An apparatus for separating out and removing screenings from wastewater includes a screening device having a screen surface through which the wastewater flows during operation of the screening device and screenings carried along in the wastewater are at least intermittently retained. The apparatus includes a sensor and a controller. The sensor monitors the screenings in the area upstream from the screen surface and/or in the area of the screen surface. The controller outputs a message when the screenings have one or several properties which have been defined and have been recognized by the sensor. In addition, a method for operating the apparatus and a system including the apparatus are provided.

A grid bar for a screen grid of a screen includes a multiple number of grid bars arranged next to each other and spaced apart from each other, which serves the purpose of separating screening material from a flowing liquid, such as wastewater flowing in a sewer channel. The grid bar includes a plastic reinforced with fibers, whereas at least a part of the fibers extend in a longitudinal direction of the grid bar. A screen includes such a screen grid.

A river course ecological treatment system for use in a river includes a plurality of plastic retaining dams disposed in the river that receive and divide the river course into sequential retaining regions arranged in a direction from upstream to downstream; a plurality of ecological biological water purification systems disposed in the sequential retaining regions and each ecological biological water purification system being located between any two adjacent plastic retaining dams of the plurality of plastic retaining dams to purify water within the sequential retaining regions and discharge purified water; and at least one damp land ecological water purification system that is disposed beside the river and that includes a rainwater channel disposed along the river; aquatic plants disposed in the rainwater channel are effective to purify water flowing within the rainwater channel; and draining vents provided in the rainwater channel that discharge purified water into the river course.

A system for aeration and separation of contaminants from flowing water in a channel, comprising: a wall (1) partially embedded in the channel of flowing water; a mesh (4) placed above the wall (1); a plurality of baffles (3, 5) partially embedded in the channel and placed opposite to each other in such manner so as to the increase the distance travelled by water; plants algae planted around and on the baffles (3, 5); a flooring (6) sloping towards flowing water direction; a sink (2) constructed at a depth lower than the flooring (6); and a water wheel (11) placed in flowing water.

A system for aeration and separation of contaminants from flowing water in a channel, comprising: a wall (1) partially embedded in the channel of flowing water; a mesh (4) placed above the wall (1); a plurality of baffles (3, 5) partially embedded in the channel and placed opposite to each other in such manner so as to the increase the distance travelled by water; plants algae planted around and on the baffles (3, 5); a flooring (6) sloping towards flowing water direction; a sink (2) constructed at a depth lower than the flooring (6); and a water wheel (11) placed in flowing water.

A reservoir dredging assembly includes a dredging tube and at least one dredging device adapted to be installed to at least one secondary reservoir. The at least one dredging device includes a linking tube, an extending tube, a water gate, and a control unit. The linking tube is connected to the dredging tube for water in a primary reservoir, together with sediments deposited therein, to flow through. The extending tube has a top cutlet adapted to be located lower than the maximum water level of the primary reservoir. The water gate is mounted in the linking tube at a position downstream of the extending tube. The control unit is convertible between a first state for closing the water gate and a second state for opening the water gate.

A reservoir dredging assembly includes a dredging tube and at least one dredging device adapted to be installed to at least one secondary reservoir. The at least one dredging device includes a linking tube, an extending tube, a water gate, and a control unit. The linking tube is connected to the dredging tube for water in a primary reservoir, together with sediments deposited therein, to flow through. The extending tube has a top cutlet adapted to be located lower than the maximum water level of the primary reservoir. The water gate is mounted in the linking tube at a position downstream of the extending tube. The control unit is convertible between a first state for closing the water gate and a second state for opening the water gate.

The present invention relates to a method for repairing an intake for a storage dam, which comprises; constructing a cabin for controlling sediment, formed by modular rings that are 12 m in diameter and 3 m high, to allow the demolition of the old intake without draining the area; prefabricating elements for extending the new intake in situ by means of metallic formwork for setting the modular elements which are subsequently steam-cured and transferred to a final location by means of a barge and cranes. The final assembly is carried out using divers and cabin equipment, such as lighting, closed-circuit cameras, monitoring, emergency stairs and an elevator or service elevator, ensuring a reduction in the time and cost of repairing an intake in storage dams.

The present invention relates to a method for repairing an intake for a storage dam, which comprises; constructing a cabin for controlling sediment, formed by modular rings that are 12 m in diameter and 3 m high, to allow the demolition of the old intake without draining the area; prefabricating elements for extending the new intake in situ by means of metallic formwork for setting the modular elements which are subsequently steam-cured and transferred to a final location by means of a barge and cranes. The final assembly is carried out using divers and cabin equipment, such as lighting, closed-circuit cameras, monitoring, emergency stairs and an elevator or service elevator, ensuring a reduction in the time and cost of repairing an intake in storage dams.

A trash rake system with an articulated rake head assembly is provided. The trash rake system includes a main unit, a telescoping boom attached to the main unit, and a rake head assembly attached to an end of the telescoping boom. The rake head assembly includes a base frame, a drive arrangement mounted to the base frame, and a rake head mounted to the drive arrangement. The drive arrangement includes at least one gear arranged to mesh with a rack gear mounted to a rack which is in turn mounted between a fixed member and a movable member of the telescoping boom.