No abstract

Bioregeneration of granular activated carbon (GAC), under conditions typical of water treatment plant operation, is demonstrated conclusively for the first time in the literature. An increase in adsorptive capacity, resulting from bacterial removal of material adsorbed on carbon, was shown to occur in bench-scale GAC columns presaturated with phenol. Influent was composed of a pH 7.5 mineral medium and 2 mg/L phenol, while the influent level of dissolved oxygen (DO) was at air saturation (9 mg/L). No bioregeneration was found when influent DO was 4 mg/L. In a transient loading test, a column saturated with phenol at 0.8 mg/L was seeded and operated for a period of time with an influent DO of 9 mg/L and phenol of 0.8 mg/L at pH 7.5. The bioregeneration occurring was sufficient to significantly lower the effluent concentration resulting from a pulse of phenol (150 mg/L, 1 h) compared to a similar pulse through the column under nonseeded conditions.

Adsorption isotherms and bench-scale column studies were used in this study to compare the performance of five types of commercially available activated carbons and three types of resin for the removal of two typical pollutants, 2-methylisoborneol (MIB) and chloroform, from water. SEPTEMBER 1979

No abstract

Direct, in situ monitoring of many groundwater contaminants is possible using the Remote Laser-Induced Fluorescence (RLIF) technique.We have designed, laboratory-tested, and field-tested a prototype mobile instrument capable of performing such monitoring. It consists of a portable, computer-controlled fluorimeter with a frequency-quadrupled Nd:YAG laser as a UV excitation source, detachable fiber optic sensor, and a detection module employing two photomultiplier tubes and a dualchannel boxcar averager for signal recovery. In this report, we give a complete description of the hardware and software utilized in the instrument, along with a summary of our field testing procedures and experiences, and an assessment of the technique's current and potential capabilities. 423 Copyright© 1987 by Marcel Dekker, Inc. Downloaded by [McMaster University] at 00:02 16 June 2016 424 KENNY ET AL.