Abstract:To overcome the shortcomings of high salinity and nutrients deficiency for flue gas desulfurization gypsum (FGD-gypsum) in improving saline-alkali soil, the mixture of flue gas desulfurization gypsum (FGD-gypsum) and green wastes compost (GWC) with different mass ratios was used to conduct the experiments of saline alkali soil recovery in Nanhui District, Shanghai. The results showed that their mixed-use could significantly reduce the pH and total salt content of saline soil, raise the nutrients content, the biomass of plants and plant absorbing ability for nutrients. Compared with the control group, when the dosage of FGD-gypsum was 25 g·kg?1, pH decreased by 10.9%, EC increased by 8.4%, available phosphorus, hydrolytic nitrogen and potassium contents decreased by 8.4%, 30.1%, 40.5% and 36.1%, respectively, the ryegrass germination decreased by 8.0%, the contents of total nitrogen and potassium increased, and total phosphorus in plant decreased by 25.4%. When different mass ratios of GWC was mixed with FGD-gypsum for soil recovery, soil pH and EC value decreased by 6.8%~13.8% and by 4.2%~11.6%, respectively, while the contents of soil available phosphorus, hydrolytic nitrogen and potassium contents increased by 96.0%~182.7%, 40.0%~186.7% and 71.7%~157.5%, respectively. The germination rate and biomass of ryegrass increased gradually. At GWC mass ratio of 40%, compared with the control group, the germination rate reached 90.0%, the total wet weight, above ground dry weight, plant height and root length increased by 154.1%, 100.0%, 89.2% and 103.6%, respectively. The contents of nitrogen and potassium in plant increased by 139.9% and 40.8%, respectively, and phosphorus content was close to that in the control group. These results indicated that the mixed-use of FGD-gypsum and GWC had a good performance on the saline alkali soil recovery, and provided a reference for the feasible disposal and comprehensive approaches of municipal solid waste. Key words:flue gas desulfurization gypsum (FGD-gypsum)/ green wastes compost (GWC)/ mixed application/ saline soil/ soil improvement/ nutrients.
图1不同改良处理中土壤pH的变化 Figure1.Changes of soil pH under different soil amendments
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1.School of Ecological Technology and Engineering, Shanghai Institute of Technology, Shanghai 201418, China 2.Shanghai Academy of Environmental Sciences, Shanghai 200233, China Received Date: 2019-04-26 Accepted Date: 2019-10-14 Available Online: 2020-03-02 Keywords:flue gas desulfurization gypsum (FGD-gypsum)/ green wastes compost (GWC)/ mixed application/ saline soil/ soil improvement/ nutrients Abstract:To overcome the shortcomings of high salinity and nutrients deficiency for flue gas desulfurization gypsum (FGD-gypsum) in improving saline-alkali soil, the mixture of flue gas desulfurization gypsum (FGD-gypsum) and green wastes compost (GWC) with different mass ratios was used to conduct the experiments of saline alkali soil recovery in Nanhui District, Shanghai. The results showed that their mixed-use could significantly reduce the pH and total salt content of saline soil, raise the nutrients content, the biomass of plants and plant absorbing ability for nutrients. Compared with the control group, when the dosage of FGD-gypsum was 25 g·kg?1, pH decreased by 10.9%, EC increased by 8.4%, available phosphorus, hydrolytic nitrogen and potassium contents decreased by 8.4%, 30.1%, 40.5% and 36.1%, respectively, the ryegrass germination decreased by 8.0%, the contents of total nitrogen and potassium increased, and total phosphorus in plant decreased by 25.4%. When different mass ratios of GWC was mixed with FGD-gypsum for soil recovery, soil pH and EC value decreased by 6.8%~13.8% and by 4.2%~11.6%, respectively, while the contents of soil available phosphorus, hydrolytic nitrogen and potassium contents increased by 96.0%~182.7%, 40.0%~186.7% and 71.7%~157.5%, respectively. The germination rate and biomass of ryegrass increased gradually. At GWC mass ratio of 40%, compared with the control group, the germination rate reached 90.0%, the total wet weight, above ground dry weight, plant height and root length increased by 154.1%, 100.0%, 89.2% and 103.6%, respectively. The contents of nitrogen and potassium in plant increased by 139.9% and 40.8%, respectively, and phosphorus content was close to that in the control group. These results indicated that the mixed-use of FGD-gypsum and GWC had a good performance on the saline alkali soil recovery, and provided a reference for the feasible disposal and comprehensive approaches of municipal solid waste.
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