NOVELTY - Wastewater treatment facility (F1) (100) comprises: a feed reservoir containing wastewater (120); a bioreactor reservoir positioned to receive the wastewater from feed reservoir and to remove organic compounds from wastewater; and a valving station (128) between the feed reservoir and the bioreactor reservoir, where the valving station comprises at least one pump (130), a wastewater conditioning element, and at least one valve for using the pumps to selectively pass to the wastewater conditioning element wastewater from the feed reservoir or wastewater re-circulated in bioreactor reservoir.    USE - The wastewater treatment facility is useful for reducing a content of volatile organic compounds dissolved in untreated wastewater (claimed).    ADVANTAGE - The wastewater treatment facility is efficient in removing volatile organic compounds (including benzene, toluene, ethylbenzene, xylene and methanol) and other hazardous air pollutants, even when environmental conditions change, and maintaining desired temperature of the wastewater thus improving digestion and biogas production.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) treating wastewater and maintaining the wastewater at a desired temperature, comprising: accessing untreated wastewater from the feed reservoir; transferring the wastewater from the feed reservoir to a bioreactor reservoir for mixing with treated wastewater and anaerobic microorganisms in the treated wastewater; conditioning at least one of the untreated or treated wastewater, so that (a) when the untreated wastewater is being conditioned, the untreated wastewater is selectively transferred to a conditioning element after being output from the feed reservoir and prior to being input to the bioreactor reservoir, and (b) when the treated wastewater is being conditioned, the treated wastewater is re-circulated and selectively transferred to the conditioning element and thereafter re-input into the bioreactor reservoir; and treating the untreated wastewater with the anaerobic microorganisms to reduce a content of volatile organic compounds dissolved in the untreated wastewater; and    (2) a wastewater treatment facility (F2), comprising: a feed reservoir having a fluid outlet; a bioreactor reservoir downstream from the feed reservoir, the bioreactor reservoir includes at least one input, a fluid output and a solid materials output; and a valving station downstream from the feed reservoir and upstream from the bioreactor reservoir, where the valving station includes a first pressure element for receiving fluid from the fluid outlet of the feed reservoir and transferring the fluid output to the at least one input of the bioreactor reservoir, a second pressure element for receiving fluid from the fluid and solid materials outlets of the bioreactor reservoir and re-introducing the fluid and solid materials to the bioreactor reservoir through the input of the bioreactor reservoir, a heater downstream relative to the first and second pressure elements and upstream relative to the input of the bioreactor reservoir, and the valves for selecting whether output of the first and second pressure elements is delivered to, or bypasses, the heater.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of the bioreactor system.    Wastewater treatment facility (100)    Tank (104)    Wastewater (120)    Valving station (128)    Pump (130)