CN106583443A

CN106583443A - Method capable of synchronously treating biogas residues and pesticide polluted soil

Info

Publication number: CN106583443A
Application number: CN201611237082.7A
Authority: CN
Inventors: 张大磊; 罗文涛
Original assignee: Qingdao University of Technology
Current assignee: Qingdao University of Technology
Priority date: 2016-12-28
Filing date: 2016-12-28
Publication date: 2017-04-26

Abstract

The invention provides a method capable of synchronously treating biogas residues and pesticide polluted soil. The thought of the method is to mix and add the pesticide polluted soil, the biogas residues and one part of additives into a storage yard; and the stability of a pesticide degrading agent-the biogas residues is urged through a certain engineering measures.

Description

A kind of method that can synchronously dispose biogas residue and pesticide contaminated soil

Technical field

A kind of method that the present invention provides synchronization process pesticide contaminated soil and agricultural wastes biogas residue, its thinking is by agriculture The mixing of chemicals contamination soil, biogas residue and portions additive is added in stockyard, promotes the degraded of pesticide by certain engineering measure The stabilisation of agent biogas residue.This method is a kind of method of restoration of the ecosystem pesticide soil, belongs to field of environment protection.

Background technology

With the development and the expansion of urbanization process of industrial or agricultural, a large amount of soil are by giving up that pesticide or insecticide factory are discharged Water, solid waste pollution pollution.Pesticide contaminated soil processing method mainly has Thermal desorption method and advanced oxidation processes, Thermal desorption at present Method high cost, and easily generate atmospheric pollution.Advanced oxidation processes add substantial amounts of chemical agent, easy contaminated soil.At present Microbial method is increasingly paid close attention to, and Application No. CN201610442960.2 describes a kind of bioanalysises and repairs pollution by pesticides soil The method of earth.Although the method is ecological, reaction time is extremely long, and this is to be difficult to be dissolved in water due to pesticide, it is difficult to obtained by biology Take.The microbial inoculum and enzyme for adding simultaneously is expensive, relatively costly.

On the other hand, the development of agricultural modernization generates substantial amounts of agricultural wastes, for such agricultural wastes most Good method is exactly to carry out biogas fermentation methane phase, but this technique can produce a large amount of garbage biogas residues, and biogas residue is processed at present It is a great problem.

The content of the invention

For the deficiencies in the prior art, the present invention adopts a kind of synchronization process pesticide contaminated soil and agricultural wastes biogas residue Method.The method by adding straw toward biogas residue, makes biogas residue hydrolysis acidification bacterium increased activity, is prepared into biogas residue bacterium first Agent, provides basis for subsequent decomposing pesticide.Subsequently microbial inoculum, mineralized waste, contaminated soil mixing are positioned in stockyard, subsequently not It is disconnected to collect recharge stockyard after the nutritional solutions such as stockyard percolate, addition ethanol, promote pesticide effectively to degrade, while organic matter is stable Change, finally promote biogas residue and contaminated soil synchronously to dispose, soil can be used as ecological nutrition soil after going out.This technique is included Following steps：

(1) straw is crushed, is mixed with biogas residue, mixed proportion is straw：Biogas residue mass ratio（1-100）：10, while addition accounts for natural pond The KNO of slag amount 0.1-5%₃, maintain mixing water content of matter in 60-200%, react 1-20 days, be configured to biogas residue microbial inoculum；

(2) by mineralized waste, biogas residue microbial inoculum and pesticide contaminated soil with（0-20）：（1-20）：20 mixing, are placed in stockyard, heap Field surrounding laying antiseepage film, bottom is provided with leachate collection system；

(3) by leachate collection, add a certain amount of ethanol so that percolate ethanol content in 0-50%, then from the top of mixture Recharge;

(4) repeat step (3), until soil remediation terminates.

Conventional process pesticide soil method is compared, this method has following advantage：

1. compare traditional life cannot, this law process cycle is short, can finish soil remediation within most short 2 days；

2. pesticide is repaired more thoroughly, and this is as ethanol is by pesticide preferable dissolution so that microorganism is more prone to obtain, together When biogas residue in microorganism in the case of having ethanol as carbon source decomposing pesticide it is extremely strong, especially enhancing its hydrolysis acidification bacterium On the basis of；

3. the soil after processing has preferably ecological, and biogas residue can be easily dropped as nutrient substance, ethanol after being added to soil Solution, therefore do not result in secondary pollution；

4. synchronism stability biogas residue, while the stabilisation in semi-enclosed stockyard, it is to avoid secondary pollution.

Description of the drawings

Fig. 1 is landfill yard building mode schematic diagram.

It is embodied as example as follows：

Embodiment 1：

(1) straw is crushed, is mixed with biogas residue, mixed proportion is straw：Biogas residue mass ratio 11：10, while addition accounts for biogas residue matter The KNO of amount 0.1%₃, maintain mixing water content of matter 60%, react 3 days, be configured to biogas residue microbial inoculum；

(2) by mineralized waste, biogas residue microbial inoculum and pesticide contaminated soil with 9：10：20 mixing, are placed in stockyard, stockyard surrounding paving If antiseepage film, bottom are provided with leachate collection system；

(3) by leachate collection, add a certain amount of ethanol so that percolate ethanol content in 0-10%, then from the top of mixture Recharge;

(4) repeat step (3), after running 100 days, COD in the percolate of stockyard<50mg/kg, Pesticide-Polluted Soil is from 1000mg/ Kg degrades to less than 0.01mg/kg.

Embodiment 2：

(1) straw is crushed, is mixed with biogas residue, mixed proportion is straw：Biogas residue mass ratio 1：10, while addition accounts for biogas residue quality 5% KNO₃, maintain mixing water content of matter 60%, react 15 days, be configured to biogas residue microbial inoculum；

(2) by mineralized waste, biogas residue microbial inoculum and pesticide contaminated soil with 1：5：20 mixing, are placed in stockyard, the laying of stockyard surrounding Antiseepage film, bottom are provided with leachate collection system；

(3) by leachate collection, add a certain amount of ethanol so that percolate ethanol content in 0-20%, then from the top of mixture Recharge;

(4) repeat step (3), after running 150 days, COD in the percolate of stockyard<50mg/kg, Pesticide-Polluted Soil is from 1000mg/ Kg degrades to less than 0.01mg/kg.

Above example is only illustrating technical scheme, rather than is limited；Although with reference to aforementioned reality Apply example to be described in detail the present invention, for the person of ordinary skill of the art, still can be to aforementioned enforcement Technical scheme described in example is modified, or carries out equivalent to which part technical characteristic；And these are changed or replace Change, do not make the essence of appropriate technical solution depart from the spirit and scope of claimed technical solution of the invention.

Claims

1. a kind of method that can synchronously dispose biogas residue and pesticide contaminated soil, is characterized in that, comprise the steps of：

(4) repeat step (3), until soil remediation terminates.

2. a kind of method that can synchronously dispose biogas residue and pesticide contaminated soil as claimed in claim 1, is characterized in that, step （2）Middle added biogas residue microbial inoculum directly can be replaced with biogas residue.

3. a kind of method that can synchronously dispose biogas residue and pesticide contaminated soil as claimed in claim 1, is characterized in that, step （2）Middle stockyard paving mode is as follows：Impervious barrier is laid in stockyard bottom, lays punched collection pipe thereon, for leachate collection, on Gravel is laid in face, for water conservancy diversion percolate, inserts multiple leachate recirculation conduits on stockyard surface, on the one hand fills for excluding Gas, on the other hand can be with recharge percolate.

4. a kind of method that can synchronously dispose biogas residue and pesticide contaminated soil as claimed in claim 1, is characterized in that, step （2）Middle ethanol can be substituted with methanol, oils and fatss etc., and its effect is both can to provide high-quality carbon source for microorganism, it is also possible to by soil Earth Pesticides are effectively extracted from soil, are obtained by microorganism.