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Updated by seclib on Nov 03, 2020
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Separating mixtures

8 Methods of sewage treatment

Every community should have a way of disposing of sewage so that people, animals and flies cannot touch it. This is called a sewage system.

There are different types of sewage systems which can be described as on-site systems and sewage or effluent systems.

An on-site system is one which treats the sewage in a septic tank so that most of the sewage becomes effluent and is disposed of in an area close to the house or buildings. An example of an on-site disposal system consists of a septic tank and leach drains.

A sewage or wastewater system disposes of the effluent from a community at a central place usually called a sewage lagoon or effluent pond. The sewage can be treated:

How Are Oil Spills Cleaned?

There are four basic ways to clean or contain an oil spill, and workers determine the most appropriate method depending on the location of the spill, potential hazards, weather conditions, waves and currents.

Water purification information including filtration.

Refining of Petroleum

is a complex mixture of organic liquids called crude oil and natural gas,
which occurs naturally in the ground and was formed millions of years
ago. Crude oil varies from oilfield to oilfield in colour and composition,
from a pale yellow low viscosity liquid to heavy black 'treacle' consistencies.

Information about Melbourne water supply, water quality, catchment areas and treatment plants & processes.

Methods for separating mixtures

Most mixtures can be separated, and the kind of separation method depends on the kind of mixture it is. Here are some common separation methods


Study how mixtures can be separated using filtration, evaporation, distillation and chromatography with BBC Bitesize KS3 Science.