نتایج جستجو برای: uv254

تعداد نتایج: 108  

ژورنال: :مجله دانشگاه علوم پزشکی ایلام 0
محمد ملکوتیان امیر حسین محوی محمدرضا حیدری علی مصطفوی

مقدمه: حذف مواد آلی طبیعی به علت پیش ساز بودن ترکیبات خطرناک ارگونوهالوژنه در آب برای حفظ کیفیت آب شرب حائز اهمیت است. روش های معمول تصفیه آب نمی توانند کیفیت آب را از نقطه نظر تقلیل مواد آلی محلول و نامحلول تا حدود مجاز تضمین نمایند. در تصفیه خانه آب، فرایند انعقاد جایگاه ویژه ای دارد. تلاش بر این است که با صرف هزینه کم بر راندمان انعقاد افزوده شود. هدف از این مطالعه مقایسه عملکرد ماده منعقد ک...

2015
Xuemin Lv Yi Lu Xiaoming Yang Xiaorong Dong Kunpeng Ma Sanhua Xiao Yazhou Wang Fei Tang

A total of 54 water samples were collected during three different hydrologic periods (level period, wet period, and dry period) from Plant A and Plant B (a source for Yangtze River and Hanshui River water, respectively), and several water parameters, such as chemical oxygen demand (COD), turbidity, and total organic carbon (TOC), were simultaneously analyzed. The mutagenicity of the water sampl...

Journal: :The Science of the total environment 2013
Chengkun Wang Xiaojian Zhang Jun Wang Shuming Liu Chao Chen Yuefeng Xie

Knowledge of N-nitrosamine precursors from dissolved organic matter (DOM) is important for water professionals to better control N-nitrosamine formation. The characterization of DOM from the Luan River in Northern China was conducted using Amberlite XAD resins and ultra-filtration methods. N-nitrosamine formation potentials were investigated for various DOM fractions. The removal of the DOM dur...

2014
Zhengchao Xie Inchio Lou Wai Kin Ung Kai Meng Mok Sheng-yong Chen

Understanding and predicting dynamic change of algae population in freshwater reservoirs is particularly important, as algae-releasing cyanotoxins are carcinogens that would affect the health of public. However, the high complex nonlinearity of water variables and their interactions makes it difficult to model the growth of algae species. Recently, support vector machine SVM was reported to hav...

Journal: :Environmental Engineering Research 2023

Mn loaded AC (Mn/AC), Cu (Cu/AC), and Fe (Fe/AC) catalysts were prepared by the impregnation-calcination method, which can be used to degrade Basic Yellow 28 dyes in simulated printing dyeing wastewater for catalytic ozonation. The catalyst preparation reaction conditions optimized with degradation efficiency of chemical oxygen demand (COD) absorbance some organic compounds under 254 nm UV ligh...

Journal: :Agronomy 2023

Refractory humic substances (HSs), which include and fulvic acid as well hydrophilic portion, are the prime pollutants of stabilized landfill leachate with a concentrated color chemical oxygen demand (COD). Spectroscopic microscopic analysis remaining in pollutant contributor were conducted this study. Microfiltration centrifugation processes applied to fractionate from HSs leachate. The three-...

Journal: :Sustainability 2022

In order to improve the treatment processes of drinking water plant (DWTP) located near Butoniga reservoir in Istria (Croatia), a prediction quality index (WQI) was done. Based on parameters such as temperature, pH, turbidity, KMnO4, NH4, Mn, Al and Fe, calculation WQI conducted, while for models, along with mentioned parameters, O2, TOC UV254 were additionally used. Four models built predict t...

Journal: :Environmental Science & Technology 2021

The disinfection susceptibilities of viruses vary even among variants, yet the inactivation efficiency a certain virus genotype, species, or genus was determined based on susceptibility its laboratory strain. objectives were to evaluate variability in free chlorine, UV254, and ozone 13 variants coxsackievirus B5 (CVB5) develop model allowing for predicting overall heterogeneous CVB5. Our result...

2017
Lili Song Bo Zhu Stephen Gray Mikel Duke Shobha Muthukumaran

Evaluation of an advanced wastewater treatment system that combines photocatalysis with ceramic membrane filtration for the treatment of secondary effluent was undertaken. The results showed that, after photocatalysis and ceramic membrane filtration, the removal of dissolved organic carbon and UV254 was 60% and 54%, respectively, at a concentration of 4 g/L of TiO₂. Dissolved organic matter (DO...

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