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Mountable Printable Placard With Headband
A resilient headband in a shape for being mounted on the head of the user. The headband is equipped with a longitudinal slotted member for holding a placard.
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| Number | Title | Issue Date |
| 4500429 | Process for the biological purification of waste water A process and apparatus are provided for the biological purification of phosphate-containing wastewater, wherein the wastewater is treated, in the presence of activated sludge at least a portion of which is fixed on a carrier material. The process is cond... | 02/19/1985 |
| 4479876 | Process and apparatus for the biological purification of wastewater This invention relates to a process for the biological purification of wastewater in at least two immediately successive treatment stages, followed by a post clarification stage wherein the process is adapted so that a wastewater-activated sludge mixture ... | 10/30/1984 |
| 4415451 | Process for waste water disposal A process for waste water disposal is herein disclosed, in which waste water of high BOD concentration is subjected to an aeration treatment in an aeration vessel so as to reduce the BOD concentration thereof by circulating within said aeration vessel a q... | 11/15/1983 |
| 4415454 | Nitrification treatment of wastewater In a two stage activated sludge plant, where in the first stage the major proportion of the organic pollutants is decomposed and in the second stage the decomposition of the residual organic pollutants is conducted in conjunction with nitrification, the n... | 11/15/1983 |
| 4407717 | Wastewater treatment process A process for treating wastewaters with a powdered adsorbent and one or more fixed media filters, wherein biological oxidation occurs. The adsorbent is optionally regenerated and reused. In multistage operation, adsorbent is contacted with wastewater in s... | 10/04/1983 |
| 4292176 | Use of activated carbon in waste water treating process Disclosed is a process for treating waste water through the use of activated carbon. The carbon is generally added to waste water having a pH from about 4 to about 11, and is commonly added after the waste water has undergone primary treatment. Preferred ... | 09/29/1981 |
| 4289626 | Wastewater treatment The invention relates to method and apparatus for the treatment of wastewaters using a rotating biological contactor in combination with an adsorbent.... | 09/15/1981 |
| 4282102 | Activated sludge wastewater treatment having suspended inert media for biota growth In the activated sludge process for treating wastewater loss of biologically active microorganisms from the aeration-mixing tank to the clarifier is reduced and the biological process whereby wastewater is treated is made more efficient by the addition of... | 08/04/1981 |
| 4221657 | Biological fermentation substrates Fired clays, in the form of medium-sized granulates containing small quantities of trace elements which serve as nutrients for microorganisms, are used as substrates for biological filters.... | 09/09/1980 |
| 4200524 | Bio-surface separation process There is disclosed an activated sludge sewage treatment process which comprises mixing influent sewage material with activated sludge and bio-surface particulates to provide a mixed liquor. The mixed liquor is passed to an aeration zone wherein it is cont... | 04/29/1980 |
| 4168228 | Waste water purification Disclosed is an improved process for the treatment and purification of waste water. Generally the process comprises the use of primary, intermediate, and secondary treatment but tertiary treatment may also be included. Powdered activated carbon is used in... | 09/18/1979 |
| 4165281 | Method and unit for wastewater treatment by microorganisms A method and a unit for wastewater treatment with microorganisms, in which at least one non-woven fibrous mat having a three-dimensional network structure is disposed as a supporting media in an aeration tank, microorganisms are retained on the surface of... | 08/21/1979 |
| 4086161 | Ecological system and method An ecological system and method for counteracting the effects of excessive nutrient deposition (eutrophication) in bodies of water such as marshlands, inland ponds and lakes. The system makes use of clusters of substantially individualized bark fibers pos... | 04/25/1978 |
| 4076615 | Process and system for treating waste water A process of treating raw or primary waste water using a powdered, activated carbon/aerated biological treatment system is disclosed. Effluent turbidities less than 2 JTU (Jackson turbidity units), zero TOC (total organic carbon) and in the range of 10 mg... | 02/28/1978 |
| 4069148 | Industrial waste water treatment process Industrial waste water, containing impurities which poison or otherwise inhibit bacterial forms employed in biological treatment of waste water, is purified by a process which comprises subjecting the waste water to a biological treatment process in the p... | 01/17/1978 |
| 4055490 | Activated sludge process In the activated sludge process for treating waste water containing a spongy substance in a flowing state by subjecting it to aeration in an aeration tank, an improved process comprising taking out a portion of said spongy substance from the aeration tank... | 10/25/1977 |
| 3980556 | Adsorption biooxidation treatment of waste waters to remove contaminants therefrom Suspended and dissolved biodegradable carbonaceous materials and nitrogenous materials present as contaminants in waste water, typically in raw domestic or municipal sewage, are substantially removed by a one-stage treatment. The waste water is contacted ... | 09/14/1976 |
| 3968036 | Method of treating waste water This invention relates to a novel process for the treatment of waste water from municipal and industrial sources by contacting the waste water with an activated sludge at conditions at which biological oxidation takes place. In this process various water-... | 07/06/1976 |
| 3957632 | Waste-water purification A process for purification of waste waters comprising simultaneous treatment with an adsorbent such as powdered activated carbon and oxygen in the presence of activated sludge to effect nitrification, followed by denitrification in the presence of further... | 05/18/1976 |
