Lec Waste Water Treatment. nptelhrd. Loading. of Mining Engineering, IIT Kharagpur. For more details. NPTEL provides E-learning through online Web and Video courses various streams. Wastewater treatment is a fairly new practice although drainage systems were built long . Technology Enhanced Learning (NPTEL), ).


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In the section on domestic water treatment wastewater treatment nptel the following are discussed — sources and quality of municipal water supply, water quantity and intake details, unit processes in municipal water treatment, municipal water treatment plant design details, water storage tanks and distribution network and wastewater treatment nptel water supply.

The course modules for this section can be downloaded at the NPTEL website here The section on domestic wastewater collection and treatment deals with municipal wastewater quantity and quality, municipal wastewater collection and treatment philosophy, preliminary and primary wastewater treatment, wastewater treatment nptel wastewater treatment, tertiary and advanced treatment, residuals management, municipal wastewater treatment plant design details, treated effluent disposal, natural methods of wastewater treatment, hygiene and sanitation.

Considerations such as, purification rates, loading rates, investment cost, energy balance, space requirements, operational costs, and specific long term experience with certain wastewaters are all important, but they will be valued differently from industry to industry.

NPTEL :: Civil Engineering - Water and Waste Water Engineering

Various anaerobic reactor types in practice are summarized in Table wastewater treatment nptel Henze and Harremoes, In suspended growth wastewater treatment nptel microbial cultures are freely suspended in the reactors.

Microorganisms are suspended in the wastewater, as a single cell or as their agglomerates. Various reactor types developed on the principles of suspended growth are discussed hereunder.

The anaerobic contact process essentially involves two phases.

A wastewater treatment nptel phase, where the raw waste is intimately mixed with a previously developed and available anaerobic sludge culture in the reactor; and a separation phase, where the active sludge particles are separated from the treated liquor and recycled to the contact unit.

In this process, raw wastewater is mixed with recycled sludge solids and then digested in a digestion chamber.

Wastewater Treatment and Recycling - Course

After digestion, the mixture is separated in a clarifier or vacuum flotation unitand the supernatant is discharged as effluent. Settled sludge is then recycled to seed the incoming waste. Obviously, a waste wastewater treatment nptel process for low-strength wastes is an economical one if large volume of waste can wastewater treatment nptel forced through the system in a relatively short time period.

For this purpose process are required in which the biomass retention time can be controlled independently of the wastewater flow rate. Conventional anaerobic treatment processes of the flow-through type are wastewater treatment nptel inadequate to treat low-strength wastes.


Advances in the understanding of how anaerobic wastewater treatment nptel function, improved understanding of mixing and mass transfer, and anaerobic reactor design, has led to the evolution of a new generation of high-rate anaerobic processes e.

These systems have been schematically presented in Wastewater treatment nptel High biomass concentration is maintained in a reactor with relatively low treatment time.

Among the other improved high rate anaerobic treatment methods, UASB has secured an important place. In the DSFF reactor, the biomass is present as a biofilm attached to the support media.


The other major wastewater treatment nptel between these reactors is the direction of liquid flow through the packing. In the AF, the feed enters at bottom of the reactor.

In the DSFF reactor, influent is applied in downward direction from the top of the rector.

Wastewater Treatment and Recycling

Both reactors can be used to treat either diluted or concentrated soluble wastewaters. Because of the relatively large clearance between the channels in the vertically oriented media used, the DSFF reactor is able to treat wastewater with relatively high suspended solids while the AF cannot.

Because the wastewater treatment nptel are retained on the media and not washed off in the effluent, mean cell wastewater treatment nptel times of the order of days can be obtained. In the AF, most of the biological activity is due to the biomass in suspension entrapped rather than to the attached biofilm.

NPTEL :: Civil Engineering - Wastewater management

wastewater treatment nptel The media with a high capacity to entrap and prevent washout of the biomass from the reactor is wastewater treatment nptel important than the specific surface area surface area to volume ratio of the media. The biofilm thickness of 1 to 3 mm has been observed in fixed-bed reactor.

In the DSFF reactor systems, virtually all of the active biomass is attached to the support media.


Different types of support media such as needle punched polyester NPP and red drain tile clay, PVC or wastewater treatment nptel can be used. For NPP, this attachment is probably associated with its surface roughness.

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