A process for treatment of municipal wastewater plant sludge to the criteria of Class A biosolids. The process uses hydrogen peroxide and thermo-oxidation to reduce volatile suspended solids to meet the criteria. On a batch basis, waste activated sludge is introduced into a reactor; the concentration of the waste activated sludge is adjusted to about 1.5% total suspended solids with secondary effluent, if necessary; the reactor is mixed; the reactor is pre-heated to an operating temperature in a range of about 65 C. to about 90 C.; subsequently, a 50% solution of laboratory grade hydrogen peroxide is introduced into the bottom of the reactor; and the contents are heated for at least 4 hours.

A method for treating and improving the quality of pond water used in growing aquatic species for aquacultural applications by adding to the pond water active bacteria that are preferably grown on site in combination with a nitrification enhancement agent such as calcium carbonate or calcified seaweed, and an optional reaction surface area modifier such as calcified seaweed or plastic or metal particles or fragments.

This disclosure describes a biochemical reactor with an unclogging pipe. The biochemical reactor may include a tank configured to house immobilized carriers and fluid. The biochemical reactor may include a circulation conduit at least partially disposed within the tank. The circulation conduit may include a circulation inlet opening and a circulation outlet opening. The biochemical reactor may include one or more vanes disposed proximate to the circulation outlet opening. The one or more vanes may be configured to cause the immobilized carrier and the fluid exiting the circulation outlet opening to enter into a helical pattern. The biochemical reactor may include an unclogging pipe configured to clear clogging of the circulation conduit. The unclogging pipe may be disposed proximate to the circulation outlet opening. Clearing clogging of the circulation conduit may include directing a pressurized flow of air to the circulation conduit via the unclogging pipe.

This disclosure describes a biochemical reactor with an unclogging pipe. The biochemical reactor may include a tank configured to house immobilized carriers and fluid. The biochemical reactor may include a circulation conduit at least partially disposed within the tank. The circulation conduit may include a circulation inlet opening and a circulation outlet opening. The biochemical reactor may include one or more vanes disposed proximate to the circulation outlet opening. The one or more vanes may be configured to cause the immobilized carrier and the fluid exiting the circulation outlet opening to enter into a helical pattern. The biochemical reactor may include an unclogging pipe configured to clear clogging of the circulation conduit. The unclogging pipe may be disposed proximate to the circulation outlet opening. Clearing clogging of the circulation conduit may include directing a pressurized flow of air to the circulation conduit via the unclogging pipe.

The invention relates to a wastewater treatment plant, specifically a modular plant for the treatment of organic wastewater, in which the number of devices depends on the amount of water to be treated and on the quality of the starting water and that required for the water at the end of the process. The treatment plant includes multiple devices, each representing a treatment step, and the devices can be connected in series, in parallel or in series and parallel. In addition, the devices used in the process are designed to require a minimum amount of maintenance, owing to the inclusion of a self-cleaning system. Since the system requires minimal power and maintenance, it is considered optimal for use in rural communities, livestock farms or buildings.

An aim of the invention is to provide a bioreactor and a waste water treatment method that employs this tank, whereby anaerobic and aerobic microorganism treatment can be continuously carried out, even when the volume of the bioreactor is large, and whereby installation costs can be minimized. The invention comprises an outer tank (2), a cylindrical inner tank (3) disposed inside this outer tank and having openings above and below, a circulation rate control device (4) for controlling the circulation rate of water to be treated in the bioreactor, the circulation rate control device (4) being provided at an upper part of this cylindrical inner tank, a cylindrical control plate (5) for bringing about sedimentation of sludge, the cylindrical control plate (5) being provided at the outer circumference of an upper part of the cylindrical inner tank, a treated-water quality measurement device (6) that is provided outside and inside of the cylindrical inner tank, a waste water supply opening (10) that is provided in the circulation pathway of the water to be treated circulating through the outer tank and inner tank, a treated water discharge opening (11) that is provided in an upper part of the outer tank, and a sedimentation-solidification prevention device (12) for preventing sedimentation-solidification of sludge that has sedimented.

A system comprises a rotting sedimentation tank with a particulate solids filter, a distribution well, an exposed reservoir with drainage of PVC pipes and insulation of PVC foil, and an inspection well at the reservoir outlet. The reservoir is filled with layers of gravel and sand, planted with hydrophilic vegetation. The filter bed is composed of three layers, the bottom layer filled with coarse-grained oval gravel, in which the dispersal drain is at of the height connected with a supply pipe to the distribution well and terminated with the ventilation chimney, the intermediate layer filled with fine-grained oval gravel, and the top layer filled with sand, in which the collecting drain with an outlet to the inspection well is laid. The level of the sewage in the rotting sedimentation tank is located below the level of the collecting drain.

A wastewater treatment apparatus performs both initial rainwater overflow treatment and primary treatment. A wastewater treatment method according to the apparatus, the apparatus modifying an existing primary depositing reservoir to an up-flow high-speed filtration facility, the apparatus using a floating filter and biological filter paper applied to an existing depositing reservoir to perform an initial rainwater treatment. The apparatus can be applied to an existing wastewater treatment facility to eliminate the necessity of installing an additional facility for an initial rainwater treatment facility. The apparatus is further capable of adjusting the flow rate into a biological treatment facility to achieve a target water quality. The apparatus comprises: an up-flow high-speed filtration facility for filtering floating matter contained in wastewater using a floating filter; a sludge holding tank; a biological treatment facility for removing dissolved organic matter contained in the water discharged from the up-flow high-speed filtration facility; and a concentrator.

The present disclosure relates to a sewage/wastewater treatment system using granular activated sludge and a membrane bio-reactor and a sewage/wastewater treatment method using the same that are configured to effectively remove pollutants contained in raw water through a granulation tank in which the granular activated sludge is contained and to allow the raw water to be filtered through movable membranes located on the upper portion of the granulation tank. The system includes: an indirect aeration tank adapted to supply air thereto to allow dissolved oxygen contained in raw water to reach a saturation concentration; a granulation tank adapted to allow floating microorganisms contained in the treated water passing through the indirect aeration tank to be granulated and having a sludge blanket formed thereon; and movable membranes located on the upper portion of the granulation tank in such a manner as to be movable in the granulation tank.

An anaerobic digester is fed a feedstock, for example sludge from a municipal wastewater treatment plant, and produces a digestate. The digestate is dewatered into a cake. The cake may be dried further, for example in a thermal drier. The cake is treated in a pyrolysis system to produce a synthesis gas and biochar. The gas is sent to the same or another digester to increase its methane production. The char may be used as a soil enhancer.