CN110102165B

CN110102165B - Method for preparing deodorant from landfill leachate concentrated solution

Info

Publication number: CN110102165B
Application number: CN201910356463.4A
Authority: CN
Inventors: 申哲民; 沙亚东
Original assignee: Shanghai Jiaotong University
Current assignee: Jinduo Yuchen Jiaxing Environmental Protection Technology Co ltd
Priority date: 2019-04-29
Filing date: 2019-04-29
Publication date: 2022-01-04
Anticipated expiration: 2039-04-29
Also published as: CN110102165A

Abstract

The invention relates to a method for preparing deodorant from landfill leachate concentrated solution, which comprises the steps of firstly adding coagulant into the landfill leachate concentrated solution to remove macromolecular organic matters, then adding oxidant into the obtained solution to carry out advanced oxidation to remove micromolecular organic matters and odor, then adding acid to react to prepare the oxidant, and preparing the deodorant containing Cl₂And ClO₂A composite air deodorant of solution. Compared with the prior art, the invention not only can effectively treat the concentrated solution, but also can convert the concentrated solution into the oxidation deodorant which is effective to the odor.

Description

Method for preparing deodorant from landfill leachate concentrated solution

Technical Field

The invention belongs to the technical field of environmental protection and energy conservation, and relates to a method for preparing a deodorant from a landfill leachate concentrated solution.

Background

The concentration treatment of the landfill leachate mainly adopts a method combining a membrane technology and biochemical treatment, 15-30% of concentrated solution is generated by the liquid membrane treatment of the landfill leachate, and the concentrated solution contains about 5% of sodium chloride, macromolecular humic acid and strong odor. The high concentration of contaminants and the low biodegradability of the concentrate make it a potential source of pollution with a strong destructive power to the environment. The treatment mode of the garbage percolate concentrated solution mainly comprises three methods of recharging, burning or evaporating treatment. Recharge will probably cause groundwater pollution and will result in effluent COD, conductivity and NH⁴⁺、Cl^-Etc. The evaporation or incineration method has the problems of high requirement on energy sources (biogas or steam sources), high equipment investment and high maintenance cost, and high concentration humic acid and high hardness in the concentrated solution can cause evaporation coking and scaling.

Disclosure of Invention

The invention aims to provide a method for preparing a deodorant from a landfill leachate concentrated solution, aiming at solving the problem that the method for preparing the deodorant from the landfill concentrated solution is difficult.

The purpose of the invention can be realized by the following technical scheme:

a process for preparing deodoriser from the concentrated garbage percolate includes adding coagulant to the concentrated garbage percolate to remove the macromolecular organic substances (humic acid, etc), adding oxidant to the solution for high-grade oxidization to remove the micromolecular organic substances and odour, adding acid and reacting to obtain oxidant₂And ClO₂A composite air deodorant of solution.

Preferably, the coagulant is an iron salt coagulant comprising FeSO₄Or FeCl₃。

Preferably, the dry weight of the coagulant added in each 1L of the landfill leachate concentrated solution is 5-60 g, and solid-liquid separation is carried out after precipitation for 30-60 min after coagulation.

Preferably, the coagulant can be prepared into a 10-30 wt% solution and added in the form of a solution.

Preferably, the oxidant is H₂O₂Or Na₂S₂O₈。

Preferably, 10-50g of oxidizing agent (active ingredient) is added per 1L of solution.

Preferably, the acid is sulfuric acid or hydrochloric acid,

preferably, the pH is adjusted to 1-2 by adding acid.

Preferably, the reaction to produce an oxidizing agent comprises H₂O₂、NaClO₂、NaClO₃Or NaClO₄。

Preferably, 60-160 g of the reaction preparation oxidant is added into each 1L of the solution.

Compared with the prior art, the invention adopts the combined process of coagulation, advanced oxidation and preparation, firstly removes macromolecular organic matters such as humic acid and the like by adopting a coagulation method, removes micromolecular organic matters and odor by adopting an advanced oxidation technology, and then adds acid and an oxidizing agent to prepare the Cl-containing material₂And ClO₂A compound air deodorant of a solution; the method not only can effectively treat the concentrated solution, but also can convert the concentrated solution into an oxidation deodorant which is effective on odor.

Detailed Description

The present invention will be described in detail with reference to specific examples.

Example 1

Firstly, 5g FeCl is added into 1L of concentrated solution₃Removing macromolecular organic matters such as humic acid and the like (by dry weight), adding a coagulant in the form of 10 wt% solution, and precipitating for 30min after coagulation for solid-liquid separation; adding 50gH into each 1L of the solution₂O₂(181g content: 27.5%) is subjected to advanced oxidation to remove small molecular organic substances and odor, hydrochloric acid is added to pH 1, and 27.5g H is added to 1L solution₂O₂(100g content 27.5%) and 132.5g NaClO₃(133.2g content 99.5%) reaction to prepare an oxidizing agent to prepare a solution containing 9-12% Cl₂And ClO₂A composite air deodorant of solution. Can be diluted by 10 times and sprayed at 60m³The room atomizing sprays 100mL of diluent, and after 5min, the concentration of the indoor hydrogen sulfide can be from 80mg/m³Reduced to 10mg/m³The following.

Example 2

Firstly, 60g of FeSO is added into every 1L of concentrated solution₄Removing macromolecular organic matters such as humic acid and the like (by dry weight), adding a coagulant in the form of a 30 wt% solution, and precipitating for 60min after coagulation for solid-liquid separation; 50g of Na is added into each 1L of the solution₂S₂O₈(51g content 98.5%) to remove small molecular organic matter and odor, adding sulfuric acid to pH 2, and adding 60g NaClO to 1L solution₃(60g content: 99.5%) to prepare a solution containing 5% Cl₂And ClO₂A composite air deodorant of solution. Can be diluted by 5 times and sprayed at 60m³The room is atomized and sprayed with 120mL of diluent, and after 5min, the concentration of the indoor hydrogen sulfide can be 40mg/m³Reduced to 10mg/m³The following.

Example 3

Firstly, 60g of FeSO is added into every 1L of concentrated solution₄Removing macromolecular organic matters such as humic acid and the like (by dry weight), adding a coagulant in the form of a 30 wt% solution, and precipitating for 60min after coagulation for solid-liquid separation; 10g H was added to each 1L of the solution₂O₂(36.4g content: 27.5%) was subjected to advanced oxidation to remove small molecular organic substances and odors, sulfuric acid was added to pH 1, and 60g of NaClO was added to 1L of the solution₂(75g content: 80%) to give a solution containing 4-5% Cl₂And ClO₂A composite air deodorant of solution. Can be diluted by 5 times and sprayed at 60m³The room atomizing sprays 200mL of diluent, and after 5min, the concentration of the indoor hydrogen sulfide can be from 30mg/m³Reduced to 10mg/m³The following.

Examples 1 to 3 were carried out by the following series of reactions,

NaClO₃+NaCl+H₂SO₄＝ClO₂+1/2C1₂+Na₂SO₄+H₂O；

sodium chlorate is added to react with salt in water to generate Cl₂And ClO₂(example 2);

under the condition of acidity, the water-soluble organic acid,

5NaClO₂+4HCl＝4ClO₂+5NaCl+2H₂O；

adding sodium chlorite to react with chlorine ion in water to produce ClO₂(example 3);

2HClO₃+H₂O₂＝2ClO₂+O₂+2H₂O；

sodium chlorate is added to be converted into chloric acid under the acidic condition, and the chloric acid is further reacted with hydrogen peroxide to generate ClO₂(example 1).

In which Cl is formed₂And ClO₂Has remarkable functions of deodorization and air purification.

Example 4

This example is essentially the same as example 1, except that in this example 40g of FeSO per 1L of concentrate was added₄(on a dry weight basis).

Example 5

This example is substantially the same as example 1, except that in this example, solid-liquid separation was carried out by precipitation for 45min after coagulation.

Example 6

This example is substantially the same as example 1, except that in this example, 30gH was added to 1L of the solution₂O₂(109g content: 27.5%) was subjected to advanced oxidation to remove small molecular organic substances and odors.

Example 6

This example is essentially the same as example 1 except that in this example, 100g of NaClO was added as the reaction-producing oxidizing agent₄(active ingredient).

The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims

1. A process for preparing deodoriser from the concentrated garbage percolate includes such steps as adding coagulant to said concentrated garbage percolate to remove macromolecular organic substance, adding oxidant to the solution, high-grade oxidizing to remove micromolecular organic substance and odour, adding acid, and reacting to obtain the deodoriser₂And ClO₂A composite air deodorant of solution; the reaction for preparing the oxidant comprises H₂O₂、NaClO₂、NaClO₃Or NaClO₄；

Adding 10-50g of oxidant into every 1L of solution;

the oxidant is H₂O₂Or Na₂S₂O₈；

Adding acid to adjust the pH value to 1-2.

2. The method for preparing deodorant according to claim 1, wherein the coagulant is iron salt coagulant including FeSO coagulant₄Or FeCl₃。

3. The method for preparing a deodorant according to claim 1 or 2, wherein the dry weight of coagulant added per 1L of landfill leachate concentrate is 5-60 g, and solid-liquid separation is performed after 30-60 min of precipitation after coagulation.

4. The method of claim 1, wherein the acid is sulfuric acid or hydrochloric acid.

5. The method for preparing a deodorant according to claim 1, wherein 60-160 g of the reaction preparation oxidant is added to 1L of the solution.