The present invention relates a method for early warning analysis of eutrophication of a designed artificial water body, comprising: establishing a three-dimensional model of the designed artificial water according to the data corresponding to a planning scheme of the water body, wherein the three-dimensional model of the designed artificial water body comprises at least the designed artificial water body and surrounding buildings; according to the three-dimensional model of the designed artificial water body, analyzing the designed artificial water body through an ecological simulation technology to obtain at least one of the analysis results including hydrological mobility, hydraulic retention time, algal community composition of source water, designed water depth, water body surface wind field, solar radiation and temperature of the designed artificial water body; and assessing the risk of eutrophication of the designed artificial water body according to at least one of the analysis results of the ecological simulation.

A swimming pool skimmer comprises a buoyant skimmer body. The swimming pool skimmer further comprises an electrical power supply including a solar cell mounted to a topside of the skimmer body. A set of proximity sensors are operatively connected to the electrical power supply, and are mounted at a forward end of the skimmer body. The set of proximity sensors are configured to generate a signal in response to detecting an obstruction. A set of pump jets are operatively connected to both the electrical power supply and the set of proximity sensors. The set of pump jets are configured to activate in response to the signal from the set of proximity sensors, thereby rotating the swimming pool skimmer away from the obstruction.

A method for treating wastewater is disclosed. The method is useful in particular for treating wastewater that is generated from the process of drilling, hydraulic fracturing and/or cleaning a bore of an oil or natural gas well bore. The method may include performing cold lime softening of the wastewater to form waste salt flocs, filtration of waste salt flocs, ozonation of the filtrate from the filtration, and reverse osmosis of the filtrate to produce a purified permeate.

A system and method for backwashing a sand filter in a wastewater treatment system. In one aspect, the invention can be a system for backwashing a sand filter comprising: a sand filter configured to remove solids from an untreated wastewater; a container storing chlorine fluidly coupled to the sand filter by a chlorine supply manifold; a flow control mechanism positioned on the chlorine supply manifold between the container and the sand filter, the flow control mechanism alterable between a first position whereby chlorine cannot flow from the container to the sand filter and a second position whereby chlorine flows from the container to the sand filter, the flow control mechanism being biased into the first position; and a processor operably coupled to the flow control mechanism and configured to automatically actuate the flow control mechanism into the second position upon detecting that the sand filter is being backwashed.

Systems and methods are described for treating flue gas, for example from a coal fired power plant. The systems and methods include control of a wet flue gas desulfurization (WFGD) system to manage sulfite concentration in a slurry produced by the WFGD system. Oxygen is added to the slurry in an amount sufficient to produce a sulfite concentration in the slurry in the range of about 5 to 75 mg/L, an oxidation reduction potential in the range of about 100-250 mV, or both. The systems and methods also include the biological treatment to remove selenium from a liquid fraction of the slurry. The liquid fraction is treated in a biological reactor maintained under anoxic or anaerobic conditions to reduce its selenium concentration.

The efficiency of water disinfection can be significantly increased by supplying the ozone in combination with oxygen to an inlet of a cavitation pump. The ozone and the oxygen are turned into ultra-fine bubbles via cavitation action within the pump, facilitating the dissolution of the oxygen and ozone within the water. The water mixed with the oxygen and the ozone is subsequently supplied to a line atomizer, where the dissolution of the ozone within the mixture is completed. The combined use of the cavitation pump and the line atomizer can lead to a substantially complete dissolution of the supplied ozone within water that needs to be disinfected, allowing to easily achieve the concentration of ozone necessary for water disinfection. Due to this efficiency, the system and method described are highly scalable and suitable for water purification at water purification plants of various sizes.

The present invention discloses an advanced oxidation process of degrading nonsteroidal anti-inflammatory drugs in sewage by UV persulfate. The sewage flows to a secondary sedimentation tank by gravity, and sediments are precipitated and separated. Na.sub.2S.sub.2O.sub.8 solution is added therein, and a UV lamp is opened. Effluent result is analyzed after photooxidation. The sewage is transferred into a contact disinfection pool to react with ClO.sub.2 before discharging safely. The present invention uses a UV-based advanced oxidation process, which can effectively remove the nonsteroidal anti-inflammatory drugs in sewage, meets the requirements of sewage discharging, and decreases the environmental risk of nonsteroidal anti-inflammatory drugs. The method has some advantages such as simple equipments, easy operation, reasonable economy, as well as efficient treatment effect and high stability.

The present invention relates to a system and a method for abating the presence of a selected chemical substance in wastewater flowing in a wastewater channel system from an upstream position to a downstream position. The method typically comprising dosing into the wastewater, at the upstream position, chemical agent(s) adapted to abate the presence of said selected chemical substance, wherein the dosing is in an amount set by a dosing set-point, and adjusting the dosing set-point based on determinations of the concentration of the selected chemical substance at the downstream position. The invention involves comparison between a determined concentration and a pre-selected fractile and adjusting a dosing set-point based thereon.

A process for optimizing the operation of a plug-flow fermenter for the anaerobic fermentation of organic wastes, wherein the plug-flow fermenter comprises a horizontally oriented fermenter tank and a stirrer, which stirrer comprises a stirrer shaft which traverses the interior of the fermenter tank in an axial manner and multiple paddles which are arranged on the stirrer shaft and protrude radially and also a drive, and the fermentation material is moved in the fermenter tank by means of the stirrer.

A swimming pool skimmer comprises a buoyant skimmer body. The swimming pool skimmer further comprises an electrical power supply including a solar cell mounted to a topside of the skimmer body. A set of proximity sensors are operatively connected to the electrical power supply, and are mounted at a forward end of the skimmer body. The set of proximity sensors are configured to generate a signal in response to detecting an obstruction. A set of pump jets are operatively connected to both the electrical power supply and the set of proximity sensors. The set of pump jets are configured to activate in response to the signal from the set of proximity sensors, thereby rotating the swimming pool skimmer away from the obstruction.