The Punjab Pollution Control Board confirms that human excreta is the main source of pollution in the state’s rivers including the Beas, Ghaggar and Ravi resulting in various diseases, including typhoid, dysentery, cholera, hookworm diseases, ascariasis and viral hepatitis.
Contamination and pollution
In the Satluj, which is a river that traverses a long distance in Punjab, the concentration of faecal coliform varies from 2,800 to 40,000 per 100 ml. The Ghaggar river reaches a maximum
faecal conliform level of 27,000 per 100 ml before it exits Punjab. Nitrates is one of the contaminants indicating inadequately treated sewage water, run-off, and poorly functioning septic systems. High nitrate causes growth of algae and other plants in surface water bodies, seen invariably in village ponds.
According to a 2010 report of the Central Ground Water Board, groundwater samples from 17 of the then 20 districts in Punjab were found to have nitrates more than the permissible limit of 45 mg/l going to a maximum of 1,180 mg/l at a village in Sangrur.
Nitrates in the groundwater can also originate from the leaching of chemical fertilizers which are used abundantly in Punjab. However, a
report by Greenpeace analysing the impact of fertilizer use on groundwater, found that the levels of nitrates from wells inside two villages were much higher (110.7 and 601.6 mg/l) than those in the fields (7.4 to 94.3 mg/l) where nitrogen fertilizers are used.
The report noted that high nitrate contamination of groundwater within the village is probably due to the concentration of human sewage and cattle waste. For drinking water, the permissible limit of nitrates is 45 mg/l.
Nitrate-contaminated water has been linked with 15 types of cancers, metabolic disorder, birth malformations, hypertension and spontaneous abortions in animals. The incidences of all these conditions are rising in Punjab but with little investigation into reasons and sources of contamination.
Few existing solutions
With high coverage and community demand, Punjab can’t stop building toilets which is why it is imperative that cost-effective methods of safe sewage disposal are implemented. Conventional sewage treatment plants are power intensive, have huge capital costs and add to unaffordable operation and maintenance cost. This is the reason most STPs in cities remain non-functional.
Certain villages have come up with solutions to this through efforts of wealthy NRIs, religious organisations and lately, the state government. This involves the laying of sewer lines and the conversion of existing village ponds into stabilisation units to treat sewage water through the natural action of sunlight, wind, bacteria and algae. This treatment system costs Rs 25 lakh with Rs 90,000 towards annual maintenace.
But a bigger investment is in terms of land as the requirement may go upto 3 acres. While it may not be an issue for villages that already have large ponds, others have to spare panchayat land for this purpose. Since the system does not require electrical energy, the maintenance cost comes out to be Rs 90,000 for one million litres of sewage per day.
At Chakar village of Ludhiana, three Canadian NRIs pooled in money to improve the prevailing insanitatory conditions. Today, the village has three sets of stabilisation ponds serving separate localities. In a stabilisation-based treatment system, wastewater flows through 3-4 ponds one after another under the influence of gravity with a minimum detention time of 6-8 days. Most of the heavy solids sink to the bottom of the first pond while the remaining water flows to the second, shallower pond. Here, healthy growth of algae produces oxygen to be used by bacteria to break down organic matter.
The water further goes to the one or two maturation ponds where sunlight kills off most of the faecal bacteria and other pathogens. The water is then used for irrigation in nearby fields thus completing the cycle of consumption and reuse. Sullage can also be removed from the ponds after a few years and used in the fields as manure.
At Harar Khurd village in Amritsar district, work is on to connect toilets to the main sewer line under a World Bank- supported water supply and sanitation project. Toilets have been constructed with septic tanks that don’t allow seepage into the ground. Underground sewerage takes the solid-free wastewater to stabilisation ponds. In total, 98 villages have already been covered through the World Bank-sponsored project. However, that's only half a solution since the sludge of the individual septic tanks would need to be removed after a couple of years and there is no provision for its safe disposal.
At Bahadurpur village of Rupnagar district, villagers got together under the leadership of NRI Dilbagh Singh to set up a 4,000 feet sewer and drainage system. Earlier, the village consisting of 80 small landholder famlies was diverting sewage directly into the Satluj flowing nearby. Now three stabilisation ponds have been made on the outskirts, so the water goes through underground pipes and moves on after the sludge settles down.
All families were asked to contribute Rs 5,000 each for the development work. “Some families could not afford to donate while a few rich families gave lakhs. This helped attach value to the infrastructure”, informs Dilbagh Singh. The animal waste from village dairy farm is diverted to a centrally-located biodigester which supplies biogas to those who pay user charges of Rs 100 per month.
As inspiring as these instances may sound, they are very few and far between. In the coming years, Punjab will have a greater crisis at hand as more people shift to toilets, and sewage waste continues to pollute surface and groundwater while treatment faclities remain dysfuctional for want of funds.
