The Lemna Corporation

The Lemma Corporation

Viet H Ngo

Warren D Poole

Sean J Hancock

Timothy T France

Gary L D'Heilly

A hybrid system and related process for the removal of biological nutrients from wastewater. The system provides an activated sludge system, including both a single-sludge reactor and clarification unit, flowably connected with a final aquaculture pond for final polishing of BOD from the clarified mixed liquor supernatant.

Hybrid biological nutrient removal system

A floating aquatic plant water treatment system (31) utilizes a serpentine channel (36) defined by dividing walls (34). Floating plants (72) are distributed across the water surface by a floating grid structure (32). The grid structure (32) is preassembled into Z-fold bundles (88) which are towed onto the water and unfolded. The treatment system uses sprayers (62) to control growth conditions. Porous baffles (46) are placed along portions of the channel (36) to provide intimate contact with a larger portion of the water while allowing free flow.

Floating aquatic plant treatment system

Floating aquatic plant treatment system with porous system

Floating aquatic plant water treatment system with sprayer system

A sewage treatment pond has an inlet for introduction of sewage into the pond and an outlet for removal of sewage from the pond. A first baffle extends from the surface of the pond to the bottom of the pond and between the inlet and the outlet. The first baffle has an opening located a first distance from the surface of the pond so that sewage can pass through the opening. A second baffle is located between the inlet and the outlet. The second baffle extends from the surface of the pond to the bottom of the pond. The second baffle has an opening located a second distance from the surface of the pond.

Baffle system for anaerobic sewage treatment pond

Floating aquatic plant water treatment system

Growing community of inventors

Minneapolis, MN, United States of America

Viet H Ngo