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The Research on Characterize and Measure for Surface Activity of the Urban Sewage-Sludge and Application in Coal Sewage-Sludge Mixture

Author: FangRenJun
Tutor: SongXinNan
School: Jiangsu University
Course: Thermal Power Engineering
Keywords: sludge surface activity bio-surfactants surface tension ζ-potential emulsion capacity
CLC: X703
Type: Master's thesis
Year: 2009
Downloads: 175
Quote: 0
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Abstract


In recent years,with the increased of the urban treatment capacity,the reasonable disposal of sewage sludge became the urgent problem.The thought of the utilization of sludge was gaining more and more attention because it was in line with the strategy of sustainable development.This research re-examine the characteristics of sewage sludge,recognizing that sludge was surfactant with the existence of bio-surfactants.If the surface activity of sludge could be reasonable regulated and used,it will build another way for utilization of the sludge.In this study,waste-activated sludge was planted under laboratory condition. Study on the effect to the characteristics of sludge by the culture time and culture conditions.Research the relations between characteristics of the sludge and bio-surfactant production from sludge.The multiplication of bacteria came through four stages in the culturing sludge during the experimental process.The study obtained the most suitable culture conditions for bacterial growth in the sludge and found that bio-surfactants formation lags behind the growth of bacteria,which changed correspond to the transformation of bacteria number.It provided the basis to accommodate surfactant of the sludge.In order to investigate the change rule of the surface activity of sludge with the sludge characteristics,some factors were chose as the characterization for surface activity of the sludge according to the theory and analysis,as well as the relationship between the activity factor was found.The result of experiment showed there is exponential relationship between with the surface tension of the sludge and the concentration of bio-surfactants,theζ-potential of sludge and its emulsion capacity was linearly related with each other,both of which changed disciplinarian with the culture time of sludge.In the best culture condition,the sludge achieved the best surface activity which had a minimum value of surface tension,highest absolute value of theζ-potential,good emulsifying ability.The surface activity of sludge was used in technology of coal sewage-sludge mixture,researched on the characteristic of mixture under the laboratory condition. The result of experiment showed that the surface activity of sewage sludge has a significant impact on the characteristic of coal sewage-sludge mixture.Eximious surface active of sludge could increase the prime concentration of coal sewage-sludge mixture,at the same time the mixture had a better fluid of and stability.In this paper,through the research on token and measure for surface activity of the urban sludge and application in coal sewage-sludge mixture,it provides a theoretical and practical basis for reasonable regulation and use with the surfactants of sludge.It also provides a valuable reference for in-depth study in the future.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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