Device for improving water quality

A device for improving water quality, said device comprising:

• an inlet for inflow of liquid into the device;
• a hydraulic circuit for receiving liquid from the inlet, the hydraulic circuit comprising at least a first tank and a second tank, wherein the first tank is upstream of the second tank, and wherein the first tank is nested within the second tank, and wherein an inner wall of the first tank is defined by the second tank, and wherein a base of the second tank is spaced above a base of the first tank;
• an outlet at a downstream end of the hydraulic circuit for discharge of liquid from the device;
• one or more contaminant separation elements in the hydraulic circuit for separation of contaminants from liquid passing therethrough using at least one of:
• gravitational separation;
• sized-based filtration;
• chemical separation;
• magnetic separation;
• electrolytic separation;
• and adsorption or attraction-based separation,
• the first tank being a settlement tank for gravitational settlement of contaminants from the liquid;
• a vortex facilitating formation for generation of a vortex in the first tank;
• one or more hydrocarbon traps, the one or more hydrocarbon traps comprising a first hydrocarbon trap located upstream of the second tank, the first hydrocarbon trap being formed by positioning an upstream end of a fluid flow passageway extending between the first and second tanks below an invert level of the outlet;
• a first filter and a second filter, the first filter being a relatively coarse filter and the second filter being a relatively fine filter, wherein the first filter is located upstream of the second filter, wherein the first filter is located upstream of a downstream end of the fluid flow passageway and wherein the second filter is located in the second tank;
• a conduit extending into the first tank, the conduit having a first open end adjacent the top of the first tank and a second open end in fluid flow communication with a lower portion of the first tank, the conduit passing through the second tank and defining an inner wall of the second tank;
• and
• a relief port in an upper portion of the conduit for fluid flow communication between the conduit and an upper portion of the second tank located between the second filter and the outlet to allow liquid to flow from the first tank up through the conduit and into the second tank via the relief port, bypassing the second filter, in the event of a blockage in the device.