An apparatus for positioning over a grease pit area, said apparatus being adapted for treating wash water in combination with said grease pit, said grease pit area having three chambers in generally horizontally adjacent relationship to one another, a first said chamber having an input part therein, and having interconnection means to permit a liquid to overflow by gravity from said first chamber into a second chamber, and from said second chamber into a third chamber, said apparatus being in a containerized form and comprising:
- A. frame means including a pair of spaced, generally parallel skid members at the base thereof,
- B. a rotary vacuum filter assembly mounted in said frame means including a tank member, a drum member whose lower portions are adapted for horizontal rotation in said tank member and which drum member is further adapted to have a layer of finely divided filter and material on circumferential surface portions thereof, vacuumization means for maintaining said circumferential surface portions interiorly at subatmospheric pressures, blade means longitudinally extending exteriorly along said circumferential surface portions and adapted to excise continuously an increment of said layer as said drum member rotates, separation means to remove a liquid filtered into said drum through said so-vacuumized circumferential surface portions as said drum member rotates, said rotary vacuum filter assembly being adapted for continuous filtration at some predetermined rate for liquid in said tank member as said drum member rotates,
- C. first and second reservoir means, each mounted in said frame means and including first pump means functionally adapted for interconnection with said first chamber and second pipe means functionally adapted for interconnection with said second chamber,
- D. a first and a second agitator means mounted in said frame means adapted for each of said first first and said second chambers, respectively, each respective said agitator means including a powerhead from which extends downwardly a shaft means on which is secured an agitator,
- E. a first pH sensor means for said first chamber adapted to generate rustantaneous pH signals representative of actual pH sensed by said first pH sensor means and a second pH sensor means in said second chamber adapted to generate second rustantaneous pH signals representative of actual pH sensed by said second pH sensor means, said first and said second pH sensor means each being mounted in said frame means,
- F. first variable valve means in said first pipe means and second variable valve means in said second pipe means,
- G. first regulator means functionally associated with said first valve means, and second regulator means functionally associated with said second valve means, each regulator means being adapted to move its respective associated valve means between substantially open and substantially closed positions in response to an input signal fed thereto,
- H. first controller means functionally interconnecting said first pH sensor with said first regulator means, said first controller means being adapted to receive and compare said first instantaneous pH signal with a first preset signal generated by said first controller means, said first preset signal being representative of a predetermined pH valve to be achieved in an aqueous phase in said first chamber during operation of said apparatus, said first controller means being further adapted to generate a first output signal representative of any difference between said first instantaneous pH signal and said first preset signal and to feed said first output signal to said first regulator means whereby passage of material from said first reservoir means into said first chamber is controlled by the pH in said first chamber during operation of said apparatus, said first controller means being mounted in said frame means,
- I. second controller means functionally interconnecting said second ph sensor with said second regulator means, said second controller means being adapted to receive and compare said secnd instantaneous pH signal with a second preset signal generated by said second controller means, said second preset signal being representative of a predetermined pH valve to be achieved in an aqueous phase in said second chamber during operation of said apparatus, said second controller means being further adapted to generate a second output signal representative of any difference between said second instantaneous pH signal and said second preset signal and to feed said second output signal to said second regulator means whereby passage of material from said second reservoir means into said second chamber is controlled by the pH said second chamber during operation of said apparatus, said first controller means being mounted in said frame means, and
- J. tube transfer means, including a pump means, adapted to transfer continuously a liquid from a lower region in said third chamber to said tank member at a rate which is not greater than said filtration rate, said tube transfer means being mounted in said frame means.