WO2018120342A1 - 一种用于污泥深度脱水的化学调理剂投加量优化方法 - Google Patents

一种用于污泥深度脱水的化学调理剂投加量优化方法 Download PDF

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WO2018120342A1
WO2018120342A1 PCT/CN2017/071691 CN2017071691W WO2018120342A1 WO 2018120342 A1 WO2018120342 A1 WO 2018120342A1 CN 2017071691 W CN2017071691 W CN 2017071691W WO 2018120342 A1 WO2018120342 A1 WO 2018120342A1
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sludge
conditioning agent
dosage
chemical
organic matter
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French (fr)
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杨家宽
虞文波
陶爽奕
梁莎
时亚飞
胡敬平
侯慧杰
关若楠
吕阳
李宏森
喻江维
胡少刚
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Huazhong University of Science and Technology
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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
    • C02F11/06—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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
    • 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
    • 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
    • C02F11/12—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
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
    • 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
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/02—Specific form of oxidant
    • C02F2305/026—Fenton's reagent

Definitions

  • the invention belongs to the technical field of sludge treatment of urban sewage treatment plants, and more particularly to a chemical conditioning agent dosage method for deep dewatering of sludge, which is a chemical method for destroying organic floc structure of sludge
  • the dosage of the conditioning agent is optimized and controlled to deeply dewater the sludge (ie, the dewatered sludge has a moisture content of less than 60%), which is suitable for the treatment and disposal of municipal sludge, and is suitable for The treatment of deep dewatering reduction of the front sludge.
  • Municipal sludge which is the general term for the primary sludge and excess sludge produced in the municipal sewage treatment plant activated sludge process.
  • Municipal sludge contains high organic matter, and the sludge floc contains a large amount of hydrophilic extracellular polymer (EPS), resulting in high combined water content, making it difficult to separate mud and water.
  • EPS hydrophilic extracellular polymer
  • the sludge has high water content, large volume, large changes in organic matter content, and deep dewatering of sludge is the bottleneck of sludge treatment and disposal.
  • urban sewage treatment plants are generally treated with high-molecular flocculants (such as PAM), and then dehydrated by high-speed centrifuge or belt filter press. Only mud cake with a moisture content of about 80% can be obtained, and it is difficult to achieve the pollution of urban sewage treatment plants.
  • the requirements for the mixed landfill in the mud disposal muddy mixed landfill (GB/T 23485-2009) (sludge moisture content ⁇ 60%). Therefore, it is necessary to carry out deep dewatering of the sludge (the moisture content of the sludge is reduced to less than 60%), so that the de-cement cake can meet the requirements of subsequent treatment and disposal.
  • EPS hydrophilic sludge floc structure (including a large amount of combined water) formed by sludge EPS is an important reason for sludge dewatering.
  • EPS is a major component of sludge organic matter, selected by suction The function of accepting and ionizing the functional group can adsorb and absorb water, and the highly hydrophilic effect exhibited is unfavorable for sludge dewatering.
  • the high organic matter content of sludge is also an important factor restricting the degree of sludge dewatering. Since the organic matter is easily compressed and deformed under the action of mechanical high pressure, the pores of the filter cake are blocked at the later stage of filtration, that is, the filtration passage of the water is blocked, resulting in low dewatering efficiency at present.
  • the general physical conditioning is difficult to solve the problem of the removal of void water and capillary water, and has the disadvantages of high operating cost and large equipment investment.
  • sludge chemical conditioning agent dosage is based on dry-based sludge (mg/g DS, or %DS) (for example, the free-produced products, sulfides and industrial by-product gypsum in Chinese patent CN 104649533 A
  • the dosage method is 1 to 10%, 1 to 10%, and 10 to 40%, respectively, of the dry weight of the sludge, and the dosage of the dehydrated desiccant in the US patent US 4,870,022 A is at least 10% of the sludge dry basis. ).
  • sludge volume (% by volume, or mg/L) (for example, the agent for concentrated agent A, concentrated agent B and concentrated agent C in Chinese patent CN 105800909 A).
  • the dosage of the agent is 1.0 to 10.0% (volume percent) of the total amount of the sludge, and the dosage of Fe 2+ and H 2 O 2 in the US patent US6368511 B1 is 1.125 to the total amount of the sludge, respectively. 6%, 1.5 to 8% (volume percent) are determined in units of measurement.
  • the above-mentioned conventional DS-based chemical conditioning agent dosage method (mg/g DS, or %DS) and sludge volume (mg/L) are conventional sludge treatment processes involving only free water removal in sludge. It has certain applicability, such as sludge sedimentation process, concentration process, sludge centrifugal dewatering, belt pressure filtration process and so on. However, the deep dewatering process involving the combined removal of water from the EPS organic macromolecules is poorly applicable.
  • the sludge organic matter content is closely related to the sludge source, season, rainfall and other factors.
  • the sludge content of the same sewage plant varies from 20% to 50% in different seasons.
  • the sludge produced by different wastewater treatment plants varies depending on the influent water quality and process.
  • the organic content also varies greatly.
  • the prior patented technology and the recommended dry-based sludge (mg/g DS) and sludge volume (mg/L) based dosing methods have a poor effect on deep dewatering of high organic matter sludge, but Sludge that is easily dehydrated and has a low organic content has too much dose of pesticides, resulting in waste of the medicament.
  • the EPS content which is an important factor affecting the dewatering performance of sludge, is an important component of the sludge organic matter content. Because the organic matter content in the sludge has a significant effect on the combined water, the control method of the usual sludge chemical conditioning agent dosage can not be adapted. Mud sludge changes with different organic content.
  • the optimized formula obtained by the pharmaceutical dosage method based on the dry sludge content and sludge volume calculation, the dosage of the chemical does not change with the change of the organic matter content of the sludge, thereby causing the traditional pharmaceutical dosage method to sludge the different organic matter content. Poor adaptability.
  • sludge depth dewatering cake moisture content target such as 60wt%, commonly used DS-based chemical conditioning agent dosage method (mg / g DS, or % DS)
  • DS-based chemical conditioning agent dosage method for higher organic content
  • the sludge is prone to fail to meet the designed moisture content of the mud cake; for sludge with lower organic content, it is prone to excessive dosage of the agent. Otherwise, it is necessary to carry out optimization experiments such as orthogonal design experiments for each type of muddy sludge, and carry out formula optimization experiments, which will cost a lot of labor and materials.
  • the present invention provides a method for optimizing the dosage of a chemical conditioning agent for deep dewatering of sludge, wherein the reference standard for the dosage of the key chemical conditioning agent is improved.
  • the invention can effectively solve the problem that the sludge type and the sludge moisture content range are applicable to the sludge chemical conditioner dosage control method, and the invention can effectively adapt to different muddy sludges, and differently
  • the practice of deep dewatering engineering of characteristic sludge has a good guiding role.
  • a chemical conditioning agent dosageing method for deep dewatering of sludge characterized in that it comprises the following steps:
  • the optimal dosage of the chemical conditioning agent to be applied to the sludge to be treated calculated according to the step (2), adding a chemical conditioning agent to the sludge to be treated for sludge conditioning treatment, and then Further, mechanical dehydration treatment is carried out to obtain a sludge having a deep dewatering treatment having a water content of less than 60%.
  • the chemical conditioning agent is a composite conditioning agent consisting of an oxidizing agent-skeletal construct; the oxidizing agent in the chemical conditioning agent comprises a Fenton reagent, a persulfate conditioning agent, a permanganate, and zero. At least one of the ferrous iron conditioning agents; the backbone construct in the chemical conditioning agent comprising at least one of lime, fly ash, diatomaceous earth, phosphogypsum, and cement.
  • the organic matter of the specific sludge The content is 20 to 70%.
  • the chemical conditioning agent dosage is optimized based on the organic content in the sludge to be treated, the optimization method can effectively adapt to different muddy soils. Mud has a good guiding effect on the practice of deep dewatering engineering of different characteristics of sludge.
  • the sludge chemical conditioning agent dosage control method has a chemical conditioning agent dosage method based on sludge volume (% by volume, or mg/L), but the conditioning effect cannot be controlled due to large fluctuation of sludge moisture content;
  • a chemical conditioning agent dosage method based on dry sludge (mg/g DS, or %DS) but the conditioning effect cannot be controlled due to the large fluctuation of organic matter content in the sludge.
  • the sludge deep dewatering method of the invention adopts an agent dosage method based on sludge organic matter content (such as mg/g organic matter, that is, a chemical conditioning agent corresponding to the unit mass organic matter), and can effectively adapt to different muddy sludges. It has a good guiding effect on the practice of deep dewatering engineering with different characteristics.
  • the method has simple steps, and the chemical conditioning agent dosage for sludge organic matter content has strong mud adaptability, can improve the utilization rate of the conditioning agent, save cost, and is suitable for large-scale promotion.
  • the difficulty of the present invention lies in the need of sludge with different organic content as a research object, and carries out experimental research in this aspect, although researchers have found that sludge organic matter content has a great influence on sludge dewatering effect, but no specific solution has been proposed. And means of response.
  • the invention is based on the optimized dosage of dry sludge, and the sludge dewatering result of different organic matter content, the moisture content of the dewatered cake is very different, and it is difficult to meet the requirements of stability of the chemical conditioning and deep dewatering effect, and the use is proposed.
  • the dosage of sludge conditioner was optimized, and the conditioning and dewatering experiments of different batches of different sludges were obtained, and a well-adapted sludge conditioning and depth was obtained. Optimization and control methods for dosage of dehydrated pharmaceuticals.
  • the invention is based on the key factor affecting sludge conditioning: organic matter content, and the sludge conditioning agent dosage based on sludge unit mass organic matter for sludge deep dewatering is proposed (mg/g organic
  • the method of optimization and control of the new method breaks through the traditional conditioning method based on sludge volume (mg/L, or % by volume) and dry sludge (mg/g DS, or %DS).
  • the sludge deep dewatering chemical conditioning agent used in the method is a composite conditioning agent consisting of an oxidizing agent-skeletal construct.
  • the oxidizing agent includes one or a combination of a Fenton reagent, a persulfate conditioner, a permanganate, a zero-valent iron conditioner, etc., and the principle is to generate a strong oxidizing group or a oxidizing group such as a radical.
  • the mud floc performs a combination of reagents for destroying and releasing the bound water;
  • the skeleton construct includes an inorganic component such as lime, fly ash, diatomaceous earth, phosphogypsum, cement or the like as a main component.
  • the method makes the dosage of the sludge chemical conditioning agent matched with the organic matter content in the sludge, can greatly improve the utilization efficiency of the medicament, has good adaptability to different muddy sludges, and can be well applied to sewage of different sources. Depth dehydration and reduction engineering practice in mud.
  • the optimization method and the dosing control method for the sludge deep dewatering agent of the present invention are based on the calculation of the sludge chemical conditioning agent based on the sludge organic matter content.
  • the optimized formula obtained by the optimization method of the chemical conditioning agent has good universality for the sludge with different organic content.
  • the pharmaceutical dosage based on sludge organic matter content is much simpler. It is not necessary to carry out formula optimization experiments such as orthogonal design experiments on each of the different muddy sludges, which will save a lot of labor and material costs. This method laid the foundation for the practical practice of sludge deep dewatering.
  • the method for optimizing the dosage of the chemical conditioning agent for deep dewatering of the sludge in the invention is to carry out deep dewatering of the sludge after conditioning with a chemical conditioning agent, and deep dewatering of the sludge by destroying the organic floc structure of the sludge based on the organic matter content of the sludge.
  • the dosage of the chemical conditioning agent is optimized to have the following two effects:
  • an oxidizing agent-skeletal construct complex conditioning agent can be used as a cell disrupting agent to
  • the pH of the dewatered filtrate of the shale sludge is maintained between 6 and 7.
  • the filtrate can be directly returned to the biological pond of the sewage plant or used as a carbon source to strengthen the process of nitrogen and phosphorus removal from the sewage.
  • Secondary pollution; at the same time, the skeleton structure can improve the compressibility of the mud cake, maintain the flow path of the filtered water, and improve the dehydration efficiency.
  • the optimization method of the chemical conditioning agent dosage for deep dewatering of the sludge has a simple procedure, greatly improves the utilization rate of the medicament, reduces the optimization of the dosage of the medicament, and can effectively treat the deep dewatering of the sludge.
  • Figure 1 is a schematic view showing the form of moisture in the sludge
  • Figure 2 shows the relationship between organic matter content (VSS/TSS) and combined water content in sludge.
  • the embodiment of the invention provides an optimization method and a control method for the sludge deep dehydration chemical conditioning agent based on the sludge organic matter content in the sludge chemical conditioning agent.
  • the dosage of the chemical conditioning agent optimized by the method is matched with the organic matter content of the sludge, and the chemical conditioning agent can fully destroy the EPS structure of the sludge floc, release the bound water, reduce the compressibility of the organic matter, and have different volatile content.
  • the sludge has good adaptability.
  • the method for optimizing the dosage of the sludge deep dewatering and breaking cell reagent and the feeding control method comprises the following steps:
  • a specific sludge with a moderate organic content is administered in units of (mg/g organic matter mass), that is, a unit mass organic matter.
  • the dosage of the chemical conditioning agent is optimized to increase the dosage of the chemical conditioning agent of a certain sludge;
  • step S2 According to the optimized formula obtained in step S1, the sludge with different organic content is passed through the sewage-based The organic matter content of the mud is calculated to obtain an optimized formula of a chemical conditioning agent suitable for the sludge of the organic content;
  • the dosage of the organic chemical-based chemical conditioning agent is controlled to control the dosage, and the sludge conditioning and mechanical dehydration treatment are carried out to obtain a deep dewatered sludge having a water content of less than 60%.
  • the sludge may be municipal sludge taken from different times, different places, and different properties.
  • the municipal sludge having a sludge organic matter content of about 40% is preferentially selected as an experimental object for optimizing the dosage of the medicament.
  • the deep dehydration chemical conditioning agent is a composite conditioning agent consisting of an oxidizing agent-skeletal construct.
  • the oxidizing agent comprises one or a combination of Fenton reagent, persulfate conditioning agent, permanganate, zero-valent iron conditioning agent, etc.;
  • the skeleton construct comprises lime, fly ash, diatomaceous earth, phosphogypsum, cement A reagent such as an inorganic component.
  • the embodiment of the invention adopts the oxidizing agent-skeletal construct compound conditioning agent, and achieves the following two effects through the optimization process of the dosage of the organic substance based on the organic matter content of the sludge:
  • oxidizing agent-skeleton construct compound conditioning agent can be used as a cell breaking reagent to maintain the pH of the dewatered filtrate of different shale sludges between 6 and 7, avoiding corrosion of pipes and equipment, and the filtrate can Directly return to the biological tank of the sewage plant or as a carbon source to strengthen the process of nitrogen and phosphorus removal of sewage to avoid secondary pollution; at the same time, the skeleton structure can improve the compressibility of the mud cake, maintain the flow path of the filtered water, and improve the dehydration efficiency.
  • the optimization method of the chemical conditioning agent dosage for deep dewatering of the sludge has a simple procedure, greatly improves the utilization rate of the medicament, reduces the optimization of the dosage of the medicament, and can effectively treat the deep dewatering of the sludge.
  • the oxidizing agent-skeletal construct composite conditioning agent is now used as a chemical conditioning agent for deep dewatering of sludge, and the optimization process and control method based on the dosage of sludge organic matter are taken as an example. The invention is further described in detail.
  • This embodiment compares the method of controlling the dosage of the organic matter based on the organic matter content of the sludge with the conventional pharmaceutical dosage method based on the sludge DS dry basis; the steps are as follows:
  • S1 Selecting a municipal sludge with moderate organic content as the target, the fluctuation of organic matter content of municipal sludge in Wuhan is about 20%-60%. This example selects municipal sludge with 44% organic content as the representative.
  • the oxidizing agent-skeletal construct composite conditioning agent is optimized for the specific organic content of the sludge by the response surface method (mg/g organic matter mass) as the dosage unit of the compounding agent.
  • the oxidizing reagent comprises two components, and the skeletal construct comprises one component), and an optimized formula for the cytotoxic agent of the sludge is obtained: the cell breaking reagent A1, the cell breaking reagent B1 and the skeleton reagent C1
  • the addition amounts are 106.91, 86.16, 110.00 (mg/g organic matter);
  • step S2 calculating, according to the optimized formula obtained in step S1, the dosage of the organic matter content of the sludge based on the organic matter content of the sludge, and obtaining an optimized formula of the composite conditioning agent suitable for deep dewatering of the sludge of the organic matter content;
  • sludge with different organic content was taken in four different sewage treatment plants for verification test.
  • the sludge organic matter content of these four sewage treatment plants were: 25.6%, 41.20%, 49.67%, and 59.83%, respectively.
  • the optimized formula based on the sludge dry basis is added by the result optimized in step S1.
  • the dosage of pharmaceuticals based on the calculation of sludge dry basis content is shown in Table 2 below:
  • S3 Sludge Dewatering Treatment: The two kinds of pharmaceutical dosages calculated in the step S2 were separately subjected to sludge conditioning, and then subjected to mechanical dehydration treatment (filtration pressure 0.8 MPa, diaphragm pressing pressure 1.2 MPa).
  • the oxidizing agent-skeletal construct composite conditioning agent can be well adapted to sludge of different organic content after optimization of the method of the present invention.
  • the sludge dewatering effect can be obviously improved; for the sludge with low organic content, the dewatering effect equivalent to the traditional dosage is ensured in the case of greatly reducing the dosage of the medicament.
  • the adaptive formula obtained by the method for controlling the dosage of the sludge organic matter is used to verify the adaptability of different organic matter sludge; the steps are as follows:
  • the oxidizing agent-skeletal construct compounding agent is used to optimize the dosage of the composite conditioner for the sludge with the sludge organic content of 42.8% by the response surface method, and the sludge-based mass organic matter for the sludge is obtained.
  • the compounding agent is optimized for dosage: the dosage of the cell-breaking reagent A2 is 271 (mg/g organic matter mass), the dosage of the cell-breaking reagent B2 is 49 (mg/g organic matter mass), and the dosage of the skeleton construct C2 The dosage is 935 (mg/g organic matter mass);
  • the dosage of the organic conditioning agent is optimized by the response surface method for the sludge with the organic matter content of 49.8%, and the optimized formula for the compounding agent based on the sludge unit mass organic matter of the sludge is obtained:
  • the dosage of the cell reagent A2 was 269 (mg/g organic matter mass)
  • the dosage of the cell disrupting reagent B2 was 49 (mg/g organic matter mass)
  • the dosage of the skeleton construct C2 was 872 (mg/g organic matter). quality);
  • the dosage of the sludge based on the conventional sludge-based dry basis (mg/g DS) and the sludge volume (% by volume, or mg/L) is the most suitable for different sludges.
  • the optimal dosage of the oxidizing agent-skeletal construct compounding agent based on the sludge unit mass organic matter obtained by the optimization of the method of the present invention is very close, regardless of the sludge organic matter content.
  • the method of the invention can be well adapted to sludge with different organic content.
  • the method for controlling the dosage of the organic matter based on the sludge unit mass of different sludge deep dewatering composite conditioning agents is verified; the steps are as follows:
  • S1 Select a municipal sludge with moderate organic content.
  • 53.73% of municipal sludge is selected.
  • the oxidizing agent-skeletal construct compounding agent is optimized for the sludge with the organic matter content of 53.73% (mg/g organic matter mass) as the dosage unit of the pharmaceutical dosage unit.
  • Compound adjustment of deep dewatering of this kind of sludge The dosage of the three components in the agent was optimized.
  • the dosage of the cell breaking reagent A3, the reagent B3 and the skeleton reagent C3 were 100.15 (mg/g organic matter mass), 123.00 (mg/g organic matter mass), 650.00 ( Mg/g organic matter quality);
  • step S2 calculating, according to the optimized formula obtained in step S1, the dosage of the sludge of the organic matter content of the sludge with different organic matter content, and the optimized formula of the sludge deep dewatering composite conditioning agent suitable for the organic matter sludge;
  • Verification tests were carried out on sludges with different organic content in different sewage plants.
  • the sludge organic matter content of this sewage plant is: 46.14%.
  • the optimized formulation based on dry sludge is added by the results optimized in step S1.
  • the dosage of pharmaceuticals based on the calculation of dry sludge content is shown in Table 5 below:
  • S3 Sludge Dewatering Treatment: The two kinds of pharmaceutical dosages calculated in the step S2 were separately subjected to sludge conditioning, and then subjected to mechanical dehydration treatment (filtration pressure 0.8 MPa, diaphragm pressing pressure 1.2 MPa).
  • the oxidizing agent-skeletal construct composite conditioning agent can be well adapted to sludge of different organic content after optimization of the method of the present invention.
  • the sludge with high organic content can significantly improve the sludge dewatering effect; for the sludge with low organic content, it can ensure the equivalent of the traditional dosage when the dosage of the pesticide is greatly reduced. Dehydration effect.
  • the optimization of the deep dewatering conditioner for destroying the organic floc structure of the sludge only needs to be optimized for a representative sludge, and then it can be calculated according to the volatile content of different sludges.
  • the optimal dosage of the mud agent The number and cost of optimization experiments are greatly saved, the operation is simple and the effect is good, and the foundation for the deep dewatering practice of sludge is laid.
  • the optimization methods of the surface response method and the orthogonal test method in the present invention can be directly referred to the related prior art, for example, the related content published by Tony et al. in Chemosphere 2008, 72, (4), 673-677, and the like.
  • the method for optimizing the dosage of chemical conditioning agent for deep dewatering of sludge in the invention the calculation of the optimal dosage of chemical conditioning agent is based on the organic content of the sludge to be treated, and the determination of the organic content can be in accordance with national environmental protection standards.
  • HJ 761-2015 is a standard method for determining the organic matter of solid waste.

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Abstract

一种用于城市污水处理厂污泥深度脱水的化学调理剂投加量优化方法，包括以下步骤：(1)针对某一特定污泥，对添加到该特定污泥中的化学调理剂进行投加量的优化，从而得出单位质量有机物对应的化学调理剂最优投加比例；(2)根据步骤(1)得出的最优投加比例，对其他待处理污泥适用的化学调理剂最优投加量进行计算；(3)按步骤(2)计算得出的化学调理剂最优投加量，向待处理污泥中添加化学调理剂进行污泥调理处理，然后再进行机械脱水处理，从而得到含水率低于60％的深度脱水污泥。通过对关键化学调理剂投加量的参考基准进行改进，能够有效解决污泥化学调理剂投加量控制方法适用的污泥种类及污泥含水率范围窄的问题。

Description

一种用于污泥深度脱水的化学调理剂投加量优化方法 【技术领域】
本发明属于城市污水处理厂污泥处理技术领域，更具体地，涉及一种用于污泥深度脱水的化学调理剂投加量优化方法，该优化方法是对破坏污泥有机絮体结构的化学调理剂的投加量进行优化和控制，从而对污泥进行深度脱水(即，经脱水后的污泥其含水率低于60％)，可适用于对市政污泥的处理与处置，适用于前端污泥深度脱水减量化的处理。
【背景技术】
所谓市政污泥，即在城市污水厂活性污泥法处理中，产生的初沉污泥，剩余污泥的总称。主要有各种病原体和微生物、耗氧污染物、植物纤维、重金属、一般有机物质以及酸、碱、盐无机污染物等。市政污泥因含有较高的有机质，污泥絮体中含有大量亲水性强的胞外聚合物(简称EPS)造成结合水含量高，使泥、水分离困难。根据2013年统计数据，目前我国城市污水处理厂的污泥大约83％未得到有效处置，污泥含水率高，体积巨大，有机物含量变化大，污泥深度脱水困难是污泥处理与处置的瓶颈。目前城市污水处理厂普遍采用高分子絮凝剂(如PAM)调理，再通过高速离心机或带式压滤机脱水，仅能得到含水率80％左右的泥饼，难以达到《城镇污水处理厂污泥处置混合填埋用泥质》(GB/T 23485-2009)标准中用于混合填埋的指标要求(污泥含水率≤60％)。因此，需要对污泥进行深度脱水(污泥含水率降至60％以下)，使脱水泥饼达到后续处理与处置的要求。
市政污泥中水的存在方式一般包括70％自由水，30％结合水(包括毛细水、颗粒内部水和吸附水)。限制污泥脱水效率提高的影响因素很多，其中污泥EPS所形成的大量亲水性污泥絮体结构(包含大量结合水)是污泥脱水困难的重要原因。EPS是污泥有机物的主要组成部分，通过选择吸 收、官能团电离等作用可以吸附、吸收水分，表现出的高度亲水作用对污泥脱水不利。同时，污泥有机质含量高也是制约污泥脱水程度的重要因素。由于有机物在机械力高压的作用下容易压缩变形，在过滤的后期会堵塞滤饼的孔隙，即阻塞了水的过滤通道，导致目前脱水效率较低。一般的物理调理很难解决空隙水和毛细水的脱除问题，且有运行成本高，设备投资大等缺点。要达到深度脱水，必须破坏污泥高度亲水基团的带电絮体基质，且改善絮体的压缩性能，使污泥絮体网格中所含的结合水最大程度释放出来才能有效通过机械压滤的方式进行脱除。化学药剂调理是目前污泥深度脱水较为经济实用的调理的方法。
目前污泥化学调理剂投加量控制大多数是以干基污泥(mg/g DS，或％DS)(例如中国专利CN 104649533 A中自由产生物、硫化物和工业副产物石膏的药剂投加量分别为污泥干基重量的1～10％、1～10％和10～40％的药剂投加方法和美国专利US4587022 A中脱水干燥剂投加量至少为污泥干基的10％)。另一种污泥化学调理剂投加量常用控制方法是以污泥体积(体积百分数％，或者mg/L)(例如中国专利CN 105800909 A中浓缩药剂A、浓缩药剂B和浓缩药剂C的药剂投加量都为污泥总量的1.0～10.0％(体积百分数)的药剂投加方法和美国专利US6368511 B1中Fe2+、H2O2的投加量分别为污泥总量的1.125～6％、1.5～8％(体积百分数))为计量单位进行确定的。上述的常用的基于DS的化学调理剂投加方法(mg/g DS，或％DS)和基于污泥体积(mg/L)对于只涉及到污泥中自由水去除的常规的污泥处理工艺具有一定的适用性，比如：污泥沉降工艺、浓缩工艺、污泥离心脱水、带式压滤工艺等等。但是对于涉及到与EPS有机大分子紧密结合的结合水去除的深度脱水工艺适用性很差。
根据监测数据，污泥有机物含量与污泥来源，季节，降雨量等因素密切相关且差异较大。同一污水厂的污泥在不同季节，其有机物含量的变化范围达到20％～50％，不同污水厂因进水水质和工艺的不同，其产生的污泥 有机物含量也差异巨大。现有专利技术以及文献中推荐的基于干基污泥(mg/g DS)及基于污泥体积(mg/L)的药剂投加方法对于高有机物含量的污泥深度脱水效果较差，而对于易脱水、有机物含量较低的污泥，所投加的药剂过多，造成了药剂的浪费。其中污泥中影响脱水性能重要的因素EPS含量是污泥有机物含量的重要组成部分，由于污泥中有机物含量对结合水影响非常显著，通常的污泥化学调理剂投加量的控制方法无法适应不同有机物含量的污泥泥质变化。基于污泥干基含量和污泥体积计算的药剂投加方法得到的优化配方，药剂投加量不随污泥有机物含量变化而变化，从而造成了传统的药剂投加方法对不同有机物含量污泥的适应性较差。特别是对于某一给定的污泥深度脱水泥饼含水率的目标，比如60wt％，常用的基于DS的化学调理剂投加方法(mg/g DS，或％DS)，对于较高有机物含量的污泥，容易出现达不到设计的泥饼含水率目标；对于较低有机物含量的污泥，容易出现药剂投加过量。否则，需要对每一种泥质的污泥，都需要展开正交设计实验等优化方法，开展配方优化实验，这样将花费大量的人工费、材料费。
Jialin Liang等人在2015年发现了污泥结合水含量与污泥有机物有显著的线性关系，R2＝0.9701(如图2所示)，其成果发表在杂志Water Research84(2015),243～254。在污泥深度脱水过程中，如何改变污泥中结合水的存在状态，如何破坏污泥中EPS的污泥絮体亲水性结构，以及如何解决污泥化学调理剂对不同泥质适应性的问题，是进一步提高污泥脱水程度的突破口。因此，目前亟需一种药剂投加方法所优化的药剂投加配方能达到适应不同有机物含量的剩余污泥，保证其经调理后脱水性能既能够达到预定深度脱水目标(脱水污泥含水率低于60％)，同时不会造成化学调理剂过量投加造成药剂的浪费及成本增加。
【发明内容】
针对现有技术的以上缺陷或改进需求，本发明的目的在于提供一种用于污泥深度脱水的化学调理剂投加量优化方法，其中通过对关键化学调理剂投加量的参考基准进行改进，与现有技术相比能够有效解决污泥化学调理剂投加量控制方法适用的污泥种类及污泥含水率范围窄的问题，本发明能有效地适应不同泥质的污泥，对不同特性污泥深度脱水工程实践有很好的指导作用。
为实现上述目的，按照本发明，提供了一种用于污泥深度脱水的化学调理剂投加量优化方法，其特征在于，包括以下步骤：
(1)通过表面响应法或正交试验法，针对某一特定污泥以该特定污泥的有机物含量为参考，对添加到该特定污泥中的化学调理剂进行投加量的优化，得到使得该特定污泥综合脱水效果最佳时的化学调理剂最优投加量，从而得出单位质量有机物对应的化学调理剂最优投加比例；
(2)根据所述步骤(1)得出的所述单位质量有机物对应的化学调理剂最优投加比例，对其他待处理污泥适用的化学调理剂最优投加量进行计算，使得针对该待处理污泥的单位质量有机物对应的化学调理剂投加比例与所述步骤(1)得出的所述单位质量有机物对应的化学调理剂最优投加比例两者保持一致；
(3)按所述步骤(2)计算得出的所述待处理污泥适用的化学调理剂最优投加量，向所述待处理污泥中添加化学调理剂进行污泥调理处理，然后再进行机械脱水处理，从而得到含水率低于60％的深度脱水处理后的污泥。
作为本发明的进一步优选，所述化学调理剂为氧化试剂-骨架构建体组成的复合调理剂；该化学调理剂中的氧化试剂包括Fenton试剂、过硫酸盐调理剂、高锰酸盐、以及零价铁调理剂中的至少一种；该化学调理剂中的骨架构建体包括石灰、粉煤灰、硅藻土、磷石膏、以及水泥中的至少一种。
作为本发明的进一步优选，所述步骤(1)中，所述特定污泥的有机物 含量为20～70％。
通过本发明所构思的以上技术方案，与现有技术相比，由于是基于待处理污泥中的有机物含量对化学调理剂投加量进行优化，该优化方法能有效地适应不同泥质的污泥，对不同特性污泥深度脱水工程实践均具有很好的指导作用。
由于污水处理厂的进水水质波动，污水处理工艺不同，季节气候变化等差异，导致污泥的泥质差异很大。通常污泥化学调理剂投加量控制方法有基于污泥体积(体积百分数％，或者mg/L)的化学调理剂投加方法，但是由于污泥含水率波动大，导致调理效果无法控制；还有基于干基污泥(mg/g DS，或％DS)的化学调理剂投加方法，但是由于污泥中的有机物含量波动大，导致调理效果无法控制。本发明污泥深度脱水方法采用基于污泥有机物含量(如mg/g有机物，即控制单位质量有机物对应的化学调理剂投加比例)的药剂投加方法能有效地适应不同泥质的污泥，对不同特性污泥深度脱水工程实践有很好的指导作用。本方法步骤简单，针对污泥有机物含量确定化学调理剂投加量具有很强的泥质适应能力，可以提高调理剂利用率，节约成本，适合大规模推广。
本发明的难点在于需要不同有机物含量的污泥作为研究对象，开展该方面的实验研究，尽管目前有研究者发现污泥有机物含量对污泥脱水效果影响较大，但是仍没有提出具体的解决办法及应对手段。本发明则是基于干基污泥的优化药剂投加量对不同有机物含量的污泥脱水结果中，脱水泥饼含水率差别很大，难以满足药剂调理及深度脱水效果稳定性的要求，提出使用了基于污泥有机物含量为优化参考对象，优化污泥调理剂投加量，并针对不同污泥的不同批次的调理剂优化及脱水实验，得出了一个适应性好的污泥调理及深度脱水的药剂投加量优化和控制方法。
本发明是根据影响污泥调理的关键因子：有机物含量，提出了用于污泥深度脱水的基于污泥单位质量有机物的污泥调理剂投加量(mg/g有机 物)优化方法及控制新方法，突破了基于污泥体积(mg/L，或者体积百分数％)、干基污泥(mg/g DS，或％DS)调理剂投加量的传统调理方法。本方法使用的污泥深度脱水化学调理剂为氧化试剂-骨架构建体组成的复合调理剂。其中氧化试剂包括Fenton试剂、过硫酸盐调理剂、高锰酸盐、零价铁调理剂等中的一种或者联合使用，其原理是通过产生强氧化基团或者自由基等氧化基团对污泥絮体进行破坏释放结合水的试剂组合；骨架构建体包括石灰、粉煤灰、硅藻土、磷石膏、水泥等无机物为主要成分的试剂。本方法使污泥化学调理剂投加量与污泥中有机物含量相匹配，能大幅度提高药剂的利用效率，对不同泥质污泥有良好适应性，能很好地应用于不同来源的污泥深度脱水与减量化工程实践中。
本发明的污泥深度脱水药剂的优化方法及投加控制方法采用基于污泥有机物含量计算得到污泥化学调理剂的投加量。该化学调理剂投加优化方法得到的优化配方对不同有机物含量的污泥具有较好的普适性。另外，相对于传统的基于污泥干基(mg/g DS，或％DS)和基于污泥体积(体积百分数％，或mg/L)的药剂投加方法，基于污泥有机物含量的药剂投加量优化方法更加简便。不需要对每一种不同泥质的污泥开展正交设计实验等配方优化实验，这样将节省大量的人工费、材料费。该方法为污泥深度脱水实践工程奠定了基础。
本发明中用于污泥深度脱水的化学调理剂投加量优化方法是采用化学调理剂调理后进行污泥深度脱水，通过基于污泥有机物含量对破坏污泥有机絮体结构的污泥深度脱水的化学调理剂的投加量进行优化，具有以下两个效果：
(1)适应了不同有机物含量的污泥。克服了传统的基于污泥干基(mg/g DS，或％DS)和基于污泥体积(体积百分数％，或者mg/L)只对某一种特定污泥具有良好调理效果的局限性。
(2)使用氧化试剂-骨架构建体复合调理剂既可以作为破胞试剂能使不 同泥质的污泥的脱水滤液pH保持在6～7之间，避免管道和设备腐蚀的同时，滤液还能直接回流至污水厂生物池或者作为碳源强化污水脱氮除磷过程，避免二次污染；同时骨架构建体可以改善泥饼的可压缩性，保持过滤水的流动的通道，提高脱水效率。另外，该污泥深度脱水的化学调理剂投加量优化方法，程序简单，大大提高了药剂利用率，减少了大量的药剂投加量优化工作，可实现污泥的深度脱水的有效处理。
【附图说明】
图1是污泥中水分结合形式示意图；
图2是污泥中有机物含量(VSS/TSS)与结合水含量的关系。
【具体实施方式】
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。此外，下面所描述的本发明各个实施方式中所涉及到的技术特征只要彼此之间未构成冲突就可以相互组合。
本发明实施例提供了一种能针对污泥化学调理剂中的基于污泥有机物含量来进行污泥深度脱水化学调理剂的优化方法和控制方法。该方法所优化出的化学调理剂投加量与污泥有机物含量相匹配，化学调理剂能充分破坏污泥絮体EPS结构，释放结合水，降低有机质的可压缩性，对不同可挥发分含量污泥有良好的适应性。该污泥深度脱水破胞试剂投加量优化方法和投加控制方法包括如下步骤：
S1：通过表面响应面法，正交试验法等优化方法对某一种有机物含量适中的特定污泥，按药剂投加量以(mg/g有机物质量)为单位，即单位质量有机物的药剂投加量进行化学调理剂投加量优化，得到某一种污泥的化学调理剂投加优化配方；
S2：根据步骤S1得到的优化配方对不同有机物含量的污泥通过基于污 泥有机物含量进行计算，得到适用于该有机物含量污泥的化学调理剂的优化配方；
S3:使用该基于有机物含量的化学调理剂的优化配方进行投加量控制，并进行污泥调理和机械脱水处理，得到含水率低于60％的深度脱水污泥。
具体地，上述步骤S1中，污泥可以是取自于不同时间，不同地点，不同性质的市政污泥。为了使得步骤S1中的所优化的结果更具有代表性，优先选择污泥有机物含量为40％左右的市政污泥作为药剂投加量优化实验对象。
该步骤S1中，深度脱水化学调理剂为氧化试剂-骨架构建体组成的复合调理剂。其中氧化试剂包括Fenton试剂、过硫酸盐调理剂、高锰酸盐、零价铁调理剂等中的一种或者联合使用；骨架构建体包括石灰、粉煤灰、硅藻土、磷石膏、水泥等无机物为主要成分的试剂。
本发明实施例采用氧化试剂-骨架构建体复合调理剂，通过基于污泥有机物含量的药剂投加量优化过程，达到了以下两个效果：
(1)适应了不同有机物含量的污泥。克服了传统的基于污泥干基(mg/g DS，或％DS)和基于污泥体积(体积百分数％，或者mg/L)只对某一种特定污泥具有良好调理效果的局限性。
(2)使用氧化试剂-骨架构建体复合调理剂既可以作为破胞试剂能使不同泥质的污泥的脱水滤液pH保持在6～7之间，避免管道和设备腐蚀的同时，滤液还能直接回流至污水厂生物池或者作为碳源强化污水脱氮除磷过程，避免二次污染；同时骨架构建体可以改善泥饼的可压缩性，保持过滤水的流动的通道，提高脱水效率。另外，该污泥深度脱水的化学调理剂投加量优化方法，程序简单，大大提高了药剂利用率，减少了大量的药剂投加量优化工作，可实现污泥的深度脱水的有效处理。
现以氧化试剂-骨架构建体复合调理剂作为污泥深度脱水的化学调理剂，基于污泥有机物含量的药剂投加量的优化过程和控制方法为实例，对 本发明进行进一步详细说明。
实施例1：
本实施例是基于污泥有机物含量的药剂投加量控制方法与传统基于污泥DS干基的药剂投加方法效果对比；步骤如下：
S1：选择一个有机物含量适中的市政污泥为对象，武汉市市政污泥有机物含量波动范围约为20％-60％，本实例选择其中有机物含量44％的市政污泥为代表。通过响应面法对氧化试剂-骨架构建体复合调理剂对于该特定有机物含量的污泥进行以(mg/g有机物质量)为药剂投加单位的复合药剂三个组分投加量优化(其中属于氧化试剂的包括2种组分，属于骨架构建体的包括1种组分)，得到对于该种污泥的破胞药剂投加优化配方：破胞试剂A1、破胞试剂B1和骨架试剂C1投加量分别为106.91、86.16、110.00(mg/g有机物)；
S2：根据步骤S1得到的优化配方对不同有机物含量的污泥基于污泥有机物含量进行药剂投加量进行计算，得适用于该有机物含量污泥的污泥深度脱水的复合调理剂的优化配方；
本实例在四个不同污水厂取了不同有机物含量的污泥进行验证试验。这四个污水厂的污泥有机物含量分别为：25.6％，41.20％，49.67％，59.83％。
根据基于污泥有机物质量计算的药剂投加量如下表表1所示：
表1
Figure PCTCN2017071691-appb-000001
同时为了与基于污泥干基(mg/g DS)的药剂投加量控制方法进行比较，基于污泥干基的优化配方采用步骤S1所优化的结果进行投加。基于污泥干基含量计算的药剂投加量如下表表2所示：
表2
Figure PCTCN2017071691-appb-000002
S3：污泥脱水处理：将步骤S2中计算得到的两种药剂投加量分别进行污泥调理后，进行机械脱水处理(过滤压力0.8MPa，隔膜压榨压力1.2MPa)。
经测试，调理后的污泥经板框脱水后，两种药剂投加方法所得到的泥饼含水率如下表表3所示：
表3
Figure PCTCN2017071691-appb-000003
从上述结果可以明显看出氧化试剂-骨架构建体复合调理剂在本发明方法优化后能很好地适应不同有机物含量的污泥。对于高有机物含量的污泥能明显提高污泥脱水效果；对于低有机物含量的污泥，在大幅减少药剂投加的情况下，保证了与传统投加量相当的脱水效果。
实施例2：
本实施例是基于污泥有机物的药剂投加量控制方法得到的优化配方对不同有机物含量污泥的适应性验证；步骤如下：
S1：通过响应面法对氧化试剂-骨架构建体复合调理剂对于污泥有机物含量为42.8％的污泥进行复合调理剂投加量优化，得到对于该种污泥的基于污泥单位质量有机物的复合调理剂投加优化配方：破胞试剂A2的投加量为271(mg/g有机物质量)、破胞试剂B2的投加量为49(mg/g有机物质量)，骨架构建体C2的投加量为935(mg/g有机物质量)；
S2：同理，通过响应面法对有机物含量为49.8％的污泥进行复合调理剂投加量优化，得到对于该种污泥的基于污泥单位质量有机物的复合调理剂投加优化配方：破胞试剂A2的投加量为269(mg/g有机物质量)、破胞试剂B2的投加量为49(mg/g有机物质量)，骨架构建体C2的投加量为872(mg/g有机物质量)；
从上述结果可以明显看出，与传统的基于污泥干基(mg/g DS)和基于污泥体积(体积百分数％，或者mg/L)的优化方法对不同污泥的药剂投加量最优结果差异较大的情况相比，无论污泥有机物含量高低，氧化试剂-骨架构建体复合调理剂在本发明方法优化后得到的基于污泥单位质量有机物的最优投加量非常接近，说明本发明方法能很好地适应不同有机物含量的污泥。
实施例3：
本实施例是对不同污泥深度脱水复合调理剂的基于污泥单位质量有机物的药剂投加量控制方法进行验证；步骤如下：
S1：选择一个有机物含量适中的市政污泥为对象，本实例选择其中53.73％的市政污泥为代表。通过响应面法对氧化试剂-骨架构建体复合调理剂对于污泥有机物含量为53.73％的污泥进行以(mg/g有机物质量)为药剂投加单位的复合调理剂投加量优化，得到对于该种污泥深度脱水的复合调 理剂中3种组分投加量优化配方结果：破胞试剂A3、试剂B3和骨架试剂C3投加量分别为100.15(mg/g有机物质量)、123.00(mg/g有机物质量)、650.00(mg/g有机物质量)；
S2：根据步骤S1得到的优化配方对不同有机物含量的污泥基于污泥单位质量有机物进行药剂投加量进行计算，得适用于该有机物含量污泥的污泥深度脱水复合调理剂的优化配方；
在不同污水厂取不同有机物含量的污泥进行验证试验。这个污水厂的污泥有机物含量为：46.14％。
根据基于污泥有机物含量计算的药剂投加量如下表表4所示：
表4
Figure PCTCN2017071691-appb-000004
同时为了与基于干基污泥(mg/g DS)的药剂投加方法进行比较，基于干基污泥的优化配方采用步骤S1所优化的结果进行投加。基于干基污泥含量计算的药剂投加量如下表表5所示：
表5
Figure PCTCN2017071691-appb-000005
S3：污泥脱水处理：将步骤S2中计算得到的两种药剂投加量分别进行污泥调理后，进行机械脱水处理(过滤压力0.8MPa，隔膜压榨压力1.2MPa)。
经测试，调理后的污泥经板框脱水后，两种药剂投加量控制方法所得到的泥饼含水率如下表表6所示：
表6
Figure PCTCN2017071691-appb-000006
从上述结果可以明显看出氧化试剂-骨架构建体复合调理剂在本发明方法优化后能很好地适应不同有机物含量的污泥。对于同样质量的原始污泥，对于高有机物含量的污泥能明显提高污泥脱水效果；对于低有机物含量的污泥，在大幅减少药剂投加的情况下，保证了与传统投加量相当的脱水效果。
在实际工程中，针对破坏污泥有机絮体结构的深度脱水调理剂的优化只需对某一代表性的污泥进行优化实验后便可根据不同污泥可挥发分含量计算出适应于不同污泥的药剂最优投加量。大大节省了优化实验的次数与成本，操作简便且效果良好，为污泥深度脱水实践工程奠定了基础。
本发明中表面响应法、正交试验法的优化方法均可直接参考相关现有技术，例如Tony等人发表在Chemosphere 2008,72,(4),673-677文献上的相关内容等。
本发明中用于污泥深度脱水的化学调理剂投加量优化方法，化学调理剂最优投加量的计算是基于该待处理污泥有机物含量的，有机物含量的测定可按照国家环境保护标准HJ 761-2015中固体废物有机质测定标准方法测得。
本领域的技术人员容易理解，以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (3)

  1. 一种用于污泥深度脱水的化学调理剂投加量优化方法，其特征在于，包括以下步骤：
    (1)通过表面响应法或正交试验法，针对某一特定污泥以该特定污泥的有机物含量为参考，对添加到该特定污泥中的化学调理剂进行投加量的优化，得到使得该特定污泥综合脱水效果最佳时的化学调理剂最优投加量，从而得出单位质量有机物对应的化学调理剂最优投加比例；
    (2)根据所述步骤(1)得出的所述单位质量有机物对应的化学调理剂最优投加比例，对其他待处理污泥适用的化学调理剂最优投加量进行计算，使得针对该待处理污泥的单位质量有机物对应的化学调理剂投加比例与所述步骤(1)得出的所述单位质量有机物对应的化学调理剂最优投加比例两者保持一致；
    (3)按所述步骤(2)计算得出的所述待处理污泥适用的化学调理剂最优投加量，向所述待处理污泥中添加化学调理剂进行污泥调理处理，然后再进行机械脱水处理，从而得到含水率低于60％的深度脱水处理后的污泥。
  2. 如权利要求1所述用于污泥深度脱水的化学调理剂投加量优化方法，其特征在于，所述化学调理剂为氧化试剂-骨架构建体组成的复合调理剂；该化学调理剂中的氧化试剂包括Fenton试剂、过硫酸盐调理剂、高锰酸盐、以及零价铁调理剂中的至少一种；优选的，该化学调理剂中的骨架构建体包括石灰、粉煤灰、硅藻土、磷石膏、以及水泥中的至少一种。
  3. 如权利要求1所述用于污泥深度脱水的化学调理剂投加量优化方法，其特征在于，所述步骤(1)中，所述特定污泥的有机物含量为20～70％。
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