CN109095751B - Method for treating activated sludge through lower-temperature thermokalite decomposition - Google Patents
Method for treating activated sludge through lower-temperature thermokalite decomposition Download PDFInfo
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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
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
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Abstract
The invention discloses a method for treating activated sludge through thermal-alkali decomposition at a lower temperature, which comprises the steps of adding strong base into the activated sludge step by step at the low temperature for hydrolysis reaction, then adding calcium oxide or calcium hydroxide for reaction, and finally carrying out solid-liquid separation to obtain filtrate and filter residue. The invention can make harmless, quantitative reduction and resource utilization of the activated sludge, completely inactivate pathogenic bacteria through thermokalite action, reduce the water content of the sludge from more than 80 percent to below 40 percent through solid-liquid separation after hydrolysis, and reduce the sludge by two thirds. In addition, the residue contains rich organic matters and calcium elements and can be used for preparing organic fertilizers, bio-organic fertilizers, microbial agents, landscaping soil and soil conditioners. The filtrate can be used for preparing organic water-soluble fertilizer.
Description
Technical Field
The invention belongs to the technical field of sludge treatment, and particularly relates to a method for treating activated sludge through lower-temperature thermokalite decomposition.
Background
With the continuous promotion of the urbanization process, the urban sludge yield is increased year by year, the yield is estimated to reach 5000 million tons in 2020 year, the phenomenon of 'heavy water and light pollution' in China is very serious at present, a large amount of sludge is not subjected to stabilization treatment, and great potential safety hazards are brought to water sources, atmosphere, land and human health. The sludge is a solid precipitate generated in the sewage treatment process, and due to various sewage types, the components of the sludge are complex and comprise components such as silt, fibers, microbial residues, organic matters, nutrient sources such as nitrogen and phosphorus, heavy metals, pathogenic bacteria and the like. The random discharge and accumulation of sludge has been associated with a surprise to new environmental pollution.
On the basis of sludge reduction and harmless treatment, how to utilize resources in sludge is a direction and a target pursued by countries all over the world and is bound to be a unique final outlet of sludge. The conventional sludge pyrohydrolysis is mainly used for carrying out reduction pretreatment on sludge, the hydrolyzed product cannot be directly subjected to solid-liquid separation, the purposes of reduction and resource utilization can be achieved by means of anaerobic digestion and the like, and the other process mode is that alkaline solid substances such as sodium hydroxide, quicklime and the like are added into the sludge at one time in the sludge pyrohydrolysis process to accelerate the sludge pyrohydrolysis rate, the adding mode of the alkaline substance easily causes excessive decomposition of organic matters in the sludge, resources can not be utilized secondarily, in addition, the hydrolysis temperature of the technical process is carried out at 100-180 ℃, the sludge inevitably generates water vapor at the high temperature, so that a large amount of high-pressure equipment is required in the hydrolysis process, and the sludge treatment cost is increased virtually.
Disclosure of Invention
In view of the above, the present invention provides a method for treating activated sludge by thermal alkali decomposition at a lower temperature, wherein organic matters and nitrogen resources in sludge are recycled after the sludge is subjected to harmless, reduction and recycling treatments. In addition, the organic nitrogen liquid resource extracted from the sludge can be used for preparing high-efficiency liquid fertilizer, the solid residue can be used for preparing soil conditioner or landscaping soil, and the sludge full-resource zero-emission treatment is realized in a high-efficiency and safe manner on the whole.
In order to achieve the purpose, the invention provides the following technical scheme: a method for treating activated sludge through thermal-alkaline decomposition at a lower temperature comprises the steps of adding strong base into the activated sludge step by step at a temperature of 70-90 ℃ for hydrolysis reaction, then adding calcium oxide or calcium hydroxide for reaction, and finally carrying out solid-liquid separation to obtain filtrate and filter residue.
Further, the strong base is added into the activated sludge twice, and the mass ratio of the addition amount of the strong base for the first time to the addition amount of the strong base for the second time is 0.625-3.75: 1.
further, OH in the first addition of strong base-The addition amount of the (B) is 0.425-1.275% of the dry basis weight of the sludge, and OH in the strong alkali added for the second time-The addition amount of the sludge is 0.34-0.68% of the dry basis weight of the sludge.
Further, the first hydrolysis reaction is carried out for 1-2h at 70-80 ℃, and the second hydrolysis reaction is carried out for 1-2h at 80-90 ℃.
Further, the strong base may be sodium hydroxide or potassium hydroxide.
Further, the strong base is sodium hydroxide, the adding amount of the first sodium hydroxide is 1-3% of the dry basis weight of the sludge, and the adding amount of the second sodium hydroxide is 0.8-1.6% of the dry basis weight of the sludge.
Furthermore, the total adding amount of the first sodium hydroxide and the second sodium hydroxide is 2.2-3.4% of the dry basis weight of the sludge, and the adding amount ratio of the first sodium hydroxide to the second sodium hydroxide is 0.8-2: 1.
Furthermore, the addition amount of the calcium oxide is 15-30% of the dry basis weight of the sludge, and the calcium oxide and the hydrolysate react for 0.5-1h at the temperature of 80-90 ℃.
Further, the filtrate can be used for preparing water-soluble fertilizers.
Further, the filter residue can be used for preparing organic fertilizers, microbial agents, landscaping soil or soil conditioners.
Compared with the prior art, the invention has the beneficial effects that:
(1) the final purpose of the sludge treatment in the invention is to recycle organic matters and nitrogen resources in the sludge while reducing the sludge. According to the invention, the alkaline saturated solution of sodium hydroxide is added in two steps, and the addition amount of the saturated solution of sodium hydroxide in the first step and the addition amount of the saturated solution of sodium hydroxide in the second step are strictly controlled, so that resources in sludge are utilized to the maximum extent. The sodium hydroxide saturated solution is added for the first time, which mainly destroys a colloidal structure of sludge cells, accelerates a wall breaking process of microbial cell walls in activated sludge, accelerates the release of water in the sludge cell walls, and simultaneously consumes and dilutes sodium hydroxide, so that organic matters in the activated sludge cannot be excessively hydrolyzed by the sodium hydroxide, and the sodium hydroxide saturated solution is added for the second time, which aims at hydrolyzing the organic matters, compensating the consumption of the sodium hydroxide added for the first time and maintaining the effective concentration of the sodium hydroxide required by the degradation of the organic matters.
(2) The calcium oxide medicament adopted by the invention provides sufficient calcium ions, the calcium ions have an important effect on the formation of filter cakes in the sludge filtration process, and the dosage of the calcium ions is very important. In addition, calcium ions are important medium elements required by plants, and the addition of the calcium ions enables sludge residues to have an excellent soil conditioning function and can supplement elements lacking in the plants.
(3) The invention can make harmless, quantitative reduction and resource utilization of the activated sludge, inactivate pathogenic bacteria through strong alkali, reduce the water content of the sludge from more than 80 percent to below 40 percent through solid-liquid separation after hydrolysis, and reduce the sludge by two thirds. In addition, the residue contains rich organic matters and calcium elements, and can be used for preparing organic fertilizers, bio-organic fertilizers, microbial agents, landscaping soil and soil conditioners, and the filtrate can be used for preparing organic water-soluble fertilizers.
(4) Compared with other sludge hydrolysis processes, the method has the advantages of low temperature, low energy consumption and the like, in addition, pressure container equipment is not required to be arranged in the whole process, the cost is reduced by 30-50%, and the operation safety is also improved.
Detailed Description
To further illustrate the contents, features and effects of the present invention, the present invention will be further described by way of the following examples. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
The present invention is further illustrated in detail by the following examples and comparative groups:
the physicochemical properties of the activated sludge are as follows:
| index of experiment | Mean value of | Standard deviation of |
| Water content (%) | 78 | ±7 |
| pH | 7 | ±0.5 |
| Organic matter content (dry basis%) | 50 | ±20 |
| Protein content (dry basis%) | 28 | ±12 |
Test 1: the influence of the relationship between the addition amounts of the first and second sodium hydroxide on the test results was verified
A method for treating activated sludge through lower-temperature thermal alkali decomposition comprises the following steps:
(1) adding water into activated sludge with the water content of 70-85% of that of the urban sewage treatment plant to adjust the water content of the sludge to 85% -92%;
(2) preparing a solid medicament sodium hydroxide into a sodium hydroxide saturated solution, adding the sodium hydroxide saturated solution into the sludge, uniformly stirring, uniformly mixing, wherein the addition amount of the sodium hydroxide is X% of the dry basis weight of the added sludge, and heating to 70 ℃ to perform hydrolysis reaction for 1 h;
(3) after the first hydrolysis reaction, adding a certain amount of sodium hydroxide medicament saturated solution again, feeding the solution into a hydrolysis reactor, wherein the addition amount of sodium hydroxide is Y% of the dry basis weight of the added sludge, and heating to 80 ℃ to perform hydrolysis reaction for 1 h;
(4) and (3) after the hydrolysis reaction in the step 2 is finished, preparing calcium oxide into a water suspension, sending the water suspension into a hydrolysis reactor, and stirring at 90 ℃ for 0.5h, wherein the addition amount of the calcium oxide is 20% of the dry basis mass of the added sludge.
(5) And (4) feeding the uniformly mixed materials into a solid-liquid separation device, and performing solid-liquid separation to obtain filtrate and filter residues. The sludge residue after solid-liquid separation can be collected and conveyed to a processing workshop to be crushed and mixed with other organic materials to prepare organic fertilizer, biological organic fertilizer, microbial agent, landscaping soil and soil conditioner. And (3) taking part of the filtrate obtained by solid-liquid separation as ingredient water to be directly recycled to the sludge hydrolysis reaction device, simultaneously, allowing the other part of the filtrate to pass through an MVR evaporation device to obtain a concentrated filtrate containing 20-50% of organic substances, and automatically compounding the filtrate with nitrogen, phosphorus and potassium and other trace elements to prepare a liquid organic water-soluble fertilizer product. The condensed water obtained by evaporation can be recycled for the sludge hydrolysis reaction device for cyclic utilization.
The process steps of the examples and the control were as above, wherein the first sodium hydroxide addition (i.e., X) and the second sodium hydroxide addition (i.e., Y) are shown in the following table, and the low-temperature hot-alkali treatment activated sludge test was characterized by using the residue water content, the organic matter degradation rate, and the filtrate protein content:
the table above shows the first sodium hydroxide addition (X), the second sodium hydroxide addition (Y), the total sodium hydroxide addition (X + Y), the ratio of the first sodium hydroxide addition to the second sodium hydroxide addition (X/Y), and the characterization data of the treated sludge in experiments 1 to 26. The final purpose of sludge treatment in the invention is to recycle organic matters and nitrogen resources in sludge on the basis of sludge reduction, and the invention can accelerate the wall breaking process of microorganism cell walls in activated sludge by adding sodium hydroxide lye, accelerate the release of water in the sludge cell walls, and promote the decomposition of organic matters to decompose protein matters into polypeptide and amino acid, but when the addition amount of the sodium hydroxide lye is excessive, the organic matters are decomposed into carbon dioxide, the protein matters are decomposed into ammonia gas, and the resources can not be effectively utilized, so the addition amount of sodium hydroxide is very important. In addition, if the amount of the sludge is too much, the sludge cannot be dried and formed, and resources cannot be effectively utilized. The method represents the effect of alkali treatment on the activated sludge by using the water content of the treated sludge residue, the degradation rate of organic matters and the protein content of filtrate, wherein the water content of the sludge residue is less than 40 percent, preferably less than 35 percent; the degradation rate of the organic matter is within the range of 40-60%, preferably 50%; the protein content of the filtrate is in the range of 2-3%, preferably 3%.
In the above-described experimental results of experiments 1 to 26, when the total addition amount of the first sodium hydroxide and the second sodium hydroxide is in the range of 2.2 to 3.4% and the ratio of the addition amounts of the first sodium hydroxide and the second sodium hydroxide is in the range of 0.8 to 2:1, the sludge residue water content, the organic matter degradation rate, and the filtrate protein content are all in the above-described ranges. In addition, the test effect of the first addition amount of sodium hydroxide being larger than the second addition amount of sodium hydroxide is better than the test effect of the second addition amount of sodium hydroxide being larger than the first addition amount of sodium hydroxide, such as experiment 8 and experiment 9, experiment 10 and experiment 11. In addition, it was unexpectedly found during the test that when the first sodium hydroxide addition was 1.5 and the second sodium hydroxide addition was 1.2, i.e., the process conditions of experiment 11, the test results reached the optimum values, i.e., the sludge residue water content was 35%, the organic matter degradation rate was 50%, and the filtrate protein content was 3.0%.
In addition, the sodium hydroxide in the invention can be replaced by potassium hydroxide, if potassium hydroxide is used for replacing, the addition amount of the potassium hydroxide is ensured to provide hydroxide ions with the same amount as that of the sodium hydroxide, the addition of the potassium hydroxide can increase the cost of the alkaline medicament, but on the other hand, the direct potassium content in the filtrate after hydrolysis reduces the addition amount of potassium salt in the preparation process of the rear-end liquid fertilizer; the calcium oxide in the invention can also be replaced by calcium hydroxide, and if the calcium hydroxide is used for replacement, the calcium hydroxide is added in an amount which can provide the same amount of calcium ions as the calcium oxide.
Test 2: the influence of the sodium hydroxide addition mode and the addition sequence of the sodium hydroxide and the calcium oxide on the test result is verified
Control group 1: a method for treating activated sludge through lower-temperature thermal alkali decomposition comprises the following steps:
(1) adding water into activated sludge with the water content of 70-85% of that of the urban sewage treatment plant to adjust the water content of the sludge to 85% -92%;
(2) preparing a solid medicament sodium hydroxide into a sodium hydroxide saturated solution, adding the sodium hydroxide saturated solution into the sludge, uniformly stirring, heating to 70 ℃ for hydrolysis reaction for 1h, and heating to 80 ℃ for hydrolysis reaction for 1h, wherein the addition amount of the sodium hydroxide is 2.7% of the dry basis weight of the added sludge;
(3) after the hydrolysis reaction is finished, preparing calcium oxide into a water suspension, sending the water suspension into a hydrolysis reactor, and stirring for 0.5h at 90 ℃, wherein the addition amount of the calcium oxide is 20% of the dry basis mass of the added sludge.
(4) And (4) feeding the uniformly mixed materials into a solid-liquid separation device, and performing solid-liquid separation to obtain filtrate and filter residues.
Control group 2: a method for treating activated sludge through lower-temperature thermal alkali decomposition comprises the following steps:
(1) adding water into activated sludge with the water content of 70-85% of that of the urban sewage treatment plant to adjust the water content of the sludge to 85% -92%;
(2) mixing solid medicament calcium oxide into an aqueous suspension, adding the aqueous suspension into sludge, uniformly stirring, heating to 70 ℃ for hydrolysis reaction for 1h, and heating to 80 ℃ for hydrolysis reaction for 1h, wherein the addition amount of the calcium oxide is 20% of the dry basis weight of the added sludge;
(3) after the hydrolysis reaction is finished, preparing sodium hydroxide into a saturated solution, sending the saturated solution into a hydrolysis reactor, and stirring the saturated solution at 90 ℃ for 0.5h, wherein the addition amount of the sodium hydroxide is 2.7% of the dry basis mass of the added sludge.
(4) And (4) feeding the uniformly mixed materials into a solid-liquid separation device, and performing solid-liquid separation to obtain filtrate and filter residues.
Control group 3: a method for treating activated sludge through lower-temperature thermal alkali decomposition comprises the following steps:
(1) adding water into activated sludge with the water content of 70-85% of that of the urban sewage treatment plant to adjust the water content of the sludge to 85% -92%;
(2) the method comprises the steps of preparing a solid medicament calcium oxide into an aqueous suspension, adding the aqueous suspension into sludge, preparing sodium hydroxide into a saturated solution, sending the saturated solution into a hydrolysis reactor, and uniformly stirring, wherein the addition amount of calcium oxide is 20% of the dry basis mass of the added sludge, and the addition amount of sodium hydroxide is 2.7% of the dry basis mass of the added sludge. Heating to 70 ℃ for hydrolysis reaction for 1h, then heating to 80 ℃ for hydrolysis reaction for 1h, and then heating to 90 ℃ for reaction for 0.5 h.
(3) And (4) feeding the uniformly mixed materials into a solid-liquid separation device, and performing solid-liquid separation to obtain filtrate and filter residues.
Namely: the parameters of the control groups 1-3, such as the addition of sodium hydroxide and calcium oxide, are shown in the following table: wherein the addition amount is the mass percent of the sludge dry basis, the reaction temperature/DEG C and the reaction time/h.
The results of the control groups 1 to 3 for the treatment of activated sludge were as follows:
compared with experiment 11, the control group 1 has the advantages that the total adding amount of sodium hydroxide twice in the same experiment 11 is added into the activated sludge for treatment once, the water content of residues reaches 57%, the degradation rate of organic matters reaches 58%, and the result is obviously higher than that of the experiment 11, the protein content in filtrate is only 1.2%, and is obviously lower than that of the experiment 11, so that the excessive hydrolysis of the organic matters in the activated sludge can be avoided by adding the sodium hydroxide into the activated sludge in two batches, and the sludge treatment effect of adding the sodium hydroxide into the activated sludge in two batches is better than that of adding the sodium hydroxide once. In addition, the control group 2 is that calcium oxide is added into the activated sludge firstly, then sodium hydroxide is added, the control group 3 is that calcium oxide and sodium hydroxide are added into the activated sludge simultaneously, the water content of the residue and the degradation rate of organic matters in the experimental result are both higher than those in the experiment 11, and the protein content in the filtrate is obviously lower than that in the experimental result of the experiment 11, which shows that the order of sodium hydroxide and calcium oxide can not be reversed, and sodium hydroxide and calcium hydroxide can not be added simultaneously in the activated sludge treatment of the invention.
Test 3: the influence of the reaction temperature and the reaction time on the test results was verified
The test results are as follows:
the process steps of controls 4-7 and experiment 11 were identical except for the reaction temperature. Control 8-control 10 changed only the reaction time compared to experiment 11. The test results show that the differences of the residue water content, the organic matter degradation rate and the filtrate protein content of the control group 4-10 and the experiment 11 are not large, which indicates that the influence of the reaction temperature and the reaction time on the activated sludge treatment process is not large, namely, the first sodium hydroxide alkali decomposition temperature is 70-80 ℃ for reaction for 1-2h, the second sodium hydroxide alkali decomposition temperature is 80-90 ℃ for reaction for 1-2h, and the calcium oxide solid-liquid reaction temperature is 80-90 ℃ for reaction for 0.5-1h, so that better effects can be achieved.
Test 4: the influence of the addition amount of calcium oxide on the test result is verified
A method for treating activated sludge through lower-temperature thermal alkali decomposition comprises the following steps:
(1) adding water into activated sludge with the water content of 70-85% of that of the urban sewage treatment plant to adjust the water content of the sludge to 85% -92%;
(2) preparing a solid medicament sodium hydroxide into a sodium hydroxide saturated solution, adding the sodium hydroxide saturated solution into the sludge, uniformly stirring, uniformly mixing, wherein the addition amount of the sodium hydroxide is 1.5 percent of the dry basis weight of the added sludge, and heating to 70 ℃ to perform hydrolysis reaction for 1 hour;
(3) after the first hydrolysis reaction, adding a certain amount of sodium hydroxide medicament saturated solution again, feeding the solution into a hydrolysis reactor, wherein the addition amount of sodium hydroxide is 1.2% of the dry basis weight of the added sludge organic matter, and heating to 80 ℃ to perform hydrolysis reaction for 1 h;
(4) and (3) after the hydrolysis reaction in the step 2 is finished, preparing calcium oxide into a water suspension, sending the water suspension into a hydrolysis reactor, and stirring the water suspension for 0.5h at the temperature of 90 ℃, wherein the addition amount of the calcium oxide is C% of the dry basis mass of the added sludge.
(5) And (4) feeding the uniformly mixed materials into a solid-liquid separation device, and performing solid-liquid separation to obtain filtrate and filter residues. Wherein, the addition amount of calcium oxide and the experimental result are as follows:
| experimental number | Calcium oxide (C)/%) | Water content of residue/%) | Organic matter degradation rate/%) | The protein content of the filtrate/%) |
| Experiment 11 | 20 | 35 | 50 | 3.0 |
| Control group 11 | 2 | 72 | 35 | 1.5 |
| Control group 12 | 5 | 63 | 41 | 1.8 |
| Control group 13 | 8 | 57 | 43 | 2.0 |
| Control group 14 | 10 | 50 | 45 | 2.2 |
| Control group 15 | 15 | 40 | 48 | 2.6 |
| Control group 16 | 25 | 34 | 51 | 2.8 |
| Control group 17 | 30 | 33 | 53 | 2.5 |
| Control group 18 | 35 | 32 | 55 | 1.2 |
The calcium oxide medicament adopted by the invention provides sufficient calcium ions, the calcium ions have an important bridging effect on the formation of filter cakes in the sludge filtering process, and the excessive use amount of the calcium ions can cause that the water content of the filtered sludge cannot be reduced to below 40 percent, such as comparison groups 11,12,13 and 14; if the amount of the filtrate is more than the reference amount, the amount of the sludge residue at the rear end is increased, and the protein content of the filtrate is reduced, such as a reference group 18; when the addition amount of the calcium oxide is between 15 and 30 percent, the water content of the residue can be kept below 40 percent, and the degradation rate of organic matters can be kept between 40 and 60 percent. In addition, under the process conditions of experiment 11, the effect was best when the amount of calcium oxide added was 20%. In addition, calcium ions are important medium elements required by plants, and the addition of the calcium ions enables sludge residues to have an excellent soil conditioning function and can supplement elements lacking in the plants.
The embodiments of the present invention have been described in detail, but the description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention. Any modification, equivalent replacement or improvement made within the scope of the application of the present invention shall be included in the protection scope of the present invention.
Claims (8)
1. A method for treating activated sludge through lower-temperature thermokalite decomposition is characterized by comprising the following steps: adding strong base into the activated sludge step by step at 70-90 ℃ for hydrolysis reaction, then adding calcium oxide or calcium hydroxide for reaction, and finally carrying out solid-liquid separation to obtain filtrate and filter residue; the alkali is added into the activated sludge twice, and the mass ratio of the addition amount of the alkali for the first time to the addition amount of the alkali for the second time is 1.071-3.75: 1; OH in the first addition of strong base-The addition amount of the (B) is 0.425-1.275% of the dry basis weight of the sludge, and OH in the strong alkali added for the second time-The addition amount of the sludge is 0.34-0.68% of the dry basis weight of the sludge; and the firstThe secondary strong base is directly added into the primary reaction solution.
2. The method for treating activated sludge through lower temperature thermal alkaline decomposition according to claim 1, wherein the method comprises the following steps: the first hydrolysis reaction is carried out for 1-2h at 70-80 ℃, and the second hydrolysis reaction is carried out for 1-2h at 80-90 ℃.
3. The method for treating activated sludge through lower temperature thermal alkaline decomposition according to claim 1, wherein the method comprises the following steps: the strong base can be sodium hydroxide or potassium hydroxide.
4. The method for treating activated sludge through lower temperature thermal alkaline decomposition according to claim 3, wherein the method comprises the following steps: the strong base is sodium hydroxide, the adding amount of the first sodium hydroxide is 1-3% of the dry basis weight of the sludge, and the adding amount of the second sodium hydroxide is 0.8-1.6% of the dry basis weight of the sludge.
5. The method for treating activated sludge through lower temperature thermal alkaline decomposition according to claim 4, wherein the method comprises the following steps: the total adding amount of the first sodium hydroxide and the second sodium hydroxide is 2.2-3.4% of the dry basis weight of the sludge, and the adding amount ratio of the first sodium hydroxide to the second sodium hydroxide is 0.8-2: 1.
6. A method for treating activated sludge by lower temperature thermal alkaline decomposition according to one of claims 1 to 5, characterized in that: the addition amount of the calcium oxide is 15-30% of the dry basis weight of the sludge, and the calcium oxide and the hydrolysate react for 0.5-1h at the temperature of 80-90 ℃.
7. The method for treating activated sludge through lower temperature thermal alkaline decomposition according to claim 1, wherein the method comprises the following steps: the filtrate can be used for preparing water-soluble fertilizers.
8. The method for treating activated sludge through lower temperature thermal alkaline decomposition according to claim 1, wherein the method comprises the following steps: the filter residue can be used for preparing organic fertilizers, microbial agents, landscaping soil or soil conditioners.
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| CN114772886A (en) * | 2022-03-23 | 2022-07-22 | 东华工程科技股份有限公司 | Method for full-scale denitrification and denitrification of excess sludge |
| CN115215703A (en) * | 2022-07-28 | 2022-10-21 | 无锡国联环保科技股份有限公司 | Soil conditioner based on dried sludge and preparation method thereof |
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| CN109095751A (en) | 2018-12-28 |
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