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Molecular Biology

System-for-recovering-methane-gas-from-liquid-waste

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System for recovering methane gas from liquid waste

Details

Inventors: Grabis, Dietrich W.;
Assignee: United International California Corporation (San Rafael, CA)
Primary Examiner: Kratz; Peter F.
Assistant Examiner:
Attorney, Agent or Firm: Flehr, Hohbach, Test, Albritton & Herbert

A system for and method of recovering methane gas from liquid waste which is stored within a pit is disclosed herein. The methane gas is produced by causing the liquid waste to undergo anaerobic fermentation. Therefore, it is necessary to close the pit in an air tight fashion. This is carried out using a cover sheet which is fixedly disposed over the pit in an air tight but readily disengagable fashion. The liquid waste within this air tight pit is preferably agitated intermittently during its storage therein whereby to increase the amount of methane gas produced.

DETAILED DESCRIPTION What is claimed is: 1.
A system for recovering methane gas from liquid waste, comprising: an open pit extending into the ground; a cover sheet disposed over said pit; means for disengagably holding a circumferential portion of said cover sheet adjacent to a section of the ground circumscribing said pit in an air sealed fashion, whereby said sheet can be repeatedly used to cover and uncover said pit without damage to the sheet, said holding means including a downwardly extending and upwardly opening trench which extends around said pit along said section of ground circumscribing the latter and which is filled with water for receiving said circumferential portion of said cover, said holding means also including means located within said trench for maintaining a circumferential segment of said sheet portion under the water in said trench; means for directing liquid waste into said pit so as to produce said methane gas within said pit; means for removing said gas from said pit; and means for removing the waste from said pit.
2.
A system according to claim 1 wherein said last-mentioned means includes rock material located within said trench and over said circumferential sheet segment for maintaining said segment under the water in the trench.
3.
A system according to claim 1 wherein said last-mentioned means includes water floatable tubular means located within and along substantially the entire length of said trench over said circumferential sheet segment and means for maintaining said tubular means at least partially submerged within the water in said trench.
4.
A system according to claim 3 wherein said tubular means includes a plurality of hollow tubes closed at their ends and placed in end-to-end relationship to one another in said trench.
5.
A system according to claim 3 wherein said tubular means includes a single circumferential hollow tube configured to fit within said trench.
6.
A system according to claim 1 including means for agitating the waste within said pit

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