Lok Sabha Question No. 2296 (UNSTARRED), answered on 2016-03-10
Subject: Processing of Waste Water for Power Plants
Ministry: NEW AND RENEWABLE ENERGY
Asked by: RAKSHA NIKHIL KHADSE

## GOVERNMENT OF INDIA MINISTRY OF NEW AND RENEWABLE ENERGY

## LOK SABHA UNSTARRED  QUESTION NO. 2296

TO BE ANSWERED ON 10.03.2016

## PROCESSING OF WASTE WATER FOR POWER PLANTS

2296.  SHRIMATI RAKSHATAI KHADSE:

Will the Minister of NEW AND RENEWABLE ENERGY be pleased to state:

- (a) Whether  the  Government  proposes  to  process  and  convert  the  waste  water generated particularly in urban areas into usable water (need not be potable) which can be used by power plants like NTPC; if so, the details thereof;
- (b) Whether the Government has framed/proposes to frame any norms in this regard; and
- (c) If so, the details thereof?

## ANSWER

## THE MINISTER OF STATE FOR POWER, COAL & NEW AND RENEWABLE ENERGY (INDEPENDENT CHARGE) (SHRI PIYUSH GOYAL)

- (a): Yes  Madam,  as  per  clause  6.2(5)  of  the  revised  Tariff  Policy  notified  on 28.01.2016 by the Ministry of Power, Government of India, the thermal power plant(s) including the existing plants located within 50 km radius of sewage treatment plant of municipality/local bodies / similar organization shall in the order of their closeness to the sewage treatment plant, mandatorily use treated sewage water produced by these bodies and the associated cost on this account be allowed as a pass through in the tariff. Such thermal plants will also ensure back-up source of water to meet their requirement in the event of shortage of supply by the sewage treatment plant. The associated cost on this account shall be factored into the fixed cost so as not to disturb the merit order of such thermal plant. The shutdown of the sewage treatment plant will be taken in consultation with the developer of the power plant.

(b)&(c): The Manual on Sewerage and Sewage Treatment Systems, published by the  Ministry  of  Urban  Development  in  2013,  recommends  norms/quality  of  treated sewage for various specified activities including industrial use. The typical guidelines for cooling water quality, as per the Manual, are given at Annexure.

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## Annexure

## Annexure referred to in reply to parts (b)&(c) of Lok Sabha Unstarred Question No. 2296 for 10.03.2016

## Table 7.15 of the Manual on Sewerage and Sewage Treatment Systems for Cooling Water Quality Guidelines

| S. No.                      | Parameter/Condition                                                    | Recommended Value                                                                                          |
|-----------------------------|------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------|
| (A)In make-up-water         | (A)In make-up-water                                                    | (A)In make-up-water                                                                                        |
| 1                           | pH                                                                     | 6.8-7.0 (variation less that 0.6 units in 8 hours                                                          |
| 2                           | Average TDS value (with variation +25% permissible on 8 hours average) | Cycles of concentration in re- circulating water                                                           |
|                             | 3,000 mg/l                                                             | 2.0                                                                                                        |
|                             | 1,000 mg/l                                                             | 3.5                                                                                                        |
|                             | 500 mg/l                                                               | 6.0                                                                                                        |
| 3                           | Oil and grease                                                         | Absent                                                                                                     |
| 4                           | BOD (5 day, 2 0 C)                                                     | Less than 50 mg/l                                                                                          |
| 5                           | Chlorides (CI)                                                         | Less than 175 mg/l                                                                                         |
| 6                           | Ammonia                                                                | No appreciable amount                                                                                      |
| 7                           | Caustic alkalinity                                                     | Absent                                                                                                     |
| 8                           | Methyl orange alkalinity (as CaCO 3 )                                  | Less than 200 mg/l                                                                                         |
| (B) In re-circulating water | (B) In re-circulating water                                            | (B) In re-circulating water                                                                                |
| 9                           | Silica (As SiO 2 )                                                     | Less than 150 mg/l                                                                                         |
| 10                          | Phosphates, sulphates                                                  | Not to exceed solubility limit than 1 minutes after 10 seconds of vigorous shaking of re-circulating water |
| 11                          | Alkyl Benzene Sulponate (ABS)                                          | Foam not to persist more than 1 minute after 10 seconds of vigorous shaking of re-circulating water        |
| 12                          | Langelier index at skin temperature of heat exchange surface           | 0.5±0.1                                                                                                    |
| 13                          | Ryzner Stability Index                                                 | 6.0 to 7.0                                                                                                 |