Energy-saving consumption-reducing technique for preparing haydite by co-disposing polluted soil and desilting sediment

Abstract

The invention relates to an energy-saving consumption-reducing environment-friendly method for preparing haydite by co-disposing municipal massive solid wastes, which comprises the following steps: directly mixing polluted soil and polluted desilting sediment (without energy-consuming drying), adding a conditioner, granulating, and firing at 900-1200 DEG C for 15-40 minutes. The test indicates that the prepared haydite product has the following properties: the bulk density is 500-900 kg / m<3>, the cylindrical compressive strength is 5.0-10.0 Mpa, and the water absorptivity is 4.8-9.2%; and the leaching toxicities of typical heavy metals are as follows: Cu<0.26 mg / L, As<0.03 mg / L, Cd<0.0002 mg / L, and Hg<0.0001 mg / L. The method provided by the invention fully utilizes the water-content complementarity of the polluted soil and sewage reservoir sediment as well as the characteristic of mutual catalytic degradation of heavy metal pollutants and organic pollutants, implements energy saving and consumption reduction in the technical field of traditional techniques for preparing haydite from solid wastes, lowers the cost and secondary pollution in solid waste disposal industry, enhances the properties of the solid waste haydite, and widens the application field of the solid waste haydite.

Description

technical field [0001] The invention relates to a method for co-processing urban bulk solid waste with energy saving and consumption reduction technical background [0002] Soil is the material basis for human survival and an indispensable and non-renewable natural resource for human beings. The soil environment is an important part of the human environment. With the improvement of agricultural production technology, the development of industrialization and the advancement of urbanization, a large amount of industrial waste has been discharged indiscriminately, and a large number of highly toxic and refractory pesticides have been developed and used. The residue and accumulation of toxic and harmful substances in the environment has become one of the most concerned environmental issues in the society. At present, the problem of soil pollution in our country is becoming more and more serious, and it is spreading across the country at a speed and trend that cannot be ignored...

AI Technical Summary

Problems solved by technology

[0009] Urban construction land polluted soil and rivers, reservoir dredging and polluted sediment are both pollutants and resources. In view of the current large amount of polluted soil and polluted sediment, low degree of resource utilization, and large energy consumption for separate treatment, the traditional Due to the shortage of cultivated land resources, the clay ceramsite is faced with the actual situation of raw material shortage and industrial chain rupture. The present invention provides a method for co-processing polluted soil and polluted sediment to save energy and reduce consumption. Among them, it not only solves the problem of shortage of raw materials for ceramsite production, but also greatly reduces the operating costs of ceramsite production enterprises by using solid waste to make ceramsite, and promotes the healthy development of the industry