Determination of Specific Cake Resistance with a New Capillary Suction Time Apparatus

Herwijn, A.J.M.; Heij, E. J. La; Ijzermans, J. J.; Coumans, W.J.; Kerkhof, P.J.A.M.

doi:10.1021/ie00043a036

Cited by 10 publications

(29 citation statements)

References 3 publications

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“…5 A rectangular instead of a circular funnel allows for an easy mathematical treatment of CST data. Therefore, a further set of experiments was performed with a rectangular funnel (not supplied as part of the standard kit) of 18 × 18 × 20 mm 3 (width, length and height, respectively) replacing the circular funnel. The rectangular funnel volume of 6.48 cm 3 was similar to the 18 mm circular funnel.…”

Section: Materials and Methodology Cst Devices And Measurementsmentioning

confidence: 99%

“…Therefore, a further set of experiments was performed with a rectangular funnel (not supplied as part of the standard kit) of 18 × 18 × 20 mm 3 (width, length and height, respectively) replacing the circular funnel. The rectangular funnel volume of 6.48 cm 3 was similar to the 18 mm circular funnel. A rectangular funnel should principally be applicable for 'light' and 'heavy' sludges.…”

Section: Materials and Methodology Cst Devices And Measurementsmentioning

confidence: 99%

See 1 more Smart Citation

Revised capillary suction time (CST) test to reduce consumable costs and improve dewaterability interpretation

Scholz

2005

J of Chemical Tech & Biotech

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The aim of this paper is to critically assess the standard capillary suction time (CST) test and to propose a modified device (prototype) and a revised CST procedure. The empirical CST test (using a circular funnel) is well established as the leading method for the determination of sludge dewaterability in spite of its current shortcomings such as restricted modelling possibilities, and therefore the ability to predict physical processes such as the amount of water bound by the paper. Nevertheless, the CST apparatus is portable, and the method is easy to conduct, quick, cost-effective and accurate, if the product of solid concentration and average specific resistance to filtration is of interest. A novel prototype with a rectangular instead of a circular funnel incorporating a stirrer (optional), and using a cheaper paper with similar or improved characteristics is proposed to reduce consumable costs and improve dewaterability interpretation.

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Section: Materials and Methodology Cst Devices And Measurementsmentioning

confidence: 99%

Section: Materials and Methodology Cst Devices And Measurementsmentioning

confidence: 99%

Revised capillary suction time (CST) test to reduce consumable costs and improve dewaterability interpretation

Scholz

2005

J of Chemical Tech & Biotech

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“…Lee and Hsu (1994) proposed a method that allowed SRF to be calculated without the liquid invasion volume measurement using capillary suction apparatus. A similar work by Herwijn et al (1995) presented a newly developed model of CST apparatus able to determine specific cake resistances of both unflocculated and flocculated sludges. Sawalha and Scholz (2010) provided a mathematical model which related CST, SRF and other parameters, such as temperature and solids content.…”

Section: Relationship Between Cst and Srfmentioning

confidence: 99%

A review on sludge dewatering indices

Nguyễn

Vigneswaran

et al. 2016

Water Science and Technology

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Dewatering of sludge from sewage treatment plants is proving to be a significant challenge due to the large amounts of residual sludges generated annually. In recent years, research and development have focused on improving the dewatering process in order to reduce subsequent costs of sludge management and transport. To achieve this goal, it is necessary to establish reliable indices that reflect the efficiency of sludge dewatering. However, the evaluation of sludge dewaterability is not an easy task due to the highly complex nature of sewage sludge and variations in solid-liquid separation methods. Most traditional dewatering indices fail to predict the maximum cake solids content achievable during full-scale dewatering. This paper reviews the difficulties in assessing sludge dewatering performance, and the main techniques used to evaluate dewatering performance are compared and discussed in detail. Finally, the paper suggests a new dewatering index, namely the modified centrifugal index, which is demonstrated to be an appropriate indicator for estimating the final cake solids content as well as simulating the prototype dewatering process.

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“…It has been found that lower CST values are obtained among the sludge with lower solid content (Sarikaya and Al-Marshoud, 1993;Herwijn et al, 1995). There is a certain limit in the interpretation of CST since the CST is not an intensive property.…”

Section: Capillary Suction Time (Cst)mentioning

confidence: 99%