A wastewater treatment system including a contact tank, a dissolved air flotation unit, a fermentation unit, and a biological treatment unit is disclosed. A method of retrofitting a wastewater treatment system by arranging the wastewater treatment system such that floated biosolids are fermented in an anerobic environment and fluidly connecting the biological treatment unit to receive at least a portion of the fermented solids is also disclosed. The method optionally includes providing a fermentation unit and fluidly connecting the fermentation unit to a biological treatment unit. A method of treating wastewater including combining the wastewater with activated sludge, floating biosolids from the activated wastewater, fermenting the floated biosolids, and biologically treating the effluent with the fermented solids is also disclosed. A method of facilitating delivery of soluble organic carbon to a biological treatment unit is also disclosed.

Systems and methods for the treatment of wastewater are provided. By incorporating one or more intermediate phosphate recovery reactors and manipulating the effluent and/or solid streams from those reactors, the systems and methods provide effluent and solid streams having customized phosphate content throughout the wastewater treatment process.

A calculator calculates, using a model of a process relating to water treatment, an output variable including an effluent water quality indicating a quality of effluent water flowing out of the process based on input variables including an influent water quality indicating a quality of influent water flowing into the process and a manipulated value for the process. The calculator acquires a combination satisfying a predetermined constraint condition among combinations of the manipulated value and the output variable. A controller controls the process based on the manipulated value in the combination acquired by the calculator. A calibrator regenerates a parameter representing a characteristic of the model at regular intervals, and replaces the parameter of the model with the regenerated parameter when the effluent water quality calculated according to the regenerated parameter is closer to a measured value of the effluent water quality than the effluent water quality calculated according to the parameter before regeneration.

Compositions, systems, and methods of using alkaline-producing Aluminate salts in the sludge collection and digestion steps of wastewater processing to reduce acidity and/or build alkalinity, reduce hydrogen sulfide release, and reduce phosphate in the effluent.

A system for reducing algae blooms and microbial growth in aqueous systems is disclosed. The system includes a phosphates adsorption container having an ingress and an egress and a phosphates adsorption element contained therein for gathering and removing phosphates as phosphates-rich influent water flows through the phosphates adsorption container thereby producing low phosphates concentration effluent water. The system also uses a first solution combining the phosphates gathered from the influent water producing a phosphates-enriched first solution and for restoring high loading capacity for adsorption of phosphates properties and high attraction to phosphates properties of the phosphates adsorption element. The system includes a first solution recovery element for receiving the phosphates-enriched solution and for separating the phosphates from the phosphates-enriched first solution.

Methods and apparatus for precipitating dissolved materials from an aqueous solution are provided. In an embodiment, the method comprises: introducing the aqueous solution into a reactor and introducing a source of magnesium (Mg) into the reactor in a quantity sufficient to cause the dissolved materials to precipitate into crystals. The source of Mg is introduced into the reactor in the form of particles of a Mg-containing material. The source of Mg has a solubility in the aqueous solution of less than about 1 g/L. Alternatively, the concentration of Mg in the reactor is less than about 0.03 mol/L. In an embodiment, the apparatus comprises a reaction tank having an inlet and an outlet and a hydration tank associated with the reaction tank and configured for hydrating a source of Mg in an aqueous solvent and introducing the source of Mg as a hydrated slurry into the reaction tank.

The present invention relates to a method of treating sludge containing phosphorus, ammonia and magnesium and enhancing the dewaterability of the sludge. The sludge is directed into a biological fermenter operated under anaerobic conditions. By controlling the temperature of the sludge in the fermenter or the hydraulic retention time of the sludge in the fermenter, phosphorus, ammonia and magnesium is released from the solids in the sludge into a liquid forming a part of the sludge. Sludge from the fermenter is subjected to a solids-liquid separation process that produces a concentrated sludge and a liquid. The concentrated sludge or separated solids is directed to a thermal hydrolysis reactor that thermally hydrolyzes the concentrated sludge. After thermally hydrolyzing the concentrated sludge, the concentrated sludge is directed to an anaerobic digester that anaerobically digests the concentrated sludge.

The present invention discloses a highly effective in situ treatment method for endogenous pollution in sludge, belonging to the field of environmental engineering water treatment. In view of the problem that it is difficult to effectively treat the endogenous pollution of river sludge, the present invention provides the highly effective in situ treatment method for endogenous pollution in sludge, which specifically adopts a combination of phoslock, calcium peroxide and aluminum modified zeolite to perform in-situ remediation of sludge, effectively inhibit the release of endogenous pollution of sludge, facilitate the ecological treatment of polluted water subsequently, and finally realize the long-term water improvement against pollution.

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.

A method for predicting a discharge level of an effluent from decentralized sewage treatment facilities, the method including: measuring the conductivity of an influent, the conductivity and suspended solids concentration of an effluent of a plurality of decentralized sewage treatment facilities; repeatedly measuring a pH, a concentration of COD, a concentration of ammonia nitrogen, the concentration of total phosphorus of the effluent of each of the plurality of decentralized sewage treatment facilities; calculating average values of the pH, the concentration of COD, the concentration of ammonia nitrogen, the concentration of total phosphorus; comparing the average values with a local sewage discharge standard, and determining a discharge level of the effluent; constructing a predictive model; and sampling an influent and an effluent of a sewage treatment facility, measuring the conductivity of an influent, the conductivity and suspended solids concentration of the effluent, inputting the obtained data to the predictive model.