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Physico-Chemical Pre-Treatment for Drinking Water Sdosooo28

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Physico-Chemical Pre-Treatment for Drinking Water Sdosooo28 PHYSICO-CHEMICAL PRE-TREATMENT FOR DRINKING WATER SDOSOOO28 A Thesis Submitted In Fullfillment Of The Requirement For The Degree Of Doctor Of Philosophy In Chemistry By Wissal Ahmed Mahmoud Hassanien B.Sc. & Ed. Chemistry, U of K M.Sc. Chemistry, U of K Department of Chemistry Faculty of Education University of Khartoum August 2004 r-1 °- * > > ° O s 0 c 0 JJ>TJ A f f „ o DEDICATION To my Father and mother with love and respect To my Brothers and sisters ACKNOWLEDGEMENTS I would like to express my sincere thanks and deep gratitude to Professor Mohmed Ali Hussien for his supervision, indispensable help. My thanks also to Dr. Ibrahim Mohmed Ahmed for his supervision, encouragement, and invaluable advice throughout this work. Special thanks are due to Central Laboratory staff, Almogran, Khartoum State Water Corporation, for providing facilities Thanks are extended to Dr. Mubarak Dirar, Physics department, University of Sudan for Technology and Science, for laboratory facilities Thanks are also extended to the Microbiology Lab staff, Sudanese Standards and Metrology Organization, especially Professor Mona Alajab for their valuable collaboration in the bacteriological field. Thanks to Abd Alrazig Mohmed Abd Albagi, physics department, University of Khartoum for his help and advice in experimental design. My thanks also are due to the sustained encouragement of my family. To all who contributed, in a way or another, towards the completion of this work lam greatly indebted. Abstract The objective of this work is to attempt to improve the quality of town water by application of alternating current, direct current and magnetic field to raw water as pre-treatment to enhance the coagulation and flocculation. The research focuses particularly on development in water treatment processes. The design and operation for these processes and the evaluation thereof have been mentioned. Treatment generally requires application of electric current AC or DC (0.1- 1.0A) for residence current time 2-12 minutes, or application of magnetic field (20 -400 mT). The measurement of turbidity of raw water before and after treatment was done to obtain the efficiency of turbidity removal. Total suspended solids (TSS) of raw water were determined before and after treatment to obtain the efficiency of TSS removal. Total bacteria count was determined using standard plate count method. Most probable number (MPN) technique was used to determine the number of coliform organisms that were present in water to obtain the efficiency of water purification. Electric susceptibility was determined for raw water and water treated by magnetic field and by electric current to show the effect of these parameter on polarization which in turn affect the stability of colloids. The results obtain revealed that treatment by AC electric current gave turbidity removal efficiency in the range 40-81%, and TSS in the range 37-61%. Treatment by DC electric current gave turbidity removal efficiency in the range 17-76 % and TSS 9-57 %. Coagulation of natural colloids and other material suspended in water is faster in water impacted by an electric current. When alum and polymer was used as coagulant together with AC electric current, clarification rate was greater by 1.8-2.4 times in Damira 2001; 1.5- 3.3 times by poly aluminum chloride together with AC electric current; 2.4-4.5 times by alum and poly diallyl dimethyl ammonium chloride together with DC electric current in Damira 2002 . The effect of the magnetic field on the removal of both turbidity and total suspended solids does not follow a regular pattern. Whereas coagulation is faster in water impacted by magnetic field together with alum and polymer, clarification rate was greater 1.5- 4.8 times than in the absence of the field. in Electric currents have been shown to be capable of disinfecting drinking water and reducing the numbers of bacteria in the raw water. The mortality efficiency of total bacteria count was 57-83% and of total coliform was 58-93% when exposed to electric current for an extended residence current times between 2 to 11 minutes. The mortality efficiency of total bacteria count was 60-85%, and of total coliform was 53-95% when exposed to current between 0.16-0.60A at constant current time. The results obtained from physical and chemical analysis of raw water and water treated by AC, DC electric curreni and magnetic field revealed that there was small changes in pH, total dissolved solids, conductivity and temperature of water after treatment, whereas turbidity, total suspended solids, and hardness of water were decreased after treatment. Chemical analysis of separated water sludge revealed that the quantity of SiO., by mass percent was higher in sample treated by electric current due to precipitation of soluble silica and decomposition of carbonates. Analysis for the elements of the separated water sludge by Atomic Absorption Spectroscopy revealed that the concentration of the elements was reduced due to decomposition of the sludge complexes by electric effect. Analysis of the separated water sludge by XRD, indicated that, there was no significant change in the structure of the clay mineral before and after treatment by AC, DC electric current. Measurement of the electric susceptibility of magnetized water is directly proportional to the intensity of the applied magnetic field. The electric susceptibility of electrified water was decreased upon increasing electric current due to the increase in the number of paraelectric particles that align themselves in the direction of the field and thus decreases the electric susceptibility. IV 44>) A+c&aJl .(^Luu ^ 400-20) t<?-aUii- Jl^. .AjjljjiJ! SJLJI iliUi 40 (j^JI ^ sjl£*JI yi jl ;«:US J .lijUl ^WJ^11 ^JUJI U .%61-37 ti^JI ^ AJKII ^ULJ U^l\ AJA tt\j\ '^liSj t% 81- s.i.^ti ji^ji 4j|j| s^uSj 4 %76-17 CJAJI ^ ijl£*JI <ll j UUS ol .%57-9 < .(2001 ij^S) %2.4-1.8 <+** AJJ ,«-• f.jjijJ)l\ JJJJK ii»l»j ^IU-a]l «.U1! JJJjlll JJI ^lij L_uiJLi jJUJI frU] ij* 4.5-2.4 V-ij Ajjy L«S ij* 3.3-1.5 .(2002 -.j^)^iL*ll ^>ft£ll jLull V r-j^ ^ V < *-« 6Jjl Jj hj L&ilJ J\ %83-57 OH Cjljx. l JL SAJ ^WJ^ J^ V^ ^ %93-58 ow Ajj i %85- 60 u« c j\ Ju IJJSSJI ^iSlI JAJI ^J- UUS U .<1JSJ 11 -2 0.6-0.16 OJJ CJljy ^L.j^ jUU W^>i Jic %95-53 OJJ iJ KK-.1I ^S J *UI t> Jj.niJ l#iJUl i_i«ljll ^U^l JJ^ V <ii j^ 4ju.,ill AjciVl ^jja. jU>J (^jJall sJ—'jl' J.'^' jL^aij ^11 ^JJ^J LA- JLa-JI aLajl ^4 Lu VI Contents Particulars Page No. Chapter One : Introduction .1 The Characteristics of Water (1) .2 Physical Characteristics of Water (1) .3 Chemical Characteristics of Water (2) .4 Biological Characteristics of Water (3) .5 Water Quality (6) .6 Bacteriological Water Quality (9) .7 Water Treatment (11) .8 Electrical Water Treatment (13) .9 Magnetic Water Treatment (17) .10 Chemical Water Treatment (20) .11 Biological Water Treatment (28) .12 Water Disinfection (29) The Objectives (32) Chapter Two: Experimental 2.1 Samples Collection (33) 2.2 Materials and Instrumentation (33) 2.3 Electrical Treatment of Water Using AC /Damira 2001 (34) 2.4 Effect of Electrical Treatment on Hardness of Water (35) 2.5 Effect of Electrical Treatment on Water Temperature, (35) Conductivity, and Total Dissolved Solids. 2.6 Effect of Electrical Current AC on Water Coagulation/ (36) Damira 2001. 2.7 Effect of Alum Addition on Raw Water Turbidity (36) 2.8 Electrical Treatment Using 0.35A/ Damira 2002 (37) 2.9 Effect of Electrical Current on Water Coagulation/ (37) Damira 2002 2.10 Electrical Water Treatment Using DC Electric Current (37) 2.11 Effect of Electric Current DC on Water Coagulation (38) 2.12 Magnetic Water Treatment (general procedure) (39) 2.13 Variation of Turbidity Against Magnetic Field and (40) Precipitation Times 2.14 Effect of Electric Current on The Mortality of Bacteria in (40) Raw Water 2.15 Physical and Chemical Analysis of Raw and Treated Water. (43) vii 2.16 Chemical Analysis of The Separated Water Sludge Before (43) and After Treatment by Electric Current. 2.17 Determination of Electric Susceptibility of Raw and (46) Treated Water By Magnetic Field. 2.18 Determination of Electric Susceptibility of Raw and (46) Treated Water By Electric Current. Chapter Three : Results and Discussion - Water Turbidity, Total Suspended Solids When Applying (47) Various AC/ Damira 2001. - Water Turbidity for Current Duration 5 Minutes (50) - Effect of Electric Current on Water Hardness (57) - Effect of Electric Current on Conductivity and TDS (57) - Effect of Polymer and Alum Together with AC on Turbidity (58) Removal /Damira 2001 - Effect of Alum on Water Turbidity (61) - Water Turbidity, TSS, When Applying Various (62) AC / Damira 2002 - Water Turbidity, TSS, for Current Duration 3and 4 minutes. (69) - Effect of Polymer and Alum Together with AC on Turbidity (72) Removal Damira 2002 - Water Turbidity, TSS, When Applying Various DC/ Damira (76) 2002 - Water Turbidity, TSS for Current Duration 3.4, and 5 minutes. (84) - Effect of Polymer and Alum Together with DC on Turbidity (89) Removal. - Water Turbidity, TSS When Applying Magnetic Field of (92) Varying Strength. - The Effect of Magnetic Field on Conductivity and TDS. (95) - Variation of Turbidity Against Magnetic Field and (100) Precipitation Times. - The Effect of Electric Current on The Mortality of Bacteria. (101) - The Effect of Residence Current Time on The Mortality of (120) Bacteria. - Kinetic With Respect to Bacteria. (125) - Physical and Chemical Analysis of Water. (136) - Chemical Analysis of Separated Water Sludge by Atomic (137) Absorption.
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