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Organic liners sealing of earthen reservoirs v 105 The seepage rates of all treatments were still The pH showed an initial increase above that of :clining after 83 days of experimentation. Linear the wastewater and soil of 8.0-8.2, thus indicating ;gression of the logarithmic value of the seepage active microbial activity. As of day 55, the pH drop- -tte was therefore used to extrapolate the results. ped from 8.5-8.7 to 7.98.3, probably because of the 'able 4 lists the regression equation obtained for cool ambient temperatures of about 1°C from day 45 ach treatment, as illustrated in Fig. 2. Thus, the to day 51. 1uation indicated that treatment 5 could have For all treaamdea1s10hto25seepage mg 1-'dropped from day 40, -ached the environmentally acceptable seepage rate 200 mg I- , y f 1 x 10-1 in s-t after 128 days. as a result of more organic particles being caught in the soil pores which had been diminished in size by )uality of the seepage gleization. Only treatment 4 demonstrated a high TS 'or most column seepage, the high initial contam- above 200 mg l-' throughout the experiment nation concentration diminished with time (Figs 3 because of the high biodegradability of its organic liner. High levels of TS seepage suggest the degrada- and 4). tion of the physical seal which contributes to the sealing of the soil along with the effects of gleiza- Table 4. Statistical comparison of liner infiltration rates tion. Despite soil pore size, and thus k reduction by gleization, the loss of organic particles signified a rreatment Regression equation r scaling lower titan expecteo global scaling effect. time" The EC of the seepage was initially equivalent to 1 1=10-4'"'_00'5, -0'98 279 that of the wastewater, of 2.44 mmhos cm-'. After 2 1=10-5.81-`1011' -0.93 290 20 days, the EC had increased to 10-20 mmhos 560-0U23r _0.96 147 cm- because of the displacement of salts in the soil 4 1=10 3 1=10 505-0023, -0.98 172 by the cations of the seepage and the release of salts 5 /=10-656—' 0019r -Q'79 128 from the manure. Treatment 4 demonstrated the 6 1=10-5'"-0026, _0.95 147 _ highest levels of EC, of 20 mmhos cm-' after 20 Note:/—seepage rate, in s '. days because of the higher content of its liner -time,days. manure. r-correlation coefficient. The TKN and NH4-N of the seepage were initially `To reach a seepage rate of 1 x 10-9 m s—1. of the order of 200 and 125 mg I-', but dropped 9.0 • 150 \ y 8.5 P . �..•i /� 100 a �r�/•"P r "q• •� 1 e 0•.. yt rl; �zE ❑ ,\ 8.0 F 50 •••:\\• 200 0 . c •• - 100 100 '•o. / \ D \\• 9• 50 20 E ♦ 0 ,,,��ppp -D- • 00 "A v:' E 10 �Y/� --O"—B-�O E 50 z . / �C`� Z 0 20 c r 80 00 20 40 60 80 0 �Time(days) Time(days) 3. Seepage pH, TS and EC as a function of time. foe mnt i •; treatment 2 --i*; treatment 3 Fig. 4. Seepage t as a function of time. Treatment 1 treatment 5 ---*; treat- treatment 2 --*5 treatment 3 nt6— treat; treatment 4 ---�; ment 4—��—�; treatment 5 ---*; treatment 6— —o. ment 6— —o. s: