Disclosed is a water treatment device such as a water purifier. In particular, a water treatment device capable of producing sterilizing water is disclosed. The device includes a sterilizing water producing module for electrolyzing raw water to produce sterilizing water, wherein the sterilizing water producing module includes a plurality of first electrodes and a plurality of second electrodes arranged alternately with each other and spaced from each other, wherein the first and second electrodes have opposite polarities to each other, wherein a polarity of each of the first electrode and the second electrode is switchable to between a positive potential and a negative potential, such that the sterilizing water producing module operates such that a positive potential operation and a negative potential operation are alternately repeated, wherein a magnitude of voltage or current applied to the sterilizing water producing module under the negative potential operation is smaller than a magnitude of voltage or current applied to the module under the positive potential operation.

A water intake and pretreatment system (10) comprising an inlet for delivering water from a natural source to a reservoir (12); said inlet to reservoir having a net screen (16) to prevent entry of organisms above a predetermined size and including a one-way gate (30) to allow organisms to exit the reservoir; said reservoir further comprising a granular filter media for water and algae filtration; and a drainage layer for removal of filtered water from the granular filter media to a drainage outlet. A local backwashing apparatus 40) is included for localized backwashing of the granular filter media.

A fluid treatment system is provided. A clarification reactor or chamber, configured for receiving an influent, is provided wherein separated water and separated solids may be formed from the influent while inside and/or outside the reactor. An influent inlet, positioned essentially at the top of the reactor, configured to allow the influent to enter the reactor is provided. A separated water outlet is provided, positioned essentially at the top of the reactor, that is configured to allow the separated water to exit the reactor. A solids discharge is also provided, positioned essentially at the bottom of the reactor, that is configured to allow the separated solids to exit the reactor. A downward angled baffle, positioned inside the reactor, is configured to deflect the separated solids towards the solids discharge.

A water purifier includes a filter head, a flow channel control module, and a filter element. The flow channel control module includes a waterway board and a flow manifold. The waterway board is provided with a water flow channel. The flow manifold is provided with a first passage and a second passage. When the flow manifold is driven by the filter element and rotated relative to the waterway board to a first position where the first passage is connected to the water flow channel, the flow channel control module is switched to a first flow channel waterway mode (or filter mode). When the flow manifold is driven by the filter element and rotated to a second position where the second passage is connected to the water flow channel, the flow channel control module is switched to a second flow channel waterway mode (or replacement mode).

An apparatus for degrading the organic fraction of sewage by means of active biomass, in particular active sludge particles, comprising: —at least one tank (1) adapted to contain the sewage and said active biomass; —at least one hollow structure (6, 106, 206), adapted to be at least partially immersed in the sewage, provided with at least one first opening (61) for letting in the sewage and with at least one second opening (62) for letting out the sewage, wherein the ratio between the area of the at least one first opening (61) and the area of the at least one second opening (62) is equal to at least 5:1; —air delivery means (7, 70) adapted to introduce air inside said at least one structure (6, 106, 206); wherein said at least one first opening (61) is proximal to said air delivery means (7, 70) and said at least one second opening (62) is distal from said air delivery means (7, 70), so that the air delivery means (7, 70) are adapted to generate a flow of sewage from said at least one first opening (61) to said at least one second opening (62).

Methods and systems for removing pollutants from water include one or more filter systems and a hybrid wetland system. Hybrid wetland systems may include a first pipe transporting water from a body of water to a settling tank, a first constructed wetland connected to the settling tank via a second pipe, and a first filter system removing pollutants from water passing through the second pipe. A second filter system is positioned within the first wetland to further remove pollutants. The system also includes a second constructed wetland connected to the first constructed wetland via a third pipe and a water control chamber. Filtered water exiting the first constructed wetland flows through the water control chamber, through the third pipe, and into the second constructed wetland. A fourth pipe extends between the second constructed wetland and the body of water, returning filtered water to the body of water.

A filter cartridge (5) with a housing enclosing a filter volume filled to about 80% with a filter granulate (15) is screwed into a joint (7) of a connecting piece (1) by means of a port (12) ending in an outflow opening (13) and being connected to an outlet line formed by a second fitting (3), and surrounded with a distance by a casing (4) that is screwed to the connecting piece (1). An inlet line formed by a first fitting (2) opens into an intermediate volume (6) lying between the casing (4) and the outer side of the filter cartridge (5) in such a way that untreated water enters into the outlet line via the intermediate volume (6) and through the bottom (9) which is perforated by slots (10), the filter granulate (15), the intermediate floor (11) that is likewise slotted and the port (12). In order to reduce the flow resistance, the port (12) is provided with bypass openings (14) to allow untreated water to pass also directly out of the intermediate volume (6) into the port (12).

The present invention relates to an apparatus for biological sewage treatment, including a concentrated mixed liquor driving device that uses a gas to drive a concentrated mixed liquor to flow. The present invention further relates to a method for biological sewage treatment, including a step of using a gas to drive a concentrated mixed liquor to flow. The gas can be an aeration gas, especially an oxygen-containing aeration gas after aeration treatment. The apparatus and method of the present invention can sufficiently utilize the energy and oxygen of the aeration gas, so that the energy consumption and maintenance cost of whole apparatus are reduced, biological sewage treatment effects are improved, and sludge floating is prevented. In addition, the apparatus of present invention has advantages of high performance, energy saving, high reliability, and good movability.

A device for detecting the presence of hydrocarbon fluid in runoff water includes an outer canister and a cartridge situated within the outer canister. The cartridge includes a pre-filter, at least one containment vessel, a diffuser/separator member situated within the containment vessel, a hydrocarbon fluid accumulator and an electronic circuit. The diffuser/separator member slows the flow of runoff water entering the containment vessel so that oil in the runoff water separates from and rises to the surface of the water where it accumulates in the hydrocarbon fluid accumulator. A sensor situated in the hydrocarbon fluid accumulator detects the accumulated oil and sends a signal to the electronic circuit which, in turn, closes a valve and prevents water from flowing through an egress opening in the outer canister.

A fluid sterilization apparatus includes: a flow passage tube in which a processing passage where a passing fluid is sterilized is formed; a first light source that irradiates the processing passage with ultraviolet light; an inflow passage formed in a direction that intersects an outer circumferential surface of the flow passage tube; and a communication passage that causes the inflow passage to communicate with the processing passage. The communication passage has a narrow passage in the middle of a path from the inflow passage toward an opening of a first end, the narrow passage being narrower than a passage toward the inflow passage.