Socio-economic background of wastewater irrigation and bioaccumulation of heavy metals in crops and vegetables

Water scarcity is one of the main constraints for agriculture sector in many countries. It pushes the farmers to use wastewater for irrigation as an available alternate, especially in peri-urban areas of developing countries. One of the drawbacks of using wastewater for irrigation is heavy metal pollution in the soil and water along with the toxic elements which enter into the food chain. This study aims at to obtain information about the socio-economic reasons for using wastewater from the farmers’ perspective and analyze the accumulation of heavy metals in wastewater, canal water, underground water, soil and crops, irrigated with wastewater. Two contrasting views were observed among the farmers about wastewater irrigation. Over 90% preferred to use wastewater due to its low cost and rich source of nutrients. Although, farmers know that wastewater irrigation have serious negative effects on human health and the quality of the ground water, they prefer to use it for lowering the cost of production and overcome the scarcity of canal water. The findings of this study showed that, ground water and canal water have more accumulation of Cr, Mn, Pb and Zn than the recommended safe limits. None of the water samples collected from different sources was found to be safe for irrigation due to heavy metal contamination. Wastewater irrigated crops and vegetables were also analyzed to determine the bioaccumulation of heavy metals. Concentrations of Cr, Mn, Pb and Zn were observed more than safe limits in all the analyzed vegetables (spinach, cabbage, cauliflower, mustard leaves and round gourd) and crops (berseem, sorghum, maize, rice, wheat, lucerne, sugarcane). This study showed that poor economic conditions force the farmers to not only sacrifice their own health but also the health of consumers of these crops and vegetables by using wastewater for irrigation.

[1]  S. Mahmood,et al.  Impacts of wastewater irrigation on water quality and on the health of local community in Faisalabad [Pakistan] , 2006 .

[2]  A. Majeed,et al.  Heavy metal status of soil and vegetables grown on peri-urban area of Lahore district , 2013 .

[3]  G. Bitton,et al.  Geohelminthic infections associated with raw wastewater reuse for agricultural purposes in Beni-Mellal, Morocco. , 2000, Parasitology international.

[4]  S. Rani,et al.  Heavy metal accumulation in vegetables irrigated with water from different sources , 2008 .

[5]  Hillel I. Shuval,et al.  Integrated resource recovery : wastewater irrigation in developing countries - health effects and technical solutions , 1986 .

[6]  A. Sharma,et al.  Review of arsenic contamination, exposure through water and food and low cost mitigation options for rural areas , 2014 .

[7]  Dennis Wichelns,et al.  The challenges of wastewater irrigation in developing countries , 2010 .

[8]  Dinesh Mohan,et al.  Impact assessment of treated/untreated wastewater toxicants discharged by sewage treatment plants on health, agricultural, and environmental quality in the wastewater disposal area. , 2004, Chemosphere.

[9]  Gemma Carr,et al.  Wastewater irrigation and environmental health: implications for water governance and public policy. , 2012, International journal of hygiene and environmental health.

[10]  Andre Nel,et al.  Health effects of air pollution. , 2004, The Journal of allergy and clinical immunology.

[11]  P. Drechsel,et al.  Wastewater use in crop production in peri-urban areas of Addis Ababa: impacts on health in farm households , 2010, Environment and Development Economics.

[12]  M. Agrawal,et al.  Health risk assessment of heavy metals via dietary intake of foodstuffs from the wastewater irrigated site of a dry tropical area of India. , 2010, Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association.

[13]  Mohammad Valipour,et al.  Land use policy and agricultural water management of the previous half of century in Africa , 2015, Applied Water Science.

[14]  S. Mishra,et al.  Heavy metals accumulation and distribution pattern in different vegetable crops , 2012 .

[15]  J. Martin-Ortega,et al.  The economic value of guaranteed water supply for irrigation under scarcity conditions , 2012 .

[16]  S. Feenstra,et al.  Health risks of irrigation with untreated urban wastewater in the southern Punjab, Pakistan , 2000 .

[17]  K. Giller,et al.  Uptake of heavy metals by vegetables irrigated using wastewater and the subsequent risks in Harare, Zimbabwe , 2007 .

[18]  Yong-guan Zhu,et al.  Health risks of heavy metals in contaminated soils and food crops irrigated with wastewater in Beijing, China. , 2008, Environmental pollution.

[19]  Muhammad Nawaz Chaudhry,et al.  Physicochemical Properties, Contamination and Suitability of Canal Water for Irrigation, Lahore Branch Pakistan , 2011 .

[20]  M. Bigdeli,et al.  Investigation of Metals Accumulation in Some Vegetables Irrigated with Waste Water in Shahre Rey-Iran and Toxicological Implications , 2008 .

[21]  S. Marinova,et al.  Distribution and Forms of Heavy Metals in Some Agricultural Soils , 2003 .

[22]  R. Saucedo,et al.  Heavy Metal Content in Soils under Different Wastewater Irrigation Patterns in Chihuahua, Mexico , 2008, International journal of environmental research and public health.

[23]  Blanca Jiménez,et al.  Treatment technology and standards for agricultural wastewater reuse: a case study in Mexico , 2005 .

[24]  M. Vasconcellos,et al.  A simplified method for assessing physical activity level values for a country or study population , 2003, European Journal of Clinical Nutrition.

[25]  Anastassiia Vertii,et al.  Heavy Metal Accumulation and Detoxification Mechanisms in Plants , 2001 .

[26]  Anju Pal,et al.  Heavy metal contamination in fruits and vegetables in two districts of West Bengal, India. , 2010 .

[27]  A. Aghabarati,et al.  Heavy metal accumulation in Melilotus officinalis under crown Olea europaea L forest irrigated with wastewater , 2008 .

[28]  Robert C. Cooper,et al.  Public Health Concerns in Wastewater Reuse , 1991 .

[29]  F. Wani,et al.  Accumulation of heavy metals on soil and vegetable crops grown on sewage and tube well water irrigation , 2013 .

[30]  Liqa Raschid-Sally,et al.  Wastewater Use in Irrigated Agriculture: Confronting the Livelihood and Environmental Realities , 2004 .

[31]  Saifullah,et al.  Disposal and Use of Sewage on Agricultural Lands in Pakistan: A Review , 2010 .

[32]  R. Miller.  Nitric-perchloric Acid Wet Digestion In An Open Vessel , 1997 .

[33]  A. T. de Matos,et al.  Mobility of heavy metals as related to soil chemical and mineralogical characteristics of Brazilian soils. , 2001, Environmental pollution.

[34]  M. Qureshi,et al.  Global water crisis and future food security in an era of climate change , 2010 .

[35]  S. I. Omofonmwan,et al.  Effects of Solid Waste on the Quality of Underground Water in Benin Metropolis, Nigeria , 2009 .

[36]  A. Olaniran,et al.  Bioavailability of Heavy Metals in Soil: Impact on Microbial Biodegradation of Organic Compounds and Possible Improvement Strategies , 2013, International journal of molecular sciences.

[37]  G. Murtaza,et al.  Accumulation and implications of cadmium, cobalt and manganese in soils and vegetables irrigated with city effluent , 2008 .

[38]  D. Mara,et al.  Guidelines for the Safe Use of Wastewater and Excreta in Agriculture and Aquaculture: Measures for Public Health Protection , 1989 .

[39]  M. B. Pescod,et al.  Wastewater treatment and use in agriculture - FAO irrigation and drainage paper 47 , 1992 .

[40]  Deepak Shukla.  Analysis of Heavy Metals in Soil and Vegetables Irrigated with Wastewater in Meerut City Region , 2013 .

[41]  Sunderman Fw.  A review of the metabolism and toxicology of nickel. , 1977 .

[42]  Wayne W. Carmichael,et al.  Health Effects of Toxin-Producing Cyanobacteria: “The CyanoHABs” , 2001 .

[43]  J. Jacob,et al.  Assessment of Heavy Metal Bioaccumulation in Spinach, Jute Mallow and Tomato in Farms Within Kaduna Metropolis, Nigeria , 2012 .

[44]  Muhammad Nadeem Zafar,et al.  Assessing Pollution Levels in Effluents of Industries in City Zone of Faisalabad, Pakistan , 2005 .

[45]  L. Rink,et al.  The Essential Toxin: Impact of Zinc on Human Health , 2010, International journal of environmental research and public health.

[46]  Clement O Ogunkunle,et al.  Assessment of heavy metal contents of Lycopersicum esculentum mill. (tomato) and Capsicum chinense l. (pepper) irrigated with treated and untreated detergent and soap wastewaters , 2012 .

[47]  G. Al-Karaki,et al.  Utilization of treated sewage wastewater for green forage production in a hydroponic system , 2011 .

[48]  Pay Drechsel,et al.  Wastewater irrigation and health: assessing and mitigating risk in low-income countries , 2010 .

[49]  A. Ghafoor,et al.  CHEMICAL COMPOSITION OF EFFLUENTS FROM DIFFERENT INDUSTRIES OF THE FAISALABAD CITY , 1994 .

[50]  S. Katz,et al.  The toxicology of chromium with respect to its chemical speciation: A review , 1993, Journal of applied toxicology : JAT.

[51]  R. Ebewele,et al.  Levels of Heavy Metals (Cu, Zn, Pb, Fe and Cr) in Bushgreen and Roselle Irrigated with Treated and Untreated Urban Sewage Water , 2012 .

[52]  M. Ashfaq,et al.  Economic impacts of wastewater irrigation in Punjab, Pakistan , 2011 .

[53]  A. Bhatti,et al.  CONCENTRATION OF METALS IN SEWAGE AND CANAL WATER USED FOR IRRIGATION IN PESHAWAR , 2007 .

[54]  N. Chary,et al.  Assessing risk of heavy metals from consuming food grown on sewage irrigated soils and food chain transfer. , 2008, Ecotoxicology and environmental safety.

[55]  H. Jamal.  Pakistan Poverty Statistics: Estimates for 2011 , 2013 .

[56]  J. Lester,et al.  Heavy metal content of vegetables irrigated with mixtures of wastewater and sewage sludge in Zimbabwe: Implications for human health , 2006 .

[57]  M. E. Argun,et al.  HEAVY METAL ACCUMULATION IN WHEAT PLANTS IRRIGATED BY WASTE WATER , 2006 .

[58]  H. Galavi,et al.  Effects of Treated Municipal Wastewater on Soil Chemical Properties and Heavy Metal Uptake by Sorghum (sorghum bicolor L.) , 2010 .

[59]  J. Árvay,et al.  Heavy metals in productive parts of agricultural plants. , 2012 .

[60]  Mogens Henze,et al.  Wastewater Treatment: Biological and Chemical Processes , 1995 .

[61]  R. K. Rattan,et al.  Long-term impact of irrigation with sewage effluents on heavy metal content in soils, crops and groundwater : a case study , 2005 .

[62]  Carl A. J. Denneman,et al.  Ecotoxicological Risk Assessment as a Base for Development of Soil Quality Criteria , 1990 .

[63]  Jeroen H. J. Ensink,et al.  A nationwide assessment of wastewater use in Pakistan: an obscure activity or a vitally important one? , 2004 .

[64]  M. Ozores-Hampton,et al.  Heavy Metal Accumulation in a Sandy Soil and in Pepper Fruit Following Long-term Application Of Organic Amendments , 2005 .