TECHNOLOGY FOCUS - ENVIRONMENT - Preferred Process: An inorganic powder such as hydrated lime, fly ash, fine sand or soil may be added in flocculation. A traveling screen press is used for further dewatering. In pelletization, a dry powder is used, especially powder from liquid manure treatment, paper dry or pulp powder, finely ground waste paper, crushed straw, rice straw or coco fibers.The bioreactor contains a granulate of large surface area, treated with microorganisms. A countercurrent stream of air is passed through the reactor. The pellets are dried in a shaft trickle drier, preferably with warm air, especially using waste heat from a source such flue gas.The liquid to be purified is fed into the bioreactor at a level 30-50 cm lower than the top of the granulate filling. The granulate above this level is used for purifying the waste gas from the bioreactor. The separated solids are removed from the fast sedimentation vessel with a pneumatic pump.The plant may be a service provider's mobile unit operated on the farm, in which case the dewatered product can be left on site or dried and used thermally in the provider's central plant. Simultaneously, the liquid phase is subjected to chemical-biological purification in a bioreactor and service element hired by the farmer from the provider, with the purified water being re-used by the farmer.Preferred Plant: (all claimed) Claimed aspects are as follows:(1) Dewatering with traveling screen press and gravitational pre-dewatering with combined pre-dewatering and prethickening cylinder;(2) Fast sedimentation vessel for residual solid-liquid separation, in which filtrate and washing medium are separated from solids up to 3-5 mg/l and collect in cone of vessel as slurry which is removed periodically;(3) Suction pump for removing slurry from cone;(4) Double paddle mixer for mixing dry powder with wet slurry;(5) Extruder for pelletizing mixture;(6) Shaft trickle drier for drying pellets;(7) (a) Gasification or (b) pulsation reactor(s) for combustion of dry pellets;(8) Stirling motor(s) for generating current with flue gases;(9) Steam turbines for generating current with heat of combustion of pellets;(10) Bypass with thermostat-controlled regulating motor for regulating drying temperature and amount of outside air required for this;(11) Waste gas treatment plant made from plastics or concrete elements with scrubber and biofilter for treating drying air;(12) Bioreactor for treating mechanically clarified waste liquor, which consists of a long cylinder filled with porous carrier of large surface area such as expanded clay or expanded polystyrene, with inlet for the liquor 20-50 cm below the top and a distributor system, e.g. spray tube spiral, water- and air-permeable support for the filler, purified liquor outlet, air inlet, ventilator, means of removing slurry by suction and back-washing carrier inoculated with microorganisms and air blast at top, above biofilter.Preferred Plant: The bioreactor is fitted with chemical dosing equipment for further reduction of the chemical oxygen demand dosing sodium hypochlorite for decolorization and making the product hygienic.Preferred Mobile Plant: (all claimed) This comprises a mobile vehicle, e.g. lorry, equipped with dewatering plant with liquid manure suction pump, flocculant, treatment and dosing plant, traveling screen press combined with pre-dewatering and prethickening cylinder, washing water pump, regulation and other service elements (e.g. compressor or hoses), discharge mechanism, fast sedimentation vessel on trailer with inoculation tube, static mixer and slurry suction pump. EXAMPLE - A pig farm needed to dispose of liquid manure from 30000 pigs, which produced 330 m3 of liquid manure with 5T total solids, i.e. 16500 kg dry mass/day. Disposal was carried out in central plant with thermal utilization.    The waste was flocculated, pre-dewatered, pre-thickened and pressed to 30% total solids, then pelletized after adding dry powder and dried to 95-100%. The dry pellets were gasified in a pulsation reactor and current was generated with the heat in steam turbines. The current was used in the operation and the rest was fed into the open grid.    The filtrate and washing water were passed to the fast sedimentation vessel, treated with inorganic fine powder and flocculated if necessary. The solids were separated and passed to dewatering, whilst the mechanically purified water was passed to a bioreactor to eliminate residual chemical and biological oxygen demand, then clarified and made hygienic with sodium hypochlorite. The treated water was of drinking water quality.    The drying air was residual heat from current generation. The flue gases were cooled to the required temperature with outside air in a by-pass, then passed through the drier, scrubbed and cooled. After condensation, the air was purified in a biofilter.    Hence all that remained of the liquid manure was heat, current and about 6.5 tonne/day of ash of disposal class I, which could be disposed of at favorable cost or used for other purposes (e.g. road-building, consolidation of slopes, base and cover for waste tips, additive to concrete, slabs). On balance (allowing 7% annual interest on costs), the process gave a net profit of 7.46 Eur/m3 liquid manure.