WO2020215775A1 - Novel municipal sludge conditioner - Google Patents

Novel municipal sludge conditioner Download PDF

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Publication number
WO2020215775A1
WO2020215775A1 PCT/CN2019/128128 CN2019128128W WO2020215775A1 WO 2020215775 A1 WO2020215775 A1 WO 2020215775A1 CN 2019128128 W CN2019128128 W CN 2019128128W WO 2020215775 A1 WO2020215775 A1 WO 2020215775A1
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sludge
biochar
ferrate
municipal
conditioner
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PCT/CN2019/128128
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French (fr)
Chinese (zh)
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袁浩然
吴佳欢
顾菁
陈勇
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中国科学院广州能源研究所
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Publication of WO2020215775A1 publication Critical patent/WO2020215775A1/en

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing

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  • the invention relates to the technical field of urban solid waste disposal and resource utilization, in particular to a new type of municipal sludge conditioner.
  • Inorganic polymer and organic polymer flocculants are still widely used around the world due to environmental problems such as corrosion, toxicity, and refractory degradation, but are gradually restricted.
  • modified natural polymer flocculants chitosan, starch, cellulose, soy protein, etc.
  • strong alkali NaOH
  • initiator NaIO 4
  • grafting monomer urea
  • coagulant diatomite, lime, gypsum, coal powder, lignite, fly ash, bagasse, wood chips, etc.
  • framework constructs which mainly reduce the compressibility of sludge and build water
  • the way of permeating the channel can improve the dewatering performance of sludge.
  • the dosage is too large and the improvement effect is general, so it is rarely used alone. Therefore, there is an urgent need to explore and study an environmentally friendly, efficient, and low-cost sludge conditioning technology.
  • the purpose of the present invention is to provide a new type of municipal sludge conditioner.
  • the preparation process of the municipal sludge conditioner is simple, safe and environmentally friendly. After the activated sludge is added to the sludge conditioner, the water content of the activated sludge cake is higher than that of current sewage. The water content of the mud cake in the treatment plant is significantly reduced.
  • An object of the present invention is to provide a new type of municipal sludge conditioner, including sludge biochar and ferrate, the mass ratio of sludge biochar and ferrate is 2 to 130:3,
  • the sludge biochar is prepared by the following steps.
  • the pretreated municipal sludge is pyrolyzed at 300°C to 900°C under an inert gas atmosphere for 1 to 4 hours to obtain sludge biochar.
  • the existing waste municipal sludge is used as a raw material to carry out pyrolysis and carbonization, and the pore structure and functional groups of the sludge biochar are enriched as a framework construct of a novel sludge conditioner.
  • the basic principle of the municipal sludge conditioner conditioning sludge dewatering proposed in the present invention is that the ferrate in the municipal sludge conditioner has strong oxidizing properties, so that the large flocs in the activated sludge are broken into smaller ones. Flocs release trapped water and reduce the moisture content of activated sludge (as shown in Figure 1).
  • the sludge biochar acts as a skeleton construct in the dehydration process, improves the compressibility of the sludge, and provides a seepage channel for water, so as to achieve the effect of reducing the moisture content of the sludge cake after dehydration (a in Figure 2) And b).
  • the ferrate salt is potassium ferrate (analytical grade potassium ferrate).
  • the specific steps for the pretreatment of the pretreated municipal sludge described in step (1) are as follows: the sludge cake is manually removed from solid impurities, then placed in an oven at 105°C to be dried to a constant weight, and then taken out.
  • the pulverizer is used for crushing and sieving to obtain pretreated municipal sludge.
  • the pretreated municipal sludge is pyrolyzed at 500°C to 600°C in an inert gas atmosphere for 2 hours to obtain sludge biochar.
  • the mass ratio of the sludge biochar and ferrate is 8 to 125:3.
  • the invention also provides the application of the new municipal sludge conditioner in sludge dewatering.
  • the method includes the following steps: adding ferrate to the activated sludge, stirring at a stirring speed of 100-300 rpm for 1-10 minutes, and then adding sludge biochar to the activated sludge, and then at 50-100 rpm After stirring at a stirring speed of 5 to 30 minutes, stand still for 0 to 120 minutes, and record the static settlement conditions. After dehydration treatment, the sludge dehydration rate is obtained.
  • the pH value of the activated sludge is 2-7.
  • ferrate is added to every 100 mL of activated sludge, and 0.25 to 1.3 g of sludge biochar is added to every 100 mL of activated sludge.
  • the municipal sludge conditioner based on sludge as a raw material provides a new way for the treatment and disposal of sludge dehydration and resource utilization.
  • the existing waste municipal sludge is used as a raw material to carry out pyrolysis and carbonization to enrich the pore structure and functional groups of the sludge biochar as a framework construct of a novel conditioner.
  • the sludge conditioner proposed in the present invention avoids the use of acid-base catalysts or organic solvents, is environmentally friendly, readily available raw materials, low production cost, and has a good dehydration effect of the sludge conditioner.
  • Figure 1 is a basic schematic diagram of the dewatering of sludge treated by the municipal sludge conditioner of the present invention
  • Figure 2 is a basic schematic diagram of sludge dewatering by the municipal sludge conditioner of the present invention.
  • Potassium ferrate was purchased from Shanghai Macleans Biochemical Technology Co., Ltd.
  • the activated sludge in the following examples was taken from a sewage treatment plant in Foshan City, Guangdong province.
  • the municipal sludge cake is manually removed from solid impurities, it is placed in an oven at 105°C to be dried to a constant weight and then taken out, crushed and sieved to obtain pretreated municipal sludge, and then placed in an inert gas atmosphere at 300°C After pyrolysis at ⁇ 900°C, sludge biochar is obtained.
  • the municipal sludge cake is manually removed from solid impurities, it is placed in an oven at 105°C to be dried to a constant weight and then taken out, crushed and sieved to obtain the pretreated municipal sludge, and then the pretreated municipal sludge The sludge is pyrolyzed at 600°C under inert gas atmosphere for 2h to obtain sludge biochar.
  • the municipal sludge cake is manually removed from solid impurities, it is placed in an oven at 105°C to be dried to a constant weight and then taken out, crushed and sieved to obtain the pretreated municipal sludge, and then the pretreated municipal sludge The sludge is pyrolyzed at 600°C under inert gas atmosphere for 2h to obtain sludge biochar.
  • the municipal sludge cake is manually removed from solid impurities, it is placed in an oven at 105°C to be dried to a constant weight and then taken out, crushed and sieved to obtain the pretreated municipal sludge, and then the pretreated municipal sludge Sludge biochar was obtained under different pyrolysis conditions under inert gas atmosphere (see Table 3 for specific conditions).
  • the municipal sludge cake is manually removed from solid impurities, it is placed in an oven at 105°C to be dried to a constant weight and then taken out, crushed and sieved to obtain the pretreated municipal sludge, and then the pretreated municipal sludge The sludge is pyrolyzed at 600°C under inert gas atmosphere for 2h to obtain sludge biochar.
  • the water content of the sludge is 83.32%, and the water content of the cationic polyacrylamide used in Comparative Example 2 is 78.93%. It can be concluded from Table 5 that the sludge biochar synergizes with ferric acid The effect of potassium co-conditioning of sludge is better than that of sludge biochar alone, and the optimal effect of mud cake moisture content after co-conditioning is 53.9%. This value is far lower than the moisture content of the directly dehydrated activated sludge cake and the moisture content of the cationic polyacrylamide currently used in sewage treatment plants.
  • the sludge conditioner provided by the present invention has an excellent dehydration effect, can efficiently remove the water content in the sludge cake, and has the best activated sludge dehydration effect.

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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

A novel municipal sludge conditioner, comprising a sludge biochar and a ferrate. The mass ratio of the sludge biochar to the ferrate is 2-130:3. The sludge biochar and the ferrate are prepared per the following step: pretreated municipal sludge is pyrolyzed between 300 °C and 900 °C in an inert gas atmosphere for 1-4 h to produce the sludge biochar. The municipal sludge conditioner, with municipal sludge serving as the raw material thereof, provides a novel route for a dewatering treatment, disposal, and resource utilization of sludge.

Description

一种新型市政污泥调理剂A new type of municipal sludge conditioner 技术领域：Technical field:
本发明涉及城镇固体废弃物处置与资源化技术领域，尤其是涉及一种新型市政污泥调理剂。The invention relates to the technical field of urban solid waste disposal and resource utilization, in particular to a new type of municipal sludge conditioner.
背景技术：Background technique:
我国主要城市生活污水排放量自2010以来每年以大于5.3％增长率增加。2016年生活污水排放量达到了176.84亿吨，按照0.3％的比例估算，市政污泥产量约为5305万吨。浓缩后的市政污泥含水率仍高达95％～97％，填埋处理要求污泥含水率不得高于60％，焚烧处理要求含水率低于50％，热解处理虽无规范要求，过高的含水率必然因水分气化而耗费大量的热量。含水率过高为污泥后续处理处置，特别是焚烧、热解等能源化利用带来极大的挑战。因此，污泥脱水是污泥后续处理处置的关键，实践证明，没有预处理(调理)的污泥几乎不可能实现机械脱水。The discharge of domestic sewage in major cities in my country has increased at an annual rate of more than 5.3% since 2010. In 2016, the discharge of domestic sewage reached 17.684 billion tons. According to an estimate of 0.3%, the output of municipal sludge was about 53.05 million tons. The water content of the concentrated municipal sludge is still as high as 95%-97%. The landfill treatment requires that the water content of the sludge should not be higher than 60%, and the incineration treatment requires a water content of less than 50%. Although the pyrolysis treatment has no standard requirements, it is too high The moisture content must consume a lot of heat due to the vaporization of moisture. Excessive water content brings great challenges to the subsequent treatment and disposal of sludge, especially energy utilization such as incineration and pyrolysis. Therefore, sludge dewatering is the key to the subsequent treatment and disposal of sludge. Practice has proved that it is almost impossible to achieve mechanical dewatering of sludge without pretreatment (conditioning).
无机聚合物和有机聚合物絮凝剂由于腐蚀、毒性、难降解等环境问题，目前仍在世界范围内广泛使用，但逐渐受到限制。为获得环境友好的絮凝剂，改性天然高分子絮凝剂(壳聚糖、淀粉、纤维素、大豆蛋白等)其改性、生产过程中仍需消耗以牺牲大量环境成本得来的化学试剂，例如纤维素改性所需要的强碱(NaOH)、引发剂(NaIO 4)、接枝单体(尿素)等。以高环境成本为代价生产用于改善污泥脱水性能的絮凝剂，导致其环保性下降。此外，还有一类混凝剂(硅藻土、石灰、石膏、煤粉、褐煤、粉煤灰、甘蔗渣、木屑等)，或者称作骨架构建体，主要通过降低污泥压缩性、构建水渗透通道的方式，改善污泥脱水性能，然而其存在用量过大，改善效果一般的问题，很少单独使用。因此，当前亟需探索和研究一种环保、 高效、低成本的污泥调理技术。 Inorganic polymer and organic polymer flocculants are still widely used around the world due to environmental problems such as corrosion, toxicity, and refractory degradation, but are gradually restricted. In order to obtain environmentally friendly flocculants, modified natural polymer flocculants (chitosan, starch, cellulose, soy protein, etc.) are modified and produced in the process of still consuming chemical reagents obtained at the expense of a large amount of environmental costs. For example, strong alkali (NaOH), initiator (NaIO 4 ), grafting monomer (urea), etc. required for cellulose modification. The production of flocculants for improving the dewatering performance of sludge at the expense of high environmental costs has led to a decline in environmental protection. In addition, there is a type of coagulant (diatomite, lime, gypsum, coal powder, lignite, fly ash, bagasse, wood chips, etc.), or framework constructs, which mainly reduce the compressibility of sludge and build water The way of permeating the channel can improve the dewatering performance of sludge. However, it has the problem that the dosage is too large and the improvement effect is general, so it is rarely used alone. Therefore, there is an urgent need to explore and study an environmentally friendly, efficient, and low-cost sludge conditioning technology.
发明内容：Summary of the invention:
本发明的目的是提供一种新型市政污泥调理剂，该市政污泥调理剂的制备过程简便，安全环保，活性污泥添加该污泥调理剂脱水后活性污泥泥饼含水率较目前污水处理厂泥饼含水率显著降低。The purpose of the present invention is to provide a new type of municipal sludge conditioner. The preparation process of the municipal sludge conditioner is simple, safe and environmentally friendly. After the activated sludge is added to the sludge conditioner, the water content of the activated sludge cake is higher than that of current sewage. The water content of the mud cake in the treatment plant is significantly reduced.
本发明的一个目的是提供了一种新型市政污泥调理剂，包括污泥生物炭和高铁酸盐，所述的污泥生物炭和高铁酸盐的质量比为2～130:3，所述的污泥生物炭由如下步骤制备得到，将预处理后的市政污泥在惰性气体氛围下300℃～900℃热解1～4h后得到污泥生物炭。An object of the present invention is to provide a new type of municipal sludge conditioner, including sludge biochar and ferrate, the mass ratio of sludge biochar and ferrate is 2 to 130:3, The sludge biochar is prepared by the following steps. The pretreated municipal sludge is pyrolyzed at 300°C to 900°C under an inert gas atmosphere for 1 to 4 hours to obtain sludge biochar.
本发明中，利用现有废弃物市政污泥为原料，进行热解炭化，丰富污泥生物炭的孔隙结构及官能团，作为新型污泥调理剂的骨架构建体。In the present invention, the existing waste municipal sludge is used as a raw material to carry out pyrolysis and carbonization, and the pore structure and functional groups of the sludge biochar are enriched as a framework construct of a novel sludge conditioner.
本发明提出的市政污泥调理剂调理污泥脱水的基本原理是，该市政污泥调理剂中的高铁酸盐因具有强氧化性，使得活性污泥中的大块絮体被破解成较小絮体，释放出截留水，降低活性污泥的含水率(如图1所示)。污泥生物炭在脱水过程起到骨架构建体的作用，提高污泥的可压缩性，为水分提供渗流通道，从而达到降低脱水后污泥泥饼的含水率的效果(如图2中的a和b所示)。The basic principle of the municipal sludge conditioner conditioning sludge dewatering proposed in the present invention is that the ferrate in the municipal sludge conditioner has strong oxidizing properties, so that the large flocs in the activated sludge are broken into smaller ones. Flocs release trapped water and reduce the moisture content of activated sludge (as shown in Figure 1). The sludge biochar acts as a skeleton construct in the dehydration process, improves the compressibility of the sludge, and provides a seepage channel for water, so as to achieve the effect of reducing the moisture content of the sludge cake after dehydration (a in Figure 2) And b).
优选地，所述的高铁酸盐为高铁酸钾(分析纯级高铁酸钾)。Preferably, the ferrate salt is potassium ferrate (analytical grade potassium ferrate).
优选地，步骤(1)所述的预处理后的市政污泥的预处理的具体步骤如下：将污泥泥饼先进行手动剔除固体杂质后，置于烘箱105℃干燥至恒重后取出，用粉碎机进行粉碎处理并过筛，得到预处理后的市政污泥。Preferably, the specific steps for the pretreatment of the pretreated municipal sludge described in step (1) are as follows: the sludge cake is manually removed from solid impurities, then placed in an oven at 105°C to be dried to a constant weight, and then taken out. The pulverizer is used for crushing and sieving to obtain pretreated municipal sludge.
优选地，将预处理后的市政污泥在惰性气体氛围下500℃～600℃热解2h后得到污泥生物 炭。Preferably, the pretreated municipal sludge is pyrolyzed at 500°C to 600°C in an inert gas atmosphere for 2 hours to obtain sludge biochar.
优选地，所述的污泥生物炭和高铁酸盐的质量比为8～125:3。Preferably, the mass ratio of the sludge biochar and ferrate is 8 to 125:3.
本发明还提供了新型市政污泥调理剂在污泥脱水中的应用。The invention also provides the application of the new municipal sludge conditioner in sludge dewatering.
优选地，包括如下步骤：将高铁酸盐加入到活性污泥中，以100～300rpm的搅拌速度搅拌1～10min后，再将污泥生物炭投加到活性污泥中，再以50～100rpm的搅拌速度搅拌5～30min后，静止0～120min，并记录静置沉降情况，经脱水处理后，得到污泥脱水率。Preferably, the method includes the following steps: adding ferrate to the activated sludge, stirring at a stirring speed of 100-300 rpm for 1-10 minutes, and then adding sludge biochar to the activated sludge, and then at 50-100 rpm After stirring at a stirring speed of 5 to 30 minutes, stand still for 0 to 120 minutes, and record the static settlement conditions. After dehydration treatment, the sludge dehydration rate is obtained.
优选地，所述的活性污泥的pH值为2～7。Preferably, the pH value of the activated sludge is 2-7.
优选地，每100mL活性污泥中加入0.06～0.3g的高铁酸盐，每100mL活性污泥中加入0.25～1.3g的污泥生物炭。Preferably, 0.06 to 0.3 g of ferrate is added to every 100 mL of activated sludge, and 0.25 to 1.3 g of sludge biochar is added to every 100 mL of activated sludge.
本发明提供的基于污泥为原料的市政污泥调理剂，为污泥脱水的处理处置及资源化利用提供了新的途径。The municipal sludge conditioner based on sludge as a raw material provided by the present invention provides a new way for the treatment and disposal of sludge dehydration and resource utilization.
本发明的有益效果是：The beneficial effects of the present invention are:
(1)本发明中，利用现有废弃物市政污泥为原料，进行热解炭化，丰富污泥生物炭的孔隙结构及官能团，作为新型调理剂的骨架构建体。(1) In the present invention, the existing waste municipal sludge is used as a raw material to carry out pyrolysis and carbonization to enrich the pore structure and functional groups of the sludge biochar as a framework construct of a novel conditioner.
(2)本发明提供的基于污泥为原料的市政污水调理剂制备方法，为脱水污泥的处理处置及资源化利用提供了新的途径。(2) The preparation method of municipal sewage conditioner based on sludge as raw material provided by the present invention provides a new way for the treatment, disposal and resource utilization of dewatered sludge.
(3)本发明提出的污泥调理剂，避免了使用酸碱催化剂或有机溶剂，环保，原料易得，生产成本低，污泥调理剂的脱水效果良好。(3) The sludge conditioner proposed in the present invention avoids the use of acid-base catalysts or organic solvents, is environmentally friendly, readily available raw materials, low production cost, and has a good dehydration effect of the sludge conditioner.
附图说明：Description of the drawings:
图1为本发明市政污泥调理剂调理污泥脱水的基本原理图；Figure 1 is a basic schematic diagram of the dewatering of sludge treated by the municipal sludge conditioner of the present invention;
图2为本发明市政污泥调理剂调理污泥脱水的基本原理图。Figure 2 is a basic schematic diagram of sludge dewatering by the municipal sludge conditioner of the present invention.
具体实施方式：Detailed ways:
下面结合具体实例，进一步阐明本发明。应该理解，这些实施例仅用于说明本发明，而不用于限定本发明的保护范围。在实际应用中技术人员根据本发明做出的改进和调整，仍属于本发明的保护范围。The present invention will be further clarified below in conjunction with specific examples. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the protection scope of the present invention. Improvements and adjustments made by technical personnel according to the present invention in practical applications still belong to the protection scope of the present invention.
除特别说明，本发明使用的设备和试剂为本技术领域常规市购产品。高铁酸钾购自上海麦克林生化科技有限公司。下述实施例中的活性污泥取自广东省佛山市污水处理厂。Unless otherwise specified, the equipment and reagents used in the present invention are conventional commercially available products in the technical field. Potassium ferrate was purchased from Shanghai Macleans Biochemical Technology Co., Ltd. The activated sludge in the following examples was taken from a sewage treatment plant in Foshan City, Guangdong Province.
将市政污泥泥饼先进行手动剔除固体杂质后，置于烘箱105℃干燥至恒重后取出，进行粉碎处理并过筛，得到预处理后的市政污泥，然后在惰性气体氛围下300℃～900℃热解后得到污泥生物炭。After the municipal sludge cake is manually removed from solid impurities, it is placed in an oven at 105°C to be dried to a constant weight and then taken out, crushed and sieved to obtain pretreated municipal sludge, and then placed in an inert gas atmosphere at 300°C After pyrolysis at ~900℃, sludge biochar is obtained.
实施例1Example 1
将市政污泥泥饼先进行手动剔除固体杂质后，置于烘箱105℃干燥至恒重后取出，进行粉碎处理并过筛，得到预处理后的市政污泥，然后将预处理后的市政污泥在惰性气体氛围下600℃热解2h后得到污泥生物炭。After the municipal sludge cake is manually removed from solid impurities, it is placed in an oven at 105°C to be dried to a constant weight and then taken out, crushed and sieved to obtain the pretreated municipal sludge, and then the pretreated municipal sludge The sludge is pyrolyzed at 600°C under inert gas atmosphere for 2h to obtain sludge biochar.
称取0.6g的污泥生物炭6份，分别加入pH值为2、3、4、5、6和7的100mL的活性污泥中以100rpm的搅拌速度搅拌5min，搅拌完成后，静置30min后，对其进行脱水处理，得到污泥脱水率，不同pH值下活性污泥的脱水率如表1所示。Weigh 6 parts of 0.6g sludge biochar, add 100mL activated sludge with pH values of 2, 3, 4, 5, 6 and 7 and stir for 5 minutes at a stirring speed of 100 rpm. After the stirring is completed, let stand for 30 minutes Afterwards, it was dehydrated to obtain the sludge dehydration rate. The dehydration rate of activated sludge under different pH values is shown in Table 1.
表1Table 1
活性污泥pH值PH value of activated sludge 22 33 44 55 66 77
活性污泥含水率(％)Moisture content of activated sludge (%) 70.7270.72 68.9868.98 73.6473.64 7474 75.3875.38 74.4674.46
由表1可以得出，在pH值为2～3的活性污泥，活性污泥含水率较小，污泥生物炭在pH值为3的活性污泥中脱水效果最好。It can be concluded from Table 1 that in the activated sludge with a pH value of 2 to 3, the water content of the activated sludge is smaller, and the sludge biochar has the best dehydration effect in the activated sludge with a pH value of 3.
实施例2Example 2
将市政污泥泥饼先进行手动剔除固体杂质后，置于烘箱105℃干燥至恒重后取出，进行粉碎处理并过筛，得到预处理后的市政污泥，然后将预处理后的市政污泥在惰性气体氛围下600℃热解2h后得到污泥生物炭。After the municipal sludge cake is manually removed from solid impurities, it is placed in an oven at 105°C to be dried to a constant weight and then taken out, crushed and sieved to obtain the pretreated municipal sludge, and then the pretreated municipal sludge The sludge is pyrolyzed at 600°C under inert gas atmosphere for 2h to obtain sludge biochar.
量取pH值为3的100mL的活性污泥6份，分别加入0.25g、0.5g、0.6g、0.8g、1.0g和1.3g的污泥生物炭以100rpm的搅拌速度搅拌5min，搅拌完成后，静置30min后，对其进行脱水处理，得到污泥脱水率，不同质量的污泥生物炭活性污泥的脱水率如表2所示。Measure 6 parts of 100mL activated sludge with a pH of 3, add 0.25g, 0.5g, 0.6g, 0.8g, 1.0g and 1.3g of sludge biochar, respectively, and stir at 100rpm for 5min. After the stirring is complete After standing for 30 minutes, it was dehydrated to obtain the sludge dehydration rate. The dehydration rate of sludge biochar activated sludge of different quality is shown in Table 2.
表2Table 2
活性污泥(g)Activated sludge (g) 0.250.25 0.50.5 0.60.6 0.80.8 1.01.0 1.31.3
活性污泥含水率(％)Moisture content of activated sludge (%) 70.4470.44 71.2371.23 67.8067.80 61.6661.66 59.9459.94 72.272.2
由表2可以得出，在pH值为3的活性污泥中，污泥生物炭的加入量为0.8～1.0g时的活性污泥含水率较小，每100mL的活性污泥中加入1.0g污泥生物炭，活性污泥脱水效果最好。It can be concluded from Table 2 that in the activated sludge with a pH of 3, the water content of the activated sludge is relatively small when the amount of sludge biochar added is 0.8-1.0g, and 1.0g is added to every 100mL of activated sludge. Sludge biochar has the best dewatering effect of activated sludge.
实施例3Example 3
将市政污泥泥饼先进行手动剔除固体杂质后，置于烘箱105℃干燥至恒重后取出，进行粉碎处理并过筛，得到预处理后的市政污泥，然后将预处理后的市政污泥在惰性气体氛围下不同热解条件下(具体条件参见表3)得到污泥生物炭。After the municipal sludge cake is manually removed from solid impurities, it is placed in an oven at 105°C to be dried to a constant weight and then taken out, crushed and sieved to obtain the pretreated municipal sludge, and then the pretreated municipal sludge Sludge biochar was obtained under different pyrolysis conditions under inert gas atmosphere (see Table 3 for specific conditions).
量取pH值为3的100mL的活性污泥，分别加入1.0g的上述不同热解条件下的污泥生物炭以100rpm的搅拌速度搅拌5min，搅拌完成后，静置30min后，对其进行脱水处理， 得到污泥脱水率，不同热解条件下的污泥生物炭活性污泥的脱水率如表3所示。Measure 100 mL of activated sludge with a pH of 3, add 1.0 g of the sludge biochar under different pyrolysis conditions mentioned above and stir for 5 minutes at a stirring speed of 100 rpm. After the stirring is completed, let it stand for 30 minutes and then dehydrate it. After treatment, the sludge dehydration rate is obtained. The dehydration rate of sludge biochar activated sludge under different pyrolysis conditions is shown in Table 3.
表3table 3
热解温度(℃)Pyrolysis temperature (℃) 300300 400400 500500 500500 600600 800800 900900
热解时间(h)Pyrolysis time (h) 44 33 33 22 22 22 11
活性污泥含水率(％)Moisture content of activated sludge (%) 72.5472.54 65.1665.16 64.4864.48 61.9261.92 63.4363.43 69.8969.89 71.2471.24
由表3可以得出，在pH值为3的活性污泥中，经过热解条件为500℃～600℃热解2h得到的污泥生物炭处理的活性污泥含水率较小，热解条件为500℃热解2h得到的污泥生物炭，活性污泥脱水效果最好。It can be concluded from Table 3 that in the activated sludge with a pH value of 3, the activated sludge treated with biochar after pyrolysis at 500℃～600℃ for 2h has a lower moisture content, and the pyrolysis conditions The activated sludge dehydration effect is the best for the sludge biochar obtained by pyrolysis at 500°C for 2h.
实施例4Example 4
量取pH值为4的100mL的活性污泥6份，分别加入0.06g、0.1g、0.15g、0.2g、0.25g和0.3g的高铁酸钾以200rpm的搅拌速度搅拌5min，搅拌完成后，静置30min后，对其进行脱水处理，得到污泥脱水率，不同质量的高铁酸钾活性污泥的脱水率如表4所示。Measure 6 parts of 100mL activated sludge with a pH of 4, add 0.06g, 0.1g, 0.15g, 0.2g, 0.25g and 0.3g potassium ferrate and stir for 5min at a stirring speed of 200rpm. After the stirring is completed, After standing for 30 minutes, it was dehydrated to obtain the sludge dehydration rate. The dehydration rate of potassium ferrate activated sludge of different quality is shown in Table 4.
表4Table 4
高铁酸钾(g)Potassium Ferrate (g) 0.060.06 0.10.1 0.150.15 0.20.2 0.250.25 0.30.3
活性污泥含水率(％)Moisture content of activated sludge (%) 70.970.9 66.566.5 64.364.3 59.159.1 5959 58.758.7
由表4可以得出，在pH值为3的活性污泥中，高铁酸钾的投加量为0.2～0.3g时的活性污泥含水率较小，每100mL的活性污泥中加入0.3g高铁酸钾时活性污泥脱水效果最好。It can be concluded from Table 4 that in the activated sludge with a pH of 3, when the dosage of potassium ferrate is 0.2～0.3g, the water content of the activated sludge is relatively small, 0.3g is added to every 100mL of activated sludge The dewatering effect of activated sludge is best when potassium ferrate is used.
实施例5Example 5
将市政污泥泥饼先进行手动剔除固体杂质后，置于烘箱105℃干燥至恒重后取出，进行粉碎处理并过筛，得到预处理后的市政污泥，然后将预处理后的市政污泥在惰性气体氛围下 600℃热解2h后得到污泥生物炭。After the municipal sludge cake is manually removed from solid impurities, it is placed in an oven at 105°C to be dried to a constant weight and then taken out, crushed and sieved to obtain the pretreated municipal sludge, and then the pretreated municipal sludge The sludge is pyrolyzed at 600°C under inert gas atmosphere for 2h to obtain sludge biochar.
量取pH值为3的100mL的活性污泥6份，将不同质量的高铁酸钾加入到活性污泥中(高铁酸钾的质量如表5所示)，以200rpm的搅拌速度搅拌5min后，再将不同质量的污泥生物炭投加到活性污泥中(污泥生物炭的质量如表5所示)，再以100rpm的搅拌速度搅拌5min后，静置120min，其进行脱水处理，得到污泥脱水率，不同质量的污泥生物炭活性污泥的脱水率如表5所示。Measure 6 parts of 100mL activated sludge with a pH of 3, add different quality potassium ferrate to the activated sludge (the quality of potassium ferrate is shown in Table 5), stir at 200rpm for 5 minutes, Then put different quality of sludge biochar into the activated sludge (the quality of sludge biochar is shown in Table 5), then stir at 100rpm stirring speed for 5min, then let it stand for 120min, it is dehydrated to obtain Sludge dewatering rate, the dewatering rate of sludge biochar activated sludge of different quality is shown in Table 5.
以活性污泥直接脱水作为对比例1，具体步骤为量取pH值为3的100mL活性污泥；将活性污泥在300rpm的搅拌速度下搅拌2min，再在100rpm的搅拌速度下搅拌5min，搅拌完成后，将活性污泥静置30min，再对其进行脱水处理。Direct dehydration of activated sludge is used as Comparative Example 1. The specific steps are to measure 100 mL of activated sludge with a pH of 3; stir the activated sludge for 2 minutes at a stirring speed of 300 rpm, and then stir for 5 minutes at a stirring speed of 100 rpm. After completion, the activated sludge was allowed to stand for 30 minutes, and then dehydrated.
以市购的絮凝剂产品阳离子型聚丙烯酰胺作为对比例2，量取pH值为3的100mL活性污泥，将0.4g阳离子型聚丙烯酰胺投加到活性污泥以300rpm搅拌速度搅拌2min，再100rpm搅拌5min；搅拌完成后，将污泥静置30min，再对其进行脱水处理。Take a commercially available flocculant product cationic polyacrylamide as Comparative Example 2, measure 100 mL of activated sludge with a pH of 3, add 0.4 g of cationic polyacrylamide to the activated sludge and stir at 300 rpm for 2 minutes. Stir at 100 rpm for 5 minutes; after the stirring is completed, let the sludge stand for 30 minutes, and then dehydrate it.
表5table 5
高铁酸钾(g)Potassium Ferrate (g) 0.30.3 0.30.3 0.30.3 0.30.3 0.30.3 0.030.03 0.030.03
污泥生物炭(g)Sludge biochar (g) 0.20.2 0.40.4 0.60.6 0.80.8 1.01.0 1.251.25 1.301.30
活性污泥含水率(％)Moisture content of activated sludge (%) 68.1368.13 63.3663.36 61.7461.74 59.9859.98 53.953.9 58.7658.76 64.3164.31
对比例1活性污泥直接脱水后，污泥的含水率为83.32％，对比例2采用的阳离子型聚丙烯酰胺的含水率为78.93％，由表5可以得出，污泥生物炭协同高铁酸钾共同调理污泥效果优于污泥生物炭单独调理，协同调理后泥饼含水率最优效果为53.9％。该值远远低于直接脱水的活性污泥泥饼含水率及目前污水处理厂采用的阳离子型聚丙烯酰胺的含水率。本发明提供 的污泥调理剂具有优异的脱水效果，能够高效的去除污泥泥饼中的含水率，活性污泥脱水效果最好。After the activated sludge of Comparative Example 1 is directly dehydrated, the water content of the sludge is 83.32%, and the water content of the cationic polyacrylamide used in Comparative Example 2 is 78.93%. It can be concluded from Table 5 that the sludge biochar synergizes with ferric acid The effect of potassium co-conditioning of sludge is better than that of sludge biochar alone, and the optimal effect of mud cake moisture content after co-conditioning is 53.9%. This value is far lower than the moisture content of the directly dehydrated activated sludge cake and the moisture content of the cationic polyacrylamide currently used in sewage treatment plants. The sludge conditioner provided by the present invention has an excellent dehydration effect, can efficiently remove the water content in the sludge cake, and has the best activated sludge dehydration effect.
上列详细说明是针对本发明之一可行实施例的具体说明，该实施例并非用以限制本发明的专利范围，凡未脱离本发明所为的等效实施或变更，均应包含于本案的专利范围中。The above detailed description is a specific description of a feasible embodiment of the present invention. This embodiment is not intended to limit the scope of the present invention. Any equivalent implementation or modification that does not deviate from the present invention should be included in this case. In the scope of the patent.

Claims (9)

  1. 一种新型市政污泥调理剂，其特征在于，包括污泥生物炭和高铁酸盐，所述的污泥生物炭和高铁酸盐的质量比为2～130:3，所述的污泥生物炭由如下步骤制备得到，将预处理后的市政污泥在惰性气体氛围下300℃～900℃热解1～4h后得到污泥生物炭。A new type of municipal sludge conditioner, which is characterized in that it comprises sludge biochar and ferrate, the mass ratio of the sludge biochar and ferrate is 2 to 130:3, and the sludge biological The charcoal is prepared by the following steps. The pretreated municipal sludge is pyrolyzed at 300°C to 900°C under an inert gas atmosphere for 1 to 4 hours to obtain sludge biochar.
  2. 根据权利要求1所述的新型市政污泥调理剂，其特征在于，所述的高铁酸盐为高铁酸钾。The new municipal sludge conditioner according to claim 1, wherein the ferrate is potassium ferrate.
  3. 根据权利要求1所述的新型市政污泥调理剂，其特征在于，步骤(1)所述的预处理后的市政污泥的预处理的具体步骤如下：将污泥泥饼先进行手动剔除固体杂质后，置于烘箱105℃干燥至恒重后取出，用粉碎机进行粉碎处理并过筛，得到预处理后的市政污泥。The new municipal sludge conditioner according to claim 1, characterized in that the specific steps of the pretreatment of the pretreated municipal sludge in step (1) are as follows: the sludge cake is first manually removed from solids After the impurities are placed in an oven at 105°C to be dried to a constant weight, they are taken out, crushed with a pulverizer and sieved to obtain pretreated municipal sludge.
  4. 根据权利要求1或3所述的新型市政污泥调理剂，其特征在于，将预处理后的市政污泥在惰性气体氛围下500℃～600℃热解2h后得到污泥生物炭。The new municipal sludge conditioner according to claim 1 or 3, characterized in that the pretreated municipal sludge is pyrolyzed in an inert gas atmosphere at 500°C to 600°C for 2 hours to obtain sludge biochar.
  5. 根据权利要求1所述的新型市政污泥调理剂，其特征在于，所述的污泥生物炭和高铁酸盐的质量比为8～125:3。The new municipal sludge conditioner according to claim 1, wherein the mass ratio of the sludge biochar and ferrate is 8 to 125:3.
  6. 权利要求1所述的新型市政污泥调理剂在污泥脱水中的应用。Application of the new municipal sludge conditioner of claim 1 in sludge dewatering.
  7. 根据权利要求6所述的新型市政污泥调理剂在污泥脱水中的应用，其特征在于，包括如下步骤：将高铁酸盐加入到活性污泥中，以100～300rpm的搅拌速度搅拌1～10min后，再将污泥生物炭投加到活性污泥中，再以50～100rpm的搅拌速度搅拌5～30min后，静止0～120min，并记录静置沉降情况，经脱水处理，得到污泥脱水率。The application of the new municipal sludge conditioner in sludge dewatering according to claim 6, characterized in that it comprises the following steps: adding ferrate to the activated sludge and stirring at a stirring speed of 100 to 300 rpm for 1 to After 10 minutes, the sludge biochar was added to the activated sludge, and then stirred at a stirring speed of 50-100 rpm for 5-30 minutes, then stood still for 0-120 minutes, and recorded the standing settlement conditions. After dehydration treatment, the sludge was obtained Dehydration rate.
  8. 根据权利要求7所述的新型市政污泥调理剂在污泥脱水中的应用，其特征在于，所述的活性污泥的pH值为2～7。The application of the new municipal sludge conditioner in sludge dewatering according to claim 7, characterized in that the pH of the activated sludge is 2-7.
  9. 根据权利要求7所述的新型市政污泥调理剂在污泥脱水中的应用，其特征在于，每100 mL活性污泥中加入0.06～0.3g的高铁酸盐，每100mL活性污泥中加入0.25～1.30g的污泥生物炭。The application of the new municipal sludge conditioner in sludge dewatering according to claim 7, characterized in that 0.06-0.3g of ferrate is added to every 100 mL of activated sludge, and 0.25 to every 100 mL of activated sludge is added ~ 1.30g of sludge biochar.
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