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Secondary Treatment Of Sewage: Ammonification, Biological Characteristics

   Posted On :  10.07.2016 01:32 am

The quality of effluent provided by secondary treatment may not be always sufficient to meet discharge requirements. i.e.

Secondary Treatment Of Sewage: Ammonification, Biological Characteristics

 

INTRODUCTION

 

The quality of effluent provided by secondary treatment may not be always sufficient to meet discharge requirements. i.e.

 

When large quantities are discharged into small streams

 

Delicate  ecosystems  are  encountered

 

Further treatment may be required to remove nutrients (N, P), suspended solids, dissolved inorganic salts and refractory organics

 

 

1 Nutrient Removal

 

a. Nitrogen Removal

 

-Nitrification-denitrification

 

-Air Stripping

 

b. Phosphorus Removal

 

The quality of effluent provided by secondary treatment may not be always sufficient to meet discharge requirements. i.e.

 

When large quantities are discharged into small streams

 

Delicate ecosystems are encountered

 

Further treatment may be required to remove nutrients (N, P), suspended solids, dissolved inorganic salts and refractory organics

 

Nitrogen Removal using Nitrification-Denitrification

 

 

Ammonification

 

Nitrogen compounds results in wastewater from biological decomposition of proteins and from urea discharged in body waste.

 

This nitrogen is bound in complex organic molecules and is called Organic Nitrogen.

 

While traveling through sewer pipes, the majority of organic-nitrogen is converted to ammonia through the process of hydrolysis.

 

Biological Characteristics

Microorganisms may be classified according to nutrient requirements

All organisms require:

 

          An  Energy–for(1) maintenancesourceand (2) biosynthesis

A  Carbon–forgrowthSourceofmicrobes

 

Heterotrophic these are microorganisms that uses organic compounds as BOTH a carbon source and as an energy source.

 

These organisms are mostly employed in WWT

Chem-Autotrophs these are organisms that uses inorganic compounds as BOTH an energy source and a carbon source.

 

 

Tags : Civil - Environmental Engineering - Sewage Treatment
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