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Method for resource utilization of desilting sediment

A resource utilization and bottom sludge technology, which is applied in the direction of pyrolysis treatment of sludge, restoration of polluted soil, solid fuel, etc., can solve problems such as not seen, and achieve the effect of enhanced adsorption performance

Inactive Publication Date: 2017-03-29
CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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  • Method for resource utilization of desilting sediment

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Embodiment 1

[0027] see figure 1 , the present embodiment provides a method for resourceful utilization of dredging bottom mud, first, drying the dredging bottom mud and mature aquatic plants respectively, and drying the dried dredging bottom mud and the aquatic plants The plants are respectively crushed to a particle size of less than 1 mm; then, the crushed dredged bottom mud and the aquatic plants are fully mixed in a mass ratio of 1:4 to obtain a mixture; then, the mixture is subjected to anaerobic conditions Biochar is obtained by pyrolysis at 450°C (the organic pollutants contained in the dredged bottom sludge do not exceed the standard) or 700°C (the organic pollutants contained in the dredged bottom sludge exceed the standard) for 1 hour; finally, the biochar is sequentially heated with 0.5 mol / L hydrochloric acid solution and water washing to obtain activated biochar, and the activated biochar is a soil remediation agent.

[0028] No soluble heavy metals or organic pollutants wer...

Embodiment 2

[0032] Two kinds of soil remediation agents obtained in Example 1—soil remediation agent (450° C.) and soil remediation agent (700° C.) were used for soil improvement, and the dosage was 5% of the dry weight of the soil to be remediated. The physical and chemical properties of the soil were measured one month later. The properties of the soil before and after improvement are shown in Table 1 below:

[0033] Table 1 The physical and chemical properties of the soil before and after the soil restoration agent improved soil obtained by the present invention

[0034]

[0035] Through the comparison of the above examples, it can be found that the dredged bottom sludge and mature aquatic plants are dried and pulverized respectively, fully mixed according to a certain ratio, and biochar is prepared by high-temperature pyrolysis under anoxic conditions; the prepared biochar is activated by acid Become activated biochar, i.e. the soil remediation agent of the present invention. The ...

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Abstract

The present invention discloses a method for resource utilization of desilting sediment. The method comprises: (1) respectively drying desilting sediment and mature aquatic plants; (2) respectively crushing the dried desilting sediment and the dried mature aquatic plants; (3) completely mixing the crushed desilting sediment and the crushed mature aquatic plants according to a mass ratio of 1:3-5 to obtain a mixture; (4) carrying out high temperature pyrolysis on the mixture under a hypoxia condition to obtain biological charcoal; and (5) carrying out acid activation on the biological charcoal to obtain the activated biological charcoal, wherein the activated biological charcoal is the soil remediation agent and is suitable for soil remediation and improvement.

Description

technical field [0001] The invention relates to a method for resource utilization of dredging bottom mud and its application, in particular to a method for preparing a soil repair agent by using dredging bottom mud. Background technique [0002] At present, with the rapid development of economy and society, water bodies such as rivers and lakes have been polluted and destroyed to varying degrees. Among them, bottom mud (also called silt) is mainly derived from sediment, terrestrial animal and plant residues, pollutants, and aquatic animal and plant residues carried by surface runoff, and is formed by precipitation under the joint action of various factors in the water environment. Sediment not only silts up river channels and reduces the ability of lakes to regulate and store floods, but also releases nutrients, heavy metals, and organic pollutants into water bodies, becoming endogenous pollution of water bodies and posing a serious threat to water ecological security. [0...

Claims

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Application Information

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IPC IPC(8): C02F11/10C10L5/46C10L5/44B09C1/00
CPCY02E50/10Y02E50/30C02F11/10B09C1/00C10L5/44C10L5/445C10L5/46
Inventor 许继军武海鹏陈进桑连海刘强代娟殷大聪叶玉适
Owner CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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