A method of processing unconditioned syngas containing solids, semi-volatile organic compounds (SVOC), volatile organic compounds and at least one sulfur containing compound in a system comprising: - means configured for removing solids and SVOC from the unconditioned syngas, - a compressor configured to receive and compress the resultant syngas stream, - means configured for removing VOC from the compressed resultant syngas stream, and - at least one bed configured to receive VOC-depleted syngas stream and remove at least one sulfur compound, the method comprising the steps of (a) removing solid char particulates and SVOC from the unconditioned syngas using the means configured for removing solids and SVOC from the unconditioned syngas to form the resultant syngas stream in form of a first depleted syngas stream, which has a reduced amount of solid char particulates and SVOC relative to the unconditioned syngas; (b) receiving and compressing the first depleted syngas stream in said compressor and then removing VOC from the compressed first depleted syngas stream in the means configured for removing VOC to form a second depleted syngas stream, which has a reduced amount of VOC relative to the first depleted syngas stream, wherein the VOC are removed by a fluidized particulate bed adsorption system, and wherein VOC saturated adsorbent is regenerated utilizing a vacuum assisted thermal swing desorption process; (c) after step (b) removing at least one sulfur containing compound from the second depleted syngas stream in said at least one bed to produce a sulfur-depleted syngas stream which has a reduced amount of sulfur relative to the second depleted syngas stream, wherein: the VOC include a variety of benzene, toluene, phenol, styrene, xylene, and cresol, and the SVOC in the unconditioned syngas include a variety of indene, indan, naphthalene, methylnaphthalene, acenaphthylene, acenaphthalene, fluorene, anthracene, phenanthrene, (methyl-) anthracenes/phenanthrenes, pyrene/fluoranthene, methylpyrenes/benzofluorenes, chrysene, benz[a]anthracene, methylchrysenes, methylbenz[a]anthracenes, perylene, benzo[a]pyrene, dibenz[a,kl]anthracene, and dibenz[a,h] anthracene. - means configured for removing solids and SVOC from the unconditioned syngas, - a compressor configured to receive and compress the resultant syngas stream, - means configured for removing VOC from the compressed resultant syngas stream, and - at least one bed configured to receive VOC-depleted syngas stream and remove at least one sulfur compound, (a) removing solid char particulates and SVOC from the unconditioned syngas using the means configured for removing solids and SVOC from the unconditioned syngas to form the resultant syngas stream in form of a first depleted syngas stream, which has a reduced amount of solid char particulates and SVOC relative to the unconditioned syngas; (b) receiving and compressing the first depleted syngas stream in said compressor and then removing VOC from the compressed first depleted syngas stream in the means configured for removing VOC to form a second depleted syngas stream, which has a reduced amount of VOC relative to the first depleted syngas stream, wherein the VOC are removed by a fluidized particulate bed adsorption system, and wherein VOC saturated adsorbent is regenerated utilizing a vacuum assisted thermal swing desorption process; (c) after step (b) removing at least one sulfur containing compound from the second depleted syngas stream in said at least one bed to produce a sulfur-depleted syngas stream which has a reduced amount of sulfur relative to the second depleted syngas stream, the VOC include a variety of benzene, toluene, phenol, styrene, xylene, and cresol, and the SVOC in the unconditioned syngas include a variety of indene, indan, naphthalene, methylnaphthalene, acenaphthylene, acenaphthalene, fluorene, anthracene, phenanthrene, (methyl-) anthracenes/phenanthrenes, pyrene/fluoranthene, methylpyrenes/benzofluorenes, chrysene, benz[a]anthracene, methylchrysenes, methylbenz[a]anthracenes, perylene, benzo[a]pyrene, dibenz[a,kl]anthracene, and dibenz[a,h] anthracene.