An anaerobic wastewater treatment system includes a recycle tank, a bioreactor tank and a bioselector for recapturing anaerobic microbial consortia particles escaping from the bioreactor tank and returning them to the bioreactor tank. The bioreactor tank receives recycled wastewater feed from a recy
An anaerobic wastewater treatment system includes a recycle tank, a bioreactor tank and a bioselector for recapturing anaerobic microbial consortia particles escaping from the bioreactor tank and returning them to the bioreactor tank. The bioreactor tank receives recycled wastewater feed from a recycle tank and discharges via an overflow outlet treated wastewater and microbial consortia particles to a bioselector. The bioselector is adapted to separate entrained microbial consortia particles and return a feed to the bioreactor tank which including some of the treated wastewater received from the bioreactor tank and the microbial consortia particles received from the bioreactor tank. The bioselector provides a recycle feed to the recycle tank. Overflow from the bioselector provides an effluent of treated wastewater leaving the system.
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Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is: 1. An anaerobic wastewater treatment system, comprising: (a) a recycle tank including an intake for receiving wastewater, a recycle inlet for receiving recycled water and an outlet for discha
Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is: 1. An anaerobic wastewater treatment system, comprising: (a) a recycle tank including an intake for receiving wastewater, a recycle inlet for receiving recycled water and an outlet for discharging a recycle mixture including recycled water and wastewater, (b) a bioreactor tank having an intake near its lower end, an overflow outlet toward its upper end and a biogas vent at its extreme upper end, the intake of the bioreactor tank connected with the recycle tank outlet for receiving the recycle mixture from the recycle tank, the bioreactor tank containing a fluidized bed including a multitude of anaerobic bacteria microbial consortia particles adapted for digesting waste and producing biogasses including methane and carbon dioxide, the bioreactor tank overflow outlet for overflowing escape of the bioreactor tank suspension including entrained microbial consortia particles and treated water mostly free of waste, the bioreactor tank further including gas disengagement portion proximate to the overflow outlet for mechanically separating gas bubbles from said microbial consortia particles prior to passage of the treated water and the entrained microbial consortia particles through the overflow outlet, (c) a bioselector having an intake with a tangent intake geometry in communication with the overflow outlet of the bioreactor tank for receiving bioreactor tank suspension including the treated water and microbial consortia particles from the bioreactor, the bioselector also having a generally circular cross section and a cone shaped lower end, the tangent intake geometry of the bioselector intake causing the treated water to swirl within the bioselector such that suspended microbial consortia particles move toward the walls of the bioselector, the microbial consortia particles subsequently sinking to the bottom of the bioselector for collection and return via the return outlet to the intake of the bioreactor, the bioselector also having a recycle outlet in communication with the recycle tank for passage of a recycle portion of the treated water to the recycle tank and an overflow outlet for releasing an effluent portion of the treated wastewater as treated effluent leaving the system. 2. An improved anaerobic wastewater treatment system of the type having a bioreactor tank containing a fluidized bed of active anaerobic microbial consortia particles for digesting waste and a recycle tank for receiving a stream of waste water and a stream of recycle water, the improvement comprising: a bioselector having an intake with a tangent intake geometry in communication with an overflow outlet of the bioreactor tank for receiving overflow from the bioreactor tank including treated wastewater and entrained microbial consortia particles from the bioreactor, the bioselector also having a generally circular cross section and a cone shaped lower end and a tangent intake geometry for causing swirling movement of the treated wastewater and entrained microbial consortia particles, the bioselector having a generally cone shaped lower end leading to discharge pipe in communication with the intake of the bioreactor tank, such that the active microbial consortia particles having sufficient specific gravity greater than one contact the cone shaped inner wall of the lower end and enter the discharge pipe and return to the bioreactor whereby the bioreactor may be charged with greater numbers of microbial consortia particles for greater spaced loading because escaping active microbial consortia particles may be captured and returned to the bioreactor by action of the bioselector. 3. A method for capturing and returning sufficiently dense anaerobic bacteria microbial consortia particles for digesting waste in wastewater where said microbial consortia particles have a specific gravity greater than one, the method for capturing and returning such microbial consortia particles to a highly charged bioreactor tank after escaping therefrom, comprising the following steps: obtaining a bioreactor tank having: (a) a body portion for containing a volume for fluidized suspension of anaerobic bacteria microbial consortia particles, (b) an inlet at the lower end of the body portion having a distribution header for promoting distributed incoming flow of waste water, (c) a gas disengagement portion located above the body portion for disengaging biogas bubbles from the surfaces of microbial consortia particles, (d) a biogas vent for venting the released biogas bubbles and (e) an overflow outlet for passage of treated wastewater and some entrained escaping microbial consortia particles from the bioreactor tank, obtaining a bioselector including: (a) a cone shaped lower portion, (b) an inlet having tangential inlet geometry for promoting swirling flow inside the bioselector, the inlet located generally above the cone shaped lower portion, (c) an outlet located above the inlet for overflowing escape of treated wastewater effluent, and (d) a discharge outlet in communication with the lower end of the cone shaped lower portion, connecting the inlet of the bioselector to the overflow outlet of the bioreactor tank, connecting the discharge outlet of the bioselector with the inlet of the bioreactor tank, such that overflow from the bioreactor tank with entrained escaping active microbial consortia particles enters the bioselector through the tangential inlet and swirls around the cone shaped lower portion of the bioselector such that active microbial consortia particles sink to the bottom of the cone shaped lower portion for collection in the discharge outlet for return to the bioselector, whereby escaping microbial consortia particles from a highly charged bioreactor tank may be returned to the bioreactor tank thereby allowing the bioreactor tank to operate at a high level of space loading.
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