Journal of Marine Sciences ›› 2012, Vol. 30 ›› Issue (3): 12-18.

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Preliminary study on amelioration of coastal saline alkali soil with citric acid industrial wastewater

GU Ying-ying1, YU Xiang-quan2, WANG Ze3, ZHAO Dong-feng1, ZHANG Xiu-xia1   

  1. 1. Department of Environmental and Safety Engineering, China University of Petroleum (East China), Qingdao 266580, China;
    2. College of Environmental Sciences and Engineering, Peking University, Beijing 100871;
    3. Department of Environmental Engineering, Petroleum University of China (Beijing), Beijing 102249
  • Received:2012-07-12 Revised:2012-08-10 Online:2012-09-15 Published:2022-11-30

Abstract: Coastal soil salinization has become one of the most important land problems all over the world. It is very urgent now to ameliorate and take use of the saline-alkali soils effectively. In this paper,citric acid industrial wastewater after pretreatment was used to ameliorate a saline-alkali soil collected from a coastal oil factory in Dongying City,China. The effects and feasibility of saline-alkali soil amelioration with citric acid industrial wastewater were preliminary analyzed based on the variation of physicochemical properties of the soil before and after irrigation process. Results of the experiments showed that pH and electrical conductivity of soil solution decreased after citric acid industrial wastewater irrigation; saturated water ratio of the soil increased compared to tap water irrigation; organic matter content and the total nitrogen content increased significantly. All the changes indicated that the physicochemical properties and nutrition conditions of the saline-alkali soil were improved after the citric acid industrial wastewater irrigation. It can be concluded that citric acid industrial wastewater may be used as an effective enhancement agent of saline alkali soils, which achieves the goal of “waste treatment by waste”.

Key words: saline-alkaline soil, citric acid industrial wastewater, physicochemical properties, amelioration