Metering pumps in sewage plants

In order to keep the coordinated microbiological processes of sewage plants in balance additives have to be applied when necessary. 

Solutions

LEWA supplies sturdy metering pumps that can easily be implemented in metering systems, either in new ones in the planning phase or as replacement for older pumps in existing systems. LEWA pumps are provided in a modular design that grants a high flexibility.

A wide range of material choices assures highest chemical resistance and a long lifetime of the wetted parts in every situation. The pumps are designed for long-term use and high availability, amongst others due to sandwich diaphragms which provide emergency running properties in case one of the diaphragm layers is worn. Additionally, the most important spare parts are always in stock.

Rake and grit trap
Mechanical pre-cleaning 
LEWA offers solutions for: 

  • Suction of the settled sand(sand-water mixture) with specially coated centrifugal pumps and air-operated diaphragm pumps

Primary clarifier diaphragm pumps
Further reduction of the flow velocity,
approx. 1.5 h retention time
LEWA offers solutions for:

  • Targeted addition of C-sources (e.g. isopropanol, glycerol) for phosphorus degradation with diaphragm metering pumps
    LEWA ecosmart or LEWA ecodos
  • Tank truck unloading of C- sources with lined centrifugal pumps

Aeration tank
Nitrogen degradation
LEWA offers solutions for:

  • Chemical precipitation with iron(III) chloride, metering of flocculation aids with diaphragm metering pumps LEWA ecosmart or LEWA ecodos

Fourth clarifier
For trace substances (e.g. drug residues) sand filter systems with activated carbon filter
LEWA offers solutions for:

  • Backwashing of the filters with water, reuse of the filter sand with centrifugal pumps and compressed air diaphragm pumps

LEWA metering pumps convey additives in sewage plants:

For example: C-sources like isopropanol and glycerin or ferric chloride and other flocculants

Background

Sewage treatment plants are necessary to turn wastewater from households or municipalities into clean water that can be returned to the water cycle.

In such plants, there are several process steps for removing unwanted contaminants – physically, microbiologically and chemically. Depending on the composition of the various wastewater types that enter the plant, auxiliary fluids like isopropanol have to be added to keep the conditions for microbiological stability within certain limits. E.g., when the level of C-sources is too low.

Flocculants help to coagulate ingredients that microbes cannot neutralize. Those molecules may then be removed mechanically.

Industries

Pumps and Metering Systems for Other Industries

LEWA offers customized solutions and references for almost all industries in which processes require exact metering or the reliable conveyance of fluids. As specialists in fluid handling, we of course also have experience in areas outside of our key markets.

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Products

LEWA ecosmart® diaphragm metering pump

LEWA ecosmart is an innovative, compact and multiplexing diaphragm metering pump at a smart price. With it, we of course guarantee our renowned LEWA quality and offer you our expertise derived from 70 years in the market.

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LEWA ecodos® mechanical diaphragm metering pump

LEWA ecodos is an absolutely reliable, economical and highly adaptable metering pump, especially where diaphragm actuation is not wanted. Here, we also rely on our tried-and-tested modular system in designing the perfect pump for you.

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