CN112661379A

CN112661379A - Pollution-free sludge treatment process and application thereof

Info

Publication number: CN112661379A
Application number: CN202011520178.0A
Authority: CN
Inventors: 李香祖; 王群力
Original assignee: Qingdao Lingjun Environmental Engineering Co ltd
Current assignee: Qingdao Lingjun Environmental Engineering Co ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-04-16

Abstract

The invention belongs to the technical field of sludge treatment, and particularly relates to a pollution-free sludge treatment process and application thereof. A sludge pollution-free treatment process comprises the following steps: 1) dewatering sewage by a centrifugal machine to obtain a sludge sample with the water content of 60-85%; 2) adding the obtained sludge sample into a plastic beaker, adding a sludge modifier and a gel breaker, carrying out cross stirring, and mixing to obtain a treated sludge sample; 3) irradiating the sludge sample treated in the step 2) by rays to obtain harmless sludge; 4) drying the harmless sludge obtained in the step 3) to obtain dried sludge for later use. The pollution-free sludge treatment process developed by the invention can fully separate out water and obviously reduce the water content in the dewatered sludge, thereby reducing the generation amount of the sludge; the sludge treated by the pollution-free sludge treatment process developed by the invention is yellow, has light smell, small solid blocks, is easy to break and has strong plasticity.

Description

Pollution-free sludge treatment process and application thereof

Technical Field

The invention belongs to the technical field of sludge treatment, and particularly relates to a pollution-free sludge treatment process and application thereof.

Background

Along with the increase of the sewage discharge amount, the generation amount of sludge is also rapidly increased, and the sludge contains a large amount of pathogenic bacteria, parasitic ova and heavy metals; if the sludge is not properly treated, the sludge brings great harm to the environment. Sludge treatment is a process of carrying out reduction, stabilization and harmless treatment on sludge. The higher the degree of wastewater treatment, the more sludge residue will be produced to be treated. A general sewage treatment plant must be provided with a sludge treatment facility unless the sewage is treated using land treatment or a sewage pond. For modern sewage treatment plants, the treatment and disposal of sludge has become the most complex and costly part of the operation of sewage treatment systems.

At the present stage, people are faced with the reduction of land resources, and people are trying to explore a method for protecting the land resources. The method has the advantages that the method faces increasingly serious sludge harm, if the quality of the sludge is improved, the sludge is changed into valuable, the environmental pollution can be reduced, and the damage and waste of land resources can be relieved to a great extent.

In order to solve the problem of sludge pollution, the development of a pollution-free method for treating and utilizing sludge has become an important issue for researchers.

Disclosure of Invention

In order to solve the technical problems, the first aspect of the invention provides a sludge pollution-free treatment process, which comprises the following steps:

1) dewatering sewage by a centrifugal machine to obtain a sludge sample with the water content of 60-85%;

2) adding the obtained sludge sample into a plastic beaker, adding a sludge modifier and a gel breaker, carrying out cross stirring, and mixing to obtain a treated sludge sample;

3) irradiating the sludge sample treated in the step 2) by rays to obtain harmless sludge;

4) drying the harmless sludge obtained in the step 3) to obtain dried sludge for later use.

As a preferable technical solution, the sludge modifier in step 2) is at least one selected from a deodorant, a plasticizer and a bactericide.

As a preferable technical scheme, the sludge modifier in the step 2) is selected from a deodorant and a plasticizer; the plasticizer is added in an amount of 50-80 wt% based on the weight of the deodorant.

As a preferable technical scheme, the preparation raw material of the deodorant comprises, by weight, 5-15 wt% of plant extract, 1-4 wt% of modified chitosan, 5-10 wt% of surfactant and the balance of water to 100%.

As a preferable technical scheme, the weight average molecular weight of the modified chitosan is 30000-100000.

In a preferred embodiment, the surfactant is one or more selected from polyoxyethylene surfactants, polyol surfactants, and quaternary ammonium surfactants.

As a preferred technical solution, the plant extract is selected from ginkgo biloba extract, tea extract, and jasmine extract.

As a preferable technical scheme, the weight of the gel breaker in the step 2) is 5-30 wt% of the weight of the sludge.

As a preferable technical scheme, the weight of the gel breaker in the step 2) is 15-20 wt% of the weight of the sludge.

The second aspect of the invention provides application of a sludge pollution-free treatment process, which is applied to the field of green buildings.

Has the advantages that:

1. the pollution-free sludge treatment process developed by the invention can separate solid impurities in the sludge from water, fully separate out the water, and obviously reduce the water content in the dewatered sludge, thereby reducing the production amount of the sludge;

2. the sludge treated by the pollution-free sludge treatment process developed by the invention is yellow, has light smell, small solid blocks, is easy to break and has strong plasticity;

3. the environment-friendly deodorant adopted in the sludge pollution-free treatment process developed by the invention is safe and environment-friendly, avoids the use of organic reagents, and provides guarantee for the green building application of sludge.

Detailed Description

The invention will be further understood by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. To the extent that a definition of a particular term disclosed in the prior art is inconsistent with any definitions provided herein, the definition of the term provided herein controls.

As used herein, a feature that does not define a singular or plural form is also intended to include a plural form of the feature unless the context clearly indicates otherwise. It will be further understood that the term "prepared from …," as used herein, is synonymous with "comprising," including, "comprising," "having," "including," and/or "containing," when used in this specification means that the recited composition, step, method, article, or device is present, but does not preclude the presence or addition of one or more other compositions, steps, methods, articles, or devices. Furthermore, the use of "preferred," "preferably," "more preferred," etc., when describing embodiments of the present application, is meant to refer to embodiments of the invention that may provide certain benefits, under certain circumstances. However, other embodiments may be preferred, under the same or other circumstances. In addition, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.

In some preferred embodiments, the sludge sample is 1000 parts by weight.

In some preferred embodiments, the sludge modifier in step 2) is selected from at least one of a deodorant, a plasticizer and a bactericide.

In some preferred embodiments, the sludge modifier in step 2) is selected from a deodorant and a plasticizer.

In some preferred embodiments, the weight of the sludge modifier is 5 to 10 wt% of the weight of the sludge.

In some preferred embodiments, the weight of the sludge modifier is 6 wt% of the weight of the sludge.

In some preferred embodiments, the plasticizer is added in an amount of 50 to 80 wt% based on the weight of the deodorant.

In some preferred embodiments, the plasticizer is added in an amount of 50% by weight of the deodorant.

Plasticizer, model SK50, available from heuchun kekai plasticizer technology ltd.

In some preferred embodiments, the raw materials for preparing the deodorant comprise, by weight, 5-15% of plant extract, 1-4% of modified chitosan, 5-10% of surfactant, and the balance of water to 100%.

In some preferred embodiments, the modified chitosan has a weight average molecular weight of 30000-100000.

In some preferred embodiments, the modified chitosan has a weight average molecular weight of 50000.

Chitosan, model C850347, was purchased from the mclin chemical reagent gay.

In some preferred embodiments, the modified chitosan is an acetic acid modified chitosan.

In some preferred embodiments, the modified chitosan is prepared from the following raw materials in parts by weight: 10-20 parts of chitosan and 50-80 parts of acetic acid aqueous solution with the mass concentration of 2%.

In some preferred embodiments, the method for preparing the modified chitosan comprises the steps of:

mixing chitosan and acetic acid water solution, and fully stirring until the chitosan and the acetic acid water solution are dissolved to obtain modified chitosan for later use.

In some preferred embodiments, the surfactant is selected from one or more of polyoxyethylene type surfactant, polyol type surfactant, quaternary ammonium salt surfactant.

In some preferred embodiments, the polyol-type surfactant is at least one selected from the group consisting of lauric sorbitan monoester, palmitic sorbitan monoester, stearic sorbitan monoester, and oleic sorbitan monoester.

In some preferred embodiments, the quaternary ammonium surfactant is selected from at least one of cetyltrimethylammonium chloride, octadecyltrimethylammonium chloride, dodecyldimethylbenzylammonium chloride.

In some preferred embodiments, the weight ratio of sorbitan stearate monoester to dodecyldimethylbenzylammonium chloride is 1: 1.2-2.

In some preferred embodiments, the plant extract is selected from the group consisting of ginkgo biloba extract, tea leaf extract, jasmine extract.

Ginkgo leaf extract

Ginkgo biloba leaf Extract (GBE) is a product with rich extracted effective components by using Ginkgo biloba leaves as a raw material and adopting a proper solvent. Various preparations prepared by taking GBE as a raw material are widely applied to the fields of medicines, health-care products, food additives, functional beverages, cosmetics and the like.

Ginkgo biloba leaf extract, CAS number 90045-36-6, was purchased from Ogawa Biotech limited.

In some preferred embodiments, the tea extract is selected from green tea extract.

Green tea extract

The green tea extract is an active component extracted from green tea leaves, and mainly comprises tea polyphenol, caffeine, aromatic oil, water, minerals, pigments, carbohydrates, proteins, amino acids, vitamins and the like.

Green tea extract, available from sierra forest biotechnology limited.

Jasmine flower extract

Flos Jasmini SAMBAC EXTRACT, known as Jasminum SAMBAC (Jasmine) FLOWER EXTRACT. Jasmine, evergreen shrubs or vine-like shrubs, up to 1 meter in height. The slender small branches of the branches have edges and corners, sometimes have hairs and are slightly in the shape of vines. The single leaf is opposite, bright, wide oval or elliptical, the veins are obvious, the leaf surface is slightly wrinkled, the leaf stalk is short and bent upwards, and the leaf has short and soft hair. In early summer, new tips are drawn from axilla of leaves, the tip grows to form an umbrella inflorescence, the tip grows or the axilla grows, 3-9 flowers, usually three to four flowers, the corolla is white and extremely fragrant. The flowering period of most varieties is 6-10 months, the flowers are not completely bloomed from early summer to late autumn, the flowers are bloomed in winter in a defoliation type, and the flowering period is 11 months to 3 months in the second year.

Jasmine extract, cat # REL-MLH10, available from Sierra bioengineering, Inc.

In some preferred embodiments, the weight ratio of the ginkgo biloba extract, the tea leaf extract and the jasmine flower extract is 1: 0.5-1: 0.8-1.3.

In some preferred embodiments, the method of preparing a deodorant comprises the steps of:

dissolving the plant extract, the modified chitosan and the surfactant in water, stirring for 20-40 minutes, drying, and sieving with a 100-mesh and 500-mesh sieve to prepare the deodorant.

In some preferred embodiments, the weight of the breaker of step 2) is 5-30 wt% of the weight of the sludge.

In some preferred embodiments, the weight of the gel breaker in step 2) is 15-20 wt% of the weight of the sludge.

In some preferred embodiments, the weight of the breaker of step 2) is 20 wt% of the weight of the sludge.

The gel breaker, cat # 0027, was purchased from Hibei Polygol New materials science and technology Co.

The second aspect of the invention provides application of the sludge, which is treated by the treatment process and applied to the field of green buildings.

The pollution-free sludge treatment process developed by the invention can separate solid impurities in the sludge from water, fully separate out the water, and obviously reduce the water content in the dewatered sludge, thereby reducing the production amount of the sludge; the sludge treated by the pollution-free sludge treatment process developed by the invention is yellow, has light smell, small solid blocks, is easy to break and has strong plasticity; the environment-friendly deodorant adopted in the sludge pollution-free treatment process developed by the invention is safe and environment-friendly, avoids the use of organic reagents, and provides guarantee for the green building application of sludge.

The present invention will be specifically described below by way of examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention.

In addition, the starting materials used are all commercially available, unless otherwise specified.

Examples

Example 1

A sludge pollution-free treatment process comprises the following steps:

1) dewatering sewage by a centrifugal machine to obtain a sludge sample with the water content of 80%;

3) irradiating the sludge sample treated in the step 2) by gamma rays to obtain harmless sludge;

Wherein the sludge comprises 1000 parts by weight of sludge, 60 parts by weight of sludge modifier and 20 parts by weight of gel breaker.

The sludge modifier is selected from a plasticizer and a deodorant; wherein, 20 parts of plasticizer and 40 parts of deodorant.

The preparation raw materials of the deodorant comprise, by weight, 10% of plant extract, 2% of modified chitosan, 6% of surfactant and the balance of water to 100%.

The plant extract comprises: folium Ginkgo extract, green tea extract, and flos Jasmini sambac extract; the weight ratio is 1: 0.7: 1.3.

the weight average molecular weight of the modified chitosan was 50000.

The modified chitosan is prepared from the following raw materials in parts by weight: 10 parts of chitosan and 60 parts of acetic acid aqueous solution with the mass concentration of 2%.

The preparation method of the modified chitosan comprises the following steps:

The surfactant is selected from stearic acid sorbitan monoester and dodecyl dimethyl benzyl ammonium chloride, and the weight ratio is 1: 1.5.

the preparation method of the deodorant comprises the following steps:

dissolving plant extract, modified chitosan and surfactant in water, stirring for 30 min, drying, sieving with 300 mesh sieve, and making into deodorant.

A gel breaker, product number 0027, available from hippur gold new materials science and technology ltd; plasticizer, model SK50, available from heuchun kekai plasticizer science and technology ltd; chitosan, model C850347, available from michelin chemical reagent official gay; ginkgo biloba extract, CAS number 90045-36-6, available from Hippon Aicai Biotech Co., Ltd; green tea extract, available from sienna ruilin biotechnology limited; jasmine extract, cat # REL-MLH10, available from sierra zerland bioengineering, ltd; stearic acid sorbitan monoester, purchased from Shanghai Beike chemical Co., Ltd; dodecyl dimethyl benzyl ammonium chloride, available from Wenchang trade, Inc., Guangzhou.

The application of the sludge is applied to the field of green buildings through the treatment process.

Example 2

The specific implementation mode of the sludge pollution-free treatment process is the same as that of example 1, and the difference of the sludge pollution-free treatment process from example 1 is that the weight part of the gel breaker is 10 parts.

Example 3

The specific implementation mode of the sludge pollution-free treatment process is the same as that of example 1, and the difference of the sludge pollution-free treatment process from example 1 is that 15 parts by weight of a gel breaker is adopted.

Example 4

The specific implementation mode of the sludge pollution-free treatment process is the same as that of example 1, and the difference of the sludge pollution-free treatment process from example 1 is that 50 parts by weight of a gel breaker is adopted.

Example 5

The specific implementation mode of the sludge pollution-free treatment process is the same as that of the example 1, and the sludge pollution-free treatment process is different from the example 1 in that the sludge pollution-free treatment process does not contain a plasticizer.

Example 6

The specific implementation mode of the sludge pollution-free treatment process is the same as that in example 1, and the preparation raw material of the deodorant does not contain dodecyl dimethyl benzyl ammonium chloride unlike example 1.

Example 7

A sludge pollution-free treatment process is carried out in the same manner as in example 1 except that the plant extract contained in the raw material for preparing the deodorizer is only ginkgo biloba leaf extract, which is a specific embodiment of the sludge pollution-free treatment process in example 1.

Example 8

The sludge pollution-free treatment process is the same as the embodiment 1, and the specific implementation mode is that no gamma ray is irradiated in the step 3) different from the embodiment 1.

Comparative example 1

A sludge treatment process comprises the following steps:

2) adding the obtained sludge sample into a plastic beaker, and adding a gel breaker, wherein the gel breaker is 30 wt% of the sludge;

3) drying the sludge obtained in the step 2) to obtain dried sludge.

Wherein the weight portion of the sludge is 1000 portions.

Comparative example 2

The sludge treatment process is implemented in the same manner as in comparative example 1, except that the gel breaker in step 2) is 20 wt% of the sludge.

And (3) performance testing:

1. and (3) testing the appearance odor of the treated sludge: the treated sludge of examples 1 to 8 was subjected to an appearance odor test, and the treated effect was determined by appearance color judgment and odor judgment, and the results were counted in table 1 below.

2. Judging the friability degree of the sludge: the sludge treated in examples 1 to 8 was crushed and the treated sludge was made to 1cm³The pellets were then pressed with the thumb and forefinger, the manual crush was assigned as excellent friability, the deformation was considered good, the failure to crush was considered poor, and the test results were statistically reported in table 1 below.

Table 1:

experiment of	Appearance and smell	Degree of frangibility
			Example 1	Yellow in color and light in smell	Superior food
Example 2	Black color and slight sludge odor	Superior food
			Example 3	Black color and light smell	Good wine
Example 4	Black color and light smell	Difference (D)
			Example 5	Yellow in color and light in smell	Difference (D)
Example 6	Black color and sludge odor	Good wine
			Example 7	Yellow color and sludge odor	Good wine
Example 8	Black color and sludge odor	Good wine

3. And (3) testing sludge: the treated sludge of example 1, comparative example 1 and comparative example 2 is tested, the test standard is GB/T7959-2012, and the test results are counted in the following table 2.

Note: the control run was the same untreated sludge as in step 1) of example 1.

Finally, it should be understood that the above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any modification, equivalent replacement, or improvement made within the protection principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The pollution-free sludge treatment process is characterized by comprising the following steps:

2. The pollution-free sludge treatment process according to claim 1, wherein the sludge modifier in the step 2) is at least one selected from a deodorant, a plasticizer and a bactericide.

3. The pollution-free sludge treatment process according to claim 2, wherein the sludge modifier in the step 2) is selected from a deodorant and a plasticizer; the plasticizer is added in an amount of 50-80 wt% based on the weight of the deodorant.

4. The pollution-free sludge treatment process as claimed in claim 3, wherein the raw materials for preparing the deodorant comprise, by weight, 5-15% of plant extract, 1-4% of modified chitosan, 5-10% of surfactant, and the balance of water to 100%.

5. The pollution-free sludge treatment process as claimed in claim 4, wherein the modified chitosan has a weight average molecular weight of 30000-100000.

6. The pollution-free sludge treatment process according to claim 4, wherein the surfactant is one or more selected from polyoxyethylene type surfactant, polyol type surfactant and quaternary ammonium salt surfactant.

7. The pollution-free sludge treatment process as claimed in claim 4, wherein the plant extract is selected from ginkgo biloba extract, tea extract, jasmine extract.

8. The sludge pollution-free treatment process as claimed in claim 1, wherein the weight of the gel breaker in the step 2) is 5-30 wt% of the weight of the sludge.

9. The sludge pollution-free treatment process as claimed in claim 8, wherein the weight of the gel breaker in the step 2) is 15-20 wt% of the weight of the sludge.

10. Use of the process for pollution-free treatment of sludge according to any one of claims 1 to 9 in the field of green construction.