CN114956499B - Ozonization conditioning coupling hydrothermal rapid stabilization treatment process for organic sludge - Google Patents

Ozonization conditioning coupling hydrothermal rapid stabilization treatment process for organic sludge Download PDF

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CN114956499B
CN114956499B CN202210472094.7A CN202210472094A CN114956499B CN 114956499 B CN114956499 B CN 114956499B CN 202210472094 A CN202210472094 A CN 202210472094A CN 114956499 B CN114956499 B CN 114956499B
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ozone
sludge
thermal hydrolysis
dissolved air
ozonization
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CN114956499A (en
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董滨
王慧
陈江峰
陈仁杰
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Tongji University
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Tongji University
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/76—Gas phase processes, e.g. by using aerosols
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/10—Oxidants
    • B01D2251/104—Ozone
    • 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
    • Y02W10/20—Sludge processing

Abstract

The invention discloses an ozonization conditioning coupling hydrothermal rapid stabilization treatment process for organic sludge, which comprises the steps of stirring and homogenizing the sludge, sucking a sludge water mixture into a pressurized ozone dissolved air floatation device, adding a cationic PAM reagent to complete ozone dissolved air release and slag scraping operation, enabling ozone-containing microbubble scum to enter a thermal hydrolysis reaction kettle, breaking the wall of the sludge through thermal hydrolysis, and achieving the sludge stabilization standard after solid-liquid separation. According to the invention, the thermal hydrolysis is transferred from the traditional front-end pretreatment process to the core treatment unit for realizing sludge stabilization, the process realizes that the non-condensable gas generated by the thermal hydrolysis is directly deodorized, and the problem that the non-condensable odor of the traditional thermal hydrolysis reaction gas is difficult to treat is avoided. The invention combines the physical and chemical properties of the sludge, efficiently couples the sludge treatment process, fully plays the catalytic oxidation effect of ozone, and truly realizes the targets of sludge treatment reduction, harmlessness and recycling under the environment of low carbon and low cost.

Description

Ozonization conditioning coupling hydrothermal rapid stabilization treatment process for organic sludge
Technical Field
The invention belongs to the technical field of organic solid waste treatment and recycling, and particularly relates to an ozonization conditioning coupling hydrothermal rapid stabilization treatment process for organic sludge.
Background
The sludge receives pollutants in the sewage, and is a continuation and necessary requirement of the sewage treatment process. The sludge treatment method is not suitable for the foreign common sludge treatment processes such as anaerobic digestion and the like for the sludge treatment with the characteristics of low organic matter content, high content of superfine sand and metal, long sludge age and the like. For high sand content and low organic matters (the organic matter content is lower than 45 percent), the traditional sludge treatment and disposal technical route needs to be adjusted. The thermal hydrolysis is generally used as the front end of the traditional sludge treatment technology route, the sludge after thermal hydrolysis is unstable, and further stabilization is needed in the subsequent processes such as anaerobic digestion, aerobic fermentation and the like. Therefore, the investment cost, the operation and maintenance cost and the dosing cost are huge, and the technical route of sludge stabilization can not break through the traditional technical barriers.
Compared with anaerobic digestion technology, the aerobic fermentation technology has relatively low investment cost and operation and maintenance difficulty, and has more engineering practice cases. In practical engineering application, the restriction factors faced by the sludge aerobic fermentation technology mainly comprise the following three points: (1) The odor control difficulty is high, the cost is high, and the cheap and reliable odor control technology is lacking in the aerobic fermentation process; (2) The aerobic fermentation needs a stable conditioner source, and the supply of the traditional conditioner is limited by seasons and regions; (3) The sludge aerobic fermentation product has unsmooth outlet, the land utilization of the sludge product is lack of planning, and the sludge aerobic fermentation product possibly has environmental risks and occupies larger land. Therefore, aiming at the efficient coupling of the low-organic matter high-sand-content sludge treatment technology, an effective treatment process needs to be developed.
Disclosure of Invention
The invention aims to solve the problems and provide the ozonization conditioning coupling hydrothermal rapid stabilization treatment process for the organic sludge, which solves the problems of large investment, complex process, high operation and maintenance cost and the like of the traditional process.
The aim of the invention is achieved by the following technical scheme:
an ozonization conditioning coupling hydrothermal rapid stabilization treatment process for organic sludge comprises the steps of stirring and homogenizing sludge, sucking a sludge water mixture into a pressurized ozone dissolved air floatation device, adding a cationic PAM medicament, completing ozone dissolved air release and slag scraping operation, enabling ozone-containing micro-bubble scum to enter a thermal hydrolysis reaction kettle, breaking walls of the sludge through thermal hydrolysis, and achieving a sludge stabilization standard after solid-liquid separation.
Further, the sludge is sludge of a town sewage treatment plant with high sand content and organic matters lower than 45%, and the concentration range of solid suspended matters is 8000-12000 mg/L.
Further, the ozone dissolved gas releasing and slag scraping operations are finished in batches, and the batch finishing time is less than or equal to 10 minutes.
Further, the scum containing ozone micro-bubbles enters a thermal hydrolysis reaction kettle through a pipeline booster pump.
Further, the ozone dissolved air floatation device and the thermal hydrolysis reaction kettle are both closed micro negative pressure devices,
the upper part of the ozone dissolved air floatation device is connected with an arch-shaped connected pipeline, the upper part of the thermal hydrolysis reaction kettle is connected with an exhaust pipeline, the exhaust pipeline is used for extracting mixed waste gas containing high-concentration ozone, the air floatation device adopts the arch-shaped connected pipeline above to uniformly extract, an arch-shaped circular pipe is adopted to promote vapor condensation, a scraping plate directly scrapes scum with high water content to a collecting tank, and the collecting tank enters the thermal hydrolysis reaction kettle according to set logic;
the arch-shaped row pipeline and the gas pipeline are connected with the ozone digestion chamber, the ozone digestion chamber is connected with the ozone advanced treatment chamber, and the ozone advanced treatment chamber is an acid liquid pool with pH=5.
Further, the effective water depth in the ozone dissolved air floatation device is 1.8-2 m, the hydraulic retention time of the contact chamber is 1.2-1.5 min, the hydraulic retention time of the separation chamber is not more than 8min, and the surface load of the separation chamber is 6-8 m 3 /(m 2 And/h), the working pressure of the ozone dissolved air tank is 0.6Mpa, and the dissolved air water is tap water or effluent of urban sewage treatment plants.
Further, the cationic PAM is configured in a mass ratio of 4-5%.
Further, the pressurized ozone dissolved air floatation device injects ozone at the temperature of 100 ℃, and the addition amount of the ozone in the wastewater is 8-10mg/L.
Further, the ozone content of the mixed waste gas of high-concentration ozone generated by the pressurized ozone dissolved air floatation device is 15-27mg/L, and the treatment efficiency of the mixed waste gas on odor, methyl mercaptan and the like generated by thermal hydrolysis is over 90 percent.
Further, the thermal hydrolysis reaction temperature in the thermal hydrolysis reaction kettle is 180-200 ℃.
Compared with the prior art, the invention has the following beneficial effects:
1. the thermal hydrolysis is generally used as the front end of the traditional sludge treatment technology route, the sludge after thermal hydrolysis is unstable, and further stabilization is needed in the subsequent processes such as anaerobic digestion, aerobic fermentation and the like. Therefore, the investment cost, the operation and maintenance cost and the dosing cost are huge, and the technical route of sludge stabilization can not break through the traditional technical barriers. The invention simplifies the technical route of sludge stabilization by taking the characteristics of sludge as a break, and provides a new solving route for low-organic sludge through parameter control.
2. The thermal hydrolysis can generate odor, methyl mercaptan and other odor, and the odor problem caused by the thermal hydrolysis has great influence on human health, factory and surrounding environment, and the thermal hydrolysis project must be matched with odor treatment facilities. The invention omits the investment and maintenance cost of the odor treatment facility, combines the high-content ozone mixed waste gas of the front-end high-capacity pressurized ozone dissolved air floatation with the pyrohydrolysis odor, can solve the problem of difficult treatment of the pyrohydrolysis non-condensable odor, and simultaneously reduces the greenhouse gas O in the air floatation 3 The discharge of the water heater can be achieved at one time.
3. The addition amount of ozone in the wastewater is 3-5mg/L, and the addition amount of the ozone in the wastewater is 8-10mg/L. The method comprises the steps of injecting excessive ozone into sludge, concentrating by ozone gas floatation, wrapping scum with ozone, carrying out thermal hydrolysis, releasing organic matters by thermal hydrolysis, and stabilizing the soil for use by one-step thermal hydrolysis, wherein the germination rate of seeds can reach 100%, and the oxygen consumption rate can be reduced by 30%. The invention fully plays the role of catalytic oxidation of ozone, and in the air floatation and thermal hydrolysis device, ozone is wrapped with sludge to play a role of catalytic oxidation, thereby assisting in breaking the wall of the sludge; in the waste gas treatment, the excessive ozone generated by the air floatation can fully eliminate the odor generated by the thermal hydrolysis, and the ozone means is fully utilized.
4. According to the invention, only 4-5 permillage of PAM is added in the medicine, and no additional flocculant such as PAC is needed. The invention has no requirement for reducing the water content of the ozone air floatation scum, and the air floatation device mainly plays a role in rapidly concentrating the ozone and fully playing the role of ozone catalysis. Therefore, the invention is essentially different from the traditional air floatation, and the PAM aqueous solution is dissolved under the catalysis of high-temperature ozone, so that the investment and pollution of the iron-aluminum salt medicament are reduced in the whole technical route.
Drawings
Fig. 1 is a schematic diagram of an ozonization conditioning coupled hydrothermal rapid stabilization treatment process for organic sludge.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples.
An ozonization conditioning coupling hydrothermal rapid stabilization treatment process of organic sludge is mainly suitable for municipal sewage treatment plant sludge (such as a Yangtze river economic zone of China) with high sand content of less than 45%, and fig. 1 is a schematic diagram of the ozonization conditioning coupling hydrothermal rapid stabilization treatment process of the organic sludge, and mainly comprises an ozone dissolved air floatation device 1 and a thermal hydrolysis reaction kettle 2 which are both closed micro negative pressure devices, wherein the ozone dissolved air floatation device 1 and the thermal hydrolysis reaction kettle 2 are connected through a pipeline provided with a booster pump 7, an arch-shaped joint pipeline 3 is connected above the ozone dissolved air floatation device 1, the ozone dissolved air floatation device 1 is connected with an ozone dissolved air tank 6, an exhaust pipeline is connected above the thermal hydrolysis reaction kettle 2 and is used for extracting mixed waste gas containing high-concentration ozone, the air floatation device structure adopts an upper arch-shaped joint pipeline 3 to uniformly extract, vapor condensation is promoted by adopting an arch-shaped circular pipe, a scraping plate directly scrapes high water content into a collecting tank, and the collecting tank enters the thermal hydrolysis reaction kettle according to set logic; the arch-shaped row pipeline and the gas pipeline are connected with the ozone digestion chamber 4, the ozone digestion chamber 4 is connected with the ozone advanced treatment chamber 5, and the ozone advanced treatment chamber 5 is an acid liquid pool with the pH value of=5.
The specific treatment comprises the following steps: stirring and homogenizing sludge (without adding medicines), wherein the concentration range of SS of the sludge is 8000-12000 mg/L. The mud-water mixture is sucked into a pressurized ozone dissolved air floatation device, the traditional iron-aluminum salt coagulant is abandoned, ozone with proper dosage is introduced, and only cation PAM is added, so that the ozone dissolved air release and slag scraping operation are rapidly completed. Ozone-containing micro-bubble scum (the water content is about 92%) enters a thermal hydrolysis reaction kettle through a pipeline booster pump, and the sludge stabilization standard can be achieved after thermal hydrolysis sludge wall breaking and concentration. The high-concentration ozone mixed waste gas generated by the air floatation device fully reacts with the odor generated by thermal hydrolysis and then reaches the standard to be discharged.
According to the invention, the thermal hydrolysis is transferred from the traditional front-end pretreatment process to the core treatment unit for realizing sludge stabilization, and the process realizes that the non-condensable gas generated by the thermal hydrolysis is directly deodorized, so that the problem that the non-condensable odor of the traditional thermal hydrolysis reaction gas is difficult to treat is solved. By combining the physicochemical properties of the sludge and efficiently coupling the sludge treatment process, the ozone catalytic oxidation efficiency is fully exerted, and the aims of sludge treatment reduction, harmlessness and recycling are truly realized in a low-carbon and low-cost environment.
The following is a specific application example:
an ozonization conditioning coupling hydrothermal rapid stabilization treatment process of organic sludge comprises the following steps: stirring and homogenizing sludge (without adding medicines) of urban sewage treatment plants, wherein the concentration range of SS is 12000mg/L, sucking a sludge water mixture into a pressurized ozone dissolved air floatation device, injecting the sludge water mixture into a single facility at the effective water depth of 1.8m at the temperature of 100 ℃, adding the ozone with the addition amount of 10mg/L, simultaneously adding 5 permillage cationic PAM medicament, rapidly completing ozone dissolved air release and slag scraping operation, ensuring the hydraulic retention time of a contact chamber to be 1.5min, ensuring the hydraulic retention time of a separation chamber to be 8min, ensuring the batch completion time to be 9.5min, ensuring the working pressure of an ozone dissolved air tank to be 0.6Mpa, and ensuring the dissolved air water to be the effluent of the urban sewage treatment plants. Ozone-containing microbubble scum (the water content is more than 95%) enters a thermal hydrolysis reaction kettle through a pipeline booster pump, the wall breaking of sludge is completed through the thermal hydrolysis reaction kettle at 200 ℃, and the sludge stabilization standard is achieved after solid-liquid separation. Wherein, the air floating device and the thermal hydrolysis reaction kettle are both sealed with micro negative pressure, the upper arch-shaped joint exhaust pipeline uniformly extracts mixed waste gas containing high-concentration ozone, the ozone content is 27mg/L, the mixed waste gas is mixed with odor generated by thermal hydrolysis in an ozone digestion chamber, and the mixed waste gas is treated by an ozone advanced treatment chamber and then discharged after reaching standards.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.

Claims (7)

1. An ozonization conditioning coupling hydrothermal rapid stabilization treatment process for organic sludge is characterized in that the sludge is stirred and homogenized, ozone is injected into a pressurized ozone dissolved air floatation device at the temperature of 100 ℃, the ozone addition amount is 8-10mg/L, a sludge water mixture is sucked into the pressurized ozone dissolved air floatation device, a cationic PAM medicament is added, the ozone dissolved air release and slag scraping operation is completed, ozone-containing micro-bubble scum enters a thermal hydrolysis reaction kettle, the sludge is broken by thermal hydrolysis, and then the sludge stabilization standard is achieved after solid-liquid separation;
the sludge is sludge of a town sewage treatment plant with high sand content and organic matters lower than 45%, the concentration range of solid suspended matters is 8000-12000 mg/L, and the cationic PAM configuration mass ratio is 4-5 per mill.
2. The ozonization conditioning coupling hydrothermal rapid stabilization treatment process of organic sludge according to claim 1, wherein the ozone dissolved gas release and slag scraping operation is finished in batches, and the batch finishing time is less than or equal to 10min.
3. The ozonization-conditioning-coupling hydrothermal rapid stabilization treatment process of organic sludge according to claim 1, wherein ozone-containing microbubble scum enters a thermal hydrolysis reaction kettle through a pipeline booster pump.
4. The ozonization and conditioning coupling hydrothermal rapid stabilization treatment process of organic sludge according to claim 1, wherein the ozone dissolved air floatation device and the thermal hydrolysis reaction kettle are both closed micro negative pressure devices,
the upper part of the ozone dissolved air floatation device is connected with an arch-shaped row pipeline, and the upper part of the thermal hydrolysis reaction kettle is connected with an exhaust pipeline, which are all used for extracting mixed waste gas containing high-concentration ozone;
the arch-shaped row pipeline and the exhaust pipeline are connected with an ozone digestion chamber, the rear of the ozone digestion chamber is connected with an ozone advanced treatment chamber, and the ozone advanced treatment chamber is an acid liquid pool with pH=5.
5. The ozonization conditioning coupling hydrothermal rapid stabilization treatment process of organic sludge according to claim 1, wherein the effective water depth in the ozone dissolved air floatation device is 1.8-2 m, the hydraulic retention time of a contact chamber is 1.2-1.5 min, and the hydraulic retention time of a separation chamber is 1.2-1.5 minThe time is not more than 8min, and the surface load of the separation chamber is 6-8 m 3 /(m 2 And/h), the working pressure of the ozone dissolved air tank is 0.6Mpa, and the dissolved air water is tap water or effluent of urban sewage treatment plants.
6. The ozonization conditioning coupling hydrothermal rapid stabilization treatment process of organic sludge according to claim 1, wherein the ozone content of the mixed waste gas of high-concentration ozone generated by the pressurized ozone dissolved air floatation device is 15-27mg/L.
7. The ozonization-conditioning-coupled hydrothermal rapid stabilization treatment process of organic sludge according to claim 1, wherein the thermal hydrolysis reaction temperature in the thermal hydrolysis reaction kettle is 180-200 ℃.
CN202210472094.7A 2022-04-29 2022-04-29 Ozonization conditioning coupling hydrothermal rapid stabilization treatment process for organic sludge Active CN114956499B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2843106B1 (en) * 2002-08-05 2004-10-08 Omnium Traitement Valorisa PROCESS AND PLANT FOR TREATING SLUDGE FROM BIOLOGICAL WATER PURIFICATION PLANTS
CN104628233A (en) * 2014-12-30 2015-05-20 浙江海亮固废处理科技有限公司 Deep dehydration device and deep dehydration method for organic materials
CN107892457B (en) * 2017-12-19 2023-06-09 上海城市水资源开发利用国家工程中心有限公司 Sludge microbubble ozone stabilization device and method
CN109970303A (en) * 2019-03-15 2019-07-05 深圳市兴能保环境科技有限公司 A kind of modular sludge hot hydrolysis process for treating and device
CN111018289A (en) * 2019-12-19 2020-04-17 南京銮鑫环境科技有限公司 Sludge reduction treatment system and method based on ozone micro-nano bubbles
CN113277697A (en) * 2021-06-25 2021-08-20 上海城市水资源开发利用国家工程中心有限公司 Device and method for drying sludge by combining microbubble ozonation with low temperature
CN113292215A (en) * 2021-06-25 2021-08-24 上海城市水资源开发利用国家工程中心有限公司 Residual sludge treatment device and method combining microbubble ozonation and thin-layer drying
CN114292005A (en) * 2021-12-31 2022-04-08 同济大学 Method and system for strengthening air flotation concentration reduction and harmlessness of sludge by using ozone

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