Wastewater for agriculture: A reuse-oriented planning model and its application in peri-urban China.

The benefits of Integrated Water Resources Management (IWRM) are widely known but its recommendations remain thinly implemented. Designing wastewater treatment plants for reuse in irrigation is a particularly underutilized IWRM opportunity that could potentially increase agricultural yields, conserve surface water, offset chemical fertilizer demand, and reduce the costs of wastewater treatment by eliminating nutrient removal processes. This paper presents a novel planning model, consisting of a reuse-centric performance assessment and optimization model to help design wastewater treatment plants for reuse in agriculture. The performance assessment and optimization model are described, and their coupled application is demonstrated in the peri-urban district of Pixian, China. Based on the results of the performance assessment, two reuse scenarios are evaluated: wastewater to supplement business as usual (BAU) irrigation, and wastewater to replace BAU irrigation. The results indicate that wastewater supplementation could increase profits by $20 million (M) annually; alternatively, wastewater replacement could conserve 35Mm(3) of water in local rivers each year.

[1]  F. A. El-Awar,et al.  ECONOMIC-ENVIRONMENTAL APPROACH FOR OPTIMUM WASTEWATER UTILIZATION IN IRRIGATION: A CASE STUDY IN LEBANON , 1999 .

[2]  F. Ward.  Decision support for water policy: a review of economic concepts and tools , 2007 .

[3]  A. Bradford,et al.  Wastewater irrigation: Hubli- Dharwad, India , 2003 .

[4]  D. Zilberman,et al.  A Spatial Model of Optimal Water Conveyance , 1995 .

[5]  Olli Varis,et al.  China's 8 challenges to water resources management in the first quarter of the 21st Century , 2001 .

[6]  Shaozhong Kang,et al.  Simulation of winter wheat yield and water use efficiency in the Loess Plateau of China using WAVES , 2003 .

[7]  Juan Reca,et al.  Optimisation model for water allocation in deficit irrigation systems: I. Description of the model , 2001 .

[8]  Jikun Huang,et al.  Irrigation Water Pricing Policy in China , 2006 .

[9]  Luis S. Pereira,et al.  Model validation and crop coefficients for irrigation scheduling in the North China plain , 1998 .

[10]  Agri-Environmental Policies.  Environment, water resources and agricultural policies : lessons from China and OECD countries , 2006 .

[11]  E. W. Coward,et al.  Irrigation and agricultural development in Asia: perspectives from the social sciences. , 1980 .

[12]  Takashi Asano,et al.  Guidelines for the safe use of wastewater, excreta and greywater , 2006 .

[13]  U. Sahin,et al.  Effects of wastewater irrigation on soil and cabbage‐plant (brassica olerecea var. capitate cv. yalova‐1) chemical properties , 2007 .

[14]  M. Mohammad,et al.  Forage Yield and Nutrient Uptake as Influenced by Secondary Treated Wastewater , 2004 .

[15]  Franklin M. Fisher,et al.  Analyzing agricultural demand for water with an optimizing model , 1999 .

[16]  Olli Varis,et al.  Integrated water resources management: evolution, prospects and future challenges , 2005 .

[17]  Junying Chu,et al.  Wastewater reuse potential analysis: implications for China's water resources management. , 2004, Water research.

[18]  Subhash Chander,et al.  Optimal multicrop allocation of seasonal and intraseasonal irrigation water , 1990 .

[19]  J. E. Richards,et al.  Comparison of three statistical models describing potato yield response to nitrogen fertilizer. , 2000 .

[20]  J. V. van Lier,et al.  Use of wastewater in agriculture: the water chain approach , 2005 .

[21]  R. Cohen.  Handbook of Water Use and Conservation , 2002 .

[22]  R. Carr,et al.  Managing wastewater agriculture to improve livelihoods and environmental quality in poor countries , 2005 .

[23]  R. Chambers.  Basic concepts in the organization of irrigation , 1980 .

[24]  N Hall.  Linear and quadratic models of the southern Murray-Darling basin. , 2001, Environment international.

[25]  Isha Ray,et al.  Evaluation of Price Policy in the Presence of Water Theft , 1999 .

[26]  Jikun Huang,et al.  Irrigation, Poverty and Inequality in Rural China , 2005 .

[27]  John M. Blatt,et al.  Description of the Model , 1988 .

[28]  Kurth Perttu,et al.  Economics of using municipal wastewater irrigation of willow coppice crops , 1997 .

[29]  C. Buckley,et al.  Designing reuse-oriented sanitation infrastructure: the design for service planning approach , 2010 .

[30]  P Jeffrey,et al.  Role of water reuse for enhancing integrated water management in Europe and Mediterranean countries. , 2001, Water science and technology : a journal of the International Association on Water Pollution Research.

[31]  S. Masi,et al.  Agricultural wastewater reuse in southern Italy , 2006 .

[32]  Luis S. Pereira,et al.  Water Saving in the Yellow River Basin, China. 1. Irrigation Demand Scheduling , 2003 .