نتایج جستجو برای: sludge settle ability improved and sludge volume index (svi) decreased to 82 and 95 respectively.

تعداد نتایج: 18430959  

Journal: :محیط شناسی 0
ناصر مهردادی دانشیار دانشکدة محیط زیست دانشگاه تهران احمدرضا محمدی دانشجوی دکتری مهندسی محیط زیست، دانشکدة محیط زیست دانشگاه تهران علی ترابیان استاد دانشکدة محیط زیست دانشگاه تهران

the activated sludge process is the most widely used biological wastewater treatment for both domestic and industrial plants in the world. one of the drawbacks of conventional activated sludge (cas) processes is high sludge production. excess sludge treatment and disposal currently represents a rising challenge for wastewater treatment plants (wwtps) due to economic, environmental and regulatio...

2005
W. Janczukowicz M. Szewczyk M. Krzemieniewski J. Pesta

The purpose of this work was to examine the settling properties of activated sludge from a sequencing batch reactor (SBR). The experiments were carried out in a bench-scale reactor, fed with wastewater from the University of Olsztyn treatment plant. Concentrations of the examined activated sludge varied between 2.5 and 6.0 kg SS m. Laboratory analyses of the sludge comprised: sludge concentrati...

Journal: :international journal of environmental research 2012
t. onodera s. sase p. choeisai w. yoochatchaval h. sumino

a combination of an acidification reactor and an up-flow staged sludge bed (ussb) reactor wasapplied to treatment of molasses wastewater. the ussb, equipped with three gas solid separators, wasselected because of superior organic removal by means of good retention of granular sludge. the combinedsystem was continuously operated at mesophilic (35°c) conditions for 600 days. the ussb achieved a h...

Background and purpose: One of the solutions for sludge production is to reduce that via decreasing the yield coefficient by oxic-settling anoxic process with different oxidation reduction potential (ORP) in sequencing batch reactor (SBR) activated sludge. Materials and methods: We used 2 SBR reactors (20 L volume) that were controlled online. At a steady state in reactors, some parameters suc...

Journal: :international journal of environmental research 0
t. onodera center for regional environmental research, national institute for environmental studies, ibaraki 305-8506, japan s. sase center for regional environmental research, national institute for environmental studies, ibaraki 305-8506, japan- department of civil and environmental engineering, nagaoka university of technology, niigata 940-2188, japan p. choeisai department of environmental engineering, khon kaen university, khon kaen 40002, thailand w. yoochatchaval department of environmental engineering, king mongkut’s university of technology thonburi, thailand h. sumino department of civil engineering, gifu national college of technology, gifu 501-0495, japan t. yamaguchi department of civil and environmental engineering, nagaoka university of technology, niigata 940-2188, japan y. ebie

a combination of an acidification reactor and an up-flow staged sludge bed (ussb) reactor wasapplied to treatment of molasses wastewater. the ussb, equipped with three gas solid separators, wasselected because of superior organic removal by means of good retention of granular sludge. the combinedsystem was continuously operated at mesophilic (35°c) conditions for 600 days. the ussb achieved a h...

In this work, the performance of organic pollutant removal, membrane fouling and sludge morphology in a submerged membrane bioreactor (MBR) treating sunflower oil refinery wastewater (SORW) containing high oleic content was studied during 52 days’ operation at short values of 18 h and 10 days for hydraulic retention time and sludge retention time, respectively. The removal efficiencies of chemi...

Journal: :محیط شناسی 0
روح اله حسین لو دانش آموختة کارشناسی ارشد مهندسی عمران-محیط زیست، دانشگاه صنعتی اصفهان امیر تائبی - استاد دانشکدة مهندسی عمران، دانشگاه صنعتی اصفهان

the activated sludge process is the most used biological wastewater treatment method in the world. sludge bulking is one of the most common problems relateing to activated sludge wastewater treatment, and this fact causes poor settling in secondary sedimentation tank. sludge volume index(svi) and the zone settling velocity(zsv) are parameters to quantify the settleability of activated sludge . ...

Journal: :iranian journal of public health 0
gh ghanizadeh r sarrafpour

the effluent quality of a sewage treatment plant using activated sludge process and finally secondary treatment depends on the flocculation efficiency and settling of the flocs. the survey of various treatment processes in water and wastewater treatment shows that temperature and ph are the important factors affecting efficiency of flocculation and settling properties. this study was performed ...

2016
Yiqi Liu Jianhua Guo Qilin Wang Daoping Huang

Activated sludge process has been widely adopted to remove pollutants in wastewater treatment plants (WWTPs). However, stable operation of activated sludge process is often compromised by the occurrence of filamentous bulking. The aim of this study is to build a proper model for timely diagnosis and prediction of filamentous sludge bulking in an activated sludge process. This study developed a ...

Journal: :Bioresource technology 2013
Chunguang Liu Zhongfang Lei Yingnan Yang Haifeng Wang Zhenya Zhang

In this study, photocatalysis was used to improve the dewaterability and settleability of waste activated sludge (WAS) by a solar photocatalytic reactor with transparent Ag/TiO2 film as photocatalyst. Specific resistance of filtration (SRF) and sludge volume index (SVI) were used to evaluate WAS dewaterability and settleability, respectively, and the mechanism of photocatalysis was interpreted ...

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