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Packaged wastewater treatment plant Packaged domestic wastewater treatment (WWT) plant is pre-manufactured treatment plant used to treat wastewater in small communities or single dwellings. The sequencing batch reactor (a modification of activated sludge process) can consistently perform nitrification, denitrification and phosphorous removal Packaged wastewater treatment plant

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Packaged wastewater treatment plant

Packaged domestic wastewater treatment (WWT) plant is pre-manufactured treatment plant used to treat wastewater in small communities or single dwellings.

Main characteristics

Packaged domestic WWT plant usually provides primary, secondary and tertiary stages of WWT and can be used as the only WWT system for a household. The variety of packaged WWT plants are available in market. Part of them provide only primary and secondary treatment stages, or even only secondary WWT stages.

Basic principles of operation
Very different technological processes are used for secondary treatment. The most common of them is activated sludge process with its modifications (extended aeration, sequencing batch reactors and oxidation ditches, contact stabilization plants) and additional physical/chemical processes. It explains the large number of packaged domestic WWT plants available on the market for small domestic WWT solutions.

Example of packaged domestic wastewater treatment plant.

ADVANTAGES	DISADVANTAGES
High efficiency of removal for organic matter, suspended solids and total nitrogen.	Operation is power supply dependent.
Systems are easy to install, as they are shipped in one or two pieces.	Sludge must be disposed frequently
Most of systems (except oxidation ditches) are odour free.	Not all modifications of activated sludge process achieve denitrification or phosphorus removal without additional unit processes.
WWT systems require less space than constructed wetland or soil filter.
Plants are easy to operate, as many are manned for a maximum of two or three hours per day.
The sequencing batch reactor (a modification of activated sludge process) can consistently perform nitrification, denitrification and phosphorous removal.

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Packaged wastewater treatment plant

Main characteristics Packaged domestic WWT plant usually provides primary, secondary and tertiary stages of WWT and can be used as the only WWT system for a household The variety of packaged WWT plants are available in market Packaged domestic wastewater treatment (WWT) plant is pre-manufactured treatment plant used to treat wastewater in small communities or single dwellings.