A method for treating wastewater or sludge comprises the steps of adding the wastewater or sludge to a reactor and mixing the wastewater or sludge with a stream to thereby decrease a ratio of alkalinity to ammonium in the reactor, the reactor containing ammonium oxidising bacteria that oxidise ammonium to produce nitrite and decrease pH.

A method, and an installation thereof, for recovering phosphorus from sludge to be treated, said method including: a stage of pre-acidification of said sludge to be treated including a step of adding an acid, preferably carbon dioxide into said sludge to be treated; a stage of bio-acidification including a step of acidogenesis and carried out in a reactor having a hydraulic retention time comprised between 1 day to 8 days and, wherein the acidified sludge has a pH comprised between 3.5 to 5.5; and a stage of treatment including: a step of solid/liquid separation; and a step of recovery of phosphates in liquid phase by sorption and/or crystallization, giving a phosphorus depleted water.

Disclosed herein is a method for remediating sewage that contains persistent contaminants. The method comprises ozofractionating the sewage under conditions whereby a foam fractionate comprising persistent contaminants is produced and separated from an ozofractionated wastewater, quiescing the ozofractionated wastewater, whereby a residual ozone content of the ozofractionated wastewater is reduced, and contacting the quiesced ozofractionated wastewater with a microorganism population under conditions effective to biologically remediate the ozofractionated wastewater.

A method for treating domestic sewage includes: preliminarily treating the domestic sewage through a grating and a grit chamber, so as to remove large-particle solids in the domestic sewage; and subjecting the domestic sewage after the preliminary treatment to circulating anaerobic-oxic treatment in a membrane bioreactor (MBR). In the oxic treatment process, microorganisms oxidize nitrogen in the sewage into nitrite or nitrate. Under anaerobic conditions, denitrifying bacteria in the microorganisms reduce the nitrate, releasing molecular nitrogen or nitrous oxide. In the present invention, the MBR is filled with a quinone-based hollow fiber membrane. During the microbial denitrification, the quinone acts as an electron transfer carrier to participate in the denitrification to promote the reduction of the nitrate (nitrite), increasing the denitrification rate under anaerobic conditions, and achieving the purpose of efficient denitrification.

A process for enriching phosphorus and recovering vivianite by a biofilm method includes the following steps: 1) an aerobic phosphorus absorption stage; 2) an anaerobic phosphorus release stage; 3) a cyclic enrichment stage; 4) a seed crystal forming stage; and 5) a crystal forming stage. Phosphorus is enriched by the biofilm method and recovered with vivianite as a recovery product, which solves the problem of phosphorus removal from municipal sewage and improves the economic value; by preparing high dissolved oxygen at the aerobic stage, a high-concentration phosphorus recovery solution can be obtained with a relatively low carbon-phosphorus ratio and relatively high enrichment times, and the consumption of carbon sources can be reduced; since the oxidation-reduction potential is controlled to be less than −100 mv by the biofilm method at the anaerobic phosphorus release stage, the oxidation-reduction potential does not need to be adjusted again during the recovery of vivianite,

The Fischer-Tropsch (FT) process creates significant amounts of water. The invention provides an aqueous composition comprising specified amounts of dissolved and suspended solids, low chemical oxygen demand and low chlorine demand, pH in the range of 6.5 to 8.0, where the aqueous composition comprises organic carbon derived from fossil sources.

A method of treating oil and gas produced water may include: receiving produced water from one or more wells; separating an aqueous portion of the produced water from oil and solids included in the produced water in order to provide recovered water; performing anaerobic bio-digestion of organic matter included in the produced water using a biomass mixture of anaerobic bacteria obtained from a plurality of wells; aerating the recovered water in order to promote metal precipitation; and performing aerobic bio-digestion of organic matter present in the recovered water. Some embodiments may also include one or more of anoxic equalization, filtration, pasteurization, reverse osmosis, and biocide treatment of the recovered water. The recovered water may be used for oil and gas well fracking and/or land and stream application. Other methods of treating oil and gas produced water are also described.

TA method for treating an aqueous solution containing ammonium perchlorate and optionally nitrate ions, the method having a nitrification/denitrification sequence then a step of reducing perchlorates, the liquid effluent obtained at the end of this step of reducing perchlorates being subjected to a first membrane filtration, the liquid effluent obtained following this first membrane filtration being put into contact, in a reactor in aerobic conditions, with microorganisms able to carry out the oxidation of organic materials, then the liquid effluent leaving this reactor being subjected to a second membrane filtration, the first membrane filtration and the second membrane filtration being carried out on the same membrane filtration unit.

The present disclosure belongs to the technical field of treating landfill leachate, and in particular to a system and a method for total volume treatment of landfill leachate, and a use thereof. The system comprises an integrated device of dielectric barrier discharge combined with catalyst treatment, an SBR-MBR biochemical treatment device and a PLC control device; the integrated device for a discharge barriered by dielectric and a catalysis treatment is communicated with the SBR-MBR biochemical treatment device through a water transport pipeline, and the PLC control device is respectively connected with the integrated device for a discharge barriered by dielectric and a catalysis treatment and the SBR-MBR biochemical treatment device through connecting lines.

In an apparatus for treating wastewater, water is screened, biologically treated and coagulated with the addition of chemicals before it is drawn through a membrane filter to produce permeate that is then passed through an electro-chemical cell to coagulate and/or oxidize residual contaminants such as phosphorous, nitrogen, or ammonia, and is then passed through a secondary membrane filter to capture and remove any remaining contaminants.