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Table 2

CBA of conventional STPs and various NTS models suitable at urban, peri-urban and rural areas

 STP (Conventional)NTS-CW at urbanNTS models at peri-urban
CW as single outlet at rural village
Existing natural wetlandEngineered natural wetlandCW-Mini wetland for individual farmers
Capital costa (Indian Rupees ₹ in Lakhs, (US$)) ₹ 68.00/MLD (US$ 103,371) (source: CPCB 2013) ₹ 31.50/MLD (US$ 47,885) (For wetland Size: 40 m × 30 m × 3 m) Nil ₹ 5.00/5 MLD (US$ 7,591) (To divert wastewater to low lying areas up to max. 100 m) ₹ 1.44/0.05 MLD (US$ 2,186) (For only CC wall size: 10 m × 6 m × 3 m) ₹ 4.32/ 0.2 MLD (US$ 6,558) (CC wall and base of size: 20 m × 12 m × 3 m) 
Operation and maintenance cost (₹ in Lakhs) ₹ 0.3/month/MLD (US$ 455) (source: CPCB 2013) ₹ 0.03/3 months (US$ 45) (for analysis of influent and effluent quality) ₹ 0.03/3 months (US$ 45) (for analysis of influent and effluent quality) ₹ 0.03/3 months (US$ 45) (for analysis of influent and effluent quality) ₹ 0.03/3 months (US$ 45) (for analysis of influent and effluent quality) ₹ 0.03/3 months (US$ 45) (for analysis of influent and effluent quality) 
 STP (Conventional)NTS-CW at urbanNTS models at peri-urban
CW as single outlet at rural village
Existing natural wetlandEngineered natural wetlandCW-Mini wetland for individual farmers
Capital costa (Indian Rupees ₹ in Lakhs, (US$)) ₹ 68.00/MLD (US$ 103,371) (source: CPCB 2013) ₹ 31.50/MLD (US$ 47,885) (For wetland Size: 40 m × 30 m × 3 m) Nil ₹ 5.00/5 MLD (US$ 7,591) (To divert wastewater to low lying areas up to max. 100 m) ₹ 1.44/0.05 MLD (US$ 2,186) (For only CC wall size: 10 m × 6 m × 3 m) ₹ 4.32/ 0.2 MLD (US$ 6,558) (CC wall and base of size: 20 m × 12 m × 3 m) 
Operation and maintenance cost (₹ in Lakhs) ₹ 0.3/month/MLD (US$ 455) (source: CPCB 2013) ₹ 0.03/3 months (US$ 45) (for analysis of influent and effluent quality) ₹ 0.03/3 months (US$ 45) (for analysis of influent and effluent quality) ₹ 0.03/3 months (US$ 45) (for analysis of influent and effluent quality) ₹ 0.03/3 months (US$ 45) (for analysis of influent and effluent quality) ₹ 0.03/3 months (US$ 45) (for analysis of influent and effluent quality) 

aCost as per the present market rates as (a) CC construction charges ₹ 1,500/m2 and (b) filling material ₹ 3,000/15 m3 (truck carriage capacity); MLD-million L/day; ML-million Liters; CC-concrete construction.

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