Discharge of nitrogen and phosphorus from urban wastewater treatment plants

Indicator Fact Sheet

Prod-ID: IND-258-en

Also known as: WEU 009

expired

This is an old version, kept for reference only.

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Topics: Water and marine environment ,

This page was archived on 08 May 2015 with reason: No more updates will be done

Assessment made on 01 Oct 2003

Generic metadata

Classification

Topics:

Water and marine environment

DPSIR: Pressure

Identification

Indicator codes

WEU 009

Contents

Policy issue: Are discharges of nutrients and organic matter decreasing?

Figures

Waste water treatment in regions of Europe Only countries with data from all periods included, the number of countries in parentheses

Nutrient discharges and waste water treatment in selected western European countries Data from Denmark, Finland, Netherlands, Norway (no nitrogen), Sweden.

Key assessment

Over the last 20 years, marked changes have occurred in the proportion of the population connected to waste water treatment as well as in the waste water treatment technology involved.

In the northern countries, most of the population are today connected to waste water treatment plants with tertiary treatment, which efficiently removes nutrients and organic matter from the waste water. In the central EEA countries, more than half of the waste water is treated by tertiary treatment, a quarter by only biological treatment which removes most of the organic matter and the ammonia. Southern countries and the accession countries for the moment only have around half of the population connected to waste water treatment plants. Some 30 to 40 % of the population are connected to secondary or tertiary treatment.

The improvement in waste water treatment was due to implementation of the urban waste water treatment directive (see the status of implementation at later indicator) and resulted in marked lower discharge of organic matter and nutrients to water.

In the countries included in Figure 3.17, the percentage of population connected to tertiary treatment increased from 40 to 80 % during the 1990s. Over the same period, the discharge of phosphorus and nitrogen from waste water treatment decreased by 60 and 30 % respectively. This difference reflects that nearly all the tertiary treatment plants have phosphorus removal while only some of the plants, in particular the large plants, have nitrogen removal.

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For references, please go to https://www.eea.europa.eu/data-and-maps/indicators/discharge-of-nitrogen-and-phosphorus or scan the QR code.

PDF generated on 18 Jul 2018, 12:35 AM

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