By Nicholas P. Cheremisinoff
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Extra resources for Biotechnology for Waste and Wastewater Treatment
Temperature and pH are also important for the different compounds to be treated. The carbon is either disposed of or regenerated. Carbon has also been added directly to biological treatment effluent in a contacting basin. 6 For aqueous solvent waste containing contaminants in concentrations up to 10,000 mg/l, the activated sludge process has been proposed as a potential applicable treatment. However these concentrations may be toxic to the sludge or they may be easily stripped to the atmosphere, thereby creating another hazard.
These include industrial wastewater treatment sludge, food processing wastes, and some industrial wastes containing low levels of pesticides. 52 Biotechnology for Waste and Wastewater Treatment A flow diagram for a biochemical compost bed system is shown in Figure 1. l~ Aeration is provided by an air compressor that draws a vacuum at the bottom of the pile and returns the air at the top. Additional air is added as necessary. Nutrients and water are provided through an irrigation system located at the top of the pile.
Any constructive use of this plant is most welcomed. In 1968,61%removal of PO,-P was accomplished by growing water hyacinths after a five day detention time. However, most tests to date have shown that after 25 to 30 days of continuous operations, phosphate removal efficiency declines until only 5 to 8% removal efficiency is observed. Also, hyacinth removal efficiency is much less during colder months. Research done at Gainesville, Florida, found that the nutrient removal capacity of water hyacinths was directly related to pond surface area.
Biotechnology for Waste and Wastewater Treatment by Nicholas P. Cheremisinoff