An alternative arrangement of gravel media in tidal flow reed beds treating pig farm wastewater

作者：Sun G^*; Zhao Y Q; Allen S J

来源：Water, Air, and Soil Pollution, 2007, 182(1-4): 13-19.

DOI：10.1007/s11270-006-9316-6

• clogging
• constructed wetland
• tidal flow
• wastewater treatment

This paper reports the effect of using coarse substrates in the upper layer of a gravel-based tidal flow reed bed treating pig farm wastewater. The aim of this unconventional medium arrangement is to seek a solution for the problem of clogging that frequently takes place during the treatment of strong wastewaters. Results from lab-scale experiments demonstrated that, in general, employing coarse substrates in the upper layer of the reed bed gave greater efficiency for the removal of organic matter and suspended solids, due to reduced clogging. A specific clogging tendency rate was defined to quantitatively describe the clogging behaviour. Calculation of the tendency rate revealed that the unconventional medium arrangement had a clear advantage over the conventional arrangement of employing fine gravel or sand in top layer.

• 出版日期2007-6