CN111253045A - Steel slag-based town sludge dehydrating agent and dehydrating method thereof - Google Patents
Steel slag-based town sludge dehydrating agent and dehydrating method thereof Download PDFInfo
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- CN111253045A CN111253045A CN202010077854.5A CN202010077854A CN111253045A CN 111253045 A CN111253045 A CN 111253045A CN 202010077854 A CN202010077854 A CN 202010077854A CN 111253045 A CN111253045 A CN 111253045A
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- sludge
- steel slag
- dehydrating agent
- slag
- dehydrating
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
- C02F11/145—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances using calcium compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
Abstract
The invention relates to the technical field of sludge treatment, and particularly discloses a steel slag-based town sludge dehydrating agent and a dehydrating method thereof, wherein the dehydrating agent comprises the following components in percentage by weight: 28-35% of steel slag, 30-40% of slag, 15-25% of phosphogypsum, 5-10% of cement clinker and 2-4% of quick lime; wherein the raw materials are mixed and ground to a certain fineness by adopting a ball mill to prepare the steel slag-based town sludge dehydrating agent. The invention can effectively dehydrate the sludge in cities and towns, solves the problems of high sludge treatment cost, difficult dehydration and the like, effectively realizes a green circulation process for treating wastes with processes of wastes against one another, and can effectively consolidate heavy metal elements in the sludge and reduce the pollution of the heavy metal elements to the environment by effective leaching.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a steel slag-based town sludge dehydrating agent and a dehydrating method thereof.
Background
With the rapid development of the water treatment industry, the production amount of sludge is increased year by year. Sludge, which is a precipitate or semi-solid gelatinous substance generated in the water treatment process, has a complex composition and high water content, contains partial organic matters and heavy metal pollutants, and improper disposal of the sludge causes a plurality of environmental risks, especially heavy metal pollution. Therefore, in the process of sludge reduction treatment, the water content and the leaching concentration of heavy metals must be reduced at the same time.
However, when the prior art deals with the high water content sludge, the reduction of the water content can be dewatered after flocculation by adding various agents, the cost of the agents is generally higher, the cost is higher when a large amount of sludge is dealt with in industry, and in addition, the pollution problem of heavy metal can not be effectively controlled, so the research and development of the dehydrating agent which can reduce the water content and control the heavy metal pollution is urgently needed.
Disclosure of Invention
The invention aims to provide a steel slag-based town sludge dehydrating agent and a dehydrating method thereof, which can effectively dehydrate town sludge, solve the problems of high sludge treatment cost, difficult dehydration and the like, and can effectively consolidate heavy metal elements in the sludge to reduce the pollution of effective leaching to the environment.
In order to solve the technical problems, the invention provides a steel slag-based town sludge dehydrating agent which comprises the following components in percentage by weight:
28 to 35 percent of steel slag,
30-40% of slag,
15 to 25 percent of phosphogypsum,
5 to 10 percent of cement clinker,
2-4% of quick lime;
wherein the raw materials are mixed and ground to a certain fineness by adopting a ball mill to prepare the steel slag-based town sludge dehydrating agent.
Preferably, the fineness criterion is that the sieve residue of 80 μm is less than 1%.
Preferably, the water content of the raw material is not more than 4%.
Preferably, the cement clinker is 32.5 clinker.
The invention also provides a dehydration method of the steel slag-based town sludge dehydrating agent, which comprises the following steps:
(1) adding a certain amount of dehydrating agent into town sludge with the water content of 70-90%, and uniformly stirring and tempering to obtain tempered sludge;
(2) and (4) performing filter pressing treatment on the quenched and tempered sludge by using a plate-and-frame filter press to obtain semi-dried sludge.
As a preferred scheme, the addition amount of the dehydrating agent in the sludge conditioning process is 3-8% of that of the sludge.
The invention has the following beneficial effects:
aiming at the problems that the dehydration is difficult, the material cost is high, the leaching concentration of heavy metals in the dehydrated sludge cannot be effectively controlled, the steel slag, the slag and the phosphogypsum pollute the environment and the like in the conventional sludge dehydration treatment, the invention prepares the dehydration medicament with excellent performance by taking the steel slag, the slag and the phosphogypsum as main raw materials, effectively reduces the sludge dehydration cost, greatly reduces the leaching concentration of heavy metal elements in the sludge, effectively utilizes industrial solid wastes such as the steel slag, the slag and the phosphogypsum and the like, and realizes a green process for treating wastes with wastes.
In addition, the dehydrating agent can make the sludge play a role of a skeleton in the plate-and-frame filter pressing process, and is beneficial to water coming out from the sludge; the raw materials of the dehydrating agent, namely the steel slag and the slag, are subjected to a hydration reaction under the alkali excitation condition, particularly, the steel slag contains a large amount of minerals such as tetracalcium aluminoferrite, and the like, and generates iron-substituted hydrated calcium sulphoaluminate in the presence of phosphogypsum, wherein the iron-substituted hydrated calcium sulphoaluminate is rod-shaped and has certain expansibility, so that the dehydrating agent is beneficial to discharging moisture in the filter pressing process; in addition, the calcium sulphoaluminate ferrate hydrate can also absorb part of heavy metal ions such as AsO43-, CrO 42-and the like through homogeneous replacement, and has a fixing effect on heavy metals.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
(1) the steel slag-based town sludge dehydrating agent is prepared by the embodiment, wherein the steel slag-based town sludge dehydrating agent comprises the following components in percentage by weight: 35% of steel slag, 31% of slag, 22% of phosphogypsum, 10% of cement clinker and 2% of quicklime; the water content of the raw materials is lower than 4%, the raw materials are ground to a certain fineness by a ball mill after being mixed, and the screen allowance of a 80-micrometer square-hole screen is 0.8%, so that the steel slag-based town sludge dehydrating agent is obtained;
(2) taking 50kg of sludge to be treated, wherein the water content of the sludge is 82.12%; weighing 4kg of the steel slag-based town sludge dehydrating agent prepared in the step (1), adding the steel slag-based town sludge dehydrating agent into sludge to be treated, uniformly stirring, and performing filter pressing by using a plate-and-frame filter press to obtain a semi-dried sludge filter cake; the sludge to be treated used in the embodiment is from a sewage treatment plant in Zhaoqing, Guangdong province;
(3) testing the water content of the filter cake and the leaching concentration of the heavy metal; through determination, the water content of the obtained solid filter cake is 52.95%, and the leaching concentration of heavy metal meets the discharge standard of underground IV-type water; the results of the tests on the total amount of heavy metals in the obtained filter cake and the leaching concentration are shown in tables 1 and 2.
Table 1 test results of heavy metal content of filter cake obtained in example 1
| Heavy metals | Arsenic (As) | Cadmium (Cd) | Chromium (hexavalent) | Copper (Cu) | Lead (II) | Mercury | Nickel (II) |
| Content (mg/kg) | 24 | 8 | 5 | 400 | 76 | 9 | 113 |
Table 2 results of testing leaching concentration of heavy metal in filter cake obtained in example 1
| Metal | Arsenic (As) | Cadmium (Cd) | Chromium (hexavalent) | Copper (Cu) | Lead (II) | Mercury | Nickel (II) |
| Content (mg/L) | 0.002 | 0.0001 | Not detected out | 0.03 | 0.001 | Not detected out | 0.01 |
Comparative example 1:
(1) taking 50kg of sludge to be treated with the same parameters as those in example 1;
(2) weighing 4kg of sludge dehydrating agent commonly used in the market, adding the sludge dehydrating agent into sludge to be treated, uniformly stirring, and performing filter pressing by using a plate-and-frame filter press to obtain a semi-dried sludge filter cake;
(3) testing the water content of the filter cake and the leaching concentration of the heavy metal; the water content of the obtained solid filter cake was determined to be 58.04%, and the leaching concentration test results are shown in table 3.
TABLE 3 results of testing the leaching concentration of heavy metals in the filter cake obtained in comparative example 1
| Metal | Arsenic (As) | Cadmium (Cd) | Chromium (hexavalent) | Copper (Cu) | Lead (II) | Mercury | Nickel (II) |
| Content (mg/L) | 0.089 | 0.0043 | 0.007 | 1.3 | 0.007 | 0.0003 | 0.025 |
Example 2:
(1) the steel slag-based town sludge dehydrating agent is prepared by the embodiment, wherein the steel slag-based town sludge dehydrating agent comprises the following components in percentage by weight: 30% of steel slag, 36% of slag, 20% of phosphogypsum, 10% of cement clinker and 4% of quicklime; the water content of the raw materials is lower than 4%, the raw materials are ground to a certain fineness by a ball mill after being mixed, and the screen allowance of a 80-micrometer square-hole screen is 0.8%, so that the steel slag-based town sludge dehydrating agent is obtained;
(2) taking 50kg of sludge to be treated, wherein the water content of the sludge is 78.61%; weighing 2kg of the steel slag-based town sludge dehydrating agent prepared in the step (1), adding the steel slag-based town sludge dehydrating agent into sludge to be treated, uniformly stirring, and performing filter pressing by using a plate-and-frame filter press to obtain a semi-dried sludge filter cake; the sludge to be treated used in the embodiment is from a sewage treatment plant floating in cloud in Guangdong province;
(3) testing the water content of the filter cake and the leaching concentration of the heavy metal; through determination, the water content of the obtained solid filter cake is 53.77%, and the leaching concentration of heavy metal meets the discharge standard of underground IV-type water; the results of the tests on the total amount of heavy metals in the obtained filter cake and the leaching concentration are shown in tables 4 and 5.
Table 4 test results of heavy metal content of filter cake obtained in example 2
| Heavy metals | Arsenic (As) | Cadmium (Cd) | Chromium (hexavalent) | Copper (Cu) | Lead (II) | Mercury | Nickel (II) |
| Content (mg/kg) | 46 | 8 | 6 | 380 | 76 | 9 | 113 |
Table 5 results of testing the leaching concentration of heavy metal in the filter cake obtained in example 2
| Metal | Arsenic (As) | Cadmium (Cd) | Chromium (hexavalent) | Copper (Cu) | Lead (II) | Mercury | Nickel (II) |
| Content (mg/L) | 0.002 | Not detected out | 0.0001 | 0.04 | 0.002 | Not detected out | 0.02 |
Comparative example 2:
(1) taking 50kg of sludge to be treated with the same parameters as those in example 2;
(2) weighing 2kg of sludge dehydrating agent commonly used in the market, adding the sludge dehydrating agent into sludge to be treated, uniformly stirring, and performing filter pressing by using a plate-and-frame filter press to obtain a semi-dried sludge filter cake;
(4) testing the water content of the filter cake and the leaching concentration of the heavy metal; the water content of the obtained solid filter cake was determined to be 59.17%, and the leaching concentration test results are shown in table 6.
TABLE 6 results of testing the leaching concentration of heavy metals in the filter cake obtained in comparative example 2
| Metal | Arsenic (As) | Cadmium (Cd) | Chromium (hexavalent) | Copper (Cu) | Lead (II) | Mercury | Nickel (II) |
| Content (mg/L) | 0.13 | 0.0057 | 0.009 | 1.7 | 0.012 | 0.0007 | 0.046 |
As can be seen from comparative examples 1 and 2, part of indexes of the heavy metal leaching concentration of the filter cake do not accord with the underground IV-type water discharge standard, and most of indexes are close to the standard discharge value; as can be seen from the examples 1 and 2, all indexes of the heavy metal leaching concentration of the filter cake meet the underground IV-type water discharge standard and are greatly lower than the standard discharge limit value; meanwhile, the water content of the solid filter cakes treated in the embodiments 1 and 2 is lower than that of the solid filter cakes treated in the comparative examples 1 and 2, and the dewatering effect is better.
Compared with the traditional dehydrating agents in the market, the steel slag-based town sludge dehydrating agent has good dehydrating effect, and can effectively consolidate heavy metal elements in sludge and reduce the pollution of the heavy metal elements to the environment caused by effective leaching.
It is worth to be noted that the steel slag is the slag discharged from steel making, and mainly comprises calcium, iron, silicon, magnesium and a small amount of oxides of aluminum, manganese, phosphorus and the like; the slag is used as the residue of ore after mineral processing or smelting, and the main components of the slag are high-activity silicate and aluminosilicate; phosphogypsum is an industrial byproduct generated when phosphate ore is treated by sulfuric acid in the production process of phosphoric acid or phosphate fertilizer, and the main component of the phosphogypsum is calcium sulfate dihydrate. The steel slag, the slag and the phosphogypsum are used as industrial solid wastes, certain pollution is caused to enterprises and production environment, but the steel slag, the slag and the phosphogypsum can be used for producing the dehydrating agent of the invention, if the steel slag, the slag and the phosphogypsum are effectively compounded in the sludge dehydrating process and then heavy metal elements in the sludge are effectively fixed, the sludge treatment cost is effectively reduced, and the effective utilization of the steel slag, the slag and the phosphogypsum has important significance.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (6)
1. A steel slag-based town sludge dehydrating agent is characterized in that: the steel slag-based town sludge dehydrating agent comprises the following components in percentage by weight:
28 to 35 percent of steel slag,
30-40% of slag,
15 to 25 percent of phosphogypsum,
5 to 10 percent of cement clinker,
2-4% of quick lime;
wherein the raw materials are mixed and ground to a certain fineness by adopting a ball mill to prepare the steel slag-based town sludge dehydrating agent.
2. The steel slag-based town sludge dewatering agent according to claim 1, wherein the standard of fineness is that the amount of the screen residue with a fineness of 80 μm is less than 1%.
3. The steel slag-based town sludge dewatering agent as claimed in claim 1, wherein the raw material has a moisture content of not more than 4%.
4. The steel slag-based town sludge dewatering agent according to claim 1, wherein said cement clinker is 32.5 clinker.
5. The method for dewatering the steel slag-based town sludge dewatering agent as defined in any one of claims 1 to 4, comprising the steps of:
(1) adding a certain amount of dehydrating agent into town sludge with the water content of 70-90%, and uniformly stirring and tempering to obtain tempered sludge;
(2) and (4) performing filter pressing treatment on the quenched and tempered sludge by using a plate-and-frame filter press to obtain semi-dried sludge.
6. The method for dehydrating the steel slag-based town sludge dehydrating agent according to claim 5, wherein the amount of the dehydrating agent added in the process of tempering the sludge is 3-8% of the sludge.
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| CN202010077854.5A CN111253045A (en) | 2020-02-01 | 2020-02-01 | Steel slag-based town sludge dehydrating agent and dehydrating method thereof |
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| CN202010077854.5A CN111253045A (en) | 2020-02-01 | 2020-02-01 | Steel slag-based town sludge dehydrating agent and dehydrating method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103787624A (en) * | 2014-02-15 | 2014-05-14 | 江苏坤泽科技股份有限公司 | Environment-friendly type steel slag based sludge curing agent |
| CN104045298A (en) * | 2014-06-17 | 2014-09-17 | 三峡大学 | Preparation method of phosphogypsum-based sludge drying agent and application of preparation method in drying sludge |
| CN105174686A (en) * | 2015-10-12 | 2015-12-23 | 北京高能时代环境技术股份有限公司 | Curing agent for curing and stabilizing municipal dewatered sludge and preparation method and application of curing agent |
| CN105271630A (en) * | 2015-09-24 | 2016-01-27 | 葛洲坝中固科技股份有限公司 | Energy-saving and environment-protection sludge modified material and preparation method thereof |
| CN106467745A (en) * | 2015-08-17 | 2017-03-01 | 武汉大学 | It is suitable for the steel slag and desulfurized gypsum base soil-solidified-agent of As polluted soil |
| EP3858792A1 (en) * | 2018-09-29 | 2021-08-04 | Baoshan Iron & Steel Co., Ltd. | Method and apparatus for direct drying of inorganic sludge with drum drawing process |
-
2020
- 2020-02-01 CN CN202010077854.5A patent/CN111253045A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103787624A (en) * | 2014-02-15 | 2014-05-14 | 江苏坤泽科技股份有限公司 | Environment-friendly type steel slag based sludge curing agent |
| CN104045298A (en) * | 2014-06-17 | 2014-09-17 | 三峡大学 | Preparation method of phosphogypsum-based sludge drying agent and application of preparation method in drying sludge |
| CN106467745A (en) * | 2015-08-17 | 2017-03-01 | 武汉大学 | It is suitable for the steel slag and desulfurized gypsum base soil-solidified-agent of As polluted soil |
| CN105271630A (en) * | 2015-09-24 | 2016-01-27 | 葛洲坝中固科技股份有限公司 | Energy-saving and environment-protection sludge modified material and preparation method thereof |
| CN105174686A (en) * | 2015-10-12 | 2015-12-23 | 北京高能时代环境技术股份有限公司 | Curing agent for curing and stabilizing municipal dewatered sludge and preparation method and application of curing agent |
| EP3858792A1 (en) * | 2018-09-29 | 2021-08-04 | Baoshan Iron & Steel Co., Ltd. | Method and apparatus for direct drying of inorganic sludge with drum drawing process |
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Effective date of registration: 20210201 Address after: 526000 Dengjun Digital City, 21 Industrial Avenue, Zhaoqing High-tech Zone, Guangdong Province, 3rd floor Applicant after: Zhaoqing Wuda Institute of environmental technology Address before: 526238 3rd floor, Dengjun Digital City, high tech Zone, Zhaoqing City, Guangdong Province Applicant before: Zhaoqing Quanxing Ecology Technology Co.,Ltd. |
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Application publication date: 20200609 |