A method is presented for biological removal of contaminants like sulfide from ground waters and industrial waters. A fixed film compartmentalized bioreactor or bioreactors are used to convert sulfide to elemental sulfur and the subsequent conversion of the elemental sulfur to sulfates. The present invention uses a packed bed bioreactor configuration that uses packing material to maximize the concentration of sulfide oxidizing bacteria.

In an embodiment, the present invention provides a method for the biological cleaning of wastewater in an activated-sludge plant including at least one activated-sludge tank, the method including: contacting, in the plant, the wastewater with activated sludge in the activated-sludge tank so as to clean the wastewater; and after the cleaning of the wastewater, separating, in the plant, the suspended activated sludge from the cleaned wastewater by sedimentation in a secondary clarification tank downstream of the activated-sludge tank or in the activated-sludge tank. The activated sludge suspended in the wastewater is admixed with growth bodies in the activated-sludge tank in order to contact the growth bodies with the microorganisms present in the activated sludge and to bring about formation of a biofilm of microorganisms on the growth bodies.

The invention discloses an apparatus for sewage deep denitrification with high pollutant carrying capacity and low energy consumption and a method for running the same, characterized in that: the apparatus mainly includes a settling tank, an electrodialysis device, a pH adjusting tank, a first chemical storage tank, a biofilters a second chemical storage tank, a redox potential measuring device, a backwash pump, and a clean water tank, wherein the biofilter is provided with, a gas collecting device, an uniform water distributor, a first filter bed, a second filter bed, a third filter bed, and a fourth filter bed sequentially from up to down, a second dosing port is arranged underneath the second filter bed, and the second chemical storage tank is communicated to the second dosing port respectively through a first flow path and a second flow path.

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.

A method and a system as described herein, including a method and system of treating ammonium containing water in a deammonification MBBR process where partial nitritation and anaerobic ammonium oxidation may occur simultaneously in a biofilm, or in an integrated fixed film activated sludge process where partial nitritation takes place in a suspended growth fraction and anaerobic ammonium oxidation occurs in a biofilm. The method and system include controlling airflow to the reactor to achieve a target pH, a target alkalinity, a target specific conductivity, and/or a target ammonium concentration in the reactor or in the effluent.

A gas supply body for use in a wastewater treatment apparatus for purifying wastewater using action of microorganisms in the wastewater, the gas supply body comprising: a gas delivery layer and a sheet laminate, wherein the sheet laminate comprises a base material that is a microporous membrane comprising a plurality of fine through holes penetrating therethrough in a thickness direction, and a gas-permeable non-porous layer, wherein the gas delivery layer, the base material, and the gas-permeable non-porous layer are arranged in this order, and wherein the base material has a pore size of 0.01 m to 50 m. A method for producing a bag for a gas supply body disposed in a wastewater treatment apparatus comprising a sheet laminate.

A process in which a waste stream containing microbes and organic constituents is passed through a process environment comprising a solid media, microbes, and higher animals, such that some of the microbes and/or organic constituents within the waste stream are removed from the waste stream and some of the removed microbes are destroyed or consumed by the higher animals. The process environment may include an irrigated environment, a submerged environment, or a combined environment.

A modular liquid waste treatment system is disclosed. In accordance with some embodiments, the system includes a central distribution unit and one or more treatment fins in flow communication therewith. The distribution unit may be configured to receive liquid waste from a given source and distribute that waste, at least in part, to one or more treatment fins. In turn, bacteria present in a given treatment fin treat the liquid waste, and the resultant treated liquid may drain from the fin to the surrounding environment. In some embodiments, a given treatment fin may include porous media providing a large surface area on which bacteria may grow to facilitate treatment. The system may be installed in and/or above the ground, and in some cases may be surrounded, at least in part, with treatment sand and/or other treatment media. The system may be used in aerobic and/or anaerobic processing of liquid waste.

A biofiltration system for filtering wastewater includes a tower containing a packed bed on which biofilm is able to form and an air inlet below the packed bed and an air outlet above the packed bed. A water feed above the packed bed disperses wastewater over the packed bed. The biofilm serves as a biological contact reactor removing organic and/or inorganic contaminants from the water. Following filtration of the water through the packed bed, filtered water and solid waste sloughed off from the packed bed collects in a sump below the packed bed. Water flows from a water outlet in the sump to a centrifugal separator that separates solid material from water drawn from the sump to expel a waste stream and a filtered water stream.

The aspects of embodiments of the invention relate to advanced bioelectrochemical systems. More specifically, the invention relates to the utilization of a power source such as, but not limited to, photo-active, semiconducting materials, batteries, or the like integrated with bioelectrochemical systems perhaps to increase oxidation and/or reduction reactions, which can be applied to the treatment of pollutants environmental media such as but not limited to water, wastewater, soil, and other water-containing environment.