Effect of the Matrix Dam in the Paddy Field Drainage Ditch on Water Purification Based on the Physical Model Test

Abstract

(1) Setting a matrix dam in the paddy field drainage ditch has been recognized as an effective method to lower the velocity of water discharged from a paddy field in the drainage ditch, which can improve the purification efficiency of the drainage ditch for nitrogen and phosphorus pollutants, but the specific placement and thickness of the matrix dam have not been supported due to the insufficient research results. (2) Three thicknesses of the matrix dam were set in three locations of the physical model of the drainage ditch. By measuring the flow rate and water level in different sections, the optimal layout location and thickness of the matrix dam were determined. (3) When the matrix dam was located in section 1-1, the flow rate from sections A-A to C1-C1 was reduced by 0.159 m/s; when the matrix dam was located in section 2-2, the flow rate was reduced by 0.331 m/s; when the matrix dam was located in section 3-3, the flow rate was reduced by 0.360 m/s. (4) We concluded that the optimal design position of the matrix dam was section 3-3, 9.2 m from the entrance of the water flume, and the optimal design thickness was 0.3 m.

Influence of Sediment, Plants, and Microorganisms on Nitrogen Removal in Farmland Drainage Ditches

“…There are many experimental studies and model simulations on the purification effects, processes, and degradation mechanisms of pollutants in agricultural drains [21][22][23]; for example, Kroger [24,25] found that a 400 m long and 7 m wide agricultural ditch could retain 57% of soluble inorganic nitrogen. Fan et al [26] developed a nitrogen balance model by analyzing the changes in TN, NH 4 + -N, and NO 3 − -N content in the whole system, providing a new idea for enhanced nitrogen removal from drainage ditch systems.…”