公开(公告)号：US20210340037A1

公开(公告)日：2021-11-04

申请号：US17279880

申请日：2019-09-26

申请人： Dexerials Corporation

发明人： Takayuki ABE ,  Masahiko ITO

IPC分类号： C02F1/56 ,  C02F1/52 ,  C02F11/147 ,  C02F11/143 ,  B01D21/01

摘要： An anionic flocculant including: galactomannan; and a polysaccharide other than the galactomannan, wherein the anionic flocculant has a bulk density of 0.50 g/cm3 or more but 1.00 g/cm3 or less, the anionic flocculant has a particle diameter D50 of 250 μm or more but 850 μm or less, and the anionic flocculant has a particle diameter D10 of 150 μm or more.

公开(公告)号：US20210283577A1

公开(公告)日：2021-09-16

申请号：US17334586

申请日：2021-05-28

申请人： DAIKI CO., LTD.

发明人： Junji YOSHINAGA

IPC分类号： B01J20/28 ,  B01J20/32 ,  B01J20/22 ,  C02F11/147

摘要： A water absorption treatment material absorbs a liquid, and includes a grain. The grain has a water absorbing property. The grain is in an obliquely-cut columnar shape having a side surface, and first and second bottom surfaces.

公开(公告)号：US20210230039A1

公开(公告)日：2021-07-29

申请号：US15733867

申请日：2019-05-30

申请人： KURITA WATER INDUSTRIES LTD.

发明人： Shigeru SATO ,  Shihoko SEKIGUCHI ,  Minoru WATANABE

IPC分类号： C02F11/147 ,  C08F120/34 ,  C08F120/56 ,  C08L33/16 ,  C08L33/26

摘要： Provided is a sludge dehydration agent which enables the formation of stiff and coarse flocs even when added in a relatively small amount, has excellent gravity filtration properties, enables the production of a dehydrated cake having a low water content, and also enables an efficient dehydration treatment. A sludge dehydration agent comprising a polymer having a constituent unit derived from a cationic monomer, wherein the colloid equivalent value decrease rate of the polymer, which is calculated from mathematical formula 1, is 10% or more. (In mathematical formula 1, the colloid equivalent value (I) is a colloid equivalent value at pH 4 which is measured in deionized water by a colloid titration method, and the colloid equivalent value (II) is a colloid equivalent value at pH 4 which is measured in salt water having a concentration of 0.01 mol/L by a colloid titration method.)

公开(公告)号：US10829402B2

公开(公告)日：2020-11-10

申请号：US16307671

申请日：2017-06-07

申请人： Evoqua Water Technologies LLC

发明人： Timothy Lindemann ,  Michael Casey Whittier

IPC分类号： C02F9/00 ,  C02F3/12 ,  C02F1/48 ,  C02F1/52 ,  C02F1/56 ,  C02F11/04 ,  C02F1/28 ,  C02F11/147 ,  C02F11/145 ,  C02F11/127 ,  C02F103/32 ,  C02F103/34

摘要： Disclosed are apparatus and methods for treating wastewater. In one example a system for treating wastewater treatment is provided. The system comprises a biological reactor having an inlet in fluid communication with a source of wastewater and an outlet, the biological reactor configured to treat wastewater from the source of wastewater and output a biologically treated wastewater from the outlet, a solids-liquid separation system having an inlet in fluid communication with the outlet of the biological reactor and configured to separate the biologically treated wastewater into a solids-lean effluent and a solids-rich waste activated sludge (WAS), a treatment subsystem comprising a digester, an inlet in fluid communication with a WAS outlet of the solids-liquid separation system, and an outlet for providing ballasted and digested WAS, and a ballast feed system configured to deliver ballast to one of the biological reactor and the treatment subsystem.

公开(公告)号：US10703662B2

公开(公告)日：2020-07-07

申请号：US16093029

申请日：2017-04-07

申请人： Kemira Oyj

发明人： Joonas Likander ,  Sakari Halttunen ,  Outi Grönfors ,  Bengt Hansen

IPC分类号： C02F11/14 ,  C02F1/52 ,  C02F1/56 ,  C02F3/28 ,  C02F1/00 ,  C02F11/04 ,  C02F1/38 ,  C02F11/147 ,  C02F11/143

摘要： The present invention relates to a process for treating primary sludge in a wastewater treatment plant, comprising the steps of admixing an organic coagulant and/or polymer to wastewater; allowing a primary treatment of the wastewater in the presence of the organic coagulant or polymer; separating solids as a primary sludge from said primary treatment; and dewatering the primary sludge. The present invention further relates to a method of improving primary sludge dewaterability and improving energy balance of a wastewater treatment plant.

公开(公告)号：US20200172420A1

公开(公告)日：2020-06-04

申请号：US16624023

申请日：2018-06-21

申请人： Biovac Solutions Inc.

发明人： Terry SULPHUR

IPC分类号： C02F11/121 ,  C02F11/147 ,  B01D29/11 ,  B01D35/26 ,  B01D35/027

摘要： An apparatus for dewatering sludge comprises a tank having an internal space divided by a dividing wall into an intake chamber and an extract chamber, an intake pipe connected to the intake chamber by an intake valve, a discharge pipe connected to the extract chamber by a discharge valve, and a transfer pipe providing fluid communication between the intake chamber and the extract chamber. The transfer pipe has first opening near the bottom of the intake chamber, and a second opening near the top of the extract chamber. A pump selectively creates positive and negative pressure within the intake chamber. A screen is positioned within the extract chamber between the second opening of the transfer pipe and the discharge pipe. —15—

公开(公告)号：US20200087186A1

公开(公告)日：2020-03-19

申请号：US16494587

申请日：2018-03-19

申请人： S.P.C.M. SA

发明人： Cédrick FAVERO ,  Johann KIEFFER ,  Frédéric DAGUERRE

IPC分类号： C02F11/147 ,  C02F1/56 ,  C07C309/15

摘要： The present invention relates to a method for the treatment of a suspension of solid particles in water using water-soluble (co)polymers made from the hydrated crystalline form of 2-acrylamido-2-methylpropane sulfonic acid or of at least one of the salts thereof This method is particularly useful for treating residues resulting from the mining industry.

公开(公告)号：US20200063340A1

公开(公告)日：2020-02-27

申请号：US16462570

申请日：2017-12-15

申请人： Kemira Oyj

发明人： Matti Hietaniemi ,  Rosa Carceller ,  Asko Karppi ,  Joonas Likander ,  Jyri Välimäki

IPC分类号： D21C9/18 ,  D21C5/02 ,  D21H21/10 ,  D21H17/45 ,  D21H23/04 ,  C02F1/54 ,  C02F11/147 ,  C02F11/126 ,  C02F11/125

摘要： A method is disclosed for dewatering of sludge from a pulp, paper or board making process, such as deinking sludge, including obtaining of an aqueous sludge including an aqueous phase and a fibre material suspended in the aqueous phase. The sludge is subjected to a pre-thickening step, where a first part of the aqueous phase is removed from the sludge and to a pressing step, where a second part of the aqueous phase is removed from the sludge, thereby obtaining a dry pressed sludge. Before or at the pre-thickening step a polymer composition having a charge density of at the most 1.7 meq/g, preferably at most 1.5 meq/g, more preferably at most 1.1 meq/g, is added to the sludge.

公开(公告)号：US10532942B1

公开(公告)日：2020-01-14

申请号：US16512126

申请日：2019-07-15

申请人： Aicardo Roa-Espinosa ,  Kim Huong Pham

发明人： Aicardo Roa-Espinosa ,  Kim Huong Pham

IPC分类号： C02F11/147 ,  C02F1/52 ,  C02F1/56 ,  C02F11/00 ,  B01D21/01 ,  E21B21/06 ,  C02F1/28 ,  C02F11/14 ,  C02F103/10

摘要： A process for removing water from particulate material slurries produced by horizontal drilling, vertical drilling and from dredging of bodies of water is disclosed. The process comprises a first step of water removal accomplished by diffusing a chemical reagent into the particulate material source stream that results in separating out a clean water fraction and a second step of reacting the sludge with a demulsifier and a superabsorbent polymer that locks onto the water in the remaining slurry thus turning the slurry into a solid crust. The crust is ground into a particulate form and disposed in a landfill. The combined effect of the treatments is the thickening of the particulate material slurry from about 10% solids to about 25% solids. The removed water may be used for further drilling and drinking. Another benefit is the reduced volume of the particulate material that needs to be disposed in landfills.

公开(公告)号：US20190322561A1

公开(公告)日：2019-10-24

申请号：US15823864

申请日：2017-07-25

申请人： Natalya STRUNNIKOVA ,  Oleg KASSIEN ,  Arie BEKKER

发明人： Natalya STRUNNIKOVA ,  Oleg KASSIEN ,  Arie BEKKER

IPC分类号： C02F11/00 ,  C02F11/147 ,  C02F11/18 ,  C05F7/00

摘要： A method is proposed for producing a fertilizer from wastewater sludge by disinfecting a wastewater sludge in a layered form by heating at a temperature in the range of 70° C. and 80° C. and aging the heated wastewater sludge for three to five days at a temperature ranging between 30° C. to 36° C. The aging is preceded by admixing the wastewater sludge with a biological initiator. Also proposed is a system for carrying out the method. The system consists of a disinfecting unit having a heater for heating the wastewater sludge fed to the heater in a layered form and an aging unit having an aging chamber for accommodating the wastewater sludge fed from the disinfecting unit. The aging unit is provided with an agitator for admixing a biological initiator to the wastewater sludge that fills the aging chamber.