This invention relates to a composition comprising: (a) 10-20 wt % acidifying bacteria, (b) 30-40 wt % of an oxidising agent, (c) 5-15 wt % of an organic acid, and (d) 1-10 wt % of a chelating agent. The invention also relates to a method of removing uric acid from a waste pipe comprising the step of inserting the composition into the waste pipe.

The application relates to a method for remediation and/or restoration of an anoxic body of water (10), wherein a calcium nitrate solution (3) is added to the anoxic body of water (10), and wherein the method comprises the steps of mixing water having a percent of oxygen saturation of between 50% and 150% with the calcium nitrate solution (3), resulting in a mixture, and pumping the mixture into the anoxic body of water (10), wherein the final concentration of nitrate-N in the remedied and/or restored anoxic body of water (10) is between 1 and 20 mg/l. The application furthermore relates to a system (1) for remediation and/or restoration of an anoxic body of water (10), wherein the system (1) is provided with means to add a calcium nitrate solution (3) to the anoxic body of water (10), wherein the means to add the calcium nitrate solution (3) to the anoxic body of water (10) consists of a mixing device (2) arranged to mix the calcium nitrate solution (3) with water having a percent of oxygen saturation of between 50% and 150%, resulting in a mixture, and wherein the system (1) comprises first pumping means (5) for pumping the mixture into the anoxic body of water (10).

Systems and methods for aerobically processing waste, in which an aerobic bioreactor is in selective fluid communication with a source of oxygen-rich liquid medium. The aerobic bioreactor is configured for aerobically processing waste via bacteria fixed on media to provide processed effluent from the waste. The source of oxygen-rich liquid medium is different from the aerobic bioreactor.

A method enhancing biological digestion of wastewater sludge is provided. The method uses chlorine dioxide to accelerate and improve the efficiency of aerobic or anaerobic digestion.

This disclosure relates to physical selection, deselection or outselection for smaller, less dense, sheared or compressed particles in sludge, wherein the first deselection step occurs at the reactor or at a clarification step, by separately deselecting for such particles and then a second deselection step occurs in an external selector. This double deselection promotes the more efficient removal of slow settling particles, while simultaneously allowing for maintenance of multiple solids residence times for fast and slow growing organisms. The deselection in a clarifier occurs typically at the periphery of the tank or at the surface of a blanket using a positive or negative pressure device. Structures such as slotted or perforated plates, pipes or manifolds can be used to assist in such deselection. Baffles can also be used for such deselection.

The application relates to a method for remediation and/or restoration of an anoxic body of water (10), wherein a calcium nitrate solution (3) is added to the anoxic body of water (10), and wherein the method comprises the steps of mixing water having a percent of oxygen saturation of between 50% and 150% with the calcium nitrate solution (3), resulting in a mixture, and pumping the mixture into the anoxic body of water (10), wherein the final concentration of nitrate-N in the remedied and/or restored anoxic body of water (10) is between 1 and 20 mg/l. The application furthermore relates to a system (1) for remediation and/or restoration of an anoxic body of water (10), wherein the system (1) is provided with means to add a calcium nitrate solution (3) to the anoxic body of water (10), wherein the means to add the calcium nitrate solution (3) to the anoxic body of water (10) consists of a mixing device (2) arranged to mix the calcium nitrate solution (3) with water having a percent of oxygen saturation of between 50% and 150%, resulting in a mixture, and wherein the system (1) comprises first pumping means (5) for pumping the mixture into the anoxic body of water (10).

A method is provided for the denitrification of a substance having nitrate (NO.sub.3—) molecules therein. The method includes collecting waste organic material having fats, oils and grease (“FOG”) therein, and separating the FOG from the collected waste organic material. The FOG is mixed with a saponific reagent thereby initiating a saponification reaction to hydrolyze the FOG to fatty acid salts. A resultant FOG mixture (“RFM”) is formed having stratified layers of one or more fatty acid mixtures (“FAM”) and a glycerol fraction derived mixture (“GFDM”). The GFDM is mixed with the substance wherein heterotrophic bacteria use oxygen from the nitrate (NO.sub.3—) molecules to breakdown the GFDM thereby producing nitrogen gas.

In one aspect, the present invention provides reactor designs, component designs, and operating schemes for removing nitrates and chemical oxygen demand from any suitable wastewater stream. In another aspect, the invention also provides reactor designs, component designs, and operating schemes designed to modify and improve pH and water quality in wastewater streams.

A disclosed piping manifold for providing pulsating flow includes an outer tubular member extending along a longitudinal axis. The outer tubular member includes a plurality of outer radial openings. An inner tubular member is positionable within the outer tubular member and rotatable about the longitudinal axis. The inner tubular member includes a plurality of inner radial openings, an inlet port configured to receive a fluid, and a lumen providing a fluidic pathway between the plurality of inner radial openings and the inlet port. Rotation of the inner tubular member about the longitudinal axis is configured to periodically bring the plurality of inner radial openings in and out of registration with the plurality of outer radial openings to provide a plurality of pulsating flows of the fluid out of the outer radial openings.

A disclosed piping manifold for providing pulsating flow includes an outer tubular member extending along a longitudinal axis. The outer tubular member includes a plurality of outer radial openings. An inner tubular member is positionable within the outer tubular member and rotatable about the longitudinal axis. The inner tubular member includes a plurality of inner radial openings, an inlet port configured to receive a fluid, and a lumen providing a fluidic pathway between the plurality of inner radial openings and the inlet port. Rotation of the inner tubular member about the longitudinal axis is configured to periodically bring the plurality of inner radial openings in and out of registration with the plurality of outer radial openings to provide a plurality of pulsating flows of the fluid out of the outer radial openings.