CN105945051A

CN105945051A - Landfill method for stabilization of Hg-containing soil based on biogas residues

Info

Publication number: CN105945051A
Application number: CN201610370365.2A
Authority: CN
Inventors: 张大磊; 孙箫; 赵昱皓; 路亮
Original assignee: Qingdao University of Technology
Current assignee: Qingdao University of Technology
Priority date: 2016-05-30
Filing date: 2016-05-30
Publication date: 2016-09-21

Abstract

The invention discloses a landfill method for stabilization of Hg-containing soil based on biogas residues. The invention provides a method for and stabilizing household garbage while repairing Hg-containing soil by using a landfill technology. The method performs landfill of the Hg-containing soil, the household garbage, mineralized garbage and a certain materials together; and through a certain landfill mode and simple operation means, organic matter in the household garbage can be quickly stabilized while the Hg-containing soil is repaired; and landfill leachate is treated at low cost.

Description

A kind of stabilisation based on biogas residue burying method containing Hg soil

Technical field

The present invention relates to a kind of stabilisation based on biogas residue burying method containing Hg soil, Hg soil will be contained and fill with domestic garbage mixing, and control certain condition, it is achieved the stabilisation of the two, belong to field of environment engineering technology.

Background technology

China's Pb in Soil and cadmium pollution event are multiple in recent years, and therefore the reparation of lead-contaminated soil is faced with stern challenge.

Improvement to lead, cadmium pollution soil at present is broadly divided into both direction: one is by modes such as chemical leaching, bioleaching or plant extractions, in making lead, lead be transferred to leachate or plant from soil thus reduce Content of Pb in Soil, but owing to Hg is insoluble in water, so this method is difficult to promote；Two is to be acted on by fixing/stabilising etc., make lead in soil by with soil desorbing, character or morphologic change so that its toxicity reduces.In the second repair mode, chemistry is fixing also known as chemical passivation, can quickly effectively pollution remission, the migration of blocking-up lead, it has also become the study hotspot that currently lead-contaminated soil is repaired.But this method needs firming agent, relatively costly.The patent No. 201510056406.6 describes a kind of curing containing Hg soil, but the method using substantial amounts of material, relatively costly, on the other hand solidification effect is unstable, the most easily there is carbonation in the calcium oxide as added so that alkaline-curing effect reduces.

Summary of the invention

For the deficiencies in the prior art, the present invention provides a kind of and utilizes the Landfill reparation method containing Hg soil Simultaneous Stabilization house refuse.This method will fill jointly containing Hg soil, house refuse and mineralized waste and certain material, by certain land-fill method and shirtsleeve operation means, while Hg soil remediation will be contained, again can be by rapid stabilization organic in house refuse, and the process percolate of low cost.

As shown in drawings, concrete operation step is as follows for this landfill yard building mode:

1. lay impervious barrier bottom, it lays punched collection pipe, for leachate collection, lay gravel above, for water conservancy diversion percolate, above gravel, lay mineralized waste layer, highly 30-300cm, it lays the elementary layer of 1-10；Insert multiple leachate recirculation conduits on the elementary layer surface of the superiors, be on the one hand used for getting rid of landfill gas, on the other hand can recharge percolate；

2. the paving mode of elementary layer is as follows: the mixed layer that bottom is made up of organic waste, biogas residue and Gypsum Fibrosum forms, and mixed proportion is Gypsum Fibrosum: biogas residue: organic waste=(1-10): (1-10): (1-40), lays height 10-100cm；Lay the soil horizon Han Hg above mixed layer, lay height 10-200cm；Lay mineralized waste layer containing Hg soil horizon top, lay height 10-100cm；Another one layer is re-layed above elementary layer, the like, gradually lay；

3. After collected percolate imports leachate collection pond, directly get at leachate recirculation conduit mouth with pump, until each pollutant levels COD < 50mg/L, Hg < 0.05 mg/L in percolate.

Present method be advantageous in that:

1. this method utilizes two kinds of principle of solidification solidification Hg, and first with the fixing Hg of alkalescence effect of Gypsum Fibrosum, in Gypsum Fibrosum, sulfate anaerobism is converted into sulfide and precipitates Hg subsequently；

2. comparing other and process technique, this technique achieves the stabilisation of organic waste while containing Hg soil-burial stabilisation.

Accompanying drawing explanation

Fig. 1 is that landfill lays schematic diagram

It is embodied as example as follows:

Example 1:

1. lay impervious barrier bottom, it lays punched collection pipe, for leachate collection, lay gravel above, for water conservancy diversion percolate, above gravel, lay mineralized waste layer, highly 200cm, it lays the elementary layer of 4；Insert multiple leachate recirculation conduits on the elementary layer surface of the superiors, be on the one hand used for getting rid of landfill gas, on the other hand can recharge percolate；

2. the paving mode of elementary layer is as follows: the mixed layer that bottom is made up of organic waste, biogas residue and Gypsum Fibrosum forms, and mixed proportion is Gypsum Fibrosum: biogas residue: organic waste=2:5:15, lays height 100cm；Lay the soil horizon Han Hg above mixed layer, lay height 200cm；Lay mineralized waste layer containing Hg soil horizon top, lay height 100cm；Another one layer is re-layed above elementary layer, the like, gradually lay；

3. After collected percolate imports leachate collection pond, directly get at leachate recirculation conduit mouth with pump, until each pollutant levels COD < 50mg/L, Hg < 0.05 mg/L in percolate；

4. constantly being recharged to conduit by collected percolate, through about two weeks left and right time, Hg < 0.05 mg/L, in the stable percolate of about 1 year, < 50mg/L stops recharging each pollutant levels COD.

Example 2:

1. lay impervious barrier bottom, it lays punched collection pipe, for leachate collection, lay gravel above, for water conservancy diversion percolate, above gravel, lay mineralized waste layer, highly 150cm, it lays the elementary layer of 7；Insert multiple leachate recirculation conduits on the elementary layer surface of the superiors, be on the one hand used for getting rid of landfill gas, on the other hand can recharge percolate；

2. the paving mode of elementary layer is as follows: the mixed layer that bottom is made up of organic waste, biogas residue and Gypsum Fibrosum forms, and mixed proportion is Gypsum Fibrosum: biogas residue: organic waste=3:8:30, lays height 100cm；Lay the soil horizon Han Hg above mixed layer, lay height 200cm；Lay mineralized waste layer containing Hg soil horizon top, lay height 100cm；Another one layer is re-layed above elementary layer, the like, gradually lay；

4. collected percolate is constantly recharged to conduit, through about two weeks left and right time, Hg < 0.05 Mg/L, in the stable percolate of about 1 year, < 50mg/L stops recharging each pollutant levels COD.

Claims

1. a stabilisation based on the biogas residue burying method containing Hg soil, its building mode is: impervious barrier is laid in bottom, punched collection pipe is laid on it, for leachate collection, lay gravel above, for water conservancy diversion percolate, above gravel, lay mineralized waste layer, highly 30-300cm, it lays several elementary layer；Insert multiple leachate recirculation conduits on the elementary layer surface of the superiors, be on the one hand used for getting rid of landfill gas, on the other hand can recharge percolate.

A kind of stabilisation based on biogas residue burying method containing Hg soil, the paving mode of elementary layer is as follows: the mixed layer that bottom is made up of organic waste, biogas residue and Gypsum Fibrosum forms, mixed proportion is Gypsum Fibrosum: biogas residue: organic waste=(1-10): (1-10): (1-40), lays height 10-100cm；Lay the soil horizon Han Hg above mixed layer, lay height 10-200cm；Lay mineralized waste layer containing Hg soil horizon top, lay height 10-100cm；Another one layer is re-layed above elementary layer, the like, gradually lay.

A kind of stabilisation based on biogas residue burying method containing Hg soil, gravel layer contains certain slope, lays punched collection pipe at the bottom of slope；Punched collection tube wall has aperture, aperture 1-3cm, each hole separation 20-50cm, and collecting pipe caliber 10-30cm, for leachate collection.

A kind of stabilisation based on biogas residue burying method containing Hg soil, leachate recirculation conduit caliber 10-30cm, manages deep 1-2m, every 5-10m and lays a conduit.

A kind of stabilisation based on biogas residue burying method containing Hg soil, after collected percolate imports leachate collection pond, direct pump is got at leachate recirculation conduit mouth, until each pollutant levels COD < 50mg/L, Hg < 0.05 mg/L in percolate.

6. elementary layer paving mode as claimed in claim 2, organic waste therein includes domestic waste and food garbage.

7. elementary layer paving mode as claimed in claim 2, described biogas residue is that agricultural, grocery trade debirs carry out the solid residue in dry type, half dry type and wet type anaerobic fermentation process.