SPX Cooling Technologies MXF 7400 manual Relative Energy Consumption, History, Advantages, Future

Influent &

Intermediate

Pumping

Secondary Treatment

Sludge Treatment

Building

Heating

& Cooling

Relative Energy Consumption

1 2 3 4 5 6 7 8

10ft. Total Head

30ft. Total Head

100ft. Total Head

Preliminary Treatment

Primary Treatment

Trickling Filter

Activated Sludge

Extended Aeration

Incineration

Aerobic Digestion

Thicken & Anaerobic Digestion

Drying Beds

Haul to Landfill

Aerated Ponds

Chlorination

Northern U.S.

Southern U.S.

Source: Water and Sewage Works 3-1

Fixed Film Process

History

For over 100 years the fixed film reactor (trickling filter) has been used in wastewater treatment to reduce the biochemical oxygen demand (BOD) and for nitrification. As the wastewater passes down through the trickling filter, microorganisms on the surface of the media convert the dissolved organic wastes and ammonia nitrogen into stable by-products

-carbon dioxide, nitrates, nitrites and biosolids which are removed by clarification.

Advantages

The advantage of the trickling filter process over other methods of treating wastewater include:

1.Lower energy consumption (Fig. 3-1)

2.More resistant to hydraulic and organic shock loads

3.Simple operational procedures

4.Fewer personnel required to operate

5.Reduces sludge bulking problems

Future

With the advent of the highly efficient modular 60° cross flow media (MARPAK MXF Series), the trickling filter is a viable alternative for complete secondary treatment (Figs. 8-1 and 8-2) and nitrification (Fig. 9-1) of municipal wastewater. As energy and labor costs continue to increase, the trickling filter process will become even more cost effective in wastewater treatment.