NOVELTY - An anaerobic apparatus for treating waste water comprises: (a) a reactor having a top portion and a bottom portion; (b) a waste water inlet opening at the bottom of the bottom portion of the reactor; (c) a pair of cross beams; (d) bacterial attachment media; (e) a treated water outlet pipe with an inlet opening; (f) a vertically movable dome cover; and (g) a methane gas outlet opening disposed at the top of the dome the apparatus.    USE - The anaerobic apparatus or method is useful for treating waste water (claimed); and for treating effluent generated during the processing of natural rubber (NR) latex to Ribbed Smoked Sheet (RSS).    ADVANTAGE - The apparatus named as high rate methanogenic reactor (HRMR), is a hybrid anaerobic digester, which utilizes advantages of both immobilized microbial growth digestion and suspended agglomerated granular bacterial digestion as in up flow anaerobic sludge blanket (UASB) reactors.    DETAILED DESCRIPTION - An anaerobic apparatus for treating waste water comprises: (a) a reactor having a top portion and a bottom portion, where the bottom portion is funnel shaped and top portion is generally cylindrical; (b) a waste water inlet opening at the bottom of the bottom portion of the reactor, the inlet opening associated with a control valve; (c) a pair of cross beams disposed across and within the reactor just above the bottom portion of the reactor; (d) bacterial attachment media disposed on the cross beams, the media having surfaces for receiving bacteria; (e) a treated water outlet pipe with an inlet opening positioned intermediate the attachment media and the top of the reactor, the pipe extending like a V and extending out of the reactor and terminating with an outlet opening outside the reactor; (f) a vertically movable dome cover disposed over the top portion of the reactor; and (g) a methane gas outlet opening disposed at the top of the dome the apparatus, where the cylindrical upper portion of the reactor is packed with media having surfaces for bacterial attachment, in conical bottom portion of the reactor without the media and in the vertically movable dome disposed over the reactor. An INDEPENDENT CLAIM is a method of treating waste water anaerobically in a reactor comprising a first anaerobically treating the waste water with suspended agglomerated granular bacterial digestion in one portion of the reactor; and again anaerobically treating the partially treated water with immobilized growth digestion in another portion of the reactor; or a method of treating waste water anaerobically in a reactor comprising first anaerobically treating the waste water with suspended agglomerated granular bacterial digestion in conical bottom portion of the reactor; and again anaerobically treating the partially treated water with immobilized growth digestion in top portion of the reactor; or a method of treating waste water anaerobically in a reactor comprising: (a) first anaerobically treating the waste water with suspended agglomerated granular bacterial digestion in the bottom portion of the reactor, where within the waste water is introduced by gravitational flow at a controlled flow rate into the bottom portion of the reactor; (b) allowing the partially treated water to move upwardly in the reactor for further treating anaerobically the waste water with immobilized growth digestion in the upper portion of the reactor, which is thickly packed with a media made of PVC having surfaces for bacterial attachment; (c) channelizing the flow of the treated water out of the reactor just at a level above the media via a V shaped outlet pipe, the outlet pipe having its two extreme ends at the same height, one end within the reactor and second end exterior to the reactor; and (d) collecting the produced methane in a vertically movable dome disposed above the top portion of the reactor and channelizing the flow of the produced methane out of the reactor via an outlet port.