Environmental

The biomass produced in activated sludge tanks and clarifying tanks is stabilized in the digestion tower and used to produce biogas. A thorough mixing of the sludge increases the gas yield and reduces its retention time in the reactor. In the process, the gas is withdrawn from the upper part of the digestion tower, compressed in the compressor and reintroduced through the nozzles at the bottom.

The pump's operating liquid cools the digester gas by absorbing the heat of compression, thus providing an almost isothermal mode of operation. This has a positive effect on the service life of downstream valves, gas burners and motors, and it reduces maintenance costs.

The cooling function of the operating liquid simultaneously acts as a flame arrester and reduces expenditures for explosion protection. The contaminated raw gas is also cleaned in the water ring as though in a gas scrubber and is partially dried. The gas is thus oxygenated and returned to the wastewater treatment process.

The water's oxygen content can be substantially increased using gas ring blowers or liquid ring pumps, which in turn increases the number of fish that can be kept in a pond twofold or even threefold. In this process air is drawn from the atmosphere and forced through an inlet into the tube aerator. It is then diffused into the water through tiny openings and rises in fine bubbles.

The oxygen in the water causes the fish to grow and multiply more rapidly and significantly increases the yield.

In fish farming pneumatic conveying systems are used to feed the fish. These pellets are susceptible to damage and valuable feed can be lost during pneumatic conveying of feed pellets from the feed barge to the sea cages. Using variable speed drive side channel blowers avoid this complication while at the same time taking up only a quarter of the space needed for other technologies. Minimum maintenance and very low noise and vibration levels are further key features.

Gasoline vapor recovery is the process of capturing gasoline vapors emitted from a vehicle's fuel tank during the refueling process. Vapor recovery prevents the formation of low-level ozone and the release of toxic air contaminants found in gasoline (petrol). A switch detects pressure limitations inside the tanks and turns the compressor on and off.

The vapors are sucked through a scrubber where the liquid trapped is returned to the liquid pipeline system or to the tanks and then, by means of p. d. blowers, recompressed into the evaporator circuit.

Pressurized water and industrial strength vacuum is used to simultaneously excavate and evacuate soil. As hydroexcavation safely breaks up soil, the soil and water slurry are conveyed by vacuum to a debris tank, using vacuum blowers.

The digestion of covered garbage under exclusion of oxygen produces landfill gas. The gas is collected in collection systems, removed from the landfill and compressed by gas compressors or gas blowers. The gas can be used as heating fuel, transformed into electricity or used as liquefied gas.

Soil gas extraction is an approved method for the reclamation of soil polluted with aromatic hydrocarbons and volatile halogenated hydrocarbons. The operating range of the side channel blowers, depending on the amount and distribution of the substances, saturation pressure of the pollutant, air flow through the soil and vacuum applied, amounts to 10 - 80 m.

Disposal of the extracted air must be carried out in compliance with the Technical Instructions on Air Quality.

Laminating is a cyclic process. The different layers are taken into the laminator's chamber where the air is evacuated using vacuum. In a second step, still under vacuum, the polymer films are baked using heat.