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Continuous flow completely mixed waste water treatment method
| Details |
Inventors: Hiatt, William C.; Burnham, Walter V.; Madzy, Edward G.; Weisbrodt, Walter; Wegmann, Uwe;
Assignee: BASF Corporation (Mt. Olive, NJ)
Primary Examiner: Barry; Chester T.
Assistant Examiner:
Attorney, Agent or Firm: Borrego; Fernando A.
A method and a reactor system for continuous waste water treatment are disclosed. The method involves the steps of continuously flowing an influent into a treatment basin and continuously flowing an effluent out of the treatment basin into a clarifier. The influent is continuously and completely mixed in the treatment basin. In an additional step, oxygen is introduced into the basin for a first predetermined time period. The introduction of oxygen into the basin is then stopped for a second predetermined time period and then the steps of introducing and stopping the oxygen are repeated. The reactor system includes a treatment basin having an inlet for continuously receiving an influent stream, an outlet for continuously discharging an effluent stream, and contains a mixed liquor. At least one mixer completely and homogeneously mixes the mixed liquor. At least one source of oxygen discharges into the mixed liquor and a controller connected to the source of oxygen cycles the source of oxygen on and off In another embodiment the present invention is a reactor system for treating waste water comprising: a treatment basin having an inlet for continuously receiving an influent stream, an outlet for continuously discharging an effluent stream, and containing a mixed liquor; at least one mixer, said at least one mixer completely and homogeneously mixing said mixed liquor; at least one source of oxygen, said at least one source of oxygen discharging oxygen into said mixed liquor; and a controller connected to said at least one source of oxygen, said controller cycling said at least one source of oxygen on and off to provide alternating cycles of aerobic and anoxic conditions in the basin. |
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DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT In FIG.
1 a continuous flow completely mixed waste water treatment reactor system designed according to the present invention is generally shown at 20.
The reactor system 20 comprises a treatment basin 22 and a clarifier 24.
A pump 25 and an influent delivery pipe 26 continuously deliver influent waste water from a facility to the treatment basin 22.
The influent waste water rapidly and completely mixes with the mixed liquor 28 already in the basin 22.
The capacity of the basin 22 may be variable, for example, the present invention can be used with a basin having a capacity of several million gallons.
A plurality of mixers 30 with their associated motors 32 ensure that the mixed liquor 28 is completely and vigorously mixed at all times.
As would be understood by one of ordinary skill in the art the mixers 30 may be of various types including overhead mounted, platforms and combined with aerators.
In addition, a smaller basin 22 may require fewer mixers 30.
A plurality of aerators 34 are located in the basin 22.
As will be understood by one of ordinary skill in the art the aerators 34 may be any of several types including floating aerators, platforms and combined jet aerators/mixers.
A supply line 36 connects the aerators 34 to an oxygen source 38.
A controller 39 operably connected to the oxygen source 38 controls the release of oxygen from the oxygen source 38.
As will be understood by one of ordinary skill in the art, the oxygen source 38may comprise pure oxygen or an air mixture.
In addition, the controller 39 may either be a microprocessor connected to a valve or it could be a valve that is operated manually.
What is necessary is that the flow of oxygen into basin 22 can be controlled and cycled on and off.
A supplemental organic carbon source 40 includes a feed tube 42 that feeds into the basin 22.
There are numerous suitable supplemental carbons as is known in the art, for example, one can introduce an additional concentrated wastewater stream, preferably having little or no nitrogen in it, or methanol, or ethylene glycol or simple sugars, or mixtures of these sources
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