Process for separating grease and solid materials from a waste material

A process for producing an aqueous discharge liquid from a waste material containing grease, solid materials and water, the process comprising the steps of:

• passing the waste material through a first filter to separate out a first portion of the solid materials from the waste material;
• accumulating a volume of the filtrate from the first filter;
• injecting the filtrate through a series of filters at a pressure of at least 100 psi, each subsequent filter in
• the series of filters being finer than the previous filter;
• agitating the filtrate of the finest filter to produce a foamed liquid which is substantially separated into a foamed oil portion and an aqueous liquid portion;
• passing the foamed liquid into a separation tank;
• discharging the aqueous liquid portion from the separation tank;
• monitoring the level of the foamed oil portion while discharging the aqueous liquid portion;
• and
• terminating the passage of the aqueous liquid portion prior to the commencement of the discharge of the foamed oil portion.

A process for producing an aqueous discharge liquid from a waste material containing grease, solid materials and water, the process comprising the steps of:

• passing the waste material through a filter to separate out a substantial portion of the solid materials in the waste material, the step of passing the waste material through a filter comprising the steps of:
• passing the waste material through a first filter to separate out a first portion of the solid materials from the waste material;
• and
• passing the filtrate of the first filter through a second filter to separate out a second portion of the solid materials from the waste material, the second filter being finer than the first filter;
• accumulating a volume of the filtrate of the second filter;
• injecting accumulated filtrate through a series of filters at a pressure of at least 100 psi, each subsequent filter in the series of filters being finer than the previous filter;
• agitating the filtrate of the finest filter to produce a foamed liquid which is substantially separated into a foamed oil portion and an aqueous liquid portion in a separation tank;
• and
• discharging the aqueous liquid portion.

A process for separating grease and solid materials from a waste material containing grease, solid materials and water, and for conditioning the separated solid materials, a process comprising the steps of:

• passing the waste material through a filter to separate out a substantial portion of the solid materials in the waste material;
• agitating the filtrate of the filter to produce a foamed liquid which is substantially separated into a foamed oil portion and an aqueous liquid portion, the agitating step comprising the steps of:
• injecting air into the filtrate of the filter;
• and actuating a propeller disposed in the filtrate;
• passing the foamed liquid into a separation tank;
• discharging the aqueous liquid portion from the separation tank;
• monitoring the level of the foamed oil portion while discharging the aqueous liquid portion;
• terminating the passage of the aqueous liquid portion prior to the commencement of the discharge of the foamed oil portion;
• and
• conditioning the separated solid materials, the conditioning step comprising the steps of:
• collecting the separated solid materials;
• drying the solid materials to produce a dried material;
• and
• grinding the dried materials to a predetermined size.

A process for separating grease and solid materials from a waste material containing grease, solid materials and water, and for conditioning the separated solid materials, the process comprising the steps of:

• passing the waste material through a filter to separate out a substantial portion of the solid materials in the waste material, the step of passing the waste material through a filter comprising the steps of:
• passing the waste material through a first filter to separate out a first portion of the solid materials from the waste material;
• and
• passing the filtrate of the first filter through a second filter to separate out a second portion of the solid material from the waste material, the second filter being finer than the first filter;
• accumulating a volume of filtrate of the second filter;
• injecting the filtrate of the second filter through a third filter at a pressure of at least 100 psi to separate out a third portion of the solid materials from the waste material, the third filter being finer than the second filter;
• passing the filtrate of the third filter through a fourth filter to separate out a fourth portion of the solid materials from the waste material, the fourth filter being finer than the third filter;
• passing the filtrate of the fourth filter through a fifth filter to separate out a fifth portion of the solid materials from the waste material, the fifth filter being finer than the fourth filter;
• agitating the filtrate of the finest filter to produce a foamed liquid which is substantially separated into a foamed oil portion and an aqueous liquid portion;
• discharging the aqueous liquid portion;
• and
• conditioning the separated solid materials, the conditioning step comprising the steps of:
• collecting the separated solid materials;
• drying the solid materials to produce a dried material;
• and
• grinding the dried material to a predetermined size.