نتایج جستجو برای: introduction conventional water treatment consist of unit processes include coagulation

تعداد نتایج: 21390409  

this thesis attempts to investigate the effects of prelistening activities on enhancing iranian efl learners` listening comprehension. the present study investigated ways in which learners` background knowledge could be activated in order to enhance their l2 listening comprehension by limiting the number of possible text interpretations prior to listening. the experiments conducted in this study examined the effect of prior knowledge and vocabulary teaching on iranian efl learners listening comprehension. the current study has two purposes: one is to investigate the effect of background knowledge on the second language listening comprehension of iranian intermediates and the other is to determine whether second language is facilitated by the introduction of unknown vocabularies in the form of prelistening activities. to conduct the study different instruments such as listening proficiency test and four listening tests such as pre and posttests were used and various statistical processes and techniques including paired-sample t-test, and analysis of variance (anova) were used. the findings of this study supported all three hypotheses tested. differences were found between the means of preteaching vocabulary variable, the background knowledge activation variable, and mean difference between these two strategies variable. subjects scored higher when the unknown words were taught in advance. likewise, subjects scored higher when they were asked some relevant questions about the topic than on those without them. there was, in addition, a significant difference between the means of preteaching vocabulary strategy and background knowledge activation strategy. in fact, preteaching vocabulary had a better effect in enhancing the students’ listening comprehension, in comparison to background knowledge activation strategy.

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد تهران مرکزی - دانشکده زبانهای خارجی 1390

this thesis attempts to investigate the effects of prelistening activities on enhancing iranian efl learners` listening comprehension. the present study investigated ways in which learners` background knowledge could be activated in order to enhance their l2 listening comprehension by limiting the number of possible text interpretations prior to listening. the experiments conducted in this stud...

Journal: :Water science and technology : a journal of the International Association on Water Pollution Research 2014
Tianjiao Guo James Englehardt Tingting Wu

The US National Research Council recently recommended direct potable water reuse (DPR), or potable water reuse without environmental buffer, for consideration to address US water demand. However, conveyance of wastewater and water to and from centralized treatment plants consumes on average four times the energy of treatment in the USA, and centralized DPR would further require upgradient distr...

Journal: :iranian journal of public health 0
s.nasseri m. shariat h. mohamadi

this survey is carried out with the major objective of studying various water treatment plants in iran. the emphasis was on the plants being fed by surface water resources; also the clarification unit was taken as the major one among treatment processes. in this way 25 water treatment plants located in different cities of iran were studied from the point of view of technical specifications chem...

ژورنال: طلوع بهداشت یزد 2016
ابراهیمی, اصغر, احرام پوش, ، محمد حسن, دهقانی, علی, شهریاری فارفانی, علیرضا, قانعیان, محمد تقی, مختاری, مهدی,

Abstract Introduction: Considering the important role of industry in polluting the environment, the present study aimed to evaluate the performance of chemical coagulation together with advanced oxidation (peroxone) regarding dye wastewater treatment of appliance factories. Methods: This study was experimental, which it’s pilot-scale was conducted on the wastewater of the pa...

2015
Joop C. Kruithof Bram J. Martijn Ashlee L. Fuller RaeAnna Hughes James P. Malley

Requirements of a treatment process for drinking water production from challenged surface water sources shifted over the past decades. The role UV can play in an integrated treatment approach is illustrated by a case study discussing the various research results leading to treatment upgrades at Andijk. The paper describes the feasibility of advanced oxidation based on MP UV/ H2O2 treatment for ...

In this paper a comprehensive model is proposed to simulate combined cycle water and power process (CCWP) based on thermal desalination. In order to verify the performance of model, Al-Taweelah cogeneration plant in UAE is thermodynamically simulated by Thermoflex V.19 and the results are compared with actual operating conditions. Considering shortcomings of mentioned unit, a cogeneration combi...

Journal: :Journal of community based environmental engineering and management 2023

In the drinking water treatment plant involves a significant component i.e., coagulation, which distributed coagulants vastly and equally through rapid stirring for destabilizing colloids suspended particles in raw water. plants, coagulation units are often classified into mechanical hydraulic coagulation. This study aimed to discover use of in-line static mixers as designing Duren Seribu II Dr...

Journal: :IOP conference series 2022

Abstract Coagulation and flocculation are essential components of drinking water treatment, because they provide a reliable process for treating turbidity. This study aims to use design criteria that can be used Cimanggis Water Treatment Plant (WTP), so it produce fulfills the Drinking Quality Standard No. 492 Year 2010 by Health Minister Republic Indonesia. The WTP development refers existing ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - پژوهشکده مهندسی فرایند 1395

abstract: mineral scaling in oil and gas production equipment is one of the most important problem that occurs while water injection and it has been recognized to be a major operational problem. the incompatibility between injected and formation waters may result in inorganic scale precipitation in the equipment and reservoir and then reduction of oil production rate and water injection rate. ...

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