Sludge dewatering using centrifuge with thermal/polymer conditioning

2001 ◽  
Vol 44 (10) ◽  
pp. 321-325 ◽  
Author(s):  
C.F. Lin ◽  
Y. Shien
Keyword(s):  
Water Treatment ◽  
Thermal Treatment ◽  
Specific Resistance ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Sludge Dewatering ◽  
Capillary Suction ◽  
Temperature Changes ◽  
Biological Sludge ◽  
Sludge Particle

Sludge dewatering is preceded by a conditioning operation to enhance water removal efficiency. In the conditioning operation, chemical coagulants or polymers are added to promote sludge particle aggregation for easier dewatering. In this study, an alternative conditioning method for sludge thermal treatment at temperatures up to 80°C was extensively investigated. Dewatering characteristics such as sludge capillary suction time and specific resistance to filtration, sludge viscosity and concentration of solid cakes were examined thoroughly. A good correlation between capillary suction time and specific resistance to filtration was established for sludges from water treatment, but not for biological sludge. Cationic polymer exhibits the best enhancement on sludge moisture removal. The sludge rheogram varies from 60 to 5 cP as temperature changes from 20 to 80°C for sludges from water treatment plant. The dewatering ability of sludge can be greatly enhanced by thermal treatment in conjunction with the use of polymers.

Comparison of lime and alum as oily sludge conditioners

1997 ◽  
Vol 36 (12) ◽  
pp. 117-124 ◽  
Author(s):  
Tay Joo Hwa ◽  
S. Jeyaseelan
Keyword(s):  
Specific Resistance ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Oily Sludge ◽  
Sludge Dewatering ◽  
Capillary Suction ◽  
Sludge Cake ◽  
Solids Content ◽  
Optimum Chemical

Chemical conditioning improves sludge dewatering. Choice of chemical conditioners is very much dependent on the characteristics of the sludges and the type of dewatering devices. Lime, alum, ferric chloride and polyelectrolytes are commonly used chemical conditioners. Anaerobic digested sludge samples collected from a sewage treatment plant with different oil contents varying from 1.8% to 8.0% by weight have been examined in the laboratory to find out their specific resistance, capillary suction time and filter yield. Lime and alum were used separately as conditioners. Different dosages of conditioner varying from 2% to 12% by weight were used to determine the optimum chemical dosage for varying oil contents. Lime dosages of about 6% were found to yield favourable characteristics. Addition of alum decreases the specific resistances and capillary suction times of oily sludges rapidly up to 4% dosages. Alum dosages beyond 4% only increase the solids content in the sludge cake and increase the sludge volume to be handled. A correlation between CST and specific resistance to filtration was established. CST can be measured easily and quickly in the laboratories. Using the CST and the correlation a quick prediction on dewaterability can be established.

Effect of adding alum sludge from water treatment plant on sewage sludge dewatering

2016 ◽  
Vol 4 (1) ◽  
pp. 746-752 ◽  
Author(s):  
Jun Li ◽  
Liu Liu ◽  
Jun Liu ◽  
Ting Ma ◽  
Ailan Yan ◽  
...  
Keyword(s):  
Water Treatment ◽  
Sewage Sludge ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Sludge Dewatering ◽  
Alum Sludge

scholarly journals Characteristics of water sludge from Cracow Water Treatment Plants – case study

2019 ◽  
Vol 100 ◽  
pp. 00019 ◽  
Author(s):  
Renata Gmurkowska
Keyword(s):  
Water Treatment ◽  
Organic Compounds ◽  
Dry Matter ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Dry Mass ◽  
Capillary Suction ◽  
Factors Affecting ◽  
Experimental Part ◽  
Water Treatment Plants

During water treatment a large amount of sludge is created – in the form of sewage and sediments. The largest amounts of sludge are produced during coagulation, ozonation and backwashing rapid filters. The quality and quantity of treated water, the type and dose of used coagulants are factors affecting the quantity, composition and properties of the sludge. Sludge produced during processing of drinking water is important problem and their quantity has been increasing. The study focuses on characteristics of water treatment sludge from four water treatment plants in Cracow. It includes theoretical and experimental part. The first part is based on analysis of literature and information obtained from MPWiK [3]. The second experimental part, concerns the analysis of dry matter, organic dry matter, capillary suction time and visual parameters: the color and consistency of the sludge. Result shows that every sludge contains organic matter. The highest concentrations of organic compounds and the largest diversity has been observed in the sludge collected in the Water Treatment Plant Raba, reaching even up to 70% of organic compounds in the dry mass of sludge.

scholarly journals Geotextile Tube Dewatering Performance Assessment: An Experimental Study of Sludge Dewatering Generated at a Water Treatment Plant

2020 ◽  
Vol 12 (19) ◽  
pp. 8129
Author(s):  
Maria Alejandra Aparicio Ardila ◽  
Samira Tessarolli de Souza ◽  
Jefferson Lins da Silva ◽  
Clever Aparecido Valentin ◽  
Angela Di Bernardo Dantas
Keyword(s):  
Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Water Bodies ◽  
Performance Tests ◽  
Sludge Dewatering ◽  
Geotextile Tube ◽  
Dependent Variables ◽  
Different Types ◽  
Economical Alternative

Using geotextile tubes as dewatering technology may significantly contribute to sustainable treatment of sludge generated in different industries, such as the water industry. This is an economical alternative for dewatering sludge from a Water Treatment Plant (WTP), which prevents sludge from being directly deposited in water bodies and makes it possible to then transfer the sludge to landfills. This paper presents a laboratory study and a statistical analysis, carried out to evaluate the geotextile tube dewatering of sludge from a WTP, discussing the relation between the independent variables (initial Total Solids (TS) of the sludge and polymer dosing) and dependent variables (performance indices used in the literature) evaluated using semi-performance tests. Sludge from a WTP and three different types of geotextiles bags were used. Changes in the geotextiles’ characteristics after dewatering were also evaluated, quantitatively using permittivity tests and qualitatively by Scanning Electron Microscopy (SEM). The results indicated turbidity of effluent that met the Brazilian regulations for the discharge of effluents into Class 2 water bodies, as well as higher percent-solids than those obtained with mechanical dewatering technologies. This study underscores the importance of semi-performance tests to understand dewatering in geotextile tubes.

Characterization and treatment of lime sludge dewatering effluents

1992 ◽  
Vol 19 (5) ◽  
pp. 794-805 ◽  
Author(s):  
H. Zhou ◽  
D. W. Smith ◽  
S. J. Stanley
Keyword(s):  
Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Organic Content ◽  
Management Options ◽  
Sludge Dewatering ◽  
Bench Scale ◽  
Regulatory Constraints ◽  
Lime Sludge ◽  
Large Water

With ever increasing regulatory constraints on the disposal of residuals produced during water treatment, the cost of handling, treatment, transport, and disposal of these residuals has become a significant portion of overall water treatment costs. In plants practicing lime softening, a major source of residuals is lime sludge. Of the many options proposed for the management of lime sludges most include sludge dewatering. The dewatering process produces effluents that also must be disposed of. This paper presents the results of the characterization of dewatering effluents from a large water treatment plant. Also presented are treatment and management options which were evaluated through designed bench-scale experiements.The quality and quantity of supernatant effluents from the thickener and centrate from the centrifuge were determined. It was found that the supernatant is composed predominantly of calcium ions and caustic alkalinity which can be treated through pH adjustment. The centrate was found to be of much poorer quality with poor settling and filterability properties. These qualities were found to be mostly attributed to the high organic content of the centrate. Bench-scale tests found that polymer pretreatment could substantially improve both the settleability and filterability of the centrate. Key words: water treatment, sludge dewatering, softening, polymers, sludge conditioning.

Heat-killing of Legionella in biological sludge from a paper and pulp mill water treatment plant

2015 ◽  
Vol 30 (1) ◽  
pp. 121-125 ◽  
Author(s):  
Alberto Melo Filho ◽  
Stina Drotz ◽  
Daniel Ragnvaldsson ◽  
Christer Larsson ◽  
Chia-Jung Tsai
Keyword(s):  
Water Treatment ◽  
Treatment Plant ◽  
Pulp Mill ◽  
Water Treatment Plant ◽  
Biological Sludge ◽  
Paper And Pulp

DESIGNING OF REMOTE TERMINAL UNIT (RTU) FOR MEASUREMENT OF pH IN WATER TREATMENT PLANT

2019 ◽  
Vol 10 (1) ◽  
pp. 16
Author(s):  
V. MANE-DESHMUKH PRASHANT ◽  
B. MORE ASHWINI ◽  
B. P. LADGAOKAR ◽  
S. K. TILEKAR ◽  
◽  
...  
Keyword(s):  
Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Terminal Unit ◽  
Remote Terminal ◽  
Remote Terminal Unit

ENHANCED COAGULATION FOR ALGAE REMOVAL IN A TYPICAL ALGERIA WATER TREATMENT PLANT

2017 ◽  
Vol 16 (10) ◽  
pp. 2303-2315 ◽  
Author(s):  
Djamel Ghernaout ◽  
Abdelmalek Badis ◽  
Ghania Braikia ◽  
Nadjet Mataam ◽  
Moussa Fekhar ◽  
...  
Keyword(s):  
Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Enhanced Coagulation ◽  
Algae Removal
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