

@mastersthesis {6574,
	title = {Engineering {Application} {Study} of {Treating} {Refining} {Wastewater} by {Microfiltration} and {Reverse} {Osmosis}},
	year = {2007},
	note = {H457321},
	school = {South China University of Technology (People{\textquoteright}s Republic of China)},
	type = {phdM.{S}.},
	address = {Ann Arbor},
	abstract = {Abstract With the development of society and the heightenning of people{\textquoteright}s demand for water , the industrial wastewater discharge and domestic sewage discharge of our country is larger and larger .Clean production must be treasured and its discharge has be decreased and its reuse must be considered strictly.The general treatment methods of wastewater reuse are introduced and the current research on membrance separation technology for oily wastewater treatment such as micro-filtration(MF) ,ultra- filtration(UF) ,reverse osmosis(RO) and combined membrance treatment process. The experiments of treating the oily wastewater from Guangzhou Petrochemical Company by micro-filtration and reverse osmosis process were carried out. Its outlet water has used to circulating coling water .The results indicate that the outlet water quality has reached the standard of sewage reuse for circulating coling water . The continuned micro-filtration process can remove oil , COD andturbidity The average removal rate of oil reachs 60\%{\textasciitilde}90\% , the average removal rate of COD reachs 40\%{\textasciitilde}70\%. The mass concentration of oil in treated water is reduced to 1mg/L , the mass concentration of ammonia nitrogen is dropped and less than 1mg/L , the COD is less than 25mg/L . And the quality of water which was also treated by reverse osmosis can meet the quality standards of drinkwater under normal state . The results show that circulating coling water quality is in the control,but corrosion rate ascend , inhibitor rate descend. Membrane fouling is a critical factor impacting on the micro-filtration and reverse osmosis system running , membrane fouling results in the permeate flux falling and reduces the productivity of micro-filtration and reverse osmosis system . Pretreatment is very important for controlling membrane fouling . walnut shell filter is use to eliminate the suspended solid and oil in the wastewater , the average removal rate of oil more than 50\% .If the operation conditions such as washing interval and washing period are fixd on in reason , the productivity of water can be improved . In this study , the reasonable operation conditions are washing interval 30minutes ; wash period difference with inlet water quality have more better effect . This text interchange germicide of 200mg/L NaClO and germicide of 200mg/L H2O2 created satisfactory results .It introduces the difference of scale inhibition ability and effect of scale inhibitor dosage on scale inhibion rate .when water washing can not restore the permeat flux , permeate flux falling remarkable or trans membrance pressure difference increase to certain value , chemical cleaning can restore the permeate flux effectively . The article expounds the difference cleaning efficiency of fouling membrane by the three chemical cleaning agent . In the text , 300mg/LNaOH and 300mg/LNaClO is useed as chemical cleaning agent for micro-filtration . The results showed that the cleaning efficiency is 98 \% . The operation cost is the main limitation which membrane applies to practice in scale . It mainly includes energy and membrane replacement cost .},
	keywords = {(UMI)AAIH457321, 9998:No UMI subject assigned, No UMI subject assigned, Social sciences},
	url = {http://search.proquest.com/docview/1027107182?accountid=14270},
	author = {Wu, Hui Jun}
}
