Kemira Oyj

Other

Sakari Halttunen

Mehrdad Hesampour

Jonni Ahlgren

Fazlollah Azarnoush

Miia Niemelä

Jussi Ruotsalainen

Bengt Hansen

Joonas Likander

Torsten Haverinen-Nielsen

Outi Grönfors

Marina Shestakova

Hannele Havansi

Outi Gronfors

Maria Luhtala

Göran Bäckman

Hanna-Mari Kangaslahti

Matias Penttinen

Susann Härkönen

Pascal Morin

Tanja Kallio

Miia Niemela

Outi GRÖNFORS

The invention relates to a method for treating wastewater in an activated sludge process, which comprises a biological treatment step followed by a sedimentation step for separation of sludge and treated effluent water. The method comprises directing a part of the treated effluent water as a backflow from the sedimentation step to the biological treatment step, the backflow having an original pH value; adjusting the backflow pH from the original pH value to a first pH value between the sedimentation step and the biological treatment step, and adding a coagulant and/or an oxidant to the backflow after the adjustment of the backflow pH to the first pH value and before backflow's entry to the biological treatment step.

Method for treating wastewater

A method for removing biologically recalcitrant soluble organic compounds from wastewater simultaneously in an activated sludge process comprising an aeration tank and a solid-liquid separation unit, in which method at least one Al and/or Fe based inorganic metal coagulant is added to the wastewater in the activated sludge process and/or prior to conveying wastewater to an activated sludge process.

Method for removing dissolved organic compounds from wastewater

A treatment system for removing dissolved organic compounds from wastewater, which comprises a water-soluble cationic polymer, and wood-based organic material having an average particle size <10 mm. The invention relates also use of said treatment system for COD removal in the treatment of wastewaters, and a method for removing dissolved organic compounds from wastewater.

Treatment system comprising wood-based organic material and its use in wastewater treatment, and method for removing dissolved organic compounds from wastewater

The invention relates to a microbial fuel cell arrangement comprising a cell reactor. The cell reactor comprises a membrane, which has an active surface and a support surface, as well as a pore size of &#x2264;10 nm and/or a divalent ion rejection of &#x2265;50%; an anode and a cathode, which are connected with each other through an external electrical circuit; an influent inlet for liquid medium arranged at the active surface side of the membrane and at least one permeate outlet arranged at the support surface side of the membrane; an influent line connected to the influent inlet; a concentrate outlet, arranged at the active surface side of the membrane and connected to a concentrate line; and pressurisation means for creating pressure difference between the active surface side and support surface side of the membrane. The invention relates also to a method for operating a microbial fuel cell.

Microbial fuel cell arrangement and method for operating it

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.

Improving sludge dewaterability and energy balance of wastewater treatment

A method for removing humic substances comprising lignin, other lignin type compounds and their disintegration products from an aqueous alkaline waste water from a bleaching of chemical pulp, which method comprises &#x2014;obtaining an aqueous alkaline waste water comprising humic substances such as dissolved lignin, and &#x2014;adding a high cationic starch having a charge density value of at least 1.8 meq/g dry matter of starch derivates determined at pH 7-7.5 to the alkaline waste water to precipitate humic substances.

Method for removing humic substances from an aqueous alkaline solution

The present invention concerns a process for recovering phosphates from wastewater by adding to the wastewater at least one organic coagulant or polymer in a mechanical treatment step that leaves dissolved phosphorus in the water phase, separating a mechanical sludge from the treated wastewater, preferably by sedimentation, flotation or filtration, carrying the phosphorus-containing treated wastewater in a post-treatment step, where at least one chemical precipitant is added to precipitate the dissolved phosphate into solid phosphates, and separating the solid phosphates from the treated wastewater to recover the phosphates.

Recovery of phosphorus compounds from wastewater

The present invention relates to a composition for treatment of wastewaters in a membrane bioreactor comprising a mixture of inorganic coagulants and organic water soluble polymer(s), wherein the inorganic coagulants are selected from iron and/or aluminium containing compounds and the organic water soluble polymers are selected from the group consisting of anionic, cationic, nonionic polymers, polysaccharides and polyphenolic compounds and any combination thereof. The present invention further relates to a method for treating of wastewaters in a membrane bioreactor, and uses thereof.

Phosphorus precipitation and membrane flux in membrane bioreactors

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Espoo, Finland

Sakari Halttunen