Abstract: An aggregating agent injector (12) employs water currents generated by a raw water pump (10) to have flowing raw water undergo injection of an aggregating agent for aggregation of solids in raw water to form flocs, a first stirrer (13) works, as raw water inflows with the aggregating agent injected therein, for use of water currents thereof to stir inflowing raw water, and cause to outflow, a flocculation vessel (14) works, as stirred raw water inflows, to have inflowing raw water reside therein to form flocs, and cause to outflow, by using water currents thereof and a centrifugal separator (15) works, as raw water inflows with flocs therein, for use of water currents thereof to have inflowing raw water swirl, effecting centrifugal separation thereof into flocs as solids and processed water.

Abstract: A solid-liquid separator that separates raw water containing suspended solids into suspended solids (solid) and treated water (liquid) in easy and a short time is provided. A solid-liquid separator includes a separation tub, an inflow pipe configured to rotate raw water which flowed from the outlet of the inflow pipe in the separation tub, a froth discharge pipe configured to discharge the suspended solids surfaced in the separation tub and a treated water discharge pipe configured to discharge treated water by which the suspended solids were removed from raw water from the separation tub.

Abstract: A liquid cyclone is configured for inflowing raw water containing impurities as targets of collection to be forced to swirl inside to spin down impurities contained in raw water, an inflow pipe is connected with an upper portion of the liquid cyclone to supply the liquid cyclone with raw water, and configured for supplied raw water to be forced to swirl inside the liquid cyclone, a connecting portion is connected with a lower portion of the liquid cyclone, and configured with a discharge port to discharge spun down impurities from the liquid cyclone, an impurity collector is connected to the liquid cyclone with the connecting portion in between, and configured to collect impurities discharged from the liquid cyclone, an obstacle is disposed in or near the discharge port, , and configured to prevent impurities collected in the impurity collector from backing up into the liquid cyclone, and an outflow pipe is connected with a top portion of the liquid cyclone, and configured for raw water having got rid of impu

Abstract: A solid-liquid separator that separates raw water containing suspended solids into suspended solids (solid) and treated water (liquid) in easy and a short time is provided. A solid-liquid separator includes a separation tub, an inflow pipe configured to rotate raw water which flowed from the outlet of the inflow pipe in the separation tub, a froth discharge pipe configured to discharge the suspended solids surfaced in the separation tub and a treated water discharge pipe configured to discharge treated water by which the suspended solids were removed from raw water from the separation tub.

Abstract: An activated carbon adder adds activated carbon to raw water before flocculating sedimentation, to adsorb suspended matter contained in raw water, a liquid cyclone is adapted to separate activated carbon with suspended matter adsorbed thereon, from raw water containing activated carbon, an inflow line is connected with the liquid cyclone so as to cause raw water containing activated carbon before flocculating sedimentation to flow into the liquid cyclone and swirl therein, an activated carbon discharge line discharges activated carbon spun down out of raw water containing activated carbon in the liquid cyclone, from the liquid cyclone, and a pretreated water discharge line discharges raw water having got rid of activated carbon as pretreated water from the liquid cyclone, allowing for a reduced amount of chemicals to be used, with production of a reduced amount of sludge.

Abstract: A former (11) works, when supplied with wastewater containing heavy metals and hydrogen sulfide, to react heavy metals contained in wastewater with hydrogen sulfide to form sulfide salts, an acquirer (12) works, when supplied with sulfide salts and acid, to acquire hydrogen sulfide and heavy metal ions produced by reactions between sulfide salts and acid, a hydrogen sulfide supply line (13) supplies hydrogen sulfide acquired by the acquirer to the former, and a collection line (20) collects heavy metal ions.

Abstract: According to one embodiment, a membrane filtration system includes a raw water tank, a first tank, a second tank, a nanofiltration membrane module comprises a nanofiltration membrane, and removes the solute from the raw water with a solute removal rate of 1% to 30%, a first pump for supplying the raw water from the raw water tank to the module to cause the raw water to permeate through the membrane and send the water that has permeated through the membrane as a primary water to the first tank, a RO module comprises a RO membrane that further removes the solute from the primary water, and a second pump for supplying the primary water from the first tank to the RO module to cause the primary water to permeate through the membrane and send the water that has permeated through the membrane as a secondary water to the second tank.

Abstract: An aggregating agent injector (13) injects into raw water an aggregating agent for aggregating solids in raw water, a first aggregation aid injector (16) injects into raw water with the aggregating agent injected therein an aggregation aid for hardening or consolidating flocs formed by the aggregating agent, and a centrifugal separator (18) has a flocculator portion for causing raw water with the aggregation aid injected therein to whirl therein to flocculate solids in raw water, and a solid collector portion for causing raw water to swirl at higher speeds than in the flocculator portion to separate flocs from raw water.

Abstract: An aggregating agent injector (12) employs water currents generated by a raw water pump (10) to have flowing raw water undergo injection of an aggregating agent for aggregation of solids in raw water to form flocs, a first stirrer (13) works, as raw water inflows with the aggregating agent injected therein, for use of water currents thereof to stir inflowing raw water, and cause to outflow, a flocculation vessel (14) works, as stirred raw water inflows, to have inflowing raw water reside therein to form flocs, and cause to outflow, by using water currents thereof, and a centrifugal separator (15) works, as raw water inflows with flocs therein, for use of water currents thereof to have inflowing raw water swirl, effecting centrifugal separation thereof into flocs as solids and processed water.

Abstract: An aeration-less water treatment system includes an anaerobic treatment tank which subjects sewage supplied by a pump to anaerobic treatment by causing the sewage to upflow, and an aerobic treatment tank which subjects anaerobically treated water to aerobic treatment by letting the anaerobically treated water to downflow by natural downflow. The aerobic treatment tank includes an aerobic filter bed section in which carriers to which aerobic microorganisms are adhered are arranged. The aerobic filter bed section subjects the anaerobically treated water to decomposition treatment by putting the anaerobic treatment water in contact with the aerobic microorganisms adhered to surfaces of the carriers. The aerobic filter bed section is provided with an air port which takes in air into under normal pressure, thereby activating the aerobic microorganisms.

Abstract: A liquid cyclone is configured for inflowing raw water containing impurities as targets of collection to be forced to swirl inside to spin down impurities contained in raw water, an inflow pipe is connected with an upper portion of the liquid cyclone to supply the liquid cyclone with raw water, and configured for supplied raw water to be forced to swirl inside the liquid cyclone, a connecting portion is connected with a lower portion of the liquid cyclone, and configured with a discharge port to discharge spun down impurities from the liquid cyclone, an impurity collector is connected to the liquid cyclone with the connecting portion in between, and configured to collect impurities discharged from the liquid cyclone, an obstacle is disposed in or near the discharge port, and cold to prevent impurities collected in the impurity collector from backing up into the liquid cyclone, and an outflow pipe is connected with a top portion of the liquid cyclone, and configured for raw water having got rid of impurities t

Abstract: A water-purification pretreatment system removes raw water of suspended solids heavier in specific gravity than water before a water-purification treatment of raw water taken from a water source and the system includes a liquid cyclone configured for raw water to inflow thereto and to be swirled inside thereof to separate from raw water suspended solids heavier in specific gravity tan water, an inflow line connected with the liquid cyclone for raw water to be supplied to the liquid cyclone and configured for raw water being supplied to swirl inside the liquid cyclone, and an outflow line configured for raw water having suspended solids separated therefrom to outflow as pretreated water from the liquid cyclone, allowing for a reduced load on a treatment of solid suspended solids as a water treatment for water purification plants.

Abstract: An activated carbon adder adds activated carbon to raw water before flocculating sedimentation, to adsorb suspended matter contained in raw water, a liquid cyclone is adapted to separate activated carbon with suspended matter adsorbed thereon, from raw water containing activated carbon, an inflow line is connected with the liquid cyclone so as to cause raw water containing activated carbon before flocculating sedimentation to flow into the liquid cyclone and swirl therein, an activated carbon discharge line discharges activated carbon spun down out of raw water containing activated carbon in the liquid cyclone, from the liquid cyclone, and a pretreated water discharge line discharges raw water having got rid of activated carbon as pretreated water from the liquid cyclone, allowing for a reduced amount of chemicals to be used, with production of a reduced amount of sludge.

Abstract: A solid-liquid separator that separates raw water containing suspended solids into suspended solids (solid) and treated water (liquid) in easy and a short time is provided. A solid-liquid separator includes a separation tub, an inflow pipe configured to rotate raw water which flowed from the outlet of the inflow pipe in the separation tub, a froth discharge pipe configured to discharge the suspended solids surfaced in the separation tub and a treated water discharge pipe configured to discharge treated water by which the suspended solids were removed from raw water from the separation tub.

Abstract: A former (11) works, when supplied with wastewater containing heavy metals and hydrogen sulfide, to react heavy metals contained in wastewater with hydrogen sulfide to form sulfide salts, an acquirer (12) works, when supplied with sulfide salts and acid, to acquire hydrogen sulfide and heavy metal ions produced by reactions between sulfide salts and acid, a hydrogen sulfide supply line (13) supplies hydrogen sulfide acquired by the acquirer to the former, and a collection line (20) collects heavy metal ions.

Abstract: An aeration-less water treatment system includes an anaerobic treatment tank which subjects sewage supplied by a pump to anaerobic treatment by causing the sewage to upflow, and an aerobic treatment tank which subjects anaerobically treated water to aerobic treatment by letting the anaerobically treated water to downflow by natural downflow. The aerobic treatment tank includes an aerobic filter bed section in which carriers to which aerobic microorganisms are adhered are arranged. The aerobic filter bed section subjects the anaerobically treated water to decomposition treatment by putting the anaerobic treatment water in contact with the aerobic microorganisms adhered to surfaces of the carriers. The aerobic filter bed section is provided with an air port which takes in air into under normal pressure, thereby activating the aerobic microorganisms.