Free flow

Water: industry is misusing it, but for how long?

 
Last Updated: Sunday 28 June 2015

Free flow

-- (Credit: Amit Shanker / CSE)Currently, industry guzzles about 22 per cent of the total freshwater used worldwide. By 2025, this figure is expected to go up to 24 per cent, says the World Bank's World Water Development Report 2001.

In India, of all the categories of water use, industrial water use is rising the fastest. According to the Central Pollution Control Board (CPCB), water consumption by industry accounts for about 8 per cent of the total national use. By 2050, industry will need almost four times the water it uses now.

But will it get this water? Highly unlikely. Water is already a source of conflict between communities and industry. In December 2002, the Coca-Cola plant in the drought-prone Perumatty village in Kerala's Palakkad district, faced serious opposition from the local community and politicians for depleting and polluting drinking water resources. The growing scarcity of water is also taking its toll on economic development. A recent study (Investment Climate in India, 2003) by the Confederation of Indian Industry and the World Bank has found that scarcity of water in Tamil Nadu is proving to be a major infrastructural bottleneck and a hurdle for investments in the state.

With more clamour for the resource every year, the future presents a grim picture. The challenge for Indian industry is, therefore, to stay a step ahead of the crisis by becoming water-efficient.

Water and the Indian industry
Industry's use of water acts as a double-edged sword: it puts immense pressure on local water resources, and it devastates the environment through wastewater discharge. Essentially used as input, mass and heat transfer media and for other miscellaneous purposes, a very small fraction of the water is actually consumed. About 90 per cent of the water used in major water-consuming industries is ultimately discharged as wastewater. According to the CPCB, in 2001, Indian industry consumed 40 km 3 of water and discharged 30.31 km 3 of wastewater. The issue of water use in industries, therefore, has to be addressed within these two interlinked paradigms.

Industry does not only use up a lot of water, it does so in an extremely inefficient manner. Compared to globally acceptable standards, the water consumption efficiency (water consumed to produce a unit product) of Indian industry is dismal (see table below: Guzzlers Inc). Thermal power plants (TPPs) are the major consumers, accounting for a staggering 88 per cent of the total water consumed by industry (see table below: Water use). In a scenario where the availability of water is dipping alarmingly, this is a recipe for disaster.

Water use
Lion's share: power plants

Sectors Water
consumed
(mld)*
Proportion
consumed
(per cent)
Thermal power plants 82,194 87.87
Engineering 4,722 5.05
Pulp and paper 2,118 2.26
Textiles (cotton) 1,940 2.07
Iron and steel 1,208 1.29
Sugar 509 0.54
Fertilisers 456 0.49
Distilleries 172 0.18
Organic chemicals 114 0.12
Others 111 0.12

Note: *Estimates based on wastewater discharge, assuming wastewater volume is 90 per cent of the water used in the industry.
Source: Water Quality in India -- Status and Trends (1990-2001), CPCB & MEF

Pricing: a licence to abuse
One of the main reasons Indian industry wastes water wilfully is because it costs almost nothing to do so. Companies pay a ridiculous 10 paise for 1,000 litres of water; in contrast, people in some cities end up paying between Rs 10-50 for the same quantity.

Recently, the government amended the Water (Prevention and Control of Pollution) Cess Act, 1977 and introduced a revised water cess for industry. T R Baalu, Union minister of environment and forests, while presenting the bill in parliament, proclaimed that the new cess would augment the resources of Central and state pollution control boards, promote economy in the use of water, and stop its pollution by industries. The new rates, explained the minister, are about three times higher than the existing rates.

Guzzlers Inc
Indian industry: inefficient consumer
Sector Average water consumption Global standard
Thermal power plant About 80 m3/mwh electricity4 Less than 10 m3/mwh electricity1
Textiles 200-250 m3/tonne cotton3 Less than 100 m3/tonne cotton1
Pulp and paper:
Wood-based mills
Waste paper-based mills

150-200 m
3/tonne3
75-100 m
3/tonne3

50-75 m
3/tonne2
10-25 m
3/tonne2
Integrated iron and steel plant 20-25 m3/tonne of finished product3 5 m3/tonne of finished product5
Sources: 1. Pollution Prevention and Abatement Handbook, World Bank, 1998; 2. Green Rating Project (GRP), CSE, 1999; 3. Environmental Management in Selected Industrial Sectors - Status and Needs, CPCB and MEF, 2003; 
4. No credible data available. Estimated by GRP from wastewater discharge data from Water Quality in India -- 
Status and Trends (1990-2001), CPCB and MEF and annual electricity generation data from Annual Report (2001-02) on the Working of State Electricity Boards and Electricity Departments, Planning Commission; 
5. Integrated Pollution Prevention and Control (IPPC): Best Available Techniques, Reference Document on the Production of Iron and Steel, 2001
But a close scrutiny of the new cess exposes the sham underneath. It shows that the amendment to the act will do nothing more than generate resources for pollution control boards. The revised cost of water is still so low that it is imbecilic to expect industry to be pushed by it to improve its water-use efficiency. For instance, the consumption of water in industrial cooling is three times its consumption in processing. But the new bill has pegged the cost of water for industrial cooling, spraying in mine pits or boiler feeds at a mere 10 paise/kilolitre (kl) -- two-three times less than the cost for process water (see table below: Cheap!). At this rate, the cooling water cess of TPPs, for instance, will constitute just 0.20 per cent of their total power generation costs (see table below: For instance: 0.265 per cent). The act's introduction of such low costs for cooling water has swept away hopes of any water conservation efforts for three-fourth of the water consumed by Indian industry.

Cheap!
Industry pays a pittance
Water consumed for Old rate* New rate**
Industrial cooling, spraying in mine pits or feeding boilers 5 paise/kilolitre (kl) 10 paise/kilolitre (kl)
Domestic purposes 2 paise/kl 3 paise/kl
Processing1 10 paise/kl 20 paise/kl
Processing2 15 paise/kl 30 paise/kl
Note: * As per sub section (2) of section 3; 
** As per sub section (2A) of section 3
1. whereby water gets polluted and the pollutants are:
(i) easily biodegradable; or (ii) non-toxic; or 
(iii) both non-toxic and easily biodegradable 
2. whereby water gets polluted and the pollutants are: 
(i) not easily biodegradable; or (ii) toxic; or 
(iii) both toxic and not easily biodegradable 
Source: Water (Prevention and Control of Pollution) Cess (Amendment) Act, 2003, ministry of environment and forests
Costs fixed for process water are as illogical. Companies in Gujarat and Tamil Nadu are already paying third parties Rs 10-25/kl for process water; an increase of a mere 20-30 paise will not make any difference.

Integrate to survive
To successfully confront the challenge of water, Indian industry will have to aim at zero freshwater demand and zero effluent discharge. So far, water management in Indian industry has revolved around two basic aspects: raw water treatment to meet end-use requirements and effluent treatment for meeting discharge standards. Isolated, but noteworthy, examples of innovation do exist: the Chennai Petroleum Company Limited, for instance, treats municipal sewage to meet its process water requirements and is on its way to close its water cycle as well.

For instance: 0.265 per cent
Of money spent on power is the cost of water!
Total power produced by thermal power plants (million kwh) 372322.00
Cost of power generation (Rs/kwh) 3.27**
Total cost of generation (Rs crore) 121860.99
Cooling water cess as percentage of power generation cost 0.20
Total water cess as percentage of power generation cost 0.265
Note: **Revised estimate
Source: Annual Report on the Working of State Electricity Boards and Electricity Departments, 2001-2002, Planning Commission
But with the deepening crisis of water availability, an integrated approach involving water treatment, source reduction, reuse of process water, effluent treatment, recycling of treated effluent and waste-minimisation is the need of the hour. The components of such an integrated water management plan could include the following options:

IMPROVEMENTS IN PROCESS TECHNOLOGY: By adding water-efficient technologies

REUSE OF PROCESS WATER: Reusing process water in series in an open system for two or more successive but different processes

RECIRCULATION OF WATER: Indefinite use of non-consumptive water like cooling water and steam condensate for the same purpose after treatment

RAINWATER HARVESTING: Collecting water within the plant's rainwater endowment; for low water-consuming industries, it could meet their entire requirements.

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