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Effects of a Glucose-imposed Oxygen Demand on Land Treatment Systems¹

ABSTRACT

Laboratory experiments were conducted to quantify soil and crop interactions in a land treatment system receiving a glucose-imposed oxygen demand. Synthetic wastewaters were prepared by dissolving sufficient glucose in a plant nutrient solution to provide four levels of chemical oxygen demand (COD). The solutions were applied to soil columns cropped to reed canarygrass (Phalaris arundinacea L.) to provide a COD of 0 to 180 mmol O₂ column^–1 week^–1. The columns received the glucose for 25 weeks and were monitored for the composition of the soil atmosphere, plant yields, water use, and COD removal. The added COD elevated CO₂ concentrations in the soil atmosphere to over 480 times atmospheric levels. This coincided with a depletion of O₂ in the soil atmosphere, where a minimum concentration of 0.3 mol O₂ m^–3 was observed. Average plant yields ranged from 2.8 to 20.3 g column^–1 and were inversely proportional to the COD added. Water use ranged from 11.4 to 26.9 cm column^–1 week^–1 and was directly related to the reduction in plant growth caused by the COD loading. Greater than 97% of the added COD was removed by the simulated land treatment system.

Key Words: soil-crop interactions • synthetic wastewater • chemical oxygen demand

¹ A contribution from the Purdue Agric. Exp. Stn., Purdue Univ., West Lafayette, IN 47907. Journal Paper no. 10 364.

² Former Graduate Student now Postdoctoral Fellow and Professors, Dep. of Agronomy, Purdue Univ., respectively. The junior authors are currently located at the Dep. of Agronomy, Colorado State Univ., Fort Collins, CO 80523, and Dep. of Agronomy, Univ. of Nebraska, Lincoln, NE 68583, respectively.

Received for publication June 27, 1985.

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