The invention provides methods and compositions for reducing the malodorous sulfide gas released by a wastewater treatment system. The method preserves the vitality of waste consuming organisms within the system. The method comprises the steps of: determining the SRP PAA demand of the system, determining the aerobic PAA demand of the system, and adding a composition in an amount such that it is in excess of the SRP PAA demand but is below the aerobic PAA demand. Even though the composition increases the amount of sulfates within the wastewater it reduces the amount of SRP which prevents the malodorous sulfite gas release. The composition comprises at least one percarboxyacid.

A method for sterilizing a solid substance including contacting a solid substance with a Fenton reaction catalyst, the Fenton reaction catalyst including a reaction product, wherein the reaction product includes divalent iron, wherein the reaction product is obtained by providing a feedstock for supplying a component having a reduction effect, the feedstock being selected from the group consisting of (i) coffee grounds after extraction of coffee and (ii) tea dregs, the feedstock being a dried product, and mixing the feedstock with an iron ion-supplying source containing divalent or trivalent iron, and then adding water, the source being at least one substance selected from the group consisting of iron (II) chloride, iron (III) chloride, iron (II) nitrate, iron (III) nitrate, iron (II) sulfate, iron (III) sulfate, iron (II) hydroxide, iron (III) hydroxide, iron (III) oxide; a heme iron; a product obtained by dissolving iron ore, metallic iron or iron (III) oxide-rich red soil with an acid; and rust, and wherein in the mixing, the iron ion-supplying source is mixed so that elemental iron is contained in an amount of 0.1 to 10 parts by weight with respect to 100 parts by weight of the dried product of the feedstock.

A Fenton reactor, including a body. The body includes: from the bottom up, a sewage introduction zone, a solid acid reaction zone, tubular ceramic membranes, and a water generation zone. A water feed pump, a first chemical feed pump, and a second chemical feed pump are disposed below the body. The outlets of the water feed pump, the first chemical feed pump, and the second chemical feed pump communicate with the water inlet of the body. The water feed pump, the first chemical feed pump, and the second chemical feed pump are provided with flow meters, respectively. The solid acid reaction zone is disposed above the sewage introduction zone, and the tubular ceramic membranes are disposed in the center of the solid acid reaction zone and separate the solid acid reaction zone to form a cavity. The water generation zone is disposed above the solid acid reaction zone.

Systems and methods for removing organic contaminants from water may be used, for example, to treat produced water from a steam assisted heavy oil recovery operation. The treated produced water may be re-used to create steam. Alternatively, the produced water may be a blowdown stream treated to facilitate further treatment in a thermal crystallizer. The treatments may include pH adjustment or separating de-solubilized organics or both. Other treatments may include one or more of oxidation, sorption and biological treatments. The treatments may be used alone or in various combinations. One exemplary combination includes reducing the pH of produced water, separating de-solubilized organics from the produced water, and oxidizing the produced water or contacting the produced water with activated carbon.

Certain exemplary embodiments can provide a system, machine, device, manufacture, circuit, composition, and/or user interface adapted for and/or resulting from, and/or a method and/or machine-readable medium comprising machine-implementable instructions for, activities that can comprise and/or relate to, in a treatment zone, reacting an oxygen-comprising gas, one or more selected ferric/ferrous chelates, one or more selected nitrates and/or nitrites, and/or anaerobic wastewater.

The present invention discloses a device for Fenton fluidized-bed process and a method applying the device for wastewater treatment. It belongs to the wastewater treatment field. The device comprises an adjusting tank, a lift pump and a main reaction column. The adjusting tank is connected to a water distributing trough on the top of the main reaction column through the lift pump; the main reaction column is filled with the packing material, and below the packing material is equipped with an obcone, whereon a plurality of inlets are provided and a slag discharge pipe is connected to the bottom; above the packing material is installed an inclined plate, above which and at the upper end of the main reaction column are arranged with a partitioned trough and an outflow trough; the partitioned trough is evenly divided by a vertical plate into two independent chambers; the upper end of each chamber is connected to the water distributing trough while the lower end of each chamber is designed with an outlet; the outlets of the two independent chambers are connected to the inlets on the obcone through the first circulation pump and the second circulation pump respectively; the outflow trough is installed opposite the partitioned trough. When being used to treat biotreated wastewater, the device disclosed in the present invention can enhance use efficiency of the reagent, and maintain high effect and stability in eliminating iron in the wastewater.

A method for catalyzing a Fenton reaction, including adding hydrogen peroxide to a Fenton reaction catalyst, the Fenton reaction catalyst including a reaction product, wherein the reaction product is obtained by using roasted and ground coffee beans and/or tea leaves as a feedstock for supplying a component having a reduction effect, and mixing the feedstock for supplying the component having a reduction effect with an iron-supplying source containing divalent or trivalent iron in the presence of water.

A Fenton reaction catalyst including a reaction product as an active component, in which the reaction product is obtained by using roasted and ground coffee beans (in particular, coffee grounds) or tea leaves (in particular, tea dregs) as feedstocks for supplying a component having a reduction effect, and mixing the feedstocks for supplying the component having a reduction effect with an iron-supplying source containing divalent or trivalent iron in the presence of water. The Fenton reaction catalyst can be used to generate hydroxy radicals from hydrogen peroxide. The Fenton reaction catalyst can maintain iron in a divalent state for a long period of time.

A method of in situ remediation of an organic contaminant through the formation of a subsurface treatment zone defined by a injection biochar slurry that concentrates the organic contaminate and catalyzes the formation of free radical of an oxidizing agent. An in situ organic contaminant remediation composition including biochar particles and a persulfate oxidizing agent is also provided.

A device for treating a liquid including an organic pollutant, the device including: a device for injecting, into the liquid, microbubbles of an containing fluid containing an oxygenated constituent, the oxygenated constituent being capable of reacting with the ferrous cations Fe.sup.2+ so as to generate hydroxyl radicals OH and hydrogen peroxide H.sub.2O.sub.2; a cavitation generator capable of generating bubbles in the liquid by cavitation; a bubble implosion chamber; a generator of ferrous cations Fe.sup.2+, the cavitation bubble implosion chamber being placed in a region in which the liquid contains the ferrous cations.