The invention in one form is directed to an airlift pump that is optimized to transfer large volumes of water using very low pumping head. Specifically, the airlift pump is comprised of a pump inlet and outlet which are both located below pond's surface. The pumping force driving the water flow is supplied by the weight of the volume of water displaced by pressurized air into a vertical pipe, and this energy is dissipated by the friction of the rising bubbles pipe entrance head, plus the frictional effects of the inner pipe wall and the energy contained in the water's exit velocity.

An apparatus for oxygenating water includes a discharge chamber with a fluid inlet and a fluid outlet, an electronic unit coupled to the discharge chamber, and a power source configured to power the electronic unit. The electronic unit is configured to interact with water disposed within the discharge chamber. The electronic unit is configured to apply a sequence of increasing pulses to the water to produce oxygenated water.

An apparatus for oxygenating water includes a discharge chamber with a fluid inlet and a fluid outlet, an electronic unit coupled to the discharge chamber, and a power source configured to power the electronic unit. The electronic unit is configured to interact with water disposed within the discharge chamber. The electronic unit is configured to apply a sequence of increasing pulses to the water to produce oxygenated water.

An apparatus for aerating bodies of water, comprising a floating platform (19), a motor (15) supported by the floating platform (19), a transmission (16) which is coupled to the motor (15) and whose output shaft is in the form of a hollow shaft (17), a fan for supplying air through an air supply line (18) connected thereto, wherein the air supply line (18) is connected to one end (E1) of the hollow shaft (17), a hollow stirring shaft (1) coupled to the other end (E2) of the hollow shaft (17), an stirrer (K) affixed to the free end of the approximately vertical stirring shaft (1), wherein the stirrer (K) is designated as a hollow body and has a central opening (3) through which air supplied by the stirring shaft (1) can pass, and a multiplicity of air outlet openings (14).

An apparatus for aerating bodies of water, comprising a floating platform (19), a motor (15) supported by the floating platform (19), a transmission (16) which is coupled to the motor (15) and whose output shaft is in the form of a hollow shaft (17), a fan for supplying air through an air supply line (18) connected thereto, wherein the air supply line (18) is connected to one end (E1) of the hollow shaft (17), a hollow stirring shaft (1) coupled to the other end (E2) of the hollow shaft (17), an stirrer (K) affixed to the free end of the approximately vertical stirring shaft (1), wherein the stirrer (K) is designated as a hollow body and has a central opening (3) through which air supplied by the stirring shaft (1) can pass, and a multiplicity of air outlet openings (14).

The application relates to a method for remediation and/or restoration of an anoxic body of water (10), wherein a calcium nitrate solution (3) is added to the anoxic body of water (10), and wherein the method comprises the steps of mixing water having a percent of oxygen saturation of between 50% and 150% with the calcium nitrate solution (3), resulting in a mixture, and pumping the mixture into the anoxic body of water (10), wherein the final concentration of nitrate-N in the remedied and/or restored anoxic body of water (10) is between 1 and 20 mg/l. The application furthermore relates to a system (1) for remediation and/or restoration of an anoxic body of water (10), wherein the system (1) is provided with means to add a calcium nitrate solution (3) to the anoxic body of water (10), wherein the means to add the calcium nitrate solution (3) to the anoxic body of water (10) consists of a mixing device (2) arranged to mix the calcium nitrate solution (3) with water having a percent of oxygen saturation of between 50% and 150%, resulting in a mixture, and wherein the system (1) comprises first pumping means (5) for pumping the mixture into the anoxic body of water (10).

The application relates to a method for remediation and/or restoration of an anoxic body of water (10), wherein a calcium nitrate solution (3) is added to the anoxic body of water (10), and wherein the method comprises the steps of mixing water having a percent of oxygen saturation of between 50% and 150% with the calcium nitrate solution (3), resulting in a mixture, and pumping the mixture into the anoxic body of water (10), wherein the final concentration of nitrate-N in the remedied and/or restored anoxic body of water (10) is between 1 and 20 mg/l. The application furthermore relates to a system (1) for remediation and/or restoration of an anoxic body of water (10), wherein the system (1) is provided with means to add a calcium nitrate solution (3) to the anoxic body of water (10), wherein the means to add the calcium nitrate solution (3) to the anoxic body of water (10) consists of a mixing device (2) arranged to mix the calcium nitrate solution (3) with water having a percent of oxygen saturation of between 50% and 150%, resulting in a mixture, and wherein the system (1) comprises first pumping means (5) for pumping the mixture into the anoxic body of water (10).

An automatic draining device for condensed water or leaking water in an aeration pipeline comprises a water tank, a draining and exhausting stand pipe and a float bowl valve. According to the automatic draining device, the condensed water or the leaking water is sprayed out through pressurized air; under the condition that the condensed water or the leaking water in the aeration pipeline is basically drained, the outlet is basically closed, only allowing little gas to flow out; and meanwhile, when water is accumulated in the pipeline, the water outlet can be automatically opened widely to drain the accumulated water rapidly.

An automatic draining device for condensed water or leaking water in an aeration pipeline comprises a water tank, a draining and exhausting stand pipe and a float bowl valve. According to the automatic draining device, the condensed water or the leaking water is sprayed out through pressurized air; under the condition that the condensed water or the leaking water in the aeration pipeline is basically drained, the outlet is basically closed, only allowing little gas to flow out; and meanwhile, when water is accumulated in the pipeline, the water outlet can be automatically opened widely to drain the accumulated water rapidly.

An automatic draining device for condensed water or leaking water in an aeration pipeline comprises a water tank, a draining and exhausting stand pipe and a float bowl valve. According to the automatic draining device, the condensed water or the leaking water is sprayed out through pressurized air; under the condition that the condensed water or the leaking water in the aeration pipeline is basically drained, the outlet is basically closed, only allowing little gas to flow out; and meanwhile, when water is accumulated in the pipeline, the water outlet can be automatically opened widely to drain the accumulated water rapidly.