The present invention discloses a filter material for a culture system, and a preparation method and use thereof. The filter material comprises an anode material and a cathode material, wherein the anode material is an active metal, and the cathode material is an inactive metal or a conductive non-metal. The filter material can significantly improve the water quality in the culture system, be used for in-situ treatment of the water body in the culture system and be convenient to use. The filter material does not require additional application of voltage or current, and thus is safer. At the same time, the filter material has a long service life and does not need to be changed frequently. In addition, the preparation method of the filter material is simple, efficient, and environmentally friendly, and is advantageous for large-scale production.

A method for reducing nitrates, nitrites, and/or hydroxylamine in water using a homogeneous reduced copper tetra-substituted fluorinated pinacolate ligand catalyst complex. The method includes dissolving a copper(II) tetra-substituted fluorinated pinacolate ligand pre-catalyst complex in water having an excess amount of nitrates, nitrites, and/or hydroxylamine therein. The dissolved copper(II) tetra-substituted fluorinated pinacolate ligand pre-catalyst complex in the water is subjected to electrochemical reduction to form a homogeneous reduced copper tetra-substituted fluorinated pinacolate ligand catalyst complex. The homogeneous reduced copper tetra-substituted fluorinated pinacolate ligand catalyst complex reduces the nitrates, nitrites, and/or hydroxylamine in the water to compounds with nitrogen in a lower oxidation state with the homogeneous reduced copper tetra-substituted fluorinated pinacolate ligand catalyst complex.

The present invention relates to a process for taking up one or more nitrogen oxide(s) from a gaseous and/or aerosol or liquid medium using at least one particulate earth alkali carbonate-comprising material and/or at least one particulate earth alkali phosphate-comprising material as well as an adsorbing material comprising said at least one particulate earth alkali carbonate-comprising material and/or at least one particulate earth alkali phosphate-comprising material.

The present invention relates to a method to purify nutrient-contaminated water for safe reuse or discharge, while recovering the fertilizer value of the contaminants. The core components of the invention are digestion tanks for the conversion by appropriate fauna and aerobic bacteria of dissolved or suspended organic contaminants into dissolved inorganic contaminants, which are flow-connected to biofiltration tanks for the removal by plant root uptake of dissolved inorganic contaminants. Generally, the digestion and biofiltration tanks are configured as follows: the contaminated water is conducted between one or more digestion tanks containing detritivorous or omnivorous fauna (which feed on suspended contaminants and pathogens) and naturally-occurring aerobic bacteria (which feed on the excreta of the fauna, solubilize and decompose organic contaminants, oxidize nitrogen into nitrates, and compete with pathogens), and one or more biofiltration tanks containing plants rooted in the water (which take up dissolved inorganic contaminants, primarily phosphates and nitrates).

A method of treating mining effluents containing at least one of nitrogen or cyanide species, the method comprising injecting ozone in the mining effluent in successive treatments performed at different pH. Also, a method of treating mining effluents with bromide and ozone. Also, a method of treating mining effluents containing cyanates with ozone at a relatively low pH.

Provided are catalytic assemblies which include a hollow fiber membrane permeable to a gas; a reactive coating permeable to the gas and a contaminant; and a plurality of catalytic nanoparticles embedded in the reactive coating adapted to catalyze a reaction between the gas and the contaminant. Also provided are preparation methods for the catalytic assemblies, and use thereof for treating contaminated water.

A device and method for enhancing nitrogen and phosphorus removal based on a multistage AO partial denitrification coupled with Anammox process in combination with a sludge hydrolytic acidification mixture belong to the technical field of active sludge method wastewater treatment. A system includes a water tank, a water pump, a biochemical reaction zone, a hydrolytic acidification tank and other devices. A multistage AO step-feed pipeline is used to inject raw water into the reaction zone in a segmented manner, guaranteeing efficient utilization of organic matter in the raw water; biofilm carriers are added into an anaerobic zone and anoxic zones to enrich anammox bacteria, and nitrite nitrogen produced by partial denitrification provides a substrate for the anammox bacteria to realize autotrophic nitrogen removal; a nitrification and phosphorus accumulating bacteria aerobic phosphorus uptake are performed in aerobic zones; and part of excess sludge in a secondary sedimentation tank enters the hydrolytic acidification tank to convert macromolecular organic matter into low molecular weight organic matter, a hydrolytic acidification mixture and the excess sludge in the secondary sedimentation tank synchronously flow back to the anaerobic zone, and as a high-quality carbon source, the low molecular weight organic matter can promote partial denitrification. The system provides a novel method for efficient and energy-saving treatment of municipal wastewater.

An electrochemical reduction system includes an electrochemical reduction reactor. The electrochemical reduction reactor includes a housing having an internal fluid flow-path. A cathode having an outer, reducing, reactive surface is disposed within the internal fluid flow-path. An anode having an outer, oxidizing, reactive surface is also disposed within the internal fluid flow-path. At least portions of the cathode outer, reducing, reactive surface and the anode outer, oxidizing, reactive surface are separated by an electroactive gap.

The present application provides a method for treating and recycling organic wastewater, comprising: 1) pretreating the organic wastewater; 2) subjecting an effluent obtained after pretreatment in step 1 to a heterogeneous Fenton reaction with Hangjin clay-supported nano-Fe.sub.3O.sub.4 as a catalyst, separating the catalyst from a reaction solution after completion of the reaction, and subjecting the reaction solution to a reaction to remove COD; 3) subjecting an effluent obtained in step 2 to an anaerobic ammonia oxidation reaction to denitrify by ammonia nitrogen reacting with nitrite nitrogen; 4) subjecting an effluent obtained in step 3 to an aerobic microbial decomposition and ultrafiltration membrane separation to remove COD and ammonia nitrogen; 5) filtering an effluent obtained in step 4 to remove large particles; 6) supplying an effluent obtained in step 5 to an RO system, and using an effluent from the RO system as circulating cooling water, and subjecting concentrated water from the RO system to a softening treatment; and 7) supplying softened concentrated water obtained in step 6 to an NF system for treatment, evaporating an effluent obtained after the treatment to recover NaCl, and returning a resulting concentrated water to step 1. The present application also provides a device for implementing the method for treating and recycling an organic wastewater.

Disclosed are a method and device for realizing advanced nitrogen removal of mature landfill leachate and sludge reduction by using sludge fermentation products as carbon source, belonging to the field of biological treatment of sludge of high ammonia nitrogen wastewater. The mature landfill leachate first enters a PNA-SBR, the reactor operates in an anoxic/anaerobic/oxic (A/A/O) mode, denitrification is performed at an anoxic state; then anaerobic ammonia oxidation is performed at an anaerobic stage to remove part of ammonia nitrogen and nitrite nitrogen; partial nitrification is performed at an oxic stage to remove the ammonia nitrogen; discharged water is pumped into a DN-SBR, meanwhile, an excess sludge fermentation mixture is added, the reactor operates in an anoxic/anaerobic/oxic (A/A/O) mode, organic matters in the sludge fermentation mixture are used for denitrification at an anoxic stage, and meanwhile, microorganisms store an inner carbon source; ammonia nitrogen brought by the fermentation mixture is removed at an anaerobic stage; and denitrification is performed through the inner carbon source at an oxic stage. The remarkable sludge reduction effect is achieved while a removal rate of TN achieves 96.0%, and the method and the device are suitable for advanced removal of the high ammonia nitrogen wastewater.