Introduction

REFRACTORY ORGANIC COMPOUNDS IN TREATED EFFLUENT AND THEIR REMOVAL BY SOIL, MILILANI, O’AHU, HAWAII

REFRACTORY ORGANIC COMPOUNDS IN TREATED EFFLUENT AND THEIR REMOVAL BY SOIL, MILILANI, O’AHU, HAWAII

Technical Report No. 115
REFRACTORY ORGANIC COMPOUNDS IN TREATED EFFLUENT AND THEIR REMOVAL BY SOIL, MILILANI, O’AHU, HAWAII

Charles Fischer, Richard E. Green,
Nathan C. Burbank, Jr.
December 1977

ABSTRACT
Increased water consumption on O’ahu has encouraged the use of treated sewage effluent for irrigation. This study seeks to identify organic compounds in treated effluent and to determine if such compounds are adsorbed by soil so that the groundwater is not adversely affected.

XAD-2 resin is used to extract and concentrate trace organic compounds in treated effluent. Electron capture gas chromatography and combined gas chromotography-mass spectrometry (GC/MS) indicate that some of the organic compounds in the treated effluent are chlorinated. Gas chromatography tests also confirm the presence of naphthalene and bromobenzene in the treated effluent.

Organic compounds which could be detected by electron capture gas chromatography data are effectively removed by the Lahaina soil when the treated effluent is applied as irrigation water to a sugarcane field. On the other hand, GC/MS results indicate that the Lahaina soil only partially adsorbs organics, such as paraffins and steroids. Laboratory measurements of adsorption of organic compounds from effluent do not adequately represent the extent of adsorption measured in the field.