Effect of Algal Growth and Dissolved Oxygen on Redox Potentials in Soil Flooded with Secondary Sewage Effluent

• Main Authors: Gilvert, R. G., Rice, R. C.
• Other Authors: U. S. Water Conservation Laboratory, Science and Education Administration-FR, U. S. Department of Agriculture, Phoenix, Arizona 85040
• Language: en_US
• Published: Arizona-Nevada Academy of Science 1978
• Subjects: Hydrology > Arizona.; Water resources development > Arizona.; Hydrology > Southwestern states.; Water resources development > Southwestern states.; Algae; Algal control; Waste water treatment; Effluents; Microbial degradation; Nitrogen cycle; Dissolved oxygen; Nitrification; Chemical reactions; Soil-water-plant relationships; Environmental effects; Sewage treatment; Growth stages; Denitrification
• Online Access: http://hdl.handle.net/10150/301062

From the Proceedings of the 1978 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - April 14-15, 1978, Flagstaff, Arizona === Algal growth and oxygen evolution at the soil -water interface of soil recharge basins intermittently flooded with secondary sewage effluent (SSE) produced diurnal fluxes in dissolved oxygen (DO) in the SSE and redox potentials (Eh) in the SSE and the surface soil of the basin. The maximum daily DO-% saturation in the SSE during flooding ranged from 30 to 450 %, depending on the length of flooding and seasonal effects of temperature and solar radiation. Diurnal cycles of Eh in the SSE and the top 0 to 2 cm of soil indicated that oxygen production by algae and bacterial nitrifying and denitrifying reactions at the soil-water interface are occurring daily for limited periods during flooding and that these reactions might contribute to the net-N removal and renovation of SSE by soil filtration.