A water remediation system and accompanying method includes remediation by reducing the concentration of nutrients in the water and dosing the water with metal ions. It has been found that through a combination of reducing nutrients present in the water and treating with metal ions, the requirement to treat with high chemical dosages is removed.

The invention pertains to a method of optimizing the chemical precipitations process in water treatment plants and waste water treatment plants using an aluminum based coagulant, wherein the optimization, which comprises the degree of contamination of the Clear water phase after precipitation and sludge separation, cost of operation and sludge production, is obtained by in situ regulation, of precipitation pH, amount of coagulant that is used in the precipitation process and the basicity of the coagulant, based at least on online measurement of degree of contamination, pH, flow and temperature of incoming untreated water and/or in the clear water phase, characterized in that the basicity of the coagulant is regulated by adding in situ, to a stock solution of polymerized aluminum based coagulant (A), acid or a solution of an aluminum based coagulant (B) having a lower basicity than the polymerized aluminum based coagulant (A) in the stock solution.

The invention pertains to a method of optimizing the chemical precipitations process in water treatment plants and waste water treatment plants using an aluminum based coagulant, wherein the optimization, which comprises the degree of contamination of the Clear water phase after precipitation and sludge separation, cost of operation and sludge production, is obtained by in situ regulation, of precipitation pH, amount of coagulant that is used in the precipitation process and the basicity of the coagulant, based at least on online measurement of degree of contamination, pH, flow and temperature of incoming untreated water and/or in the clear water phase, characterized in that the basicity of the coagulant is regulated by adding in situ, to a stock solution of polymerized aluminum based coagulant (A), acid or a solution of an aluminum based coagulant (B) having a lower basicity than the polymerized aluminum based coagulant (A) in the stock solution.

Improved methods for the removal of heavy metals, in particular cadmium, from an aqueous phosphoric acid containing composition, wherein an organothiophosphorous heavy metal precipitating agent and an ionic polymeric surfactant, particularly a cationic polyacrylamide copolymer surfactant, are both added to a phosphoric acid containing composition, particularly under vigorous mixing conditions, such as between 500 and 700 rpm. The ionic polymeric surfactant promotes the precipitation of the heavy metals. More in particular, the phosphoric acid containing composition is obtained by the acid digestion of phosphate rock, preferably by nitric acid, sulfuric acid, or a combination thereof.

Disclosed herein are compositions comprising at least one alpha-glucan graft copolymer derivative compound (e.g., ether or ester) having a degree of substitution (DoS) up to about 3.0. The precursors of these derivative compounds are graft copolymers that comprise a dextran backbone and alpha-glucan side chains. At least about 30% of the glycosidic linkages of the alpha-glucan side chains are alpha-1,3 glycosidic linkages. Further disclosed are methods of producing graft copolymer derivatives, as well as their use in various applications and products.

Disclosed herein are compositions comprising at least one alpha-glucan graft copolymer derivative compound (e.g., ether or ester) having a degree of substitution (DoS) up to about 3.0. The precursors of these derivative compounds are graft copolymers that comprise a dextran backbone and alpha-glucan side chains. At least about 30% of the glycosidic linkages of the alpha-glucan side chains are alpha-1,3 glycosidic linkages. Further disclosed are methods of producing graft copolymer derivatives, as well as their use in various applications and products.

The present disclosure relates to a solid and hydrolyzable tablet for treating contaminated water. The tablet comprises at least one an active ingredient chosen from a precipitating agent, alone or in combination with an agglomerating agent. The disclosure also relates to the use of a tablet for treating contaminated water. The disclosure also relates to a method and a device for treating contaminated water. The method comprises placing water laden with contaminant in contact with a precipitating agent and/or an agglomerating agent, dissolving these agents, mixing these dissolved agents with the water laden with contaminant so as to precipitate and/or agglomerate the contaminant, then separating said contaminant so as to obtain treated water.

The present disclosure relates to a solid and hydrolyzable tablet for treating contaminated water. The tablet comprises at least one an active ingredient chosen from a precipitating agent, alone or in combination with an agglomerating agent. The disclosure also relates to the use of a tablet for treating contaminated water. The disclosure also relates to a method and a device for treating contaminated water. The method comprises placing water laden with contaminant in contact with a precipitating agent and/or an agglomerating agent, dissolving these agents, mixing these dissolved agents with the water laden with contaminant so as to precipitate and/or agglomerate the contaminant, then separating said contaminant so as to obtain treated water.

The water treatment apparatus of the present invention comprises a flocculation part into which water to be treated is introduced, at least two flocculant adding devices installed so that different flocculants can be added to the flocculation part, one or two or more water quality measurement devices for measuring the quality of the water to be treated, and a controlling part for issuing, on the basis of the measurement result from the water quality measurement device(s), a command relating to whether addition of the flocculants to the corresponding flocculant adding device is required or not and to the added amounts of the flocculants, wherein at least one of the flocculant adding devices is an auxiliary flocculant adding device.

The present embodiments generally relate to the use of one or more polymers, e.g., one or more dry acid polymers and/or one or more dry acid polymers with salt, as flocculants, generally for treating tailings, e.g., oil sands tailings, in need of solid-liquid separation, e.g., in order to efficiently recycle water and/or to reduce the volume of tailings which may be transferred to a tailings pond and/or a dedicated disposal area.