Products that monitor, analyze, store and recover materials that are harmful to our environment are becoming more sophisticated everyday. In addition, manufacturers worldwide are increasingly challenged with producing products in an environmentally sound environment. Gardner Denver can provide solutions for any challenge requiring pressure, vacuum or flow within the environmental arena.

Air Sampling

Air and dust sampling determines the level and types of viable fungal propagules within building trouble spots, and suggests the presence of significant indoor mold growth sites ("amplifiers").

Biogas Production

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 In the process, the gas is withdrawn from the upper part of the digestion tower, compressed in the compressor and reintroduced through the nozzles at the bottom.

Compressed Air Applications

As the cleanest form of energy around it makes sense that compressed air is a major consideration in environmental products and projects. Oil free and oil lubricated compressors are used in a variety of applications from air conditioning systems, to the development of re-usable energy forms and power generation plants. Compressed air is versatile reliable and safe, it can be used directly in the process such as sewage treatment plants or air separation, or it can be used as a motive force in an environmentally friendly process.

  • Air conditioning – Compressed air is used for control systems to operate the opening and closing of control valves
  • Wind generation – Compressed air is used in the manufacturing process of wind generators. It is also used as a source of energy that can be generated by wind farms.
  • Sewage plant – Compressed air is used to control sewage flow, and air oxidation of sewage tanks
  • Water purification and oxidization – Compressed air is released into water to stop stagnation
  • Landfill sites – Compressed air is released into the ground to push out toxic gases
  • Air separation – Compressed air is filtered via a membrane to generate clean gases
  • Artificial snow making – Compressed air is used to atomize water through a series of orifices and projected into the air by a powerful fan. The atomized water falls as snow.

Digester Gas Compression

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 filtering process is accelerated by applying vacuum to a container which then pulls the liquid through a filter. The vacuum thus “helps“ gravity do its job.

Fish Pond Aeration

Water's oxygen content can be substantially increased using side channel blowers, compressors or liquid ring pumps. This increases the number of fish that can be kept in a pond twofold or even threefold. 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. Aeration is used also to provide suitable living conditions for fish and other aquatic species in places otherwise lacking in sufficient oxygen.

Gas Analyzers

This type of instrumentation is required to check hydrocarbons that are present in emissions that escape into the atmosphere through industrial smokestacks. The EPA regulates how much of certain chemicals, such as CO2, CO, SOX, NOX etc., can be present in the gases that are emitted to the atmosphere.

Gas Detectors

A portable flame ionisation detector is used to measure concentrations of hydrocarbons within a sampled gas. The presence of hydrocarbons is detectable by burning the sampled gas in an air-hydrogen flame. The presence of hydrocarbons in the sampled gas, when burnt with an air-hydrocarbon mix, causes high level of ionisation. The level of ionisation is proportional to the number of carbon atoms within the sample which is taken by the Thomas diaphragm pump.

Laminating Solar Modules

Laminating is a cyclic process. A sandwich is typically made of the various layers which are 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.

Landfill Site

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.

Leak Detection

In many countries, safety devices are required for the monitoring and protection of fuel oil in buried tanks. To prevent the leakage of fuel, double-walled tanks or plastic covers (for older, single-walled tanks) are used. In between the double-wall a vacuum is built up and monitored by a pressure detector. Pressure variations and very small leakage on tube fittings and threaded joints are constantly leveled by the pump integrated in the monitoring device. The pressure detector switches on the pump when a minimum pressure is reached and switches it off when a maximum pressure is reached.

Particle Counters

For manufacturers of semiconductors, pharmaceuticals and biotechnology products, indoor air quality is critical. In these environments, "cleanrooms" monitor the air for particle and dust contamination. Unlike gas analysis, a particle counter measures the size and quantity of the contamination - it makes no identification. Measurement is made through observing the scattering of a laser beam as the sample passes through it. Essential for this application is a constant and pulsation free flow, in addition to the ability to control the flow easily.

Portable Compressors

The use of portable compressors in the environmental industry is mainly concentrated with the construction of renewable energy plants in remote locations. It is also used for environmental exploration studies such as drilling ice in the polar regions to study the effects of global warming.

Refrigerant Recovery

Refrigerant is used today in all air conditioning systems for motorised vehicles along with residential and commercial buildings, and requires periodic servicing. The Freon used in these systems can no longer be purged to the atmosphere and must be recovered in federally approved containers.

Sewage Aeration

These types of systems are used today to control wastewater in residential homes. Wastewater from the household enters a compartment where air is introduced to begin the growth of aerobic organisms. The organisms convert the waste organic materials into gases and additional microbial cell material. In addition to supplying oxygen, the aeration system keeps the contents of the aeration zone well mixed to provide optimum exposure of the microorganisms to the waste materials. Effluent may be discharged to a ditch or to a new or existing drain field, whichever is mandated by local health restrictions.

Soil Gas Extraction

Soil gas extraction is an approved method for the reclamation of soil polluted with aromatic hydrocarbons and volatile halogenated hydrocarbons. The operating range of 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.

Suction Vehicles for Wastewater Cleaning

The suction pressure necessary for removing wastewater and cleaning sewer networks is provided by vacuum pumps. The contaminants in the wastewater are sucked in and can be flushed out periodically by means of pumps.

Vacuum Priming

The extracted air may contain contaminating gases, vapours and particulates. We offer technical solutions that protect from these harmful inclusions and offer reliable continuous operation.

Vapor Recovery

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 the vapor recovered is pumped into holding tanks.

Wastewater Disposal

With the use of central vacuum systems the disposal of wastewater can be effected at the same place. The wastewater can be collected, drained and disposed of in complete housing areas at the same time. With the use of vacuum up to 97% of the wastewater can be transported uphill.

Wastewater Purification/Oxygenation of Activated Sludge Tanks

To reduce the space requirements and costs of wastewater treatment plants, a growing number of activated sludge tanks are being set up. The introduction of oxygen is extremely important for purifying wastewater. Compressors supply the compression pressure required for maximum oxygen yield.

Water Sampling

Water is a critical component in all residential and industrial settings. It needs to be constantly analysed to assure it is safe to drink and free from harmful chemicals when emitted into rivers and lakes. This instrumentation will analyse such items as dissolved oxygen, fecal coliform, pH, temperature, phosphates, nitrates, turbidity and heavy metals.