What is the main purpose of this code?

To guide engineers in selecting the most suitable sewage treatment process based on site-specific conditions, influent/effluent characteristics, and economic factors (Clause 1).

What are the primary factors for selecting a treatment process?

Influent sewage characteristics, effluent quality requirements, environmental impact, land availability, energy requirements, and capital/O&M costs (Clause 6).

Does this code recommend a single best treatment method?

No, it describes multiple conventional processes (like Activated Sludge, Trickling Filters, Oxidation Ponds) and provides a framework for choosing the most appropriate one for a given situation (Annex A).

Which process is suitable if land availability is a major constraint?

Processes with a smaller footprint like the Activated Sludge Process (ASP) are generally preferred over land-intensive options like Oxidation Ponds (Clause 6.2.2).

IS 13628

: 1993

Sewage treatment plants - Guidelines for selection of process

CurrentFrequently UsedGuidelinesBIMEnvironmental Engineering · Environmental and Sanitation

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This standard provides comprehensive guidelines for selecting an appropriate process for sewage treatment plants. It outlines key factors like influent characteristics, desired effluent quality, land availability, and cost-effectiveness, while describing various common treatment systems to aid decision-making for engineers.

Offers guidelines for selecting appropriate sewage treatment processes based on various factors like influent characteristics, effluent quality requirements, and cost.

Quick Reference Values

Effluent BOD for discharge to inland surface water< 30 mg/l

Effluent TSS for discharge to inland surface water< 100 mg/l

Typical land requirement for Activated Sludge Process (ASP)0.4 - 0.6 ha/MLD

Typical land requirement for Oxidation Ponds3 - 5 ha/MLD

BOD removal efficiency of Activated Sludge Process85-95%

BOD removal efficiency of Oxidation Ditch90-98%

Typical hydraulic retention time (HRT) for ASP6-8 hours

Practical Notes

While the code provides a good framework, always consider newer technologies not covered in this 1993 edition, such as MBR (Membrane Bioreactor) and SBR (Sequencing Batch Reactor).

The final selection should be based on a life-cycle cost analysis (LCCA), including capital, operational, and maintenance costs, not just initial investment.

Always check the latest and most stringent requirements from the Central Pollution Control Board (CPCB) and the respective State Pollution Control Board (SPCB) as they supersede the general standards mentioned.