A method of treating a mixture of microorganisms containing phosphorus and magnesium, by first inducing the mixture microorganisms to release phosphorus and magnesium. Next an emancipation or elutriation is performed. Phosphorus and magnesium-rich liquid is then tapped off as the mixture is thickened, to produce phosphorus and magnesium-rich liquid and phosphorus and magnesium-reduced treated mixture. This treated mixture is placed in an anaerobic digester where ammonia is formed but combines very little with phosphorus or magnesium as these elements have been reduced in concentration. Then the high-ammonia mixture is dewatered, to produce an ammonia-rich liquid, which is combined with the phosphorus and magnesium-rich liquid. In one preferred example a useable struvite product is harvested from this combination. Additionally, the production of nuisance struvite in the anaerobic digester is reduced, in comparison with prior art waste treatment methods.

The solid-liquid separator that uses the substance A capable of dissolving water and oil, and performs dehydration and deoiling from an object to be treated by bringing a mixture of water and a solid, oil and a solid, or water, oil and a solid that is an object to be treated, and the substance A in a liquid state into contact with each other, and subsequently evaporating the substance A, includes a substance B that circulates while causing change of state in a closed system, a compressor that compresses the substance B, a first heat exchanger that exchanges condensation heat of the substance B and evaporation heat of the substance A, an expansion valve that decompresses the substance B which is condensed, and a second heat exchanger that exchanges evaporation heat of the substance B and condensation heat of the substance A.

A method of separating heavy water from normal through application of acoustic pressure shock waves to a fluid including heavy water and normal water and recovering separated normal water.

The present invention relates to methods for biological wastewater treatment for Se control in Se-laden wastewater. The Se contaminants in the wastewater include the Se oxyanions selenate (SeO.sub.4.sup.2-) and selenite (HSeO.sub.3.sup.?), which are biochemically reduced and transformed to elemental selenium (Se.sup.0) by microorganisms through anaerobic biological reduction. The resulting Se.sup.0 is entrained in the biomass, which is further processed to enable the efficient recovery of concentrated Se.sup.0.

This combined dehydration device continuously supplies primarily dehydrated sludge to a sludge supply part, the combined dehydration device including: a multiple rotary disk-type solid-liquid separation device and an electroosmosis dehydration device. In the multiple rotary disk-type solid-liquid separation device, a plurality of rotary shafts in which a plurality of rotary disks are fitted and mounted are arranged from the upstream side toward the downstream side and pivotally supported; while the rotary disks are rotated, water to be treated including sludge is supplied from over the rotary disks at the upstream side and is subjected to a primary dehydration treatment; and first dehydrated sludge on the rotary disks is fed and discharged from a sludge discharge part located at the most downstream portion of the rotary disks. In the electroosmosis dehydration device, a sludge supply part is provided at the upstream side of an endless filtration fabric spread between rollers.

Various examples are provided for electrokinetic dewatering of e.g., phosphatic clay suspensions. In one example, among others, a system includes a separation chamber including an anode and a cathode extending ends of the separation chamber and a power supply configured to energize the anode and the cathode to establish an electric field. An inlet at one end of the separation chamber can supply a dilute feed suspension and an outlet at another end of the separation chamber can remove supernatant water. The electric field can consolidate solids in the dilute feed suspension. Consolidated solids may be removed by a removal mechanism. In another example, a method includes supplying a dilute feed suspension including suspended solids, establishing an electric field to consolidate solids, and removing supernatant water.

Various examples are provided for electrokinetic dewatering of e.g., phosphatic clay suspensions. In one example, among others, a system includes a separation chamber including an anode and a cathode extending ends of the separation chamber and a power supply configured to energize the anode and the cathode to establish an electric field. An inlet at one end of the separation chamber can supply a dilute feed suspension and an outlet at another end of the separation chamber can remove supernatant water. The electric field can consolidate solids in the dilute feed suspension. Consolidated solids may be removed by a removal mechanism. In another example, a method includes supplying a dilute feed suspension including suspended solids, establishing an electric field to consolidate solids, and removing supernatant water.

In general, a method for treating biosolids may include measuring one or more of pH, alkalinity, magnesium concentration, ortho-phosphorus concentration, total phosphorus content, ammonia content, total nitrogen content, total solids content, total volatile solids, polymer consumption, and metal salt consumption associated with a treatment process for wastewater solids. A metal salt dosage for amending the wastewater solids may be determined based upon, at least in part, an initial ortho-phosphorus concentration and a reduction capacity of the metal salt. A magnesium compound dosage may be determined for one or more of increasing, decreasing, and maintaining a pH of the wastewater solids. The magnesium compound dosage may be based upon, at least in part, a calculated anticipated change in pH of the wastewater solids resulting from an addition of the metal salts. The method may also include amending the treatment process with the determined metal salt dosage and the determined magnesium compound dosage.

In general, a method for treating biosolids may include measuring one or more of pH, alkalinity, magnesium concentration, ortho-phosphorus concentration, total phosphorus content, ammonia content, total nitrogen content, total solids content, total volatile solids, polymer consumption, and metal salt consumption associated with a treatment process for wastewater solids. A metal salt dosage for amending the wastewater solids may be determined based upon, at least in part, an initial ortho-phosphorus concentration and a reduction capacity of the metal salt. A magnesium compound dosage may be determined for one or more of increasing, decreasing, and maintaining a pH of the wastewater solids. The magnesium compound dosage may be based upon, at least in part, a calculated anticipated change in pH of the wastewater solids resulting from an addition of the metal salts. The method may also include amending the treatment process with the determined metal salt dosage and the determined magnesium compound dosage.

A micropore ultrasonic disintegration device for sludge cell disintegration is provided, including an ultrasonic treatment chamber. The ultrasonic treatment chamber is internally provided with a first stirring mechanism which includes a reciprocating lead screw. One end of the reciprocating lead screw penetrates through a top surface of the ultrasonic treatment chamber, and the other end of the reciprocating lead screw is provided with stirring blades. The ultrasonic treatment chamber is internally provided with a second stirring mechanism, a side wall of the ultrasonic treatment chamber is provided with a first opening, and an inner wall of the ultrasonic treatment chamber is provided with a switch mechanism. The switch mechanism includes a baffle plate and a second connecting rod. The side wall of the ultrasonic treatment chamber is provided with an ultrasonic generator, and the top surface of the ultrasonic treatment chamber is provided with a liquid inlet pipe.