Within the business unit PUMPS the business field Environments is,throughout the world,specialized in
sewage treatment and digester gas technology.We offer various pumping systems for all process stage,
i.e.the ideal solution.   

·Range of our products at a waste water treatment plant

·Range of our products at a multi-stage industrial bio-gas plant

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	Thickened sludge By static or mechanical thickening methods a first reduction in the volume of the sludge is achieved.The objective is to reach a dry solids content of 6% to 11% in the pump fluid. Depending on the consistency,the fluids have low to high viscosity and may be pumped over long distances. Multistage NEMO® progressing cavity pumps are capable of pumping against high pressures.Even fluctuating process conditions are handled without problems.
	Dewatered sludge Dewatering of the sludge with the addition of conditioning additives into contrifuges,decanters or filter presses generates a further reduction of volume between 65% and 80%.The results is a crumbly,compacted,non-flowing product. Due to these features force feeding of the fluid within the pump is required. Furthermore,bridge-building has to be avoided. In general,NEMO® progressing cavity pumps with rectangular hoppers and feeding screws are used for this application.The special features of these pumps are the positioned,patented feeding screws for optimal transfer into the conveying chambers.For sludges with a tendency to bridge-building the NEMO® progressing cavity pumps is equipped with an integrated bridge breaker.
	Flotation sludge Flotation sludge and sludge foam are floating sludge fractions building up on the surface of the secondary sedimentation tank. This undesirable effect will necessitate the pumping away of the flotation sludge in the form of an air-fluid mixture. The ideal device for this application is the NEMO® progressing cavity pumps which can reliably and continuously convey fluids containing a high degree of gas.
	Bio-mass Bio-mass is a renewable raw material representing a source for the future.The inhomogeneous,organic substance occurs in anything between liquid and solid form.With the help of micro organisms gaseous methane and carbon dioxide are reclaimed. Depending on the process,the bio-mass has to be continuously agitated in the reactor.In this case you need pump systems capable of coping with flow rates and large particle sizes within the dry solids content. Both NEMO® progressing cavity pumps and NETZSCH TORNADO® rotary lobe pumps are used for this application.However,due to the completely free passage of particle sizes up to 70mm NETZSCH TORNADO® rotary lobe pumps are usually preferred.Another advantage of this pump is its compact, space-saving design.
	Thin sludge Thin sludge is the most common sludge in a waste-water treatment plant.The dry solids content is approx.1% to 4%.According to the stage of the process the sludge contains varying quantities of organic and inorganic solids. Depending on the process,pumps with long serviceable lives are required which provide high flow rates at low pressures. Both NEMO® progressing cavity pumps and NETZSCH TORNADO® rotary lobe pumps are eminently suitable.The NEMO® progressing cavity pump stands out above all for its high performance based on L or P geometries.Another advantage is a long service life due to an extended seal line and a reduced sliding velocity of the rotor.
	Lime milk By lime milk we understand an inorganic suspension consisting of lime hydrate and water.Alternatively,lime milk can be produced by slaking unhydrated lime with water.Lime milk is used as a conditioning substance for dewatering sludges. Geometry and structure of the calcium hydroxide (lime) is dependent on its origin and the method of processing.The medium is very abrasive. For long serviceable life,NEMO® progressing cavity pumps are made from high quality rotor/stator material.Most suitable is the wear-free NEMO CERATEC® ceramic rotor in connection with an extremely wear resistant polyurethane stator.
	Auxiliary Flocculents Flocculents are added to the sludge before dewatering.They stimulate the formation of big flocs of suspended solids contained in the sludge,thus, contributing to improved dewatering results. In genaral,flocculents are dosed as polymeric solutions or dispersions. Theri viscosity-together with the necessity for exact dosing-asks for pumps with certain capabilities,capabilities which NEMO® progressing cavity pumps provide.