Determine the Moisture Distribution in Sewage Sludge by Drying Differential

2014 ◽  
Vol 665 ◽  
pp. 404-407 ◽  
Author(s):  
Wan Yu ◽  
Pei Sheng Li
Keyword(s):  
Sewage Sludge ◽  
Interstitial Water ◽  
Bound Water ◽  
Free Water ◽  
High Accuracy ◽  
Moisture Distribution ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Hot Air ◽  
Critical Water Content

Moisture distribution in sewage sludge was considered as the essential of thermal drying. Some methods were given in literatures to test the moisture distribution, but there was no standard method to determine the critical water content between different kinds of water. The municipal sewage sludge was dried by hot air in this work. Based on the drying curve, the derivative of drying rate with respect to dry basis moisture content was brought out to analyze the moisture distribution in sewage sludge. Results show that this method can easily determine the free water, interstitial water, surface water and bound water with a high accuracy. The present work can provide new insight to determine the moisture distribution in sewage sludge, which was still lacking in the literatures.

Comparative Analysis of the Measurement Methods of Bound Water Content in Municipal Sewage Sludge

2012 ◽  
Vol 518-523 ◽  
pp. 2991-2995
Author(s):  
Wei Jun Zhang ◽  
Ke Chun Sun
Keyword(s):  
Comparative Analysis ◽  
Sewage Sludge ◽  
Water Content ◽  
Bound Water ◽  
Measurement Methods ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Sludge Dewatering ◽  
Advantages And Disadvantages ◽  
Bound Water Content

The dewatering of municipal sewage sludge is a current problem due to the huge production of this waste. The bound water content in sludge is closely related to the sludge dewatering performance. By comparative analysis of the measurement methods of the bound water content in sludge, this article points out their respective advantages and disadvantages, as well as the respects which should be noted in practice.

Experimental Study on Hydrothermal Treatment of Municipal Sewage Sludge

2013 ◽  
Vol 448-453 ◽  
pp. 693-698 ◽  
Author(s):  
Li Li Qian ◽  
Shu Zhong Wang ◽  
Xing Ying Tang
Keyword(s):  
Sewage Sludge ◽  
Moisture Content ◽  
Hydrothermal Treatment ◽  
Initial Moisture Content ◽  
Bound Water ◽  
High Energy ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Gravimetric Analysis ◽  
Combustion Performance

Wastewater treatment plants produced large amounts of municipal dewatered sewage sludge with about 80wt% moisture content. High moisture content is the bottleneck of sludge treatment and disposal. Hydrothermal treatment could economically disrupt sludge cells, release bound water and finally improve sludge dewaterability instead of thermal drying technology with high energy consumption. In this paper, hydrothermal treatment experiments were carried out and the combustion performance of the original sewage sludge and the hydrothermal treatment sewage sludge was analyzed to verify the possibility of burning after sludge hydrothermal treatment. The results show that the optimal reaction temperature, initial moisture content, pressure and time are 170°C, 87wt%, 0.9MPa and 40min, respectively, obtaining a final moisture content lower than 50wt% by centrifugation. Total Organic Carbon (TOC) results show that higher temperature and pressure, as well as longer reaction time are of benefit to the hydrothermal treatment of the municipal sewage sludge. Furthermore, Thermal Gravimetric Analysis (TGA) of the original sewage sludge and the hydrothermal treatment sewage sludge shows that a hydrothermal treatment can improve the combustion performance of the sludge, which is beneficial to the subsequent incineration process.

A long-term chemical and infrared spectroscopy study on a soil amended with municipal sewage sludge

Agronomie ◽  
2001 ◽  
Vol 21 (2) ◽  
pp. 169-178 ◽  
Author(s):  
Giovanni Gigliotti ◽  
Pier Lodovico Giusquiani ◽  
Daniela Businelli
Keyword(s):  
Infrared Spectroscopy ◽  
Sewage Sludge ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Spectroscopy Study
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