Abstract: Systems and methods are disclosed for treating wastewater, such as food and beverage industry wastewater, pulp and paper wastewater, textile wastewater, tannery wastewater, pharmaceutical wastewater, etc., which contains high concentration of COD along with high concentrations of nitrogen and phosphorus to yield a low COD output along with a low phosphorous output and a low nitrogen output. One system comprises a buffer tank, an anoxic tank, an oxic tank, and a membrane bioreactor tank fluidically connected in series with pure oxygen blown into the oxic tank.

Abstract: Raw biogas from an anaerobic digester is fed to a membrane separation unit that produces methane rich biomethane and a CO2 rich permeate that is recycled to the anaerobic digester where it is mixed with the digestate.

Abstract: A system for upgrading biogas through a membrane separation process comprises an anaerobic digester, operated under an operation pressure higher than atmosphere pressure, preferably greater than 4 baba, generating the biogas, a first membrane stage and a second membrane stage, separating the biogas into a residue stream, enriched in CH4, and a permeate stream, enriched in CO2, a compressor compressing the permeate stream to a pressure slightly greater than the operation pressure, and recycling the permeate stream back to the bottom volume of the anaerobic digester.

Abstract: In described embodiments, a process for recovery of a metal from a grounded ore comprises leaching the grounded ore with a leaching reagent, an oxidant and an oxygen vector. In particular, a process for recovery of gold from a grounded gold ore, comprises leaching the grounded gold ore with a cyanide salt, an oxidant and an oxygen vector. The oxygen vector is selected from dodecane, decane, hexadecane, or the like.