CN106830587A - It is a kind of to strengthen the method for explaining phosphorus containing solid sludge high temperature hot water high - Google Patents
It is a kind of to strengthen the method for explaining phosphorus containing solid sludge high temperature hot water high Download PDFInfo
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 85
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 85
- 239000011574 phosphorus Substances 0.000 title claims abstract description 85
- 239000010802 sludge Substances 0.000 title claims abstract description 81
- 239000007787 solid Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 7
- 239000007800 oxidant agent Substances 0.000 claims abstract description 22
- 238000009283 thermal hydrolysis Methods 0.000 claims abstract description 18
- 230000001590 oxidative effect Effects 0.000 claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 238000005728 strengthening Methods 0.000 claims abstract description 6
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 5
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 150000007522 mineralic acids Chemical class 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims abstract 2
- 230000002378 acidificating effect Effects 0.000 claims description 4
- 239000005416 organic matter Substances 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 230000027756 respiratory electron transport chain Effects 0.000 claims description 2
- 239000013043 chemical agent Substances 0.000 claims 1
- 238000002156 mixing Methods 0.000 abstract description 3
- 230000020477 pH reduction Effects 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- -1 H 2 O 2 Chemical compound 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 230000029087 digestion Effects 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 239000010865 sewage Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000009388 chemical precipitation Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000000855 fermentation Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000009089 cytolysis Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000002367 phosphate rock Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011978 dissolution method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009294 enhanced biological phosphorus removal Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 159000000014 iron salts Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 244000045947 parasite Species 0.000 description 1
- DJFBJKSMACBYBD-UHFFFAOYSA-N phosphane;hydrate Chemical compound O.P DJFBJKSMACBYBD-UHFFFAOYSA-N 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000001226 reprecipitation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
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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
-
- 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
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
本发明涉及一种强化高含固污泥高温热水解释磷的方法，属于污泥处置与资源化处理领域。包括如下步骤：将不含有Cr、Mn等有害重金属，也不含有铁等易于与磷产生沉淀的氧化剂，如H2O2、KClO3等与特定质量的高含固污泥在热水解浆化罐内混合10‑15min，并投加无机酸调节污泥pH为5.5‑6.5之间。混合均匀后将污泥预热至70℃以上，置于高温热水解处理装置，使系统温度上升至120‑170℃之间。保持温度时间为20‑40min，然后泄压闪蒸。本发明用投加强氧化剂并结合酸化的方法来强化高温热水解的释磷，增强了有机磷向无机磷的转化率，提高磷释放效率。方法简单易行，是污泥和磷元素资源化的一种有效手段。
The invention relates to a method for strengthening high-temperature hot water interpretation of phosphorus from high-solid sludge, and belongs to the field of sludge disposal and resource treatment. It includes the following steps: thermally hydrolyze slurry with high-solid sludge of a specific quality that does not contain harmful heavy metals such as Cr and Mn, and does not contain oxidants such as iron that are easy to precipitate with phosphorus, such as H 2 O 2 , KClO 3 , etc. Mix in the chemical tank for 10-15 minutes, and add inorganic acid to adjust the sludge pH to 5.5-6.5. After mixing evenly, preheat the sludge to above 70°C and place it in a high-temperature thermal hydrolysis treatment device to raise the system temperature to between 120‑170°C. Keep the temperature for 20-40 minutes, then release the pressure and flash. The invention strengthens the release of phosphorus by high-temperature thermal hydrolysis by adding a strengthening oxidant combined with acidification, enhances the conversion rate of organic phosphorus to inorganic phosphorus, and improves the efficiency of phosphorus release. The method is simple and easy to implement, and is an effective means for recycling sludge and phosphorus elements.
Description
技术领域technical field
本发明属于污泥处置与资源化处理领域，尤其是涉及到一种强化高含固污泥高温热水解释磷的方法。The invention belongs to the field of sludge disposal and resource treatment, and in particular relates to a method for strengthening high-temperature hot water interpretation of phosphorus from high-solid sludge.
背景技术Background technique
磷是一种难以再生的非金属矿资源，参与动植物生命活动，在工农业中具有重要的利用价值。磷矿已被列为我国2010年后不能满足国民经济发展需要的20种矿产之一。另一方面，污泥是污水处理的产物，近几年我国污水厂的剧增导致污泥产量呈爆炸性增长。据估计，2020年底城市湿污泥产生量会突破6000万吨。污泥中富集的氮、磷浓度远高于一般污/废水，如普通剩余污泥中磷的含量约为1%-3%，采用强化生物除磷工艺可达6%-12%，这为磷的回收利用提供了可能，使污泥成为一种潜在的可循环磷矿资源。但由于剩余污泥中的磷除了无机磷外，还含有有机磷（占10%-35%），此外还有细菌、寄生虫和重金属等有毒有害物质，直接回收困难且存在一定风险。因此，污泥中磷的回收需要先将污泥中的磷释放到上清液中，然后再通过物理、化学等方法回收。Phosphorus is a non-metallic mineral resource that is difficult to regenerate. It participates in the life activities of animals and plants and has important utilization value in industry and agriculture. Phosphate rock has been listed as one of the 20 kinds of minerals that cannot meet the needs of national economic development after 2010. On the other hand, sludge is a product of sewage treatment. In recent years, the rapid increase of sewage plants in my country has led to explosive growth of sludge production. It is estimated that by the end of 2020, the generation of urban wet sludge will exceed 60 million tons. The concentration of nitrogen and phosphorus enriched in sludge is much higher than that of general sewage/wastewater. For example, the phosphorus content in ordinary residual sludge is about 1%-3%, and the enhanced biological phosphorus removal process can reach 6%-12%. It provides the possibility for the recovery and utilization of phosphorus, making sludge a potential recyclable phosphate rock resource. However, since the phosphorus in the remaining sludge contains not only inorganic phosphorus but also organic phosphorus (accounting for 10%-35%), and poisonous and harmful substances such as bacteria, parasites and heavy metals, it is difficult to directly recover and there are certain risks. Therefore, the recovery of phosphorus in the sludge needs to release the phosphorus in the sludge into the supernatant first, and then recover it by physical and chemical methods.
目前释磷的方法有厌氧消化、臭氧氧化、热处理法、酸、碱溶胞法、超声波溶胞法等。与其相关的专利较少，大多集中在提高含水率较高的污泥厌氧消化释磷效果方面，如“提高含磷化学一生物混合污泥厌氧发酵释磷率的方法”（专利申请号：201410120041.4），此发明方法一方面能够防止污泥厌氧发酵过程中释出的磷再沉淀，另一方面促进化学除磷产生的化学污泥释磷；“一种高压脉冲预处理技术强化剩余污泥梯级释磷的方法”（专利申请号：201510325532.7），主要是针对传统污泥厌氧消化中存在的不足，通过高压脉冲预处理剩余污泥，提高污泥可生化性，促进后续厌氧发酵磷释放进行，实现城市污水处理厂污泥的减量化、资源化。在众多释磷方法中，热处理法释磷效果好，时间短，成为目前的研究热点，分为光波加热法、焚烧溶出法、低温热处理、高温热处理等。At present, methods for phosphorus release include anaerobic digestion, ozone oxidation, heat treatment, acid and alkali lysis, ultrasonic lysis, etc. There are few patents related to it, most of which focus on improving the phosphorus release effect of anaerobic digestion of sludge with high water content, such as "Methods for Improving the Phosphorus Release Rate of Phosphorus-Containing Chemical-Biological Mixed Sludge Anaerobic Fermentation" (Patent Application No. : 201410120041.4), on the one hand, this inventive method can prevent the re-precipitation of phosphorus released during sludge anaerobic fermentation, and on the other hand, promote the release of phosphorus from chemical sludge produced by chemical phosphorus removal; "a high-voltage pulse pretreatment technology strengthens the residual Sludge Cascade Phosphorus Release Method” (patent application number: 201510325532.7), mainly aimed at the deficiencies in traditional sludge anaerobic digestion, pretreatment of remaining sludge through high-pressure pulses, improving sludge biodegradability, and promoting subsequent anaerobic digestion Fermentation phosphorus is released to realize the reduction and recycling of sludge in urban sewage treatment plants. Among the many phosphorus release methods, the heat treatment method has good phosphorus release effect and short time, and has become a current research hotspot. It is divided into light wave heating method, incineration and dissolution method, low temperature heat treatment, high temperature heat treatment and so on.
相比低温加热法，高温热水解有较佳的释磷效果，且该方法可以直接应用于含固率超过10%的污泥，从而降低磷浓度，便于后续磷的回收。Ahamd等实验表明污泥在较高的温度和较低的pH处理下具有更高的释磷量，170℃下加热80min释磷量达到最大值48.9mg/L。卓杨等在165℃下处理污水厂的脱水污泥50min，水解液的溶解态总磷由0.24g/L增至0.81g/L，磷酸盐由0.05g/L增至0.70g/L，磷酸盐占溶解态总磷的79.84%。Antonio等在120℃下加热污泥15min，磷释放量增加了24%。但常规高温热水解存在加热过程中耗能较大，有机磷释放不彻底等明显缺点，此外，经过高温热水解后污泥的pH呈中性微酸性，而高含固污泥是经过投加各种脱水调理剂如铁盐等脱水而得，因此污泥中的磷很多以化学沉淀形式存在，难以溶解释放，成为限制该方法生产应用的瓶颈，因此有必要开发一种能能耗较低且能够有效释放污泥中磷和有机磷的强化释磷方法。Compared with the low-temperature heating method, high-temperature thermal hydrolysis has a better phosphorus release effect, and this method can be directly applied to sludge with a solid content of more than 10%, thereby reducing the phosphorus concentration and facilitating subsequent phosphorus recovery. Experiments by Ahamd et al. showed that sludge had a higher phosphorus release amount under higher temperature and lower pH treatment, and the phosphorus release amount reached a maximum of 48.9mg/L when heated at 170°C for 80 minutes. Zhuo Yang et al. treated the dewatered sludge of the sewage plant at 165°C for 50 minutes, the dissolved total phosphorus in the hydrolyzed solution increased from 0.24g/L to 0.81g/L, and the phosphate increased from 0.05g/L to 0.70g/L. Salt accounted for 79.84% of the total dissolved phosphorus. Antonio et al. heated the sludge at 120°C for 15 minutes, and the phosphorus release increased by 24%. However, conventional high-temperature thermal hydrolysis has obvious disadvantages such as large energy consumption in the heating process and incomplete release of organic phosphorus. In addition, the pH of sludge after high-temperature thermal hydrolysis is neutral and slightly acidic, while high-solid sludge is processed It is obtained by dehydration by adding various dehydration conditioners such as iron salts, etc. Therefore, a lot of phosphorus in the sludge exists in the form of chemical precipitation, which is difficult to dissolve and release, which has become a bottleneck restricting the production and application of this method. Therefore, it is necessary to develop an energy-saving method. An enhanced phosphorus release method that is low and can effectively release phosphorus and organic phosphorus in sludge.
发明内容Contents of the invention
本发明目的在于提供一种强化高含固污泥高温热水解释磷的方法，进一步提高高温热水解过程的释磷效率，减少能耗，为后续的磷回收奠定基础。The purpose of the present invention is to provide a method for strengthening high-temperature hot water desorption of high-solid sludge, further improving the phosphorus release efficiency in the high-temperature thermal hydrolysis process, reducing energy consumption, and laying a foundation for subsequent phosphorus recovery.
本发明提出的一种强化高含固污泥高温热水解释磷的方法，具体步骤如下：A kind of method that the present invention proposes strengthens the high-temperature hot water of high-solid sludge to explain phosphorus, and concrete steps are as follows:
（１）选取含固率为8%-20%的高含固污泥，选取不含有Cr、Mn等有害重金属，也不含有铁等易于与磷产生沉淀的氧化剂，将所述氧化剂与高含固污泥在热水解浆化罐内混合10-15min，并投加无机酸调节高含固污泥的pH值为5.5-6.5，高含固污泥与氧化剂的化学剂投加量按照如下公式计算：(1) Select high-solid sludge with a solid content rate of 8%-20%, select no harmful heavy metals such as Cr and Mn, and do not contain oxidants such as iron that are easy to precipitate with phosphorus, and mix the oxidant with high-content sludge. The solid sludge is mixed in the thermal hydrolysis pulping tank for 10-15 minutes, and inorganic acid is added to adjust the pH value of the high-solid sludge to 5.5-6.5. The chemical dosage of high-solid sludge and oxidant is as follows Formula calculation:
x=a*m*1000*（1-y）/31*8/b*c*ηx=a*m*1000*(1-y)/31*8/b*c*η
a:高含固污泥中总磷的含量，g/kgDS，x:氧化剂投加量（g）；m：高含固污泥（kg）； y：污泥含水率（%）；b：所投加氧化剂被还原后的电子转移数；c：所投加氧化剂摩尔质量（g）；η：百分率，为5%-40%；a: total phosphorus content in high-solid sludge, g/kgDS, x: oxidant dosage (g); m: high-solid sludge (kg); y: sludge moisture content (%); b: The electron transfer number of the added oxidant after being reduced; c: the molar mass of the added oxidant (g); η: the percentage, which is 5%-40%;
（２）将步骤（１）混合均匀后预热至70℃以上，置于高温热水解处理装置内，用热蒸汽对反应罐内高含固污泥进行加热加压，使高温热水解处理装置内温度上升至120-170℃，在此温度下保持20-40min；(2) Mix the step (1) evenly, preheat to above 70°C, place it in a high-temperature thermal hydrolysis treatment device, and use hot steam to heat and pressurize the high-solid sludge in the reaction tank to make the high-temperature thermal hydrolysis process The temperature in the processing device rises to 120-170°C and is kept at this temperature for 20-40min;
（３）将步骤（２）所得产物泄压闪蒸，在此过程使高含固污泥中絮体结构破坏，不溶态物质转变为溶解态，将高含固污泥细胞中无机磷和有机磷等释放出来，然后在氧化剂存在的条件下，将有机磷氧化为无机磷，同时在酸性条件下，高含固污泥中存在的化学磷也可以被溶解释放，从而提高污泥中磷的释放效率，并提高磷的释放程度。(3) The product obtained in step (2) is depressurized and flashed. During this process, the floc structure in the high-solid sludge is destroyed, the insoluble matter is transformed into a dissolved state, and the inorganic phosphorus and organic matter in the high-solid sludge cells are dissolved. Release phosphorus, etc., and then oxidize organic phosphorus to inorganic phosphorus in the presence of oxidants. At the same time, under acidic conditions, chemical phosphorus in high-solid sludge can also be dissolved and released, thereby increasing the concentration of phosphorus in sludge. Release efficiency, and increase the degree of phosphorus release.
本发明中，步骤（１）中所述氧化剂为H2O2或KClO3等，不含有Cr、Mn等有害重金属，也不含有铁等易于与磷产生沉淀的氧化剂中任一种。In the present invention, the oxidizing agent in step (1) is H 2 O 2 or KClO 3 , etc., which does not contain harmful heavy metals such as Cr and Mn, and does not contain any of the oxidizing agents that are easy to precipitate with phosphorus such as iron.
本发明用投加强氧化剂并结合酸化的方法来强化高温热水解的释磷，增强了有机磷向无机磷的转化率，提高磷释放效率。方法简单易行，为后续的磷的回收奠定基础。The invention strengthens the release of phosphorus by high-temperature thermal hydrolysis by adding a strengthening oxidant combined with acidification, enhances the conversion rate of organic phosphorus to inorganic phosphorus, and improves the efficiency of phosphorus release. The method is simple and easy, and lays the foundation for subsequent phosphorus recovery.
本发明专利具有如下优势：The invention patent has the following advantages:
1. 提高污泥中磷的释放效率。高含固污泥中磷主要以无机磷（包括化学沉淀磷）形式存在，此外含有10%-35%的有机磷。加入的强氧化剂可以使污泥中有机磷转化为无机磷释放，同时在酸性条件下也有利于溶解污泥中化学沉淀磷，从而提高污泥中磷的释放量。1. Improve the release efficiency of phosphorus in sludge. Phosphorus in high-solid sludge mainly exists in the form of inorganic phosphorus (including chemical precipitation phosphorus), and contains 10%-35% organic phosphorus. The added strong oxidant can convert the organic phosphorus in the sludge into inorganic phosphorus and release it. At the same time, it is also beneficial to dissolve the chemical precipitation of phosphorus in the sludge under acidic conditions, thereby increasing the release of phosphorus in the sludge.
2. 该法简单易行，利于和现在高含固污泥处理处置正在应用的“高温热水解+厌氧消化”结合应用，因此不需要增加额外设备，且除了增加适量氧化剂和无机酸外，不需要增加其他能耗。2. This method is simple and easy to implement, and it is beneficial to combine with the current application of "high temperature thermal hydrolysis + anaerobic digestion" in the treatment and disposal of high-solids sludge. Therefore, no additional equipment is required, and in addition to adding an appropriate amount of oxidant and inorganic acid , no need to increase other energy consumption.
3. 该发明是污泥和磷元素资源化的一种有效手段。通过强化方法，可以将高含固污泥中磷充分释放，为污泥中磷的资源化利用提供了一种新的思路和方法。3. The invention is an effective means for resource utilization of sludge and phosphorus. Through the enhanced method, the phosphorus in the high-solid sludge can be fully released, which provides a new idea and method for the resource utilization of phosphorus in the sludge.
附图说明Description of drawings
图1 强化高含固污泥热水解释磷方法示意图。Fig. 1 Schematic diagram of the enhanced hot water phosphorus interpretation method for high-solids sludge.
具体实施方式detailed description
下面通过实施例进一步说明本发明。The present invention is further illustrated below by way of examples.
实施例1：Example 1:
将含固率为8%的高含固污泥，投加KClO3占总磷的5%，混合10min，并投加HCl调节混合物pH为5.5，混合均匀后污泥预热至70℃，置于高温热水解处理装置，用热蒸汽对反应罐内污泥进行加热加压，使系统温度上升至120℃。保持温度时间为20min，然后泄压闪蒸，最后比没有投加KClO3且没有调节pH的同等热水解条件下污泥中磷释放率提高10%。Add KClO 3 to the high-solid sludge with a solid content rate of 8%, accounting for 5% of the total phosphorus, mix for 10 minutes, and add HCl to adjust the pH of the mixture to 5.5. After mixing evenly, the sludge is preheated to 70°C and placed In the high-temperature thermal hydrolysis treatment device, hot steam is used to heat and pressurize the sludge in the reaction tank to raise the system temperature to 120°C. The temperature was maintained for 20 minutes, and then the pressure was released and flashed. Finally, the release rate of phosphorus in the sludge was increased by 10% compared with the same thermal hydrolysis conditions without adding KClO 3 and without adjusting the pH.
实施例2：Example 2:
将含固率为20%的高含固污泥，投加H2O2占总磷的40%，混合15min，并投加HCl调节混合物pH为6.5，混合均匀后污泥预热至90℃，置于高温热水解处理装置，用热蒸汽对反应罐内污泥进行加热加压，使系统温度上升至170℃。保持温度时间为40min，然后泄压闪蒸，最后比没有投加H2O2且没有调节pH的同等热水解条件下污泥中磷释放率提高7%。Add H 2 O 2 to the high-solid sludge with a solid content of 20% accounting for 40% of the total phosphorus, mix for 15 minutes, and add HCl to adjust the pH of the mixture to 6.5. After mixing evenly, the sludge is preheated to 90°C , placed in a high-temperature thermal hydrolysis treatment device, heat and pressurize the sludge in the reaction tank with hot steam, and raise the system temperature to 170°C. The temperature was maintained for 40 minutes, and then the pressure was released and flashed. Finally, the release rate of phosphorus in the sludge increased by 7% compared with the same thermal hydrolysis conditions without adding H 2 O 2 and without adjusting the pH.
如上所述，本发明是按照目前认为是最实际和优选的实施进行描述，但不局限于上述的实施方法，而应当涵盖包括在所附权利要求的精神和范围之内的各种修改和等价设计。As mentioned above, the present invention has been described according to what is considered to be the most practical and preferred implementation at present, but is not limited to the above-mentioned implementation method, but should cover various modifications and the like within the spirit and scope of the appended claims. price design.
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