| 摘要 | 第3-4页 |
| ABSTRACT | 第4-5页 |
| Chapter1:Introduction | 第8-36页 |
| 1.1 Definitions and Concepts | 第9-26页 |
| 1.1.1 Wastewater Treatment | 第10-16页 |
| 1.1.2 Sewage Sludge Treatment | 第16-18页 |
| 1.1.3 Leaching processes | 第18-26页 |
| 1.2 Research status of improvement of coastal saline soil in China and abroad | 第26-33页 |
| 1.2.1 Causes and harms of coastal saline-alkali soil | 第26-27页 |
| 1.2.2 Distribution of saline-alkali soil in coastal China | 第27页 |
| 1.2.3 Improvement measures of coastal saline soil | 第27-31页 |
| 1.2.4 Characteristics of spatial variability of soil salinity | 第31-33页 |
| 1.3 Research content | 第33-34页 |
| 1.4 Thesis Ideas and Content | 第34-36页 |
| Chapter2:Experimental apparatus and method | 第36-44页 |
| 2.1 Collection and preparation of experimental soil samples | 第36-38页 |
| 2.1.1 Collection and basic properties of experimental soil samples | 第36-37页 |
| 2.1.2 Extraction of colloidal from saline soil | 第37-38页 |
| 2.2 Experimental steps | 第38-39页 |
| 2.3 Experimental chemical reagents and Equipment | 第39-41页 |
| 2.3.1 Chemical reagents | 第39页 |
| 2.3.2 Equipment | 第39-41页 |
| 2.4 Experimental conditions | 第41-42页 |
| 2.4.1 Incubation period | 第41页 |
| 2.4.2 Leaching | 第41-42页 |
| 2.5 Test Projects and methods | 第42页 |
| 2.6 Summary of this chapter | 第42-44页 |
| Chapter 3: Mechanism of improving coastal saline-alkali soil in Binhai area | 第44-56页 |
| 3.1 Mechanism research and experiment | 第44-46页 |
| 3.2 Determination of items methods and experimental results | 第46-53页 |
| 3.2.1 Analysis of Total Nitrogen | 第46-51页 |
| 3.2.2 Analysis of Total Phosphorus | 第51-53页 |
| 3.3 Summary of this chapter | 第53-56页 |
| Chapter4:Risk assessment of heavy metals in modified saline-alkali soil with sludge | 第56-64页 |
| 4.1 Studies background | 第56页 |
| 4.2 Physical and chemical properties during the reclamation processes in soil | 第56-57页 |
| 4.2.1 Plot layout and management | 第57页 |
| 4.3 Treatment and analysis of heavy metals in sludge and soil | 第57-60页 |
| 4.4 Experimental results of Cr,Cd and Pb in saline-alkali soil | 第60-63页 |
| 4.5 Summary of this chapter | 第63-64页 |
| Chapter5:Conclusion and prospect | 第64-66页 |
| 5.1 Research conclusion | 第64页 |
| 5.2 Problems and solving suggestion | 第64-66页 |
| References | 第66-74页 |
| Statement on paper publication and scientific research participation | 第74-76页 |
| Acknowledgements | 第76页 |
