NOVELTY - A supplemental VOC removal station (40) is interposed between a primary VOC removal station (25) and a stripper tower (60). An initial amount of VOC and sour gas components absorbed in the alkanolamine solution is removed by the station (25). The amine solution is treated in the station (40), which is configured to liberate 70% of residual absorbed VOC remaining on amine solution, downstream from the station (25).    USE - For retrofitting sour gas treatment plants used for treating natural gas to liberate volatile organic compounds such as ethane, propane, butane, benzene, toluene and xylene in gas processing and refining industries.    ADVANTAGE - As the supplemental VOC removal station is configured to avoid liberating acid gas constituents, the VOC rich gas exhaust stream generated from supplemental station is self-flammable and hence the need for adding fuel gas is eliminated or significantly reduced, so that overall cost reduction is achieved for the gas treatment process.    DETAILED DESCRIPTION - The supplemental station is configured to liberate 70% of residual absorbed VOC remaining in amine solution downstream from primary station by maintaining the temperature at 190 degreesF and establishing pressure regulation. The supplemental station is configured to avoid liberating sour gas components from the amine solution. The remaining amount of residual absorbed VOC present in the amine solution is legally ventable without further processing. The liberated portion of residual absorbed VOC is used as a fuel gas for another process. The liberated residual absorbed VOC is flared using VOC's own combustability without using fuel gas or by adding a minimal amount of supplemental fuel gas.    INDEPENDENT CLAIMS are also included for:    (a) a sour gas treatment plant operational costs reduction method;    (b) a residual VOC components removal method;    (c) a low cost sour gas treatment plant construction method    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of gas processing plant incorporating supplemental VOC removal station.    Primary VOC removal station (25)    Supplemental VOC removal station (40)    Stripper tower (60)