Chemistry: molecular biology and microbiology – Process of utilizing an enzyme or micro-organism to destroy... – Treating gas – emulsion – or foam
Patent
1998-10-13
2000-05-30
Redding, David A.
Chemistry: molecular biology and microbiology
Process of utilizing an enzyme or micro-organism to destroy...
Treating gas, emulsion, or foam
4352861, 4352865, 4352971, 422122, 95 1, 21050027, C12S 500
Patent
active
060690038
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a process in so-called biofilters, in which contaminated gas, e.g. air, is made to pass through and is thereby cleaned in a bed of bed media arranged in a container, comprising the measuring of the moistness of the bed and the supply of fluid, e.g. water, in order to maintain a desired moistness.
The invention also relates to a device for performing the process.
Moreover, the invention relates to a device for moistening the bed media.
BACKGROUND OF THE INVENTION
Techniques of the type mentioned above are previously known. In such known techniques the measuring of the moistness, i.e. the specific fluid content of the bed, is a big problem. Measuring based on measuring the conductivity by means of electrodes introduced into the bed is sensitive to disturbances, unstable and thereby extraordinary difficult to calibrate, amongst others because of oxidation of the measuring electrodes. Measuring based on capacitive measurements is not suitable for water-saturated substances.
SUMMARY OF THE INVENTION
The present invention relates to a technique which solves the above mentioned problems and permits an exact measuring of the average moistness of the bed.
Consequently the invention relates to a method for determining the moisture content of a bed of bed media in a biofilter in which polluted gas is passed through the media arranged in a closed container. The method is specially characterized by the step of determining changes in the weight of the container.
The invention refers further to a device for controlling the moisture content of bed media in a bed in a biofilter comprising a bed of bed media arranged in a closed container. The device is especially characterized by means for measuring the weight of the container.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described more closely below in association with examples of embodiments and with the appended drawings, where:
FIG. 1 shows schematically a vertical, central section through a biofilter according to a first embodiment of a device according to the invention;
FIG. 2 shows the filter according to FIG. 1 seen from above in FIG. 1;
FIG. 3 is a plan view showing a cross-section along line III--III in FIG. 4 of a second embodiment of a biofilter in accordance with the invention; and
FIG. 4 is a longitudinal cross-sectional view along line IV--IV in FIG. 3.
FIG. 5 is a longitudinal cross-sectional view of a third embodiment of a biofilter in accordance with the invention;
FIG. 6 shows a longitudinal cross-section of a fourth embodiment of a biofilter in accordance with the invention.
DETAILED DESCRIPTION OF THE INVENTION
For the sake of simplicity, similar parts of the different embodiments shown in the figures have the same reference numbers.
In FIG. 1 a so-called biofilter with reference numeral 1 comprises a bed 3 of bed media comprising micro-organisms which can break down pollutants arranged in an essentially closed container 2. The bed is intended to be supplied, preferably from above, via inlet 4 with polluted gas, e.g. usually air, which it is intended will pass through, and thereby be cleaned, in the bed and leave the container, cleaned, via the outlet 5. According to the embodiment shown there is an air flow forcing means 6 to suck the gas through the bed. Moreover, according to the embodiment shown, the bed is supported on a grid arrangement 7 which leaves a free space 8 under the bed in the container.
A weight-sensing means 9, for example comprising a force-sensing strain-gauge arrangement or load cell of a known type, is arranged in connection to a support element 10 for the container, whereby the bed in its entirety together with the container is intended to be weighed to determine the average moisture of the bed, i.e. the average fluid content of the bed. Normally the fluid is mainly water. According to an alternative embodiment, weight-sensing means 9 are connected to a suspension element 11 for the container, such as shown dashed in FIG. 1. Combinations of both these alte
REFERENCES:
patent: 5618730 (1997-04-01), Eder et al.
Abstract of JP, A, 1-274825, Nov. 2, 1989.
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