Landfill methane enhancement process
View Patent ↗A zero-discharge landfill process is disclosed herein. The process described in the present invention recycles the exhaust gases from a combustion engine which reheats the landfill and provides moisture. Additionally, the CO 2 from the exhaust gases releases additional methane. Methane production in landfills can thus be enhanced by the method of the present invention. Furthermore, a portion of the exhaust gas can be used to cultivate algae in a cultivation tank. The cultivation of the algal species is enhanced in the presence of water, CO 2 , CO, and the elevated temperatures. Optionally, a first portion of the cultivated algae can be passed through the landfill to increase methane production in the landfill and a second portion of the cultivated algae can be transferred to a biodiesel production tank, for the conversion of the one or more algal oils and lipids to a biodiesel or a biofuel by a transesterification reaction.
1. A method of increasing methane production in a landfill comprising the steps of:
passing one or more gases comprising methane produced in the landfill through a generator, wherein the generator is a methane powered generator;
operating the generator to produce an electric current, wherein the operation of the generator produces an exhaust gas stream comprising water, CO 2 , and CO at an elevated temperature; and
recycling a first portion of the exhaust gas stream to the landfill, wherein the recycled gas stream increases a temperature and a moisture content of the landfill and thereby increases methane production.
2. The method of claim 1 , further comprising the steps of:
recycling a second portion of the exhaust gas stream by passing through a tank comprising one or more methanogenic algal species and nutrients, wherein the water, CO 2 , CO, and the elevated temperature cultivate the algal species in the tank;
passing a first portion of the cultivated algae through the landfill to increase methane production in the landfill;
passing a second portion of the cultivated algae to a biodiesel production tank, wherein one or more algal oils and lipids from the cultivated algae are converted to biodiesels by a transesterification reaction; and
collecting the biodiesel produced in the production tank in a collection vessel.
3. The method of claim 2 , wherein the methanogenic algal species are selected from the group consisting of diatoms (bacillariophytes), green algae (chlorophytes), blue-green algae (cyanophytes), golden-brown algae (chrysophytes), haptophytes, freshwater algae, saltwater algae, Amphipleura, Amphora, Chaetoceros, Cyclotella, Cymbella, Fragilaria, Hantzschia, Navicula, Nitzschia, Phaeodactylum, Thalassiosira Ankistrodesmus, Botryococcus, Chlorella, Chlorococcum, Dunaliella, Monoraphidium, Oocystis, Scenedesmus, Nanochloropsis, Tetraselmis, Chlorella, Dunaliella, Oscillatoria, Synechococcus, Boekelovia, lsochysis , and Pleurochysis.
4. The method of claim 1 , wherein the electric current produced by the generator is used to operate machinery, supply power to an electric grid, power electrical devices or for other suitable applications.