... Group, LLC 142 Fate of Pharmaceuticals in the Environment and in Water Treatment Systems Oneofthemostchallengingaspectsofbatch,column ,and eld-scaleexperi-ments is the accurate quantication of low ... the soils’naturalpH,whichrangedfrom3.6to7.5,andnottheoperationalCECvaluesatthebufferedisothermpHof5.5.CECvaluescandiffersubstantiallyoverthepH© 2008 by Taylor & Francis Group, LLC 140 Fate of Pharmaceuticals in the Environment and in Water Treatment Systems the United States use lagoons; 57% use below-ground pits; and the ... erythro - mycin,roxithromycin,andsalinomycinof41d,130d ,and6 d,respectively,whereasnodegradationoftiamulinwasobserved.51 The dissipation of tylosin was studiedinanaerobicslurriesofswinemanureobtainedfromopenandcoveredlagoonsforwhich90%disappearancetimesof40hand310h,respectively,werecalculatedusing...