Abstract: A water remediation device is disclosed, including a water-permeable outer fabric defining a cavity therein, a buoyant core disposed within the cavity, and a mass of water remediation media including biochar disposed between the buoyant core and the water-permeable outer fabric. The remediation media is configured to reduce a quantity of a polyfluoroalkyl substance present in a sample of contaminated water when the remediation device is placed in the sample of contaminated water. The device may be formed into an elongated boom that is configured to float on or partially-submerge in water. Alternatively, the device may be formed of a pad or blanket that may be entirely submerged in water during use.

Abstract: A method of time delayed reduction in the molecular weight of polymers in a viscosified fluid and a method of time delayed breaking of viscosified fluids through treatment of the viscosified fluid with a viscosity breaking composition. The viscosity breaking composition is formed from a peroxygen compound, a peroxygen inhibiting agent and a peroxygen catalyzing agent, where the relative concentration of the components determines the duration of the a time interval require for breaking the viscosified fluid.

Abstract: A method of reducing the viscosity of a viscosified fluid in an underground drilling operation comprising, where the introduction of a chelated transition metal catalyzes the viscosity reduction of the viscosified fluid. The chelated transition metal may be ferric methylglycinediacetate. Additionally, an uninhibited oxidizing agent, such as a peroxygen compound, may also be present in combination with the chelated transition metal to catalyze the viscosity reduction of the viscosified fluid.

Abstract: The present application is directed to a method of remediation of an organic contaminant through the formation of a treatment zone defined by an introduction of biochar slurry that concentrates the contaminate in the treatment zone. In one embodiment, the biochar slurry catalyzes the oxidation and/or reduction of the contaminate in the treatment zone. The present application may be applied to in situ or ex situ contaminant remediation.

Abstract: A method of time delayed reduction in the molecular weight of polymers in a viscosified fluid and a method of time delayed breaking of viscosified fluids through treatment of the viscosified fluid with a viscosity breaking composition. The viscosity breaking composition is formed from a peroxygen compound, a peroxygen inhibiting agent and a peroxygen catalyzing agent, where the relative concentration of the components determines the duration of the a time interval require for breaking the viscosified fluid.

Abstract: 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.