Treatment of Wastewater With Slow Rate Systems: A Review of Treatment Processes and Plant Functions
Title:
Treatment of Wastewater With Slow Rate Systems: A Review of Treatment Processes and Plant Functions
Author:
Paranychianakis, Nikolaos V. Angelakis, Andreas N. Leverenz, Harold Tchobanoglous, George
Appeared in:
Critical reviews in environmental science and technology
Paging:
Volume 36 (2006) nr. 3 pages 187-259
Year:
2006-05-01
Contents:
Land treatment systems constitute a viable alternative solution for wastewater management in cases where the construction of conventional (mechanical) wastewater treatment plants (WWTPs) are not affordable or other disposal options are not available. They have proven to be an ideal technology for small rural communities, clusters of homes, and small industrial units due to low energy demands and low operation and maintenance costs. In addition, slow rate systems (SRS) may be designed using the “zero discharge” concept. The purpose of this article is to review the current trends and developments in the field of SRS, focusing on those systems in which effluent application is based on plant water requirements. Vegetation has an important role in treatment efficiency through its effects on hydraulic loading rate, nutrient removal, and biomass production. In addition, vegetation may affect the fate of trace elements and the degradation/detoxification of recalcitrant organics. Detailed knowledge of the basic processes involved in wastewater treatment and the factors governing the performance of SRS is fundamental for enhancing treatment efficiency and eliminating potential environmental and health risks. Finally, monitoring performance of SRS and adopting the appropriate management strategies are of paramount importance to maintain treatment efficiency over the a long term.