نتایج جستجو برای: Sludge

تعداد نتایج: 15931  

Journal: :Environmental technology 2004
A Léonard P Vandevenne T Salmon P Marchot M Crine

This paper deals with thermal drying of wastewater sludges, whose management will become crucial in the forthcoming years. Sludges collected after mechanical dewatering in 5 different WWTPs are submitted to the same convective drying treatment in order to try finding some relations between the drying behaviours, the type of effluent and wastewater treatments. Results show dearly sludge drying r...

Journal: :iranian journal of health sciences 0
mehdi ahmadi 2department of environmental health engineering, ahvaz jundishapur university of medical sciences, ahvaz, iran nikoo bayati department of environmental sciences, ahvaz science and research branch, islamic azad university, ahvaz, ali akbar babaei 2department of environmental health engineering, ahvaz jundishapur university of medical sciences, ahvaz, iran pari teymouri department of environmental health engineering, kurdistan university of medical sciences, sanandaj, iran

background and purpose: disposing sludge from industrial wastewater treatment plants (iwwtps) is a serious issue because it can affect human and animals health, and also environmental quality. in this study, sludge from an iwwtp was analyzed regarding its physicochemical characteristics and disposal options. materials and methods: grab sampling was used to collect 12 sludge samples biweekly (ma...

Journal: :Analytical and bioanalytical chemistry 2011
Gabriela A Vázquez-Rodríguez Rosa Icela Beltrán-Hernández Claudia Coronel-Olivares Jean-Luc Rols

Activated sludges are an inoculum source commonly used in biodegradation studies, as wastewater treatment facilities constitute an entry point to the environment for many chemicals. In this paper, the main issues relating to the use of activated sludge in biodegradability tests are presented. Special attention is also devoted to discussing the factors affecting both the activity of the microbia...

2009
M. Ghazy T. Dockhorn N. Dichtl

The present disposal routes of sewage sludge represent a critical environmental issue in Egypt. Recently, there has been an increasing concern about sewage sludge management due to the environmental risks, which resulted from the fast expansion of wastewater treatment plants without equal attention in dealing with the produced sludge. This paper discusses the current situation of sewage sludge ...

Journal: :Water science and technology : a journal of the International Association on Water Pollution Research 2001
G H Chen S Saby M Djafer H K Mo

This paper presents three new approaches to reduce excess sludge production in activated sludge systems: 1) modification of conventional activated sludge process with insertion of a sludge holding tank in the sludge return line; 2) chlorination of excess sludge so as to minimize excess sludge production; and 3) utilization of a metabolic uncoupler, 3, 3', 4', 5-Tetrachlorosalicylanilide (TCS) t...

Journal: :Bioresource technology 2014
Galilee U Semblante Faisal I Hai Huu H Ngo Wenshan Guo Sheng-Jie You William E Price Long D Nghiem

Alternate cycling of sludge in aerobic, anoxic, and anaerobic regimes is a promising strategy that can reduce the sludge yield of conventional activated sludge (CAS) by up to 50% with potentially lower capital and operating cost than physical- and/or chemical-based sludge minimisation techniques. The mechanisms responsible for reducing sludge yield include alterations to cellular metabolism and...

2006
Klas Svensson

The literature on reduction of excess sludge production by ozonation is summarized. Two sequencing batch reactor experiments where sludge is ozonated for this purpose are performed. The purpose of these is to evaluate the prospects of using ozonation to reduce excess sludge production in two different kinds of sludge. Urban sewage sludge is used in the first, and paper mill sludge in the second...

Journal: :Bioresource technology 2013
Saeid Baroutian Nicky Eshtiaghi Daniel J Gapes

The main objective of this study was to investigate the rheology of mixed primary and secondary sludge and its dependency on solid content and temperature. Results of this study showed that the temperature and solid concentration are critical parameters affecting the mixed sludge rheology. It was found that the yield stress increases with an increase in the sludge solid content and decreases wi...

2016
Wenda Tao Xu-Xiang Zhang Fuzheng Zhao Kailong Huang Haijun Ma Zhu Wang Lin Ye Hongqiang Ren

To understand the diversity and abundance of antibiotic resistance genes (ARGs) in pharmaceutical wastewater treatment bioreactors, the ARGs in sludge from two full-scale pharmaceutical wastewater treatment plants (PWWTPs) were investigated and compared with sludge samples from three sewage treatment plants (STPs) using metagenomic approach. The results showed that the ARG abundances in PWWTP s...

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