worst Case Analysis ◽  
Prototype System ◽  
Tolerance Design ◽  
Worst Case ◽  
Geometric Tolerances ◽  
Solid Models ◽  
The Cost ◽  
Selection Of

Abstract The proper selection of tolerances is an important part of mechanical design that can have a significant impact on the cost and quality of the final product. Yet, despite their importance, current techniques for tolerance design are rather primitive and often based on experience and trial and error. Better tolerance design methods have been proposed but are seldom used because of the difficulty in formulating the necessary design equations for practical problems. In this paper we propose a technique for the automatic formulation of the design equations, or design functions, which is based on the use of solid models and variational geometry. A prototype system has been developed which can model conventional and statistical tolernaces, and a limited set of geometric tolerances. The prototype system is limited to the modeling of single parts, but can perform both a worst case analysis and a statistical analysis. Results on several simple parts with known characteristics are presented which demonstrate the accuracy of the system and the types of analysis it can perform. The paper concludes with a discussion of extensions to the prototype system to a broader range of geometry and the handling of assemblies.

scholarly journals FAKTOR KEPUASAN WISATAWAN PENGGUNA TRANSPORTASI LAUT DARI BALI KE GILI TRAWANGAN

Jurnal IPTA ◽  
2018 ◽  
Vol 6 (2) ◽  
pp. 124
Author(s):  
Syukriyan Abrar Syah ◽  
Ni Gusti Ayu Susrami Dewi ◽  
Putu Agus Wikanatha Sagita
Keyword(s):  
Quality Of Service ◽  
Dominant Factor ◽  
Sea Transport ◽  
Marine Transportation ◽  
Factors Affecting ◽  
Cost Factor ◽  
Level Of Satisfaction ◽  
The Cost ◽  
Selection Of

This research aims to analyze factors affecting the satisfaction of tourists in the use of marine transportation from Bali toward Gili Trawangan. The benefits of this research useful to the company in improving the services for tourists who will use the services of a crosswalk leading to Gili Trawangan.The respondents in this research totalled 190 respondents, the selection of the sample using the method of purposive sampling, the data in this study were analyzed using the analysis factors that help by statistikal program SPSS version 17.0 for windows. The results of this study are: 1) the satisfaction of tourists in the use of sea transport in general are at a level of satisfaction. 2) there are three factors that affect the satisfaction of tourists formed i.e. factors quality of maids, the cost factor & ease factors and product quality. Quality of service factor is the most dominant factor influencing the satisfaction of travellers with variable reliability as the dominant variables, and the variable availability schedule is a variable that must be improved.

scholarly journals Bench scale study of moving bed biofilm reactor application as pre-treatment of raw water for water treatment plant (Case study: Pesanggrahan River)

2019 ◽  
Vol 270 ◽  
pp. 04009
Author(s):  
Rhefa Fauza Setiani ◽  
Setyo Sarwanto Moersidik ◽  
Sandyanto Adityosulindro
Keyword(s):  
Water Treatment ◽  
Residence Time ◽  
Treatment Process ◽  
Ammonia Removal ◽  
Biofilm Reactor ◽  
Raw Water ◽  
Moving Bed Biofilm Reactor ◽  
Moving Bed ◽  
Pre Treatment

The quality of surface water in Jakarta is on a serious polluted status. In order to reduce the Water Treatment processing load, a pre-treatment process is needed to eliminate parameters such as organic matter, ammonia, color, taste, and odor. This treatment generally uses chemical and physical processes, such as chlorination and activated carbon that produce harmful byproducts. Moving Bed Biofilm Reactor (MBBR) is one of the solutions developed to reduce the nutrient and organic levels in raw water. This study aims to improve the quality of raw water, by reducing the concentration of COD, NH3-N, Phosphate, and TSS before entering the conventional process. Reactor performance is assessed based on contaminant removal efficiency with variation of residence time (1 hour, 1.5 hours, 2 hours). The reactor is operated by using Kaldness K1 as the medium and oxygen supply of 7 L/min. The optimum residence time is 1,5 hours with the ability to remove COD, NH3-N, Phosphate, TSS 51.8% ± 0.2; 54.3% ± 0.28; 52.6% ± 0.19; and 77.7% ± 0.14 respectively. Based on the optimum residence time, the kinetics of the ammonia removal rate in MBBR takes place at zero order, with a rate constant removal of 0.0056 g/m2.day. The results showed that the higher concentration of ammonia, and organic contaminants treated, the higher the efficiency of MBBR. Apart from water quality improvement, pre-treatment process using MBBR can reduce coagulant dose from 50 mg/L to 9 mg/L, to decrease raw water turbidity from 135 NTU to 0.68 NTU before entering the coagulation-flocculation unit.

scholarly journals USE OF MODIFIED REAGENTS SOLUTIONS WHEN PREPARING DRINKING WATER

2021 ◽  
Vol 6 (166) ◽  
pp. 141-145
Author(s):  
S. Dushkin ◽  
T. Shevchenko ◽  
O. Galkina
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Suspended Solids ◽  
Aluminum Sulfate ◽  
Technology Development ◽  
Environmental Safety ◽  
Aluminum Salts ◽  
The Cost ◽  
Clarified Water

Currently, attention is paid to the intensification of the process of natural and wastewater treatment, improvement of technology, development of new effective methods of intensification of water treatment. This will simplify the existing technology of water treatment, reduce labor-intensive processes of preparation and dosing of reagents, reduce the cost of operating treatment plants, increase their productivity, improve quality and reduce the cost of treated water. Treatment of water with a modified coagulant solution allows to increase the hydraulic size of the coagulated suspension. The strongest effect of the modified coagulant solution has on the hydraulic suspension size of 0.2 mm/s and less, i.e. the smallest and the suspension, which is difficult to remove, which creates conditions for more intensive sedimentation in settling tanks and improve the quality of water clarification and fed to fast filters. It has been experimentally determined that the treatment of water with a modified solution of aluminum sulfate coagulant should be performed when the content of suspended solids in the clarified water is up to 100–150 mg / dm3. The color of the clarified water during treatment with a modified solution of aluminum sulfate coagulant does not depend on the content of suspended solids and is 1.5-1.6 times lower than the color than when using a conventional coagulant solution. It is established that the use of a modified solution of aluminum sulfate coagulant in water purification can reduce the residual aluminum content in clarified water by an average of 50-60%. The results of researches of the modified solutions of reagents which are used at preparation of drinking water are presented. It is established that water treatment with a modified solution of aluminum sulfate coagulant allows to improve the quality of drinking water preparation by suspended solids, color, reduce the content of aluminum salts in the clarified water, thereby increasing the environmental safety of drinking water.

scholarly journals Research on the Package Feature Selection of Talent Attracting Factors in International Trade in Guangdong-Hong Kong-Macao Greater Bay Area

2021 ◽  
Vol 292 ◽  
pp. 02029
Author(s):  
Fei Lei ◽  
Liangmei Luo ◽  
Hang Yang ◽  
Qinhui Li ◽  
Feng Chen
Keyword(s):  
Quality Of Life ◽  
International Trade ◽  
Hong Kong ◽  
Survey Questionnaire ◽  
Bay Area ◽  
Housing Subsidies ◽  
Feature Filtering ◽  
The Cost ◽  
Selection Of

This paper designs a survey questionnaire based on the Guangdong-Hong Kong-Macao Greater Bay Area’s demand for talents in international trade, adds job types, filters through package features, and performs feature filtering with the error filter criteria set in this paper, and conducts logistic regression analysis on talent types, so as to realize the classification and dynamic analysis of talents. The dynamic needs of various types of talents in international trade in the Guangdong-Hong Kong-Macao Greater Bay Area are drawn, and specific measures such as increasing salaries and benefits, reducing living costs, providing housing subsidies, solving children's employment problems, and ensuring quality of life are proposed for the development of international trade talents. Reducing the cost of talent migration can promote them to make more contributions to the Guangdong-Hong Kong-Macao Greater Bay Area. This will help the Guangdong-Hong Kong-Macao Greater Bay Area government to attract outstanding international trade talents and formulate detailed and feasible strategies, which has certain reference significance.

Emergency Treatment Measures for Sudden Pollution Incidents in Source Water with some Contaminants: A Review

2013 ◽  
Vol 781-784 ◽  
pp. 1950-1953 ◽  
Author(s):  
Hong Tao Wang ◽  
Xue Bin Jia ◽  
Dong Mei Liu ◽  
Zhi Wei Wang ◽  
Yun Hao Pan
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Water Purification ◽  
Seasonal Variability ◽  
Emergency Treatment ◽  
Treatment Process ◽  
Source Water ◽  
High Concentration ◽  
Water Treatment Process ◽  
Treatment Measures

Source water polluted by algae, ammonium and organic matter has been studied for many years. Sudden pollution incidents of source water have been reported across the whole country. Seasonal variability of rainfall across China has resulted in floods or droughts, thus incurred the high concentration of algae, ammonium and organic matter, causing severe challenges to the conventional water purification facilities. However, the conventional water treatment process is often unavailable to keep the safety of source water for drinking when sudden pollution occurs. Meanwhile, byproducts are often to be found over the whole treatment process, it is high time that researchers took effective measures to deal with this problem. In the present work, an overview of the recent research dealing with source water suddenly polluted by algae, ammonium and organic matter is presented.

scholarly journals Predictive model of the dependence of the cost of insulation on thermal characteristics

2019 ◽  
Vol 140 ◽  
pp. 04018
Author(s):  
Olga Gamayunova ◽  
Anton Radaev ◽  
Mikhail Petrichenko ◽  
Raimond Bogdanivics
Keyword(s):  
Thermal Conductivity ◽  
Mathematical Model ◽  
Predictive Model ◽  
Building Materials ◽  
Thermal Characteristics ◽  
Average Density ◽  
Coefficient Of Determination ◽  
The Cost ◽  
Selection Of

In the market of building materials today there is a large selection of various thermal insulation materials, differing in cost, thermal conductivity and other characteristics. This article describes the predictive model of the cost of insulation from thermal characteristics, such as: thickness, thermal conductivity, (average) density, water absorption and combustibility group. The coefficient of determination was used to assess the quality of the obtained economic-mathematical model. The described predictive model can be effectively used to solve problems associated with determining the optimal characteristics of insulation by the criterion of minimizing cost.

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