Analysis of wastewater sludge drying process in vacuum filters

Considerable increases in industrial and urban wastewater sludge generation in recent years require proper treatment, such as thermal drying, and disposal. The sludge drying is a complex process involving simultaneous and coupled heat and mass transfer, which can be modeled by taking into account mass and heat balances, and assuming that water diffuses according to kinetic laws. This research implemented a simulation model for biosludge drying processes to predict the temperature and moisture distribution inside the biosludge, using the COMSOL Multiphysics® simulation program v5.2. A parametric analysis was carried out to determine the effect of initial moisture content on biosludge final temperature and moisture reduction. The simulated temperature and moisture content were experimentally validated and good agreement was observed between the simulation and experimental results. This model is a useful tool to optimize the drying process and develop better strategies for the control of the system.

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Drying characteristics of wastewater sludge according to outside air inflow conditions

Proceedings of 21th International Drying Symposium ◽

10.4995/ids2018.2018.7790 ◽

2018 ◽

Author(s):

Sang Hyun Oh ◽

Ki Ho Park ◽

Byoung Hyuk Yu ◽

Sung Il Kim

Keyword(s):

Thin Film ◽

Sewage Sludge ◽

Wastewater Sludge ◽

Drying Process ◽

Drying Characteristics ◽

Inflow Condition ◽

Materials Used ◽

Sludge Drying ◽

Drying Efficiency ◽

Inflow Conditions

The purpose of this study is to analyze the changes of drying efficiency according to the inflow conditions of outside air into the drying equipment during the drying process in order to reduce the energy used in the drying process of sludge. We conducted the experiment using a vertical thin film dryer. Materials used for the experiment are sewage sludge. As a result of the study, higher drying efficiency was obtained in the case of outside air inflow than in the case of no outside air inflow. In addition, optimum condition of outside air inflow was derived. Keywords: Drying; Sludge; Drying efficiency; Air inflow condition

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Review on Sludge Drying Process and Dryer in Solar Energy

American Journal of Energy Engineering ◽

10.11648/j.ajee.20170505.12 ◽

2017 ◽

Vol 5 (5) ◽

pp. 34

Author(s):

Xiaojuan An

Keyword(s):

Solar Energy ◽

Drying Process ◽

Sludge Drying

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A geothermal energy system for wastewater sludge drying and electricity production in a small island

Energy ◽

10.1016/j.energy.2018.08.062 ◽

2018 ◽

Vol 163 ◽

pp. 130-143 ◽

Cited By ~ 12

Author(s):

F. Calise ◽

S. Di Fraia ◽

A. Macaluso ◽

N. Massarotti ◽

L. Vanoli

Keyword(s):

Geothermal Energy ◽

Energy System ◽

Wastewater Sludge ◽

Electricity Production ◽

Small Island ◽

Sludge Drying

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Effectiveness of Wastewater Sludge Treatment Processes to Inactivate Parasites

Water Science & Technology ◽

10.2166/wst.1986.0314 ◽

1986 ◽

Vol 18 (7-8) ◽

pp. 397-404 ◽

Cited By ~ 3

Author(s):

R. S. Reimers ◽

D. B. McDonell ◽

M. D. Little ◽

D. D. Bowman ◽

A. J. Englande ◽

...

Keyword(s):

Heat Treatment ◽

The United States ◽

Wastewater Sludge ◽

Sludge Treatment ◽

Treatment Processes ◽

Sludge Digestion ◽

Thermophilic Digestion ◽

Sludge Drying ◽

Aerobic And Anaerobic ◽

Trichuris Vulpis

In the United States, Ascaris spp., Trichuris trichiura, Trichuris vulpis and Toxocara spp. are the most commonly found viable parasites in both treated and untreated municipal sludges. As expected, heat treatment, thermophilic digestion (aerobic and anaerobic) and thermophilic composting were effective in parasite inactivation, and with good sludge digestion (both aerobic and anaerobic), the effectiveness of sludge lagoon storage and sludge drying beds to inactivate parasites and pathogens is greatly enhanced. At present two commercial sludge processes, Chemfixation and Ozonics treatment have shown potential to inactivate parasites.

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Masking agent efficiency on odor removal from WWTP sludge drying process

Water Practice & Technology ◽

10.2166/wpt.2018.017 ◽

2018 ◽

Author(s):

F. Rousseille ◽

A. Ventura

Keyword(s):

Control Unit ◽

Drying Process ◽

Odor Control ◽

Odor Concentration ◽

Odor Removal ◽

Masking Agents ◽

Last Stage ◽

Foul Odor ◽

Sludge Drying ◽

Dynamic Olfactometry

Abstract A study was executed in 2016 to determine the efficiency of two different neutralizers on odor perception from a sludge drying process. One of the products was injected by fogging system at the inlet of the odor control unit while the other was added directly to the washing solution of the last stage of the odor control unit, according to supplier recommendations. Performance evaluations encompassed complementary approaches including both sensorial analyses and analytical measures. Odor analyses were performed via dynamic olfactometry according to European Standard EN 13725 coupled with hedonic tone approach according to VDI 3882. Additional analyses on VOC emissions were conducted using gas chromatography screening. In parallel, several odor panels composed of site operators and plant neighbors carried out observations on the WWTP and its perimeter. The main conclusions of this study illustrates: • Only one test leads to a reduction of the odor concentration at the stack, • Overall, neither of the two masking agents significantly reduce the odor concentration at the stack, • The addition of masking agent seems to increase foul odor persistency, • The local odor panel observed no significant improvement in odor reduction within the environment around the WWTP.

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