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.

Hydrothermal Treatment Technology of Municipal Sewage Sludge

2014 ◽  
Vol 908 ◽  
pp. 457-460 ◽  
Author(s):  
Li Li Qian ◽  
Shu Zhong Wang ◽  
Xing Ying Tang
Keyword(s):  
Sewage Sludge ◽  
Moisture Content ◽  
Hydrothermal Treatment ◽  
Wastewater Treatment Plants ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Treatment Technology ◽  
Drying Technology ◽  
Dewatered Sewage Sludge ◽  
Treatment And Disposal

In China, over 28 million tons of dewatered sewage sludge, with 80 wt% moisture content, was generated from wastewater treatment plants in 2011. High moisture content is the bottleneck of sludge treatment and disposal. Thermal drying technology can significantly reduce the moisture content of sludge but its cost is too high. Hydrothermal treatment technology based on cell-break principle can efficiently and economically reduce the moisture content of sludge. This paper will introduce the specific process, features, treatment effect of this technology and propose an economic evaluation. The results show that hydrothermal treatment technology is a reasonable and economical method for treating sewage sludge in cities.

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.

scholarly journals Experimental Study of Moisture Content Effect on Geotechnical Properties of Solidified Municipal Sludge

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Yijun Chen ◽  
Xingxing He ◽  
Ping Wang ◽  
Yong Wan ◽  
Xun Tan
Keyword(s):  
Moisture Content ◽  
Permeability Coefficient ◽  
Mercury Intrusion Porosimetry ◽  
Initial Moisture Content ◽  
Friction Angle ◽  
Geotechnical Properties ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Municipal Sludge ◽  
Mercury Intrusion

Moisture content is an important factor affecting the geotechnical properties of solidified municipal sludge (MMS). Typical municipal sludge in China was chosen to investigate the effects of initial moisture content (defined as w0) on geotechnical properties of MMS solidified by self-developed CERSM solidifying agent. In addition, the microstructure changes of solidified sludge samples in this study were explored with scanning electron microscopy and mercury intrusion porosimetry. Mechanical experiment results showed that the unconfined compressive strength, cohesion, and internal friction angle of the MMS increased with the decrease in initial moisture content, but the permeability coefficient changed oppositely. The permeability coefficient of solidified sludge samples was between 10−8 and 10−10 cm/s. But after the drying-saturated process, the permeability coefficient of MMS can be increased up to 4 times, mainly due to the formation of a considerable number of microconnected pores and microcracks in the process of drying. The research results are of great significance to the safe disposal and utilization of municipal sewage sludge in China.

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.

scholarly journals Municipal Sewage Sludge Drying Treatment by an Composite Modifier

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Na Wei
Keyword(s):  
Sewage Sludge ◽  
Moisture Content ◽  
Portland Cement ◽  
Uniform Design ◽  
Cement Clinker ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Curing Time ◽  
Material Content ◽  
Sludge Drying

A sludge composite modifier (SCM) which comprises a mixture of three cementitious components was proposed for sludge drying and stabilization. Effect of SCM components on sludge moisture content was analyzed using uniform design and the optimum composition of SCM was determined by computer-aided modeling and optimization. To compare the drying effect of SCM, quicklime, and Portland cement, the effects of material content and curing time on moisture content of sludge were also studied. The results showed that the optimum ratio of modifier component was slag/cement clinker/dihydrate gypsum = 0.64/0.292/0.068 and the moisture content of SCM-stabilized sludge decreased with the increasing material content and extending curing time. Besides, the experimental results showed that optimized SCM behaved better than quicklime and Portland cement in sludge semi-drying and XRD analysis revealed that the main hydrated product of stabilization was ettringite, which played an important role in the effective drying process. Sewage sludge stabilized using SCM could be used as an effective landfill cover.

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

scholarly journals Highly Effective Adsorption Process of Ni(II) Ions with the Use of Sewage Sludge Fly Ash Generated by Circulating Fluidized Bed Combustion (CFBC) Technology

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3106
Author(s):  
Tomasz Kalak ◽  
Kinga Marciszewicz ◽  
Joanna Piepiórka-Stepuk
Keyword(s):  
Fly Ash ◽  
Sewage Sludge ◽  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Fluidized Bed Combustion ◽  
Nickel Ions ◽  
Suitable Material ◽  
Circulating Fluidized Bed Combustion

Recently, more and more attention has been paid to the removal of nickel ions due to their negative effects on the environment and human health. In this research, fly ash obtained as a result of incineration of municipal sewage sludge with the use of circulating fluidized bed combustion (CFBC) technology was used to analyze the possibility of removing Ni(II) ions in adsorption processes. The properties of the material were determined using analytical methods, such as SEM-EDS, XRD, BET, BJH, thermogravimetry, zeta potential, SEM, and FT-IR. Several factors were analyzed, such as adsorbent dose, initial pH, initial concentration, and contact time. As a result of the conducted research, the maximum sorption efficiency was obtained at the level of 99.9%. The kinetics analysis and isotherms showed that the pseudo-second order equation model and the Freundlich isotherm model best suited this process. In conclusion, sewage sludge fly ash may be a suitable material for the effective removal of nickel from wastewater and the improvement of water quality. This research is in line with current trends in the concepts of circular economy and sustainable development.

Sign in / Sign up

Export Citation Format

Share Document