ارزیابی فنی و اقتصادی استفاده از پمپهای دور متغیر در شستشوی معکوس فیلترهای ماسهای تند( مطالعه موردی)
Journal Title: آب و فاضلاب - Year 2017, Vol 28, Issue 4
Abstract
Technical and Economic Evaluation of the Use of Variable Speed Pumps in the Backwashing of Rapid Sand Filters (A Case Study) S. Azodi1, M. Fazeli2 1. MSc Student of Civil and Water & Wastewater Engineering, Faculty of Water & Environment, Abbaspour College of Technology, Shahid Beheshti University, Tehran (Corresponding Author) 09102002857 sina.azodi@yahoo.com 2. Assist. Prof. of Civil and Water & Wastewater Engineering, Faculty of Water & Environment, Abbaspour College of Technology-Shahid Beheshti University, Tehran (Received Aug. 13, 2015 Accepted Apr. 3, 2016) Abstract It is observed that physical changes in the filter as bed media size variation, nozzle breakage, or water temperature variations lead to changes in the backwash regime throughout the year. The remedy proposed in this article is to use variable speed pumps in order to maintain a constant and steady optimum regime. In this study, experiments were performed using a full-scale single-layer rapid sand filter to find the optimum bed expansions of 7-8%. In addition, previous research has shown that air and backwash water flows need to be slowly and gradually increased to the optimum design values in order to avoid sand boil. In a typical treatment plant, this is normally controlled by globe valves, which results in the waste of energy and variation in pump and blower pressures. Application of variable speed pumps has the advantage that a constant pressure can be maintained throughout to yield an optimum backwash regime. Variable speed pumps provide various backwash regimes which enable design engineers and water plant operators to determine the optimum expansion in sand bed filters. This range of optimum bed expansion was found to lead to such improvements as shorter filter ripening, reduced effluent turbidity to levels below 0.3 NTU, conservation of backwash water by up to 15‒20%, and savings in backwash pump power consumption by up to 30-50%.
Authors and Affiliations
Sina Azodi, Mojtaba Fazeli
توسعه عملکرد روشهاي تعمير خطوط لوله فاضلاب به کمک روشهاي نوين حفاريهاي بدون ترانشه (مطالعه موردي: شهر اصفهان) Developing the Performance of Sewage Pipelines Repairing Using Trenchless Methods (Case Study: Isfahan)
Abstract Nowadays, the using modern trenchless methods for repairing sewer networks have been developed in most countries. Generally, for repairing the sewage lines using trenchless methods, bypassing the repair zone is...
حذف آنيون کروم شش ظرفيتي از محلولهاي آبي با استفاده از ماده نانو حفره MCM-41 عاملدار شده با گروه آميني
Removal of Cr(VI) from Aqueous Solutions Using Amino-functionalized Nanoporous MCM-41 Abstract An amino-functionalized nanoporous material was prepared by grafting 3-aminopropyl trimethoxysilane (APTMS) group onto MC...
اثربخشی کلات دی تی پی ای بر قابلیت دسترسی کادمیوم در یک خاک تیمار شده
Effectiveness of DTPA Chelate on Cd Availability in Soils Treated with Sewage Sludge P. Houshyar1, A.H. Baghaie2 1. Former Graduate Student of Soil Scinece, Arak Branch, Islamic Azad University, Arak, Iran 2. Assist....
بررسي اثر اسيديته و اسيد هيوميک بر راندمان حذف نيترات از آب توسط نانوذرات آهن صفر
Effect of Humic Acid and Acidity on Nitrate Removal from Water Using Zero Valent Iron Nanoparticles (FeNps) Abstract Nitrate is a wide spread pollutant whose removal from aquesous solutions is a major goal of water tr...
بهينهسازي حذف ترکيب دارويي سيپروفلوکساسين با فرايند انعقاد الکتروشيميايي با مدل آماري رويه پاسخ از محيطهاي آبي
Optimization of Electrocoagulation via Response Surface Methodology to Remove Ciprofloxacin from Aqueous Media The response surface statistical model developed via the central composite design (CCD) is a tool for optimi...