A method of decontaminating soil and ground water containing organic contaminants and metal compounds. It comprises the steps of first treating such soils and ground water with an effective amount an aqueous solution containing a peroxide and a water soluble chelating agent for a time sufficient to have the water soluble chelating agent chelate at least one of the metals of the metal compounds present in the soil and ground water. Next, the chelated metals are brought into contact with the peroxide to catalytically convert the peroxide to an oxidizing agent and hydroxyl ion. The hydroxyl ion converts the halogenated organic compound into environmentally safe, non-toxic compounds. Gases that are produced from this reaction, and from the oxidation of organic compounds, are used to diffuse solution into the soil to chelate calcium and magnesium, thereby causing the sodium to be dislodged from the soil and reduce sodicity in the soil.

There is described a process for treatment of a fluid comprising an oxidizable contaminant. The process comprises the step of contacting the wastewater with a combination of: (i) a sulfide, (ii) a complex of Fe(III) and a chelating agent, and (iii) an oxidant. It has been discovered that of treatment of a fluid containing an oxidizable contaminant employing iron(III)-chelates as the Fenton catalyst may be significantly improved by including a sulfide in the reaction scheme. As described herein, by employing sulfide ion, the present inventors have been able to: (i) increase the rate of iron recycling from minutes or hours to a few seconds, and (ii) destroy benzene in an oil and gas refinery (OGR) wastewater in less than one minute. It is believed that these findings in OGR wastewater can be extended to other fluids containing other oxidizable contaminants.

Certain exemplary embodiments can provide a system, machine, device, manufacture, and/or composition of matter configured for, adapted for, and/or resulting from, and/or a method for, activities that can comprise and/or relate to, causing reactions, between sulfides in contaminated water with a ferric chelate and between sulfides in the contaminated water with an oxidizing agent, to form substantially sulfide-free water, the substantially sulfide-free water comprising the ferric chelate and the oxidizing agent.

A preparation method of an iron-cobalt fenton-like catalyst includes steps of: adopting FeCl.sub.2.4H.sub.2O and CoCl.sub.2.6H.sub.2O as reaction precursors, KBH.sub.4 as a reaction reducing agent, and polyvinyl pyrrolidone (PVP) as a surface protecting agent; preparing with a liquid phase reduction method; and after aging, suction filtration, washing, and vacuum drying, obtaining a product of the iron-cobalt fenton-like catalyst. The iron-cobalt fenton-like catalyst has a fast reaction, a relatively high treatment efficiency and a relatively wide adaptability. Moreover, an application of the iron-cobalt fenton-like catalyst in an industrial wastewater treatment is provided.

The present invention relates to a reactor for the treatment of a liquid stream, the reactor comprising: a liquid stream inlet, a reaction zone for holding the liquid stream, at least one rotating contactor in the reaction zone arranged to rotate through the liquid stream, and a liquid outlet, wherein the at least one rotating contactor includes a fabric mesh.

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 and an associated system for in-situ decontamination of a contaminated soil region (2) which contains degradable pollutants, in which a fluid substance is introduced into the soil (1) using an injection device (4, 4), wherein the fluid substance is introduced into the soil using a pressure injection method in a pressure-controlled manner and/or with an injection device that has a valve pipe with a pressure-controlled outlet valve.

A compact system for treating pharmaceutical waste at a location at which the pharmaceutical waste is disposed includes a waste influent tank configured to hold and discharge a fluid containing pharmaceutical waste, a first container configured to hold and discharge hydrogen peroxide utilized in a chemical reaction to treat the pharmaceutical waste, a second container configured to hold and discharge aqueous iron solution utilized in a chemical reaction to treat the pharmaceutical waste, a neutralizer tank in which the chemical reaction is carried out, and a drain container configured to receive treated fluid. The system excludes a UV light source.

A fungal culture is provided that incorporates concentrations of Fenton reactants and white rot fungi biomass. These components synergize to degrade recalcitrant organic compounds such as lignins, perfluorochemicals including PFOA, plastics, and related compounds, particularly with 1.5 mM H.sub.2O.sub.2, 1 mM Fe.sup.2+, and Phanerochaete chrysosporium exhibiting lignin degrading capabilities comparable to cultures of Fenton-only reaction mediums with significantly higher concentrations of hydrogen peroxide. Both the fungi and the Fenton reactants work to degrade the organic compounds. Additionally, the Fenton reactants impose oxidative stress on fast-growing microbial competitors such as E. coli, selectively inhibiting the competing bacteria and their disadvantageous effects on white rot fungi activity. The white rot fungi recycle Fe(II) ions to reduce Fenton reactant input burden. An electro-Fenton reaction process can further reduce this burden by replenishing H.sub.2O.sub.2. The resulting systems and methods demonstrate more economical and sustainable treatment of recalcitrant organic compounds.

The present invention relates to a method for zero-release treatment of brine waste water, comprising: (1) pretreatment; (2) reverse osmosis treatment; (3) advanced oxidation treatment; (4) biochemical treatment; (5) electrodialysis concentration; (6) circulating crystallization. Compared with the prior art, the method for zero-release treatment of brine waste water provided in the present invention realizes zero release or near zero release of waste water, improves salt recovery efficiency, can recover high-quality sodium sulfate, mirabilite and sodium chloride, and turns crystalline salts into a resource; the membrane treatment unit can operates stably in the process for a long operation period at a low cost, and the entire process has high economic efficiency.