Method for co-processing household garbage and leaching fly ash through membrane concentrated solution, obtained residues and application
A domestic garbage and co-processing technology, which is applied in the field of waste treatment and resource utilization, can solve the problems of incineration fly ash and membrane concentrates in the safe and harmless utilization of the environment, and achieve high resource utilization of fly ash and reduce waste. Quantify obvious, easy-to-operate effects
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[0076] The present embodiment provides a method for leaching fly ash from domestic waste co-processing membrane concentrate, comprising the following steps:
[0077] (1) by aforementioned leaching unit, carry out leaching treatment to incineration fly ash with membrane concentrate; Concretely, the filling height of incineration fly ash is 12cm, and the filling height of each quartz sand layer is respectively 2~3cm, leaching speed Control at 40mL / h; take the start of effluent from the fly ash column as the timing point, monitor the conductivity of the leaching liquid, when the conductivity of the leaching liquid is stable, the leaching end point is reached, and the leaching treatment is completed;
[0078] (2) Take out the leaching ash residue after the leaching treatment in step (1), spread it on a tray and place it in an oven, dry it at a temperature of 105 ° C for 24 hours, naturally cool it, grind it, and pass it through a 100-mesh sieve, then press A certain proportion is ...
experiment example 1
[0101] Under the conditions of the membrane concentration and leaching of fly ash in the embodiment of the present invention, the thickness of the fixed fly ash layer is 12 cm, and the leaching speed is 40 mL / h, the total elution efficiency of chloride in the fly ash can be realized to be 94.5%, and the corresponding Pb The overall elution efficiency was 41.8%; the leaching toxicity was reduced by 90.1%.
[0102] In order to compare the effects of different treatment conditions on the leaching concentration and leaching toxicity of heavy metals in the treated residues, the method of "Solid Waste Leaching Toxicity Leaching Method-Sulfuric and Nitric Acid Method (HJ / T299-2007)" was used to analyze the leaching toxicity of solid samples. The method of "Hazardous Waste Identification Standard-Leaching Toxicity Identification (GB5085.3-2007)" method was used to analyze the leaching toxicity of solid samples. The test results are shown in Table 5 and Table 6, respectively.
[0103] ...
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