초록 ▼

The invention relates to a method for regulation of aeration in a biological filter of the type comprising conveyance means (3) bringing water to be filtered into the lower part of the filter, a filter bed (2) acting as a support to the biomass, means of distributing an oxygenated gas (5, 5a) in the

The invention relates to a method for regulation of aeration in a biological filter of the type comprising conveyance means (3) bringing water to be filtered into the lower part of the filter, a filter bed (2) acting as a support to the biomass, means of distributing an oxygenated gas (5, 5a) in the filter bed (2), a layer of filtered water (7) above the said filter bed, a nozzle for (4) of discharging the filtered water in the upper part of the filter, characterized in that it consists of taking account of the efficiency Ct with which the biomass uses the distributed oxygen to regulate the said distributed oxygenated gas flow and/or its concentration in molecular oxygen, in order to optimize the quantity of molecular oxygen distributed by the said distribution means.

대표청구항 ▼

[ We claim:] [1.] A method of treating waste water and regulating the aeration of a biological filter used in treating the waste water, comprising:a) directing waste water into the biological filter and through a filter bed that supports a biomass used to degrade carbon-based and/or nitrogen-based p

[ We claim:] [1.] A method of treating waste water and regulating the aeration of a biological filter used in treating the waste water, comprising:a) directing waste water into the biological filter and through a filter bed that supports a biomass used to degrade carbon-based and/or nitrogen-based pollution of the water to be filtered;b) directing an oxygenated gas into the filter bed and distributing the oxygen throughout the filter bed;c) holding a layer of filtered water above the filter bed;d) discharging the filtered water from the biological filter; ande) determining the efficiency with which the biomass uses the distributed oxygen by determining a factor C.sub.T, which is a function of temperature and dissolved oxygen concentration, and regulating the oxygenated gas flow into the biomass in accordance with the determined factor C.sub.T. [13.] A system for treating waste water and regulating the flow of oxygenated gas into the system, comprising:a) a biological filter having a housing and a filter bed for supporting a biomass disposed within the housing;b) an inlet for directing waste water into the biological filter;c) an oxygenated gas inlet for directing oxygenated gas into the biological filter and through the filter bed;d) the housing having a water holding area disposed over the filter bed for holding filtered water;e) a dissolved oxygen sensor disposed within the water holding area and, during waste water treatment, submerged within the filtered water held therein; andf) a calculation and regulation unit for determining the efficiency C.sub.T with which the biomass uses dissolved oxygen by determining the dissolved oxygen concentration in the filtered water held within the water holding area, and in response to the determined C.sub.T, varying the flow of oxygenated gas into the biological filter so as generally to increase the efficiency of the dissolved oxygen uptake by the biomass. The system of claim 13 including a temperature sensor disposed within the water holding area and during waste water treatment submerged within the filtered water disposed therein, and wherein the calculation and regulation unit in determining C.sub.T utilizes the measured temperature by the temperature sensor. The system of claim 13 wherein for a given initial quantity of pollution in the water to be filtered, there is a C.sub.Tref and wherein the calculation and regulation unit controls the flow of oxygenated gas into the biological filter, such that C.sub.T at various times approaches or approximates C.sub.Tref. The system of claim 14 wherein said temperature sensor and said dissolved oxygen sensor are placed in the filtered water at a height H above the upper surface of the filter bed, the height H being greater than the height H.sub.min, sufficient to enable dissolution of gaseous oxygen output from the filter bed in the form of bubbles until equilibrium.