초록 ▼

A process for increasing the efficiency of a primary clarifier in raw waste water clarification by reducing biological oxygen demand and suspended solids by the sequential addition upstream of the primary clarifier of: (1) a salt of a water soluble bi- or tri-valent metal and compositions or mixture

A process for increasing the efficiency of a primary clarifier in raw waste water clarification by reducing biological oxygen demand and suspended solids by the sequential addition upstream of the primary clarifier of: (1) a salt of a water soluble bi- or tri-valent metal and compositions or mixtures thereof, (2) fly-ash, and (3) a cationic surface active polymer composition comprising a branched, high cationic charge density containing and water soluble polymeric polyether amine solution at the primary clarifier and recovering the clarified effluent from the primary clarifier.

대표청구항 ▼

A method of initiating a process for increasing the efficacy of a primary clarifier by removing about 80 to 90%, or more, of the suspended solids present in the raw waste water effluent and reducing the biological oxygen demand to below about 30 ml/l comprising: adding to the raw waste water upstrea

A method of initiating a process for increasing the efficacy of a primary clarifier by removing about 80 to 90%, or more, of the suspended solids present in the raw waste water effluent and reducing the biological oxygen demand to below about 30 ml/l comprising: adding to the raw waste water upstream from the primary clarifier a sufficient amount of a water soluble salt of bi- or tri-valent metal selected from the group consisting of: aluminum, iron or copper, mixtures or compositions thereof, until floccing begins; adding a sufficient amount of a water soluble cationic, surface active polymeric polyether amine compound comprising the reaction product of (a) of a primary amine containing compound having a plurality of primary amino groups selected from the group consisting of: ethylene diamine, tetramethylene diamine, 1, 2 propylene diamine, 1, 3 propylene diamine, diethylene triamine, triethyleneamine tetramine, and tetraethylene pentamine or mixtures thereof; and (b) a reactant selected from the group consisting of: (1) an epihalohydrin, an epihalohydrin oligomer, and an epihalohydrin polymer; and (2) a halohydrin-terminated derivative of a polyol and an epihalohydrin selected from the group consisting of: epihalohydrin, an epihalohydrin oligomer and an epihalohydrin polymer, to prepare a water soluble, surface active, branched, polymeric polyether amine having a cationic charge; to increase the sludge forming material settling rate at the primary clarifier until the water at the top of the primary clarifier is clarified to a depth of about 3 or 4 inches; adding a sufficient amount of fly-ash to increase the dry solids content of the waste water by about 10-50% at a point downstream from the salt feed point and upstream from the amine feed point until the concentration of sludge increases while the clarity of the water in the primary clarifier is maintained; allowing the sludge forming material to settle in the primary clarifier; and recovering the reduced suspended solid and reduced biological oxygen demanding clarified waste water effluent from the primary clarifier.