Abstract: A tank is disclosed as having a tub therein that divides the volume of the tank into an anoxic chamber inside the tub and an equalization chamber outside of the tub. The anoxic chamber anoxically treats wastewater while the equalization chamber equalizes fluctuations in wastewater influent as well as provides a holding space for wastewater if power to the tank is cut off. The tank can be part of a system for treating wastewater, such as one with an anaerobic tank having an anaerobic chamber for anaerobically treating wastewater, an aerobic/filtration tank having a filtration sub-tank therein that divides the volume of the tank into a filtration chamber inside the sub-tank and an aerobic chamber outside of the sub-tank. The aerobic chamber can aerobically treat wastewater while the filtration chamber has a membrane unit for filtering wastewater.

Abstract: Provided is a water treatment module including a bundle of hollow fiber membranes that includes a treatment portion extending between bottom and top ends and at least one gas diffuser. The membranes may be gas permeable and water impermeable. At least one end of the hollow fiber membranes is linked to a source of biofilm growth-supporting gas (BGSG) and configured to permit inlet of said BGSG into the hollow fiber membranes. Also provided herein are devices, systems and methods making use of the module.

Abstract: Disclosed is a composite filter media. The composite filter media is formed from multiple layers of media material including a nanofiber media layer, where the layers are laminated, bound, or otherwise composited to each other. The composite filter media can comprise at least one nanofiber layer comprising polymeric media material having a geometric mean fiber diameter of about 100 nm to 1 ?m, and fibers configured in a gradient such that ratio of the geometric mean diameter of fibers at the upstream face of the nanofiber layer to the geometric mean diameter of fibers at the downstream face of the nanofiber layer is about 1.1 to 2.8, preferably about 1.2 to 2.4.

Abstract: A membrane photobioreactor for treating nitrogen and phosphorus that are out of limits in a biogas slurry and treating method thereof, relating to biogas slurry treatment. The membrane photobioreactor for treating nitrogen and phosphorus that are out of limits in a biogas slurry is provided with a biogas slurry storage tank, peristaltic pumps, a microalgae cultivating tank, an air pump, a membrane photobioreactor and a hollow fiber membrane.

Abstract: A drain assembly for being placed inground includes a first panel and a second panel spaced-apart from the first panel, a plurality of supports extending between the first panel and the second panel, a bottom or pipe extending between a bottom portion of the first panel and the second panel, and a cap extending between a top portion of the first panel and the second panel. The first panel may define a plurality of drainage apertures. A related method is also provided.

Abstract: A separation tank for crude oil. Fluid enters an inlet section of a center column of the tank via an offset inlet pipe so the fluid enters swirling. Solids that settle in the inlet section are removed by a center column drain and a solids removal system. Free gas rises and exits from the top of the tank. Liquid flows out of the center column via a diffuser that spirals the fluid evenly toward the wall of the tank where oil coalesces and wicks upward. Liquid flows downward around two flow diverting baffles where more oil coalesces and wicks upward via an oil conduit into the oil layer. The water flows under the lower flow diverting baffle and exits the tank through the outlet section. A large circular oil collector weir uniformly removes oil from the oil layer. Interface draw offs located below the oil-water interface remove excess BS&W.

Abstract: A wastewater treatment system is provided having a pretreatment tank which receives wastewater from a wastewater source, and an aeration tank which is in fluid communication with the pretreatment tank. A recirculation pump is carried in the aeration tank and returns wastewater from the aeration tank to the pretreatment tank. The recirculation pump returns the wastewater according to a recirculation ratio R:I where R is the volumetric flow rate of wastewater through the recirculation pump and I is average volumetric flow rate of wastewater entering the pretreatment tank. A control panel cycles the recirculation pump on and off according to the recirculation ratio.

Abstract: A filtration filter comprises a metallic mesh having a circumferential shape and radially inner and outer portions. The metallic mesh is adapted to filter out a filtration target object contained in a fluid passing through the membrane. First and second frame members hold the outer portion there between so as to create first and second bent sections separated by a transition section extending between the first and second bent sections. The transition section includes at least one streaked projection.

Abstract: A subsurface sewage disposal system includes leaching members oriented substantially vertically and positioned in a non-linear arrangement. A first volume is defined within the leaching members by a permeable enclosure configured to provide temporary storage of an effluent introduced by a distribution pipe. A plurality of balancing pipes is configured in a non-linear arrangement to redistribute the effluent from one leaching member to another leaching member. As the effluent rises within one leaching member, the effluent is redistributed by the balancing pipes to another leaching member. In the event of a failure of the distribution pipe, the plurality of balancing pipes is configured to bypass the distribution pipe and redistribute the effluent to the leaching members downstream of such failure.

Abstract: A method for appropriately controlling an aeration volume for activated sludge on which aeration treatment is conducted while DO of an activated sludge mixed liquor in an aeration tank is being adjusted to substantially 0 mg/l (ultralow DO treatment). The method includes the following steps. An aeration volume correlation (G=F(Gr)) between an aeration tank and a measuring device is acquired in advance. A sample of activated sludge mixed liquor taken during ultralow DO treatment operation is temporarily intensely aerated in the measuring device and then aeration is stopped. Based on temporal changes in the measuring device DO value, an oxygen consumption rate Rr and an equilibrium DO value C1 are calculated. An appropriate aeration volume G2* of the testing device is acquired by using an Ea?G relationship formula and the like obtained in advance. An appropriate aeration volume Gr2* of the aeration tank is obtained by using the relationship G=F(Gr).

Abstract: Disclosed herein is a device for improving the quality of rainwater/stormwater by removing pollutants therefrom. The device comprises a substantially cylindrical tank having an inlet for entry of water and an outlet for discharge of water. A coarse filter is provided in the tank for filtering gross pollutants from inflowing water, the coarse filter dividing the tank into an upstream first region/chamber and a downstream second region/chamber. A fine pollutant discharge opening is located between the coarse filter and the outlet. A valve comprising a valve member for opening and closing the fine pollutant discharge opening is configured to automatically open the fine pollutant discharge opening to discharge an initial volume of the water passing the coarse filter, the valve member being biased toward a configuration for closure of the fine pollutant discharge opening during an inflow event. The water passing through the fine pollutant discharge opening bypasses the outlet.

Abstract: A system and method are provided for controlling fouling and complement protein activation during separation of plasma from whole blood using a spinning membrane separator. The separator includes a pair of relatively rotating surfaces spaced apart to define a gap therebetween, with at least one of the surfaces comprising a membrane that allows plasma to pass therethrough but substantially prevents the passage of red cells. In accordance with the method, the membrane material and membrane fabrication technique are selected so as that the resulting membrane both resists fouling and complement protein activation. In a specific embodiment, the membrane is has a smooth surface and substantially linear pores. The pores have a nominal diameter of less than 2 microns (so as to exclude platelets) and preferably a diameter of from 0.6 microns to 0.8 microns, as may be obtained by use of track-etching.

Abstract: A spiral wound membrane module adapted for hyperfiltration and including at least one membrane envelope and feed spacer sheet wound about a central permeate tube to form an inlet and outlet scroll face and an outer periphery, wherein the feed spacer sheet includes: i) a feed entrance section extending along the permeate collection tube from the inlet scroll face toward the outlet scroll face, ii) a feed exit section extending along the outer periphery from the outlet scroll face toward the inlet scroll face, and iii) a central feed section located between the feed entrance section and the feed exit section; and wherein the feed entrance section has a median resistance to flow in a direction parallel to the permeate collection tube that is less than 25% of the median resistance to flow of the central feed section in a direction perpendicular to the permeate collection tube.

Abstract: A microorganism concentrator includes a water storage part that stores water sample therein and a filter that partitions the water storage part into a supply side and a drain side for the water sample. The microorganism concentrator concentrates microorganisms that are too large to pass through the filter on the supply side by moving the water sample on the supply side to the drain side of the water storage part. In the microorganism concentrator, the filter is arranged in such a way that no vertically downward force is applied to a surface of the filter on the supply side.

Abstract: A power steering tank baffle includes a filter member, a hood member and a rib member. The filter member includes an inflow portion and an outflow portion, the inflow portion including a first plurality of openings and a second plurality of openings. The hood member is disposed over the inflow portion. The rib member connects the filter member and the hood member, the rib member being disposed on the inflow portion so as to separate the first plurality of openings and the second plurality of openings.

Abstract: A chromatography column distribution system includes a set of first bed support ribs extending radially from an inner, first radial position near the center of the plate to an outer radial position nearer to the periphery of the plate and at least one set of intermediate bed support ribs starting at an intermediate radial position and extending to an outer radial position nearer to the periphery of the plate. Channels are formed between adjacent bed support ribs. The desired local effective channel height varies in accordance with a predetermined formula from the first radial position to the outer radial position. The transverse cross-sectional areas of the ribs or the channels are adapted such that the actual local effective channel height is within 15% of the desired local effective channel height over portions of the distribution system situated between the first radial position and the outer radial position.

Abstract: A filter system has a filter element in a filter housing having a coupling device configured to detachably couple and mount the filter system onto a receiving member external to the filter system. The coupling device has one or more inwardly projecting coupling elements which lockably engage with coupling contours of the receiving member by a sliding-rotating movement.

Abstract: A device for controlling injection of chemical into a boiler and a chemical injection method can control an injection amount such that a chemical concentration is obtained as per a target even in a boiler feed-water facility where a flow rate of feed-water varies to a large extent in a short period. The device controls an amount discharged by a chemical injection pump in proportion to a flow rate measured by a flowmeter. An average chemical concentration in a feed-water is calculated from an amount of feed-water per predetermined period obtained by the flowmeter and a reduction in the amount of chemical in a tank per predetermined period obtained by a sensor. The chemical injection pump is controlled on the basis of the calculated average chemical concentration and a preset target chemical concentration of the feed-water so that the average chemical concentration is within the target chemical concentration range.

Abstract: Media beds containing worms living in an oxygenated aqueous environment are provided for the remediation of water containing excreted and other oxidizable organic or chemical waste. The media beds may include cultivated plant life in addition to the cultivated worm population for the uptake of nitrates, as well as other nutrients rendered soluble through digestion of the worms to remediate water to levels sufficient to be safely returned to the environment; alternatively the water may be remediated to higher nitrate levels in the absence of plants so that the water can be used in subsequent fertilization operations outside the waste treatment system. The system further includes cultivated microbial populations that may be present in the media beds and/or in separate bioreactors within the system.

Abstract: A functional polymer membrane including a porous support and a crosslinked polymer electrolyte, in which the film thickness of the functional polymer membrane is smaller than 100 ?m, the crosslinked polymer electrolyte is a crosslinked polymer formed by subjecting a composition including a monomer having a (meth)acrylamide skeleton to a polymerization curing reaction, and the proportion of elemental oxygen in the elemental composition excluding elemental hydrogen and helium at the surface of the porous support is from 14.0 atom % to 25.0 atom %; and a method for producing the same are provided.