| CPC B09C 1/02 (2013.01) [B09C 1/08 (2013.01); B09C 1/10 (2013.01)] | 4 Claims |
|
1. A method for treatment of an emergency disposal system suitable for contaminated soil,
wherein then emergency disposal system suitable for contaminated soil comprises a pretreatment unit, a feed weighing unit, a giant-grain soil remediation unit, a fine-grain soil removal unit and a coarse-grain soil enhanced remediation unit sequentially provided according to a soil treatment process;
wherein the fine-grain soil removal unit and the coarse-grain soil enhanced remediation unit are respectively further connected to a fine-grain soil deep remediation unit for treatment;
waste liquid generated by the fine-grain soil deep remediation unit further enters a waste liquid treatment unit;
the coarse-grain soil enhanced remediation unit, the fine-grain soil deep remediation unit and the waste liquid treatment unit are respectively connected to a dispensing unit, and the pretreatment unit is provided with a mixing device and a sieving device according to a working procedure;
the feed weighing unit is provided with a feeding device and a weighing device according to the working procedure;
the giant-grain soil remediation unit is provided with a grinding and washing device and a sieving device according to the working procedure;
the fine-grain soil deep remediation unit is provided with a dewatering device and an agent mixing device according to the working procedure; the coarse-grain soil enhanced remediation unit is provided with a multi-stage washing device and a multi-stage sieving device according to the working procedure, the waste liquid treatment unit is provided with a waste liquid reaction device, a settling device, a filtering device and an adsorption device according to the working procedure, and the dispensing unit comprises a microbial agent, a chemical oxidizing agent, a surfactant, a curing and stabilizing agent, a heavy metal capturing agent, an acid, an alkali, a flocculant and a coagulant aid;
the pretreatment unit, the feed weighing unit, the giant-grain soil remediation unit, the fine-grain soil removal unit, the coarse-grain soil enhanced remediation unit, the fine-grain soil deep remediation unit and the waste liquid treatment unit are capable of performing treatment separately;
the system is capable of selecting different treatment units and a combination thereof according to different soil contaminants being treated;
the coarse-grain soil enhanced remediation unit comprises a multi-stage enhanced washing device and a sieving and separating device; the enhanced washing device and the sieving and separating device are capable of setting multiple particle-size levels according to characteristics of the coarse-grain soil; the coarse-grain soil is divided into three particle-size levels, respectively: 60 mm to 6 mm, 6 mm to 1 mm, and 1 mm to 0.075 mm, which are sequentially subjected to enhanced washing as well as sieving and separating; and
the giant grain is soil with a particle size greater than 60 mm;
wherein the method comprises:
S1. homo-mixing the contaminated soil and sieving to remove large debris by the pretreatment unit;
S2. enabling soil to enter the feed weighing unit, precisely quantifying the contaminated soil, and conveying the contaminated soil into the giant-grain soil remediation unit, the giant grain being soil with a particle size greater than 60 mm;
S3. adding circulating water in the giant-grain soil remediation unit to rub and wash the giant-grain soil to effectively remove a small amount of contaminants on the giant-grain soil surface, separating the giant-grain soil that is remediated to be qualified, remediating the total amount of organic matter and heavy metals in the separated giant-grain soil up to the standard, and enabling the slurry to enter the fine-grain soil removal unit;
S4. separating firstly the fine-grain soil enriched with contaminants to a higher degree from the coarse-grain soil with relatively fewer contaminants in advance by the fine-grain soil removal unit, enabling the separated coarse-grain soil to enter the coarse-grain soil enhanced remediation unit, enabling the separated fine-grain soil to enter the fine-grain soil deep remediation unit, and respectively washing the fine-grain soil and the coarse-grain soil independently;
S5. enabling the coarse-grain soil enhanced remediation unit to be provided with a plurality of enhanced washing devices, targetedly adding a remediation agent and circulating water by the dispensing unit to wash the coarse-grain soil in an enhanced manner to effectively remove contaminants on the coarse-grain soil surface, removing the total amount of organic matter and heavy metals in the separated coarse-grain soil, and enabling the separated slurry to enter the fine-grain soil deep remediation unit;
S6. for the slurry that enters the fine-grain soil deep remediation unit after treatment in the S5, separating fine-grain soil sediment from the waste liquid using the principle of filtration and separation, then separating the fine-grain soil sediment with low water content, targetedly adding, according to the type of contaminants, a corresponding remediation agent by the dispensing unit for deep treatment, wherein the chemical remediation agent or microbial remediation agent is added for organic contaminants, the stabilizing remediation agent is added for heavy metal contaminants, the remediated fine-grain soil is up to the standard and subjected to resource utilization, and the separated waste liquid enters the waste liquid treatment unit; and
S7. in the waste liquid treatment unit after the S6 step, according to the type of contaminants in the waste liquid, targetedly adding a chemical oxidizing agent, a heavy metal capturing agent, a flocculant and a coagulant aid by the dispensing unit for agent reaction, removing contaminants from the waste liquid, and recycling the waste liquid after satisfying the requirements for reuse water quality through settling, filtration and adsorption processes after completing the sufficient reaction,
wherein the enhanced washing device in the S4 is an agitator, an ultrasonic wave, a froth flotation and a magnetic separation.
|