Abstract: In a system for separating crystals from sludge, or from separated water generated when sludge is subjected to a concentration process or a dewatering process, aspects of both phosphorus removal and phosphorus recovery can be satisfied, MAP having a high degree of purity can be recovered, and stable treatment can be performed such that the MAP recovery rate is high and blockages of a hydrocyclone do not occur. An aspect of the present invention is a crystal separation apparatus for separating crystals from sludge, or from separated water generated when sludge is subjected to a concentration process or a dewatering process, comprising a hydrocyclone for separating the crystals from the sludge or separated water introduced into the hydrocyclone, and a return pipe A for returning the sludge or separated water which flows out from an overflow riser of the hydrocyclone to a sludge or separated water introduction portion of the hydrocyclone.

Abstract: A first aspect of the present invention relates to a digested sludge treatment apparatus for treating digested sludge generated by subjecting organic waste matter to anaerobic digestion, comprising: an apparatus for decarbonating the digested sludge; a removal apparatus for removing coarse contaminant particles from the digested sludge; and an apparatus for separating or concentrating crystals containing magnesium ammonium phosphate from the digested sludge after the digested sludge passes through the decarbonation apparatus and removal apparatus.

Abstract: In a system for separating crystals from sludge, or from separated water generated when sludge is subjected to a concentration process or a dewatering process, aspects of both phosphorus removal and phosphorus recovery can be satisfied, MAP having a high degree of purity can be recovered, and stable treatment can be performed such that the MAP recovery rate is high and blockages of a liquid cyclone do not occur. An aspect of the present invention is a crystal separation apparatus for separating crystals from sludge, or from separated water generated when sludge is subjected to a concentration process or a dewatering process, comprising a liquid cyclone for separating the crystals from the sludge or separated water introduced into the liquid cyclone, and a return pipe A for returning the sludge or separated water which flows out from an overflow riser of the liquid cyclone to a sludge or separated water introduction portion of the liquid cyclone.

Abstract: A process and an apparatus for efficiently recovering magnesium ammonium phosphate (MAP) crystals of high purity and good quality in the technique of removing phosphorus and the like as MAP crystals from wastewater containing high concentration organic substance, phosphorus and nitrogen such as a digested supernatant liquor of human waste sewage and septic tank sludge, a digested liquor of sludge, chemical plant wastewater, and simultaneously recovering the MAP crystals.

Abstract: A first aspect of the present invention relates to a digested sludge treatment apparatus for treating digested sludge generated by subjecting organic waste matter to anaerobic digestion, comprising: an apparatus for decarbonating the digested sludge; a removal apparatus for removing coarse contaminant particles from the digested sludge; and an apparatus for separating or concentrating crystals containing magnesium ammonium phosphate from the digested sludge after the digested sludge passes through the decarbonation apparatus and removal apparatus.

Abstract: The present invention has an object to provide a process and an apparatus for efficiently recovering magnesium ammonium phosphate (hereinafter referred to as “MAP”) crystals of high purity and good quality in the technique of removing phosphorus and the like as MAP crystals from wastewater containing high concentration organic substance, phosphorus and nitrogen such as a digested supernatant liquor of human waste sewage and septic tank sludge, a digested liquor of sludge, chemical plant wastewater, and simultaneously recovering the MAP crystals.

Abstract: The present invention relates to a technology which can efficiently concentrate a suspension liquid which needs to be concentrated in sewage treatment plants or various waste water treatment plants, particularly sludge or the like which contains a large amount of odor components which will adversely be decayed and is hard to concentrate. The present invention can prevent odor substances from being produced in a concentration process, and can remarkably reduce the amount of odor components, carbonic acid, and the like contained in concentrated sludge or a lower separated liquid. Specifically, in a process of concentrating or dewatering residual evaporated substances in a liquid, when sludge is held under a reduced pressure of 5 to 70 kPa for less than 15 minutes, a portion of gas components dissolved in the liquid is changed into gaseous phase, and activation of microorganisms in the liquid is restricted.

Abstract: The present invention provides a concentration type aggregation reaction apparatus having a concentration screen, which enables an aggregation reaction to be conducted in sludge and the sludge to be concentrated by separation of a liquid by means of a single apparatus. The concentration screen is in a cylindrical form and includes slits having horizontal openings. A decelerating device is connected to an upper portion of a shaft for an agitator for agitation in the tank and brushes are connected to the decelerating device. The brushes are adapted to revolve along opposite surfaces (on a primary side and a secondary side) of the screen. By use of these brushes, aggregates adhered to the screen are continuously removed.