A pivotal rigid vortex shield configured for use in combination with a propeller-type aerator has a vortex shield, and a rigid support affixing the vortex shield to a support system. The support has a horizontal support bar with at least two cross arches, first and second vertical pivot and locking members, and a top arch affixed between. A pintle couples the support to vortex shield, and defines a pivotal axis about which the vortex shield is configured to rotate. A locking member may be at least one quick release pin that in an operational configuration simultaneously passes through at least a portion of at least one of the vertical pivot and locking members and at least a portion of the vortex shield support to prevent rotation of the vortex shield about the pintle. In a service configuration the pin is removed to permit the vortex shield to rotate.

A wastewater treatment system includes an aeration tank under a plurality of trickling filters to receive wastewater from the trickling filters. A plurality of bacteria culture modules are received in each trickling filters. A plurality of blower devices and air pipes are provided to generate ventilation to cool the wastewater flowing out of the bacteria culture modules. Each of the bacteria culture modules has a cage in which a plurality of culture woods are vertically received. Therefore, a temperature of the wastewater is reduced to form an environment which is good to the bacteria.

A wastewater treatment system includes an aeration tank under a plurality of trickling filters to receive wastewater from the trickling filters. A plurality of bacteria culture modules are received in each trickling filters. A plurality of blower devices and air pipes are provided to generate ventilation to cool the wastewater flowing out of the bacteria culture modules. Each of the bacteria culture modules has a cage in which a plurality of culture woods are vertically received. Therefore, a temperature of the wastewater is reduced to form an environment which is good to the bacteria.

A safety access system for use on floats, typically in the field of water and wastewater treatment, the system including rotatable and removable handrails and sockets attached to the float to receive the handrails.

A safety access system for use on floats, typically in the field of water and wastewater treatment, the system including rotatable and removable handrails and sockets attached to the float to receive the handrails.

A safety access system for use on floats, typically in the field of water and wastewater treatment, the system including rotatable and removable handrails and sockets attached to the float to receive the handrails.

A safety access system for use on floats, typically in the field of water and wastewater treatment, the system including rotatable and removable handrails and sockets attached to the float to receive the handrails.

A safety access system for use on floats, typically in the field of water and wastewater treatment, the system including rotatable and removable handrails and sockets attached to the float to receive the handrails.

A safety access system for use on floats, typically in the field of water and wastewater treatment, the system including rotatable and removable handrails and sockets attached to the float to receive the handrails.

Embodiments described methods, systems and apparatuses to utilize a plurality of membrane cartridges and a housing frame comprising a lightweight corrosion resistant material (e.g., non-corrosive metals, non-corrosive composites such as PVC, HDPE and FRP). The anti-corrosive properties of said frame allow of it to be re-used (e.g., with replaced MBR filters). Said MBR frame may be used in a single function or multi-function wastewater treatment container. Said container may also include a corrosion resistant liner coupled to interior portions of each of the base and side walls of the basin, an inlet to receive wastewater treatment influent into the basin, and an outlet to output wastewater treatment process material from the basin.