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Types of waste

Organic and inorganic waste

Biological treatment of wastewater

Activated sludge process

Biofiltration method

Biological treatment of wastewater

Operation of a wastewater treatment plant


Removal of inorganic salts from wastewater

Nitrogen cycle in nature

Biological removal of nitrogen and phosphorus compounds

Renewable and non-renewable energy sources


Biogas and biofuels

Comparison of calorific values

Obtaining biogas

The sources of energy

Industrial production of enzymes

Production of enzymes

Application of enzymes

Enzymes in washing powders

The properties of enzymes

Biological washing powders

How do the enzymes in washing powders work?