An Evaluation on Nitrates and Phosphates removal from Small Floodplains of Two Stage Channel Systems

Session: Poster session

Xiaoqiang Liu, the Ohio State University, [email protected]
Andy Ward, The Ohio State University, [email protected]

Abstract

This study aims to determine the flow residence time and bench saturation requirements to achieve target nutrient reduction levels experiments were conducted during dry periods. Nitrogen and phosphorus changes, associated with up to 9 days of bench flooding, were evaluated in the following zones: (1) surface water on the benches, (2) groundwater below the benches, and (3) groundwater below an upland zone in the grassed buffer along the top of the two-stage ditch. The results presented in this report are primarily associated with water samples collected both surface water and water from wells. Total nitrogen concentrations were reduced by 89% to 97% after 9 days. Nitrate reduction in the surface water on the benches was about 100%, after 9 days of flooding, for all three runs. In contrast, the ammonium reductions in the surface water on the benches was about 100%, after only 4 days of flooding, for all three runs. Total phosphorus concentration changes, in the surface water on the benches, varied from 5% to 85% after 9 days of flooding, for all three runs.  In contrast dissolved reactive phosphorus concentrations expectantly increased by 18% to 267 %, after 9 days of flooding, for all three runs.

1. Keyword
biogeochemistry

2. Keyword
nutrients

3. Keyword
water quality