CN111517607B - Organic sludge treatment method - Google Patents
Organic sludge treatment method Download PDFInfo
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- CN111517607B CN111517607B CN202010423110.4A CN202010423110A CN111517607B CN 111517607 B CN111517607 B CN 111517607B CN 202010423110 A CN202010423110 A CN 202010423110A CN 111517607 B CN111517607 B CN 111517607B
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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
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
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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
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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
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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
- C02F11/15—Treatment of sludge; Devices therefor by de-watering, drying or thickening by treatment with electric, magnetic or electromagnetic fields; by treatment with ultrasonic waves
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to the technical field of organic sludge treatment, in particular to an organic sludge treatment method, which comprises the following steps: (1) Adding an acid-base regulator into the organic sludge raw material, regulating the pH value to 7-8.5, adding a polymerization agent, mixing, and polymerizing, wherein the dosage of the polymerization agent is 100-150mg/L and the polymerization time is 30-50min relative to the organic sludge raw material, so as to obtain a polymerization product; (2) Carrying out primary ultrasonic treatment on the polymerization product, wherein the primary ultrasonic intensity is 0.1-0.17W/mL, and the primary ultrasonic time is 10-20min; (3) Cracking the product obtained in the step (2) in an oxygen-free atmosphere, wherein the cracking temperature is 550-700 ℃, and the cracking time is 30-70min; (4) And (4) carrying out secondary ultrasonic treatment on the product obtained in the step (3), wherein the secondary ultrasonic intensity is 0.3-0.4W/mL, and the secondary ultrasonic time is 7-15min, so as to obtain the dried powdery sludge. Compared with the prior art, the moisture content of the dried powdery sludge obtained after treatment by the method is below 0.5%, and the weight can be reduced by 15-28%.
Description
Technical Field
The invention relates to the technical field of organic sludge treatment, in particular to an organic sludge treatment method.
Background
Enterprises need to properly dispose of organic sludge produced in production activities.
At present, the following methods are generally adopted for treating organic sludge: 1. sludge agriculture: but the agricultural conditions of the sludge are strict: has strict standards on organic toxic and harmful substances, pathogenic microorganisms and the like in the sludge, so the application is limited to a certain extent. 2. Sludge landfill: the landfill method has some problems as follows: because the water content of the sludge is high and the leachate belongs to high-concentration organic sewage, the leachate needs to be collected and treated to prevent secondary pollution; the working difficulty of the landfill compaction machinery is increased; the sanitary condition of the landfill site is bad. 3. Sludge drying and heat treatment: the direct drying has the defects of large energy consumption, generally 1 ton of dry sludge (with the water content of 10 percent) is produced, more coal is consumed by one ton, the treatment cost is increased, and the influence on the surrounding environment is large. 4. Sludge incineration: there are several problems: (1) the investment and operation cost is high; (2) Fly ash, slag and flue gas generated in the incineration process have great influence on the environment; (3) the useful components in the sludge are not fully utilized.
However, after the organic sludge is treated by the current treatment method, the water content of the organic sludge is high, and the requirement cannot be met.
Disclosure of Invention
The invention aims to overcome the defect that the water content of organic sludge is higher and can not meet the requirement in the prior art, and provides an organic sludge treatment method, wherein the water content of the organic sludge treated by the method is less than 0.5%, and the weight of the organic sludge is reduced by 15-28%.
The inventor of the invention finds that a polymerization product is formed by polymerizing organic sludge for 30-50min under certain pH, and then the polymerization product is sequentially subjected to primary ultrasonic treatment, pyrolysis and secondary ultrasonic treatment, wherein the primary ultrasonic intensity is 0.1-0.17W/mL, the primary ultrasonic time is 10-20min, the secondary ultrasonic intensity is 0.3-0.4W/mL, and the secondary ultrasonic time is 7-15min; the water and organic matters in the organic sludge raw material can be effectively removed, the weight can be reduced by 15-28%, and the water content in the dried powdery sludge obtained after treatment is below 0.5%.
In order to achieve the above object, the present invention provides an organic sludge treatment method comprising the steps of:
(1) Adding an acid-base regulator into the organic sludge raw material, regulating the pH value to 7-8.5, adding a polymerization agent, mixing, and polymerizing, wherein the dosage of the polymerization agent is 100-150mg/L and the polymerization time is 30-50min relative to the organic sludge raw material, so as to obtain a polymerization product;
(2) Carrying out primary ultrasonic treatment on the polymerization product, wherein the primary ultrasonic intensity is 0.1-0.17W/mL, and the primary ultrasonic time is 10-20min;
(3) Cracking the product obtained in the step (2) in an oxygen-free atmosphere, wherein the cracking temperature is 550-700 ℃, and the cracking time is 30-70min;
(4) And (4) carrying out secondary ultrasonic treatment on the product obtained in the step (3), wherein the secondary ultrasonic intensity is 0.3-0.4W/mL, and the secondary ultrasonic time is 7-15min, so as to obtain the dried powdery sludge.
Compared with the prior art, the organic sludge treatment method provided by the invention can effectively remove water and organic matters in the organic sludge raw material, so that the water content in the dried powdery sludge obtained after treatment is below 0.5%, and the weight can be reduced by 15-28%, and the reason probably is that: polymerizing the organic sludge for a certain time to form a polymerization product with a net-shaped structure in a certain size range, wherein the polymerization product can form local adhesion and local decomposition of the net-shaped structure of the polymerization product after being subjected to ultrasonic treatment under the specific primary ultrasonic intensity, so that a net-shaped channel is formed in the organic sludge; then anaerobic cracking is carried out, so that the water and organic matters in the organic sludge are effectively evaporated and removed at high temperature through the reticular channel; and then, performing secondary ultrasound under the specific secondary ultrasound intensity to ensure that the cracked product is thoroughly crushed and thoroughly dried through the reticular channel, so that the water and organic matters in the organic sludge are efficiently removed. Moreover, the method is simple to operate, green and environment-friendly, and various sludge modifiers are not required to be added; the dried powdery sludge obtained by treatment does not contain organic poison, is convenient for post-treatment, and does not need expensive and complicated air pollution treatment equipment during refining treatment because the dried powdery sludge does not contain organic poison.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
As described above, the present invention provides an organic sludge treatment method comprising the steps of:
(1) Adding an acid-base regulator into the organic sludge raw material, regulating the pH value to 7-8.5, adding a polymerization agent, mixing, and polymerizing, wherein the dosage of the polymerization agent is 100-150mg/L and the polymerization time is 30-50min relative to the organic sludge raw material, so as to obtain a polymerization product;
(2) Carrying out primary ultrasonic treatment on the polymerization product, wherein the primary ultrasonic intensity is 0.1-0.17W/mL, and the primary ultrasonic time is 10-20min;
(3) Cracking the product obtained in the step (2) in an oxygen-free atmosphere, wherein the cracking temperature is 550-700 ℃, and the cracking time is 30-70min;
(4) And (4) carrying out secondary ultrasonic treatment on the product obtained in the step (3), wherein the secondary ultrasonic intensity is 0.3-0.4W/mL, and the secondary ultrasonic time is 7-15min, so as to obtain the dried powdery sludge.
Preferably, the polymerization agent is polyaluminum ferric chloride. By adopting the preferable technical scheme of the invention, the water content of the treated organic sludge can be further reduced.
In a preferred embodiment of the present invention, the step (3) further comprises: performing a pre-lysis prior to performing said lysis.
Preferably, the conditions of the pre-lysis include: in oxygen-free atmosphere, the pre-cracking temperature is 150-300 ℃, and the pre-cracking time is 30-50min. By adopting the preferable technical scheme, the condition of organic sludge coking can be avoided, and the inner part and the surface of the organic sludge are cracked more uniformly.
Preferably, the water content of the organic sludge raw material is 60wt% or more. The water content of the organic sludge raw material is too low to be beneficial to polymerization.
In a preferred embodiment of the invention, the pH is adjusted in step (1) to a value of 7 to 7.5.
The pH regulator is not limited in the invention, as long as the pH can be regulated to the required range, and the pH regulator which is environment-friendly and does not bring secondary waste is preferably adopted. Preferably, the acid-base regulator in step (1) is hydrochloric acid or sodium hydroxide solution. The hydrochloric acid concentration is preferably 10wt%, and the sodium hydroxide solution concentration is preferably 0.8wt%.
According to the invention, the polymerization in step (1) is preferably carried out with stirring at a rate of from 0.5 to 2m/s. The stirring rate should not be too high or too low, too low of which may affect the polymerization effect, especially the uniformity of polymerization, and too high of which may cause the particle size of the polymerization product to be small and may affect the subsequent removal of organic substances and water.
According to the invention, the water content of the dried powdery sludge in the step (4) is preferably below 0.5%.
According to a preferred embodiment of the present invention, the method for treating organic sludge comprises the steps of:
(1) Adding 10wt% of hydrochloric acid into an organic sludge raw material with the water content of more than 60wt%, adjusting the pH value to 7-7.5, adding polyaluminum ferric chloride, and mixing, wherein the dosage of the polymerization agent is 100-150mg/L relative to the organic sludge raw material, and the polymerization is carried out under the stirring of 0.5-2m/s for 30-50min to obtain a polymerization product;
(2) Carrying out primary ultrasonic treatment on the polymerization product, wherein the primary ultrasonic intensity is 0.1-0.17W/mL, and the primary ultrasonic time is 10-20min;
(3) Sequentially carrying out pre-cracking and cracking on the product obtained in the step (2) in an oxygen-free atmosphere;
the conditions of the pre-cracking are as follows: the pre-cracking temperature is 150-300 ℃, and the pre-cracking time is 30-50min; the cracking conditions are as follows: the cracking temperature is 550-700 ℃, and the cracking time is 30-70min;
(4) And (4) carrying out secondary ultrasonic treatment on the product obtained in the step (3), wherein the secondary ultrasonic intensity is 0.3-0.4W/mL, and the secondary ultrasonic time is 7-15min, so as to obtain the dried powdery sludge.
The dried powdery sludge treated by the method can be further treated according to needs, such as extraction, can be directly used in the fields of cement bricks and the like according to the industry requirement standard, and can be subjected to conventional landfill.
The present invention will be described in detail below by way of examples. In the following examples, the starting materials are all commercially available products unless otherwise specified; wherein, the raw materials are: organic sludge (sludge from refining enterprises with water content of 70 wt%), polyaluminum ferric chloride (from filter material industry Co., ltd., hippon, japan), and polyaluminum chloride (from environmental protection technologies Co., ltd., hongze, henan). In the following examples, the water content of sludge was measured by the method of GB/T25031-2010. The weight loss calculation method comprises the following steps: (weight of organic sludge raw material-weight of dried powdery sludge)/weight of organic sludge raw material.
Example 1
This example is for explaining the organic sludge treatment method of the present invention.
(1) Adding 10wt% of hydrochloric acid into an organic sludge raw material with the water content of 70wt%, adjusting the pH value to 7, adding polyaluminum ferric chloride, mixing, and carrying out polymerization under stirring of 1.6m/s for 40min, wherein the dosage of the polymerization agent is 120mg/L relative to the organic sludge raw material, so as to obtain a polymerization product;
(2) Carrying out primary ultrasonic treatment on the polymerization product, wherein the primary ultrasonic intensity is 0.15W/mL, and the primary ultrasonic time is 15min;
(3) Sequentially carrying out pre-cracking and cracking on the product obtained in the step (2) in an oxygen-free atmosphere;
the conditions of the pre-cracking are as follows: the pre-cracking temperature is 200 ℃, and the pre-cracking time is 40min; the cracking conditions are as follows: the cracking temperature is 650 ℃, and the cracking time is 30min;
(4) And (4) carrying out secondary ultrasonic treatment on the product obtained in the step (3), wherein the secondary ultrasonic intensity is 0.3W/mL, and the secondary ultrasonic time is 10min, so as to obtain the dried powdery sludge.
The water content and weight loss of the dried powdery sludge were measured and shown in table 1.
Example 2
The procedure is as in example 1, except that polyaluminum chloride is used instead of polyaluminum ferric chloride, and the corresponding tests are carried out.
Examples 3 to 4
The procedure of example 1 was followed and the corresponding tests were carried out, except that the treatment parameters shown in Table 1 were used.
Comparative example 1
(1) Adding 10wt% of hydrochloric acid into an organic sludge raw material with the water content of 70wt%, adjusting the pH value to 7, adding polyaluminum ferric chloride, mixing, and carrying out polymerization under stirring of 1.6m/s for 40min, wherein the dosage of the polymerization agent is 120mg/L relative to the organic sludge raw material, so as to obtain a polymerization product;
(2) Carrying out primary ultrasonic treatment on the polymerization product, wherein the primary ultrasonic intensity is 0.15W/mL, and the primary ultrasonic time is 15min;
(3) Sequentially carrying out pre-cracking and cracking on the product obtained in the step (2) in an oxygen-free atmosphere;
the conditions of the pre-cracking are as follows: the pre-cracking temperature is 200 ℃, and the pre-cracking time is 40min; the cracking conditions are as follows: the cracking temperature is 650 ℃, and the cracking time is 30min; and obtaining the dried powdery sludge.
The water content and weight loss of the dried powdery sludge were measured as shown in Table 1.
Comparative example 2
The procedure of example 1 was followed and the corresponding tests were carried out, except that the treatment parameters shown in Table 1 were used.
TABLE 1
As can be seen from the results of table 1, the examples according to the present invention have significantly better effects.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (2)
1. The organic sludge treatment method is characterized by comprising the following steps:
(1) Adding an acid-base regulator into an organic sludge raw material, regulating the pH value to be 7, adding a polymerization agent, mixing, and polymerizing, wherein the dosage of the polymerization agent is 120mg/L relative to the organic sludge raw material, the polymerization time is 40min, the polymerization is carried out under stirring, and the stirring speed is 1.6m/s, so as to obtain a polymerization product; the polymerization agent is polyaluminum ferric chloride; the water content of the organic sludge raw material is more than 60 wt%;
(2) Carrying out primary ultrasonic treatment on the polymerization product, wherein the primary ultrasonic intensity is 0.15W/mL, and the primary ultrasonic time is 15min;
(3) Sequentially carrying out pre-cracking and cracking on the product obtained in the step (2) in an oxygen-free atmosphere, wherein the pre-cracking temperature is 200 ℃, and the pre-cracking time is 40min; the cracking temperature is 650 ℃, and the cracking time is 30min;
(4) And (4) carrying out secondary ultrasonic treatment on the product obtained in the step (3), wherein the secondary ultrasonic intensity is 0.3W/mL, and the secondary ultrasonic time is 10min, so as to obtain the dried powdery sludge.
2. The method according to claim 1, wherein the pH modifier in step (1) is hydrochloric acid or sodium hydroxide solution.
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| CN202010423110.4A CN111517607B (en) | 2020-05-18 | 2020-05-18 | Organic sludge treatment method |
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