ABSTRACT

The treatment and utilization of large-scale river and lake dredging sediment is one of the engineering difficulties in river and lake engineering construction It is an effective way to solve this problem to use silted soil of rivers and lakes as planting soil for greening gardens and high standard farmland. The polluted sediments of plateau lakes have the characteristics of eutrophication and high resource value. However, the fluvial sediments are heavily polluted resulting in very low resource conversion rate. Taking the dredged sediment of a plateau lake in northern China as an example, this sludge cannot be used as normal soil due to its complex composition and serious pollution. It is planned to modify the lake sediments to change their structure and improve their physical and chemical properties by reducing salt content and specific gravity, improving texture, increasing porosity, and increasing the content of organic matter and nitrogen, phosphorus and potassium nutrients and other tests. It can effectively improve the function of sludge and thus produce soil biological succession. The purpose of this study is to improve and compound the dredged sediment of plateau lakes, obtain the best method to improve the green planting soil, and propose the technology of solidified sludge as green grass planting soil, providing theoretical basis and technical support for the green comprehensive utilization of large quantities of dredged sediment in plateau lakes.

INTRODUCTION

The plateau lake in Inner Mongolia and its drainage basin, located in Ulanqab City, Inner Mongolia Autonomous Region, is one of the three inland lakes in Inner Mongolia Autonomous Region, which is the core area of ecological and environmental protection in central Inner Mongolia Autonomous Region, the important component of the Green Great Wall in northern Xinjiang and the important node of "northern sand Prevention Belt" in the national ecological security pattern. It plays an important role in ensuring ecological environment security in the Beijing-Tianjin-Hebei region. Historically, a plateau lake in Inner Mongolia used to be named the "pearl outside the wall" with abundant water and grasses, playing an important role in the plateau ecosystem.

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