An integrated method for clearance, collection and capture of internal pollutants and algae at the bottom of a lake include the following steps: selecting areas where the pollution level is high, and organic or inorganic particulate matter is prone to accumulation and carrying out trenching operations at the bottom of the lake to form a plurality of traps; and removing the sludge and algae inside the traps and clearing the sediment inside the traps, for subsequent internal pollution control when the surface-layer sludge on both sides of the traps almost fills up the traps. This method makes use of the hydrodynamic disturbances of waves formed by natural wind energy and lake currents to continuously transport sludge with a high pollution level and a small specific gravity and algae in the surface layer of the lake bottom, which are rich in organic debris, to artificially built traps.

An ion separation device for water body based on water jet vortex includes: a separation tank assembly including a tank and a water outlet pipe disposed in the tank, a collection separation plate and an impurity separation plate are disposed in the tank, and an inner space of the tank is divided into a collection region, a separation region, and an impurity region; and a first water delivery unit and a second water delivery unit. The first water delivery unit and the second water delivery unit are configured to generate high-pressure water flow and deliver the high-pressure water flow into the tank from two sides of the tank to generate a vortex in a water body and thus generate a centrifugal force, so as to make macromolecular impurities and metal ions in the water body be thrown away from a center of the tank.

In a method for extracting boron from feed water, a backwash operation is performed on a boron-saturated resin bed within a pressurized vessel, wherein the resin bed includes boron-selective resin for extracting boron from the feed water. An acid-based solution is injected into the boron-saturated resin bed, causing the boron to be released from the resin bed and into a boron solution. The boron solution is drained from the pressurized vessel into a holding tank. An acid displacement rinse operation is performed on the resin bed. A caustic solution is injected into the resin bed, the caustic solution recharging the resin bed for extracting the boron from the feed water. A caustic displacement rinse operation is performed for preparing the resin bed for receiving the feed water. Surplus water of the acid displacement rinse operation and the caustic displacement rinse operation are distributed to a source of the feed water.

The present invention belongs to the technical field of water treatment, and in particular to a magnetic powder strengthened method for removing nitrate nitrogen and inorganic phosphorus, which includes the following steps: (1) mixing permanent magnetic material powder with paramagnetic Fe3O4 powder, and magnetizing the mixture in a magnetic field to prepare magnetic powder; (2) adding the magnetic powder directly or in a form of granular filler into a water treatment reaction vessel; and (3) allowing the to-be-treated water to enter the water treatment reaction vessel, performing a chemical reaction of removing nitrate nitrogen and inorganic phosphorus in the presence of a reducing agent, and discharging the water after the reaction is completed. By adopting the method of the present invention, a uniform and fine magnetic field can be provided, thus the reaction efficiency is improved, and the process is simplified and the cost is lowered.

A method is described for using basalt to selectively adsorb organic toxic materials, such as dioxins, furans, polychlorinated biphenyls (PCBs), bis(2-ethylhexyl)phthalate, arsenic, mercury, chromium, copper, nickel, zinc, cadmium, lead, and the like, from substances such as sediment, which contains water and the toxic materials. Optionally, the basalt may be in the form of a liner, a cap, or a filter that surrounds, contains, or contacts sediment contaminated with the organic toxic material(s).

The present invention provides systems and methods for concentrating and recovering phosphate from samples. The method comprises using immobilized PBP for binding phosphate and a desorption solution having a pH of 11 or greater to recover phosphate from a sample when the phosphate is found at very low detection levels. Further systems and method for removing arsenate for water sources is also provided.

A treatment device for treating a mixture of at least a liquid, organic solids and inorganic, mineral solids, includes a container for receiving the mixture. The container tapers in a funnel shape in a direction of a longitudinal axis of the container. An inlet tangentially supplies the mixture to the container. An outlet discharges the liquid essentially containing the organic solids from the container. A discharge apparatus serves for discharging the inorganic, mineral solids. The treatment device also includes a sleeve adapted to guide the mixture between an outer wall of the sleeve and an inner wall of the container and to guide the liquid containing the organic solids within an inner wall of the sleeve for discharge from the outlet.

A wastewater treatment device has: an ozone generator which supplies ozone; a mixer which mixes ozone supplied from the ozone generator with wastewater and supplies ozone mixed wastewater; an ozone oxidation unit which progresses ozone oxidation in the ozone mixed wastewater while passing the ozone mixed wastewater therethrough and discharges wastewater in which the ozone has been consumed; a biological treatment unit which performs biological treatment on the wastewater discharged from the ozone oxidation unit using microorganisms; and an adjusting device which adjusts the amount of ozone to be mixed with the wastewater by the mixer so that ozone in an amount that inhibits the microorganisms of the biological treatment unit does not remain in the wastewater discharged from the ozone oxidation unit.

A process of treating nano-filtration membrane retentate comprises introducing seawater comprising a sulfate ion concentration of greater than or equal to 3000 mg/l to the NF membrane to produce a retentate stream and a permeate stream, wherein the retentate stream has a sulfate ion concentration greater than or equal to 10,000 mg/l, and mixing barium additives comprising barium chloride dehydrate (BaCl.sub.2.Math.2H.sub.2O), barium chloride (BaCl.sub.2), or both with the retentate stream to precipitate sulfate from the retentate stream to form barite (BaSO.sub.4) and reduce the sulfate ion concentration, wherein the barium additives are added into the retentate stream at a barium ion concentration of greater than 10,000 mg/l.

The subject of this invention is to use beneficial reactive support media in the form of reactive support bases or stratums that provide structural or biochemical benefits to the growth or function (including agglutination) of biofilms. The functional aspect includes the provision of a polymeric, cellulosic or silicic framework. The framework could also contain charge moieties such as cations, anions, amines or carboxyl groups whose pKa's allow them to be charged at the physiological pH for an organism. For example, a cation may provide a positive charge to help the adherence of a negative charge exocellular polymeric substance. The reactive support media may include biodegradable or refractory plastics, alginates or uronic acids or extracted bacterial EPS. These materials are reacted, retained or removed based on their physical characteristics.