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Water Quality Analysis of the Steel City, Rourkela (Odisha)

Trinath Biswal*, A. K Mahapatra, P. K Kar, R. B Panda

Department of Chemistry, VSS University of Technology, Burla-768018, Odisha

Abstract: Water is the elixir of life. It is one of the most essential and important commodities required for a healthy society. In this paper, an attempt was taken to evaluate the water quality for both surface water and ground water in and around Rourkela, the Steel City of Orissa. The evaluation involves the study of meteorology, hydrogeology, demography and analysis of physico-chemical parameters. From analyzed data, it was found that, except a few all other parameters are not within the permissible limit. The overall water quality for drinking purposes belongs to poor to very poor quality but the water quality for agricultural purposes are found to be suitable. Panpose area is the major polluting part of surface water in river Brahamani. In most of the areas the physico-chemical parameters of both ground water and surface water are found to be much higher than the permissible limiting value.

Keywords: DO, BOD, TDS, PAH, Ammonical Nitrogen

Citation: Trinath Biswal, A. K Mahapatra, P. K Kar, R. B Panda, Water Quality Analysis of the Steel City, Rourkela (Odisha). American Journal of Water Resources, 6 (2). 65-70. January 2018. doi:10.12691/ajwr-6-2-4

1. Introduction

The City Rourkela is very near to the Howrah- Mumbai railway line. Its latitude is 220 -12’ N of equator and longitude is 850 east of meridian. This steel city is situated an altitude of 219 meters above sea level. The river Brahmanimerges at Vedvyas which is the union point of two rivers namely “Shankha”’ and “Koel”. Because of the locational advantages of Rourkela Steel Plant. the fertilizer Plant, nearby Captive Power Plant, Heavy. Refractory material Units, Cement factories, explosive plants, distillery plants, sponge iron units and almost 300 small and medium scale industries are located in and around city of Rourkela and owing to the discharge of huge amounts of liquid effluents from these industries, sewagewater disposalof thesteel city, the river Brahmani is heavily polluted. The surface water bodies (Ponds, tanks and still water bodies) are also polluted because of heavy discharge of industrial effluents and also domestic waste water.The heavy pollution load in water is an alarming and builds fear among the inhabitants surviving its bank and cause of danger to the aquatic life. Therefore, the water quality parameters of the river Brahmani along with the pollution load of different regions should be collectively studied. The common industries which causes the major sources of pollution in the city are as follows. [1,2]

a) Rourkela Steel Plant

b) Fertilizer Plant (SAIL)

c) Captive Power Plant

d) IDL Industries limited

e) Shiva Cement Limited

f) Lotus Chemicals

g) Konark Chrome Chemicals

h) Siddharth Chemicals

i) Golcha Pigments

j) Shanta Chemicals

k) GN Colours & Chemicals Ltd.

2. Surface Water Quality

Brahmani is the second largest river of Orissa which originates by the confluence of river Sankh and Koel at Rourkela. It has the drainage area of about 39,033 Sq.KM having drainage length of 800 KM. The annual average discharge of the river is 8310 MCM of water to Bay of Bengal. Rourkela Steel Plant discharges its treated and untreated waste water through its polishing pond, lagoon at Panposharea, which is the major polluting source of Brahmani at both downstream and upstream of confluence of waste water reveals the pollution of river. Table 2-3 indicates some selected water quality parameters in the year 2016-17 at the up-stream and down-stream of confluence. The Central Pollution control board has classified the water of riverBrahmani (Except in the tidal zone) as Class-C water on the basis of its designated best use, which means that the water should be suitable for public water supply after conventional treatment and disinfection. The designated best use classification of river water is indicated in Table -5. The results obtained from the analysis of both upstream and downstream water quality compared with the acceptable limit table which shows that the pH value is less than the prescribed limit of Class-C water. The Ammonical Nitrogen in the downstream water remains squarely high throughout the year in the downstream areas. The reason of such higher Ammonical Nitrogen in the downstream can be attributed to the fact of release of industrial waste water containing such pollutants. But there is no standard prescribed for the parameter in the classification of water on the basis of designated best use. The important parameter is the BOD value should be less than 3 mg/I in Class-C water which is not so, in the downstream of confluence of waste water discharges. [3,4]

High value of total coliform has been observed throughout the year. Since the untreated sewage from Rourkela City is discharged directly to the river, such high value of coliform is found in the downstream water. Earlier, the sewage along with industrial waste was passing through the existing polishing pond of Rourkela Steel Plant, but after segregation of industrial waste from waste water coming from the municipality area by constructing the parallel drain in order to decrease hydraulic load of the lagoon, the sewage along with storm water of the town is being diverted and discharged directly to the river Brahman without any treatment. The total coliform level remains more than the standard for Class-C The river water particularly unfit for drinking directly. However, the presence of coliform in water as described above cannot be ascribed to industrial pollution. [5,6]

In addition to the existing pollution control measures adopted by RSP, additional measures are necessary for treatment of both liquid and solid discharge so as to meet the required standard prescribed by the State Pollution Control Board for discharge into inland surface water body.

Table 1. DRINKING WATER STANDARD (Manual on water supply & Treatment)

Table 2. WATER QUALITY OF RIVER BRAHMANI (Up-stream)

Table 3. WATER QUALITY OF RIVER BRAHMANI (Down Stream)

Table 4. Classification of water selected on the basis of use

Table 5. TOLERANCE LIMITS FOR IN LAND SURFACE WATER SUBJECT TO POLLUTION

3. Quality of Lentic Water Bodies

Water from Ponds, tanks and still water bodies are important integral part of social life of people in water scarcity areas., where community water supply has not been provided in some part of the urban area or in encroached or unauthorized dwellings developed in the city which do not have a regular water supply by the urban services department, those still water bodies are very important and are used for a variety of purposes. The quality of those lentic water bodies, over the years undergo deterioration in their quality due to rapid silting abuse by the ever increasing population and other natural damages. Since the water of the ponds near habitation is used for bathing and drinking purposes apart from adverse effect on ecology and aquatic life bathing also pose serious health hazard to the people. Various pathogenic microorganisms cause transmission of various diseases. Since bathing is the medium through which the diseases are transmitted, hence for this reason it is considered as one of the important criteria and the stipulated standards in the classification of fresh water bodies. [7,8,9]

4. Quality of Study

The solid waste produced from both the industrial, domestic sources and hospital wastes are usually thrown on the land surface. Depending upon the characteristics of the substances thrown on land surface leaching takes place which causes contaminating the soil as well as ground water due to percolation of leachate produced from it. Rourkela Steel Plant has two numbers of dump yards outside its industrial premises for dumping of different solid wastes generated from its various sources. [10,11] There is also one Municipal refuse dump Yard in the city used for land filling by dumping garbage. The domestic as well as industrial wastes contains some of the offensive materials which not only causes toxic e effect over the land surface but also if the material leached into the ground it can contaminate the ground water. [12,13] This is the cause of the dispersal of water borne diseases due to the leaching action of urban waste and effluents at several parts of our earth. Keeping the above point in view, the open dumping of both industrial as well as domestic waste materials should be restricted. Ten ground water samples (Tube Well water) have been collected from different corners of the area. The details of the locations of sampling points has been indicated in Table 6.

To assess the ground water quality in Rourkela City a total of ten numbers of ground water samples have been collected (all from deep tube wells). The sampling points have been selected according to the location and further use. Most of the locations selected are in thickly populated areas and the tube well caters to the needs of demand for domestic use. The water quality which is found in deteriorated condition would cause damage and affect the health of population in that locality.

A brief illustration of the physic chemical parameters as found from the analysis of the samples is given below:

pH: The lower value of pH below 4.0 produces a sour taste and the higher value of pH above 8.5 has an alkaline taste. A higher pH not only accelerate the scale formation in pipes but also reduces the germicidal potential of Chlorine. The pH of water in the area varies from 5.33 to 7.06. The lowest value of 5.5 has been recorded at REC campus which may be due to the high iron content found to be 6.9 mg/l. Major use of that tube well water is for drinking purpose and people complain about incipit taste after cooking. The maximum value of pH is found at Civil township area (7.06) which is almost in the neutral range. All other values of pH as found out are within the safe limit.

Conductivity: It is a rapid method to have some idea about the dissolved solids present in water samples. A higher value of conductivity of water sample indicates soluble solids thereby indicating presented of pollutants. The values recorded for conductivity in water samples collected in Rourkela area are within tolerable range. The minimum value of 91 mg/l has been found at the water sample collected from REC campus and the maximum value of 854 has been found out at Lal Tanki area.

Table 6. (LOCATION OF SAMPLING POINTS)

Table 7.PHYSICO CHEMICAL ANALYSIS OF GROUND WATER SAMPLES

Total Dissolved Solids: TDS represents mainly various types of minerals present in the water sample. The presence of dissolved solids is a significant parameter in drinking water quality and other water quality standards. It causes a particular taste to the water if the concentration is high it reduces the palatability of water. The TDS value found in the water samples of Rourkela in the range of 90 mg/l to 488 mg/l where the minimum value is found at REC campus and the maximum at Lal Tanki area. All the water samples having TDS in the above range are non/saline in nature according to the US Geological Survey Classification. And also the values are much below the prescribed WHO standard of 500 mg/l.

Total Alkalinity: The capacity of water to neutralize the acid. is known as alkalinity in itself is not harmful to human health but the portable water supply should have Alkalinity below 100 mg/l. The values obtained for Alkalinity in the water samples are in the range of 34 mg/l to 282mg/l/.

Total Hardness: It causes no adverse effect on health and generally hardness below 75 mg/l is termed as soft water and the above 150 mg/l is termed as hard water. A value of hardness more than 300 mg/l is classified as very hard and not useful for domestic uses. The results obtained from the analysis of the water samples indicates the values of total hardness in the range of 32 mg/l to 370 mg/l. The lowest value of 32 mg/l has been found in Basanti Colony area indicating the water to be soft whereas the samples at REC, Vedvyas and Tarkera are moderately soft as the values are below 150 mg/l. Two samples at Deogaon and Bondamunda have within 300 mg/l indicating water to be hard and the samples at Laltanki and plant site area are very hard since the values of the hardness has been found to be more than 300 mg/l. This is due to dumping of various solid waste toxic materials by both RSP as well as Municipality Authority which contains some heavy metals, there is a possibility of leaching of the heavy metals into the soil and thereby contaminating the ground water. The maximum permissible level for different heavy metals such as Copper Iron and Zinc are 1.5 mg/l. 1.5 mg/l and 15 mg/l respectively. The copper has not been detected in any of the water samples collected in the area indicating no leaching of copper from either industrial of municipal waste dumping.

The value of Zinc as obtained from the analysis of the water samples collected vary from .01 mg/l to 0.38 mg/l. Since the desired level of Zinc is 5 mg/l. Most of the samples collected has not exceeded the limiting values. However, the result indicates leaching of zinc from the solid waste dumping site confirming the presence of zinc in the waste dumped.

The potable water standard for iron as prescribed by WHO and ICMR is 1.5 mg/l. All the values obtained from the analysis of the water samples for Iron have exceeded the standard value. Even higher values 6.9 mg/l have been found in the water sample collected from REC Campus. And the samples from Vedvyas also indicate 5.3 mg/l. Except these two, no other water sample indicated alarming figure of iron. The value of lead varies from 0.35 mg/l to 0.87 mg/l. The maximum permissible limit for lead as prescribed by WHO is 0.1 mg/l which indicates all of the samples contain higher lead values. At plant site area and in theBondamunda area lead concentration has been found out to be 9.5 mg/l and 8.5 mg/l respectively. Such high values of lead in these two areas might have been caused due to the leaching from industrial waste and municipal waste dumped nearby that area. The lead concentration at different sampling location indicates leaching from the dumping sites as the sites are very nearer to the sampling collection points. The Concentration of Cd and Ni were found in trace level in all the water samples collected indicating no or negligible leaching from the dumped waste.

5. Leaching from Waste Dumps

The integrated iron and steel industry in Rourkela generated various solid wastes during manufacture of various salable product. Such waste differs in composition, characteristic as well as physical state. A part of the waste is also dumped by the unit which may result due to long term exposure causing adverse health effects. The volume of waste generated from RSP dumps about 48% of its total generation of waste on land. This include waste from Coke Ovens, Coal Chemicals Department, Blast furnace, LDBP, Steel Melting Shop, Rolling Mills, Silicon Steel Mills, Foundry, Power Plants, and Fertilizer Plant. As estimated a total of 510,612 Tons of dust and 60,697.02 Tons of Sludge is generated per year from RSP out of which a part of both dust and sludge are dumped on land. [14,15]

Because of the large waste heaps piled in various parts of the area due to dumping of the waste generated from RSP, not only the visual amenity gents affected but also it becomes anaesthetic. Such open dumping not only contaminate the nearby area but also substances dumped on top becomes wind borne and creates dust nuisance in the locality. There has been no barrier developed around the dump heaps which could arrest windblown material. This is also a factor for increase in SPM levels in the locality.

Water samples from the Test Well in the dump yard area has also been collected in order to assess if any leaching of materials is caused from the solid waste dumped by RSP. Six of such test wells have been identified and the details of analysis of water with respect to heavy metals leached into the ground are mentioned in Table 8.

Table 8. GROUND WATER QUALITY (TEST WELL WATER) in PPM

It has been observed that all the water studied, contains high level of Zn, Cu and Pb which must have been leached from the industrial waste material dumped indiscriminately on the land. The level of copper in the water has been found to be in the range of .42 to 10.5 mg/l. The highest value of copper of 10.5 mg/l has been found at BF slag dump area. Such high value of copper in ground water is unusual and required further study in order to arrive at any concrete reasoning of such high figure. Since the source of the water is near the BF slag dump area, the leaching of the metal from such waste may not be ruled out.

The value of Zn in few of the water samples have also been found to be in the higher range such as 2.95 – 5.5mg/l. The highest value of 5.5 mg/l has been observed inside the fertiliser plant area This could be due to the leaching of the metal from the dumping of used Zn catalyst inside the plant. The value of Lb in most of the water samples from iron and steel slag dump area has been observed to be more or less uniform and found in the range of 2.21 – 2.62 mg/l (maximum permissible limit is 0.1 mg/L).

6. Conclusion

RSP generates huge amounts of waste substances (solid waste, waste water) during the process of manufacturing of iron and steel. Other different small and large scale industries and domestic waste of the city alsoproduces huge amountsolid and liquid waste, which mixed with both ground water and surface water. The water pollution problem in this city are of two types. The industrial waste water which is partially meeting the prescribed norm of discharged water quality is discharged into the river Brahmani . The water pollution study of river Brahmani with respect to some important parameters in the downstream stretches indicating pollution load of water due to industrial as well as domestic sewage discharge. Such untreated discharge of waste will enhance the pollution load of river water making it unfit for human use. The variation of PH of the water samples is uniform throughout and remains consistent except few occasion. The parameters BOD, COD and Ammoniacal nitrogen in the downstream water of river Brahmani are in much higher side indicating the heavy pollution level of river. The higher values of BOD have been caused not only due to the industrial source but also due to the discharge of untreated sewage from the city area to the river directly without any treatment. The higher values of Ammonical nitrogen may be attributed to the release of the pollutant from the industrial sources only. The much higher values of heavy metal in both surface and ground water is due to heavy industrial pollution. Therefore, the present study reveals that concerted effort is required by all segments of the society including the Govt., industries public in general for environmental protection before the assimilative capacity of the environment becomes saturated.

7. Recommendation

1. The industries in and around Rourkela should adopt effective pollution control measures for control of water pollution.

2. Apart from making PUC certificate mandatory, there should be frequent surprise checks and penalties as per the Act should be imposed on the defaulters.

3. RSP and other industries must treat their waste water at each source to meet the quality criteria before discharge and the existing lagoon be considered as the polishing pond to take care only in upset condition.

4. There should be common waste effluent treatment plant (CETP) for treatment of waste water generated from small scale industries.

5. The municipal sewage water and domestic waste water should be completely treated before mixed with surface water or soil.

6. Rourkela municipality should take one or more best option for disposal of solid waste and hazardous waste generated from industries.

References

[1]   | NaikShrikanta. Studies on pollution status of Bondamunda area of Rourkela industrial complex, (2005).
[2]   | Pande K. S. and Sharma, S.D. (1999) Pollution Research 18 (3): 335-338.
[3]   | Singh T.B., Indubala and Devendra Singh (1999) Pollution Research 18 (1): 111-114.
[4]   | Srivastava, R. K. and S. Srivastava (2003). Assessment of water quality of river Gaur at Jabalpur. Indian J. of Env. Protection, 23(3): 282-285.
[5]   | Kaur, H., J. Syal and S.S. Dhillon (2001). Water quality index of the river Satluj. Poll Res., 20(2): 199-204.
[6]   | Pani, B.S. (1986). “Outfall diffusers”. In. Abstract of the National Seminar on Air and Water Pollution, April 1986, University College of Engineering, Burla.
[7]   | Amman, Adrian A., Eduard Hoehn and Sabine Koch (2003). Groundwater pollution by roof infiltration evidenced with multi-tracer experiments. Water Research,37(5): 1143-1153.
[8]   | Sinha, D. K., S. Saxena and R. Saxena (2004). Ram Ganga river water pollution at Moradabad –A physico-chemical study. Indian J. of Env. Protection, 24(1): 49-52.
[9]   | Akshaya K Bhadra1, Nirmal K BhuyanBaidharSahu, Swoyam P. Rout. (2014) Assessment of the Water Quality Standard of Brahmani River in terms of Physico-Chemical Parameters 2(12): 1765-1772.
[10]   | PradyusaSamantaray, Basant K. Mishra, Chitta. R. Panda and S. P. Rout (2009) Assessment of water quality index in Mahanadi and Atharabanki rivers and Taladanda canal in Paradip area, India, J. Hum. Ecol. 26(3) 153-161.
[11]   | B.C.Singh and U.K.Mohapatra(1998) Physico-chemical and Bacteriological Parameters in various sources of Drinking water in the old Capital City of Cuttack, J.T.R. Chem.5(1). 44-50.
[12]   | Memon, M.; Soomro, M.S.; Akhtar, M.S.; Memon, K.S. (2011) Drinking water quality assessment in Southern Sindh (Pakistan). Environmen. Monit. Assess., 177, 39-50.
[13]   | Cobbina, S.J.; Nyame, F.K.; Obiri, S (2012) Groundwater Quality in the Sahelian Region of Northern Ghana, West Africa. Res. J. Environ. Earth. Sci. 4, 482-49.
[14]   | Panda, R, B, and etal (1991) A comparative study of ground water vs surface water in the basin of the river Brahmani at Rourkela Industrial complex, J. Eco Toxicol. Env Monitoring 1 (3), 206-217.
[15]   | Panda, R.B., Karim A.A. (2014) Assessment of Water Quality of Subarnarekha River in Balasore Region, Odisha, India, Current World Envionrment Vol 9(2), 437-446.