CN110981158A - Papermaking sludge conditioning agent and application thereof - Google Patents
Papermaking sludge conditioning agent and application thereof Download PDFInfo
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- CN110981158A CN110981158A CN201911404554.7A CN201911404554A CN110981158A CN 110981158 A CN110981158 A CN 110981158A CN 201911404554 A CN201911404554 A CN 201911404554A CN 110981158 A CN110981158 A CN 110981158A
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- sludge
- ferrate
- conditioning agent
- wood chip
- papermaking sludge
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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
-
- 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
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
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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)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to the technical field of treatment of papermaking sludge, in particular to a papermaking sludge conditioning agent and application thereof.
Description
Technical Field
The invention relates to the technical field of treatment of papermaking sludge, and particularly relates to a papermaking sludge conditioning agent and application thereof.
Background
The main treatment modes of the paper-making sludge are incineration treatment, biological treatment and land utilization of the sludge. The sludge incineration can effectively solve the outlet problem of the sludge, fully utilize energy in the sludge, and the sludge does not need to be treated by killing pathogenic bacteria, but the sludge incineration needs to ensure that the sludge has lower water content, so the dehydration degree of the sludge needs to be improved.
However, since sludge contains highly hydrophilic sludge colloidal particles and extracellular polymers, the sludge is easily deformed when being pressed, and it is difficult to improve the dehydration efficiency of sludge by a mechanical method, and the dehydrated sludge cake has a large amount and a high water content. Due to the high water content in the sludge, the solid content is relatively low, the corresponding organic matter content is low, the combustion heat value is low, and a large amount of energy is consumed for evaporating water when the sludge is directly incinerated. Therefore, the water content of the sludge cake is reduced, the heat value is improved, and the sludge incineration recovery heat value becomes a key direction of the current sludge resource utilization.
Disclosure of Invention
Aiming at the problems of difficult dehydration and low combustion heat value of the paper-making sludge and difficult incineration in the prior art, the invention provides a paper-making sludge conditioning agent, which takes sawdust powder as a framework construction body and can obviously improve the dehydration effect of the sludge by oxidation compounding with ferrate.
The invention provides a papermaking sludge conditioning agent, which comprises ferrate and wood chip powder;
wherein the ferrate is sodium ferrate or potassium ferrate; the wood chip powder is poplar wood chip powder or pine wood chip powder;
when the agent is used, the addition amount of the ferrate is 40-60 mg/g, the addition amount of the wood chip powder is 400-500 mg/g and the addition amount of the ferrate is calculated by the mass of iron ions based on the dry basis of the papermaking sludge.
Preferably, the ferrate is sodium ferrate; the wood chip powder is pine wood chip powder.
Preferably, the addition amount of the ferrate is 40mg/g, the addition amount of the wood chip powder is 500mg/g, and the addition amount of the ferrate is calculated by the mass of iron ions.
Preferably, the particle size of the wood dust is less than 0.08 mm.
The papermaking sludge conditioning agent provided by the invention can be used for dehydration treatment of papermaking sludge, and the specific use process is as follows: adding the ferrate into the paper-making sludge under the stirring action, and carrying out mixed reaction for 10-30 min; and adding the wood dust, mixing and reacting for 1-5 min, and standing the obtained sludge mixture.
The invention provides a papermaking sludge conditioning agent, wherein ferrate used is hexavalent ferric salt, and the ferrate is hexavalent ferric saltThe sludge flocculant has strong oxidizability, can generate oxidation with various substances in the sludge, destroys the sludge floc structure, releases the water entrapped in the sludge and is beneficial to sludge dehydration; meanwhile, the strong oxidizing property of the ferrate can effectively kill microorganisms in water, and the ferrate has excellent oxidizing bleaching, sterilizing and deodorizing effects; in addition, ferrate is reduced into nascent Fe after participating in the reaction3+，Fe3+The flocculant has the functions of flocculation, adsorption, coprecipitation and the like, is an inorganic flocculant with excellent quality, and can efficiently remove suspended matters and colloids in water; the strong oxidation and flocculation of ferrate is more beneficial to sludge-water separation of sludge; the sawdust powder is mainly used as a framework construction body, and after the sawdust powder is further added, the sawdust powder and the sludge form a certain rigid framework structure through electrostatic crosslinking, so that the filtering speed of the sludge is accelerated; and the addition of the wood chip powder realizes the resource utilization of forestry waste wood chips, increases the organic matter content of sludge, greatly improves the heat value when the dewatered sludge is used for incineration or coal-doped incineration, and realizes energy recovery while the sludge and the waste wood chips are subjected to resource treatment.
The invention utilizes FeO4 2-Oxidative hydrolysis to Fe3+The chemical equation is as follows:
FeO4 2-+4H2O+3e－→Fe3++5OH－E0＝+0.72V (1)
compared with the prior art, the invention has the beneficial effects that:
1) according to the invention, sodium ferrate and wood dust are used for dehydration treatment of paper-making sludge for the first time, the strong oxidation effect of ferrate can destroy extracellular polymeric structures, disperse sludge flocs, release bound water in sludge floc grids and facilitate deep dehydration of water in sludge; meanwhile, the sludge floc can be more fully combined with the sawdust powder by dispersing the sludge floc, so that the time and energy consumption in the stirring process are reduced, the formation of an internal channel of the framework construction body is facilitated, the stress is transferred to the inside of the sludge floc in the mechanical dehydration process, and a free water outflow channel is further provided, so that the synergistic effect of improving the dehydration efficiency is achieved;
2) the method provided by the invention can use the existing forming process for reference when in use, has no special requirements on equipment, is simple to operate and low in cost, and is beneficial to industrial popularization.
Detailed Description
The embodiments of the present invention will be specifically described below by way of examples, which are intended to illustrate the present invention without further limiting the invention.
Example 1
A papermaking sludge conditioning agent comprises sodium ferrate and pine wood chip powder, and can be used for dewatering papermaking sludge, and the specific process comprises the following steps:
under the stirring action, adding 40mg/g of sodium ferrate into the sludge according to the dry basis of the sludge, and carrying out mixed reaction for 10min, wherein the adding amount of the sodium ferrate is calculated according to the mass of iron ions; and adding 400mg/g pine wood chip powder according to the mass of the dry sludge basis, mixing for 1min, and standing the obtained sludge mixture.
Example 2
A papermaking sludge conditioning agent comprises potassium ferrate and pine wood chip powder, and can be used for dehydrating papermaking sludge, and the specific process comprises the following steps:
under the stirring action, adding 60mg/g potassium ferrate into the sludge according to the dry basis of the sludge, and carrying out mixed reaction for 30min, wherein the adding amount of the potassium ferrate is calculated according to the mass of iron ions; and then adding 500mg/g pine wood chip powder according to the mass of the dry sludge basis, mixing for 5min, and standing the obtained sludge mixture.
Example 3
A papermaking sludge conditioning agent comprises sodium ferrate and poplar wood chip powder, and can be used for dehydrating papermaking sludge, and the specific process comprises the following steps:
under the stirring action, adding 50mg/g of sodium ferrate into the sludge according to the dry basis of the sludge, and carrying out mixed reaction for 20min, wherein the adding amount of the sodium ferrate is calculated according to the mass of iron ions; and then adding 450mg/g poplar wood chip powder according to the mass of the dry sludge basis, mixing for 3min, and standing the obtained sludge mixture.
Example 4
A papermaking sludge conditioning agent comprises potassium ferrate and poplar wood chip powder, and can be used for dehydrating papermaking sludge, and the specific process comprises the following steps:
under the stirring action, adding 40mg/g potassium ferrate into the sludge according to the dry basis of the sludge, and carrying out mixed reaction for 20min, wherein the adding amount of the potassium ferrate is calculated according to the mass of iron ions; and then adding 500mg/g poplar wood chip powder according to the mass of the dry sludge basis, mixing for 5min, and standing the obtained sludge mixture.
Comparative example 1
A papermaking sludge conditioning agent is sodium ferrate, and the specific process of using the conditioning agent to dewater papermaking sludge comprises the following steps:
under the stirring action, adding 20mg/g of sodium ferrate into the sludge according to the dry basis of the sludge, carrying out mixing reaction for 20min, and then standing for treatment, wherein the adding amount of the sodium ferrate is calculated according to the mass of iron ions.
Comparative example 2
A papermaking sludge conditioning agent is sodium ferrate, and the specific process of using the conditioning agent to dewater papermaking sludge comprises the following steps:
under the stirring action, adding 40mg/g of sodium ferrate into the sludge according to the dry basis of the sludge, carrying out mixing reaction for 20min, and then standing for treatment, wherein the adding amount of the sodium ferrate is calculated according to the mass of iron ions.
Comparative example 3
A papermaking sludge conditioning agent is potassium ferrate, and the specific process of using the conditioning agent to dewater papermaking sludge comprises the following steps:
under the stirring action, 60mg/g potassium ferrate is added into the sludge according to the dry basis of the sludge, the mixture is subjected to standing treatment after 20min of mixing reaction, and the addition amount of the potassium ferrate is calculated according to the mass of iron ions.
Comparative example 4
A papermaking sludge conditioning agent is pine wood chip powder, and the specific process of using the conditioning agent to dewater papermaking sludge is as follows:
adding 500mg/g pine wood chip powder under the stirring action according to the mass of a dry sludge basis, mixing for 5min, and standing the obtained sludge mixture.
Comparative example 5
A conditioning agent for paper-making sludge is prepared from CaO and FeCl3The conditioning agent is used for dehydrating papermaking sludge, and the specific process comprises the following steps:
under the stirring action, adding 300mg/gCaO into the sludge on a dry basis of the sludge, carrying out mixing reaction for 20min, and then standing for treatment, wherein the addition amount of calcium oxide is calculated by the mass of calcium ions; then 1mg/gFeCl is added according to the mass measurement of the sludge dry basis3And mixing for 5min, standing the obtained sludge mixture, and adding the ferric chloride according to the mass of iron ions.
Comparative example 6
A conditioning agent for papermaking sludge consists of CaO and polyaluminium chloride (PAC), and the specific process of using the conditioning agent to dewater the papermaking sludge comprises the following steps:
under the stirring action, adding 300mg/g CaO into the sludge on a dry basis of the sludge, carrying out mixing reaction for 20min, and then standing for treatment, wherein the addition amount of the sodium ferrate is calculated by the mass of iron ions; and then 3mg/gPAC is added according to the mass of the dry sludge basis, the mixture is mixed for 5min, and the obtained sludge mixture is subjected to standing treatment.
The dewatering effect of the papermaking sludge conditioning agent provided in each example and each comparative example was evaluated as follows.
The sludge comes from the city of dancing steels, the expected paperboard sewage treatment plants, the basic physicochemical properties of the raw sludge are tested according to the sludge inspection method of the city sewage treatment plants (CJ/T221-2005), and as shown in Table 1, the experimental results are the average values of three parallel experiments, wherein SRF represents the specific resistance of the sludge and is used for representing the difficulty degree of sludge dewatering.
TABLE 1 basic characteristics of raw sludge
| Item | Water content (%) | Organic matter (%) | Sludge lower calorific value (kJ/kg) | Sludge specific resistance (10)7s2·g-1) |
| Index (I) | 92 | 29.15 | 558 | 5.15 |
The effect of sludge treatment is shown in Table 2.
TABLE 2 sludge dewatering effect of each example and each comparative example
As can be seen from table 2: after the papermaking sludge conditioning agent provided by the invention is adopted to dehydrate sludge, the water content is reduced, the organic matter content of the sludge is increased by about 100%, the combustion heat value is obviously increased, the subsequent resource incineration treatment is facilitated, the heat value is recovered while the sludge disposal problem is solved, and the benefit is increased.
It should be noted that when the following claims refer to numerical ranges, it should be understood that both ends of each numerical range and any value between the two ends can be selected, and since the steps and methods used are the same as those of the embodiments, the preferred embodiments of the present invention have been described for the purpose of preventing redundancy, but once the basic inventive concept is known, those skilled in the art may make other variations and modifications to the embodiments. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. The papermaking sludge conditioning agent is characterized by comprising ferrate and wood chip powder;
wherein the ferrate is sodium ferrate or potassium ferrate; the wood chip powder is poplar wood chip powder or pine wood chip powder;
when the agent is used, the addition amount of the ferrate is 40-60 mg/g, the addition amount of the wood chip powder is 400-500 mg/g and the addition amount of the ferrate is calculated by the mass of iron ions based on the dry basis of the papermaking sludge.
2. The papermaking sludge conditioning agent according to claim 1, wherein the ferrate is sodium ferrate; the wood chip powder is pine wood chip powder.
3. The papermaking sludge conditioning agent according to claim 1, wherein the ferrate is added in an amount of 40mg/g, the sawdust powder is added in an amount of 500mg/g, and the ferrate is added in an amount based on the mass of iron ions.
4. The papermaking sludge conditioning agent according to claim 1, wherein the particle size of the wood dust is less than 0.08 mm.
5. Use of a papermaking sludge conditioning agent according to any one of claims 1 to 4 in a dewatering treatment of papermaking sludge.
6. The application of claim 5, wherein the specific use process is as follows: adding the ferrate into the paper-making sludge under the stirring action, and carrying out mixed reaction for 10-30 min; and adding the wood dust, mixing and reacting for 1-5 min, and standing the obtained sludge mixture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911404554.7A CN110981158A (en) | 2019-12-31 | 2019-12-31 | Papermaking sludge conditioning agent and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911404554.7A CN110981158A (en) | 2019-12-31 | 2019-12-31 | Papermaking sludge conditioning agent and application thereof |
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| Publication Number | Publication Date |
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| CN110981158A true CN110981158A (en) | 2020-04-10 |
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| CN201911404554.7A Pending CN110981158A (en) | 2019-12-31 | 2019-12-31 | Papermaking sludge conditioning agent and application thereof |
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Citations (5)
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|---|---|---|---|---|
| KR20090078702A (en) * | 2008-01-15 | 2009-07-20 | 정맥산업개발(주) | Solidification agent and solidification method for sludge containing water |
| CN105800893A (en) * | 2016-05-17 | 2016-07-27 | 上海电力学院 | Sludge reduction system using potassium ferrate oxidation and application thereof |
| CN108931563A (en) * | 2018-05-02 | 2018-12-04 | 华中科技大学 | The method for aoxidizing conditioning dewatering performance of sludge based on oxidation-reduction potential Fast Evaluation |
| CN109336361A (en) * | 2018-12-26 | 2019-02-15 | 肇庆市珈旺环境技术研究院 | A kind of sludge conditioning medicament and its application |
| CN110204174A (en) * | 2019-06-26 | 2019-09-06 | 河北工业大学 | A method of conditioning sludge dewatering |
-
2019
- 2019-12-31 CN CN201911404554.7A patent/CN110981158A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090078702A (en) * | 2008-01-15 | 2009-07-20 | 정맥산업개발(주) | Solidification agent and solidification method for sludge containing water |
| CN105800893A (en) * | 2016-05-17 | 2016-07-27 | 上海电力学院 | Sludge reduction system using potassium ferrate oxidation and application thereof |
| CN108931563A (en) * | 2018-05-02 | 2018-12-04 | 华中科技大学 | The method for aoxidizing conditioning dewatering performance of sludge based on oxidation-reduction potential Fast Evaluation |
| CN109336361A (en) * | 2018-12-26 | 2019-02-15 | 肇庆市珈旺环境技术研究院 | A kind of sludge conditioning medicament and its application |
| CN110204174A (en) * | 2019-06-26 | 2019-09-06 | 河北工业大学 | A method of conditioning sludge dewatering |
Non-Patent Citations (1)
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