Case Study

Pirana STP Performance Enhancement

Advancing effluent quality with nanobubble technology

Summary

Pirana Sewage Treatment Plant (STP), one of the largest in Gujarat, faced persistent issues in achieving desirable effluent quality despite mechanical aeration. The presence of high BOD and COD levels, foul odor, microbial contamination, and inefficient sludge handling led to environmental and operational challenges. Avior Life Sciences initiated a nanobubble technology pilot to demonstrate its capacity to significantly improve water quality. The results validated nanobubble intervention as a transformative solution for STP performance enhancement and energy efficiency.

Location

Pirana STP (180 MLD), Ahmedabad, Gujarat

Client

Ahmedabad Municipal Corporation (AMC)

Technology Provider

Avior Life Sciences
Pvt. Ltd.

Start Date

3rd December
2024

End Date

5th December
2024

Problem

Common STP challenges faced at Pirana included:

→ High COD (145.88 mg/L) and BOD (72 mg/L) levels in treated water.
→ Low dissolved oxygen in treatment tanks.
→ Persistent odor affecting nearby areas.
→ Over-reliance on chemical disinfection.
→ E. coli >1600 MPN/100ml and Total Coliform present.
→ Energy-intensive aeration processes with limited efficiency.
→ Excessive sludge accumulation and poor dewatering.

ChatGPT Image Oct 16, 2025 at 08_57_41 PM (1)

Result

Avior has conducted this trial in Pirana STP Ahmedabad where a sample size of 100 Liters of Raw Sewage water was removed for treatment with Avior’s Oxygen Nanobubbles and Ozone Nanobubble. Each Batch run lasted for 60 Minutes. Results of which are mentioned hereinbelow.
Parameter Units RawSewage Water Oxygen nanobubbles Ozone nanobubbles
Ph
Ph Unit
7.27
7.46
7.47
Total Suspended Solids
Mg/I
270
51
65
Odour
Sensory
Odour
Odour
Odour
COD
Mg/I
145.88
20.84
112.54
BOD 3 day @ 27”C
Mg/I
72
8
54.81
Total Dissolved Solids
Mg/I
837
739
806
Dissolved Oxygen
Mg/I
6.4
6.2
6.85
Turbidity
NTU
61
29.1
32
E Coli
mpn/100mI
>1600
1450
< 2
Total Coliform
cfu/ml
Present
Present
Absent

Quality Parameters

Odor Elimination : Achieved within hours of operation.
Pathogen Removal : E. coli reduced from >1600 to
<2 MPN/100ml using ozone.
Energy Efficiency : Achieved enhanced oxygenation at
<2 kW power.
Sludge Management : Reduced solids and improved
water clarity.
Scalable : Ready for integration into main STP line.

→ Odor Elimination: Achieved within hours of operation.
→ Pathogen Removal: E. coli reduced from >1600 to
<2 MPN/100ml using ozone.
→ Energy Efficiency: Achieved enhanced oxygenation at
<2 kW power.
→ Sludge Management: Reduced solids and improved water clarity.
→ Scalable: Ready for integration into main STP line.

Recommendations

Based on the success of the pilot, Avior Life Sciences recommends:
Full-scale integration of nanobubble systems at Pirana STP.
Zonal deployment for pre-aeration, final polishing, and
sludge pits.
24×7 monitoring of DO and BOD levels to optimize
performance.
Reduction in chemical usage and associated costs.
AMC collaboration for replicating across Ahmedabad’s decentralized STPs.

Visible Difference

→ Noticeable clarity improvement in water.
→ Odor significantly reduced within hours.
→ Floating sludge visibly broken down.
WhatsApp Image 2025-10-16 at 9.01.06 PM
Result comparisons before (08/05/2025) and after (10/06/2025) show remarkable improvement:
Parameter Before Treatment After Treatment Remarks
TDS
750 mg/L
550 mg/L
27% reduction in dissolved solids
pH
6.09
7.50
Shifted to optimal neutral range
Turbidity
5 NTU
3 NTU
Improved clarity
Hardness (CaCO₃)
150 mg/L
130 mg/L
Safer for skin contact and irrigation
Ammonia
1.5 mg/L
<0.5 mg/L
Successfully eliminated
Reactive Silica
<5 mg/L
<5 mg/L
Within potable limits

Recommendations

Based on the success of the pilot, Avior Life Sciences recommends:
→ Full-scale integration of nanobubble systems at Pirana STP.
→ Zonal deployment for pre-aeration, final polishing, and sludge pits.
→ 24×7 monitoring of DO and BOD levels to optimize performance.
→ Reduction in chemical usage and associated costs.
→ AMC collaboration for replicating across Ahmedabad’s decentralized STPs.

Conclusion

This pilot has demonstrated nanobubble technology as a disruptive, cost-effective, and scalable approach to improving STP performance. With unmatched results in very short time, Pirana STP now stands as a successful benchmark for next-generation wastewater treatment in India.
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