CN105948436A - System and method for stabilizing and recycling excess sludge of sewage treatment plant - Google Patents
System and method for stabilizing and recycling excess sludge of sewage treatment plant Download PDFInfo
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- CN105948436A CN105948436A CN201610504095.XA CN201610504095A CN105948436A CN 105948436 A CN105948436 A CN 105948436A CN 201610504095 A CN201610504095 A CN 201610504095A CN 105948436 A CN105948436 A CN 105948436A
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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
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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
- C02F11/02—Biological treatment
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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
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- Treatment Of Sludge (AREA)
Abstract
The invention belongs to the field of treatment of pollutants, and particularly relates to a treatment system and method for excess sludge of a sewage treatment plant. The treatment system comprises an adjusting tank, a reaction kettle and a clarifying tank which are sequentially intercommunicated, wherein the reaction kettle is communicated with an ozone storing tank, an ozone generator and an oxygen generation station; the clarifying tank is correspondingly communicated with a phosphate removing system and an excess sludge conditioning tank; a micro-bubble generator is mounted in the reaction kettle, and an air inlet of the micro-bubble generator is connected with the ozone storing tank. The system can be directly connected with a biochemical system of the sewage treatment plant, so as to achieve resource cycling utilization. According to the treatment system and method, the unique physicochemical property of micro bubble is utilized to solve the problems of high losing rate, high dosage, high treatment cost and failed application in actual engineering of an ozone oxidizing method for stabilizing treatment of the excess sludge, and the bottleneck of engineering application of the ozone can be broken. With the adoption of the system and the method, the excess sludge can be stabilized, and the excess sludge can also be recycled in the plant.
Description
Technical field
The invention belongs to Pollutant Treatment field, be specifically related to processing system and the method for a kind of sewage plant excess sludge, treated
Mud can to reach excess sludge of regulation in " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) stable
Change requirement, realize excess sludge resource recycling in sewage treatment plant simultaneously and utilize.
Background technology
Along with day by day improving and the reinforcement of environmental protection dynamics of environmental regulation, China's year wastewater treatment capacity improves rapidly.By 2011
Year JIUYUE, the built urban wastewater treatment firm 3078 that puts into operation of China, disposal ability reaches 1.36 hundred million m3/ d, National urban is dirty
Water handling rate reaches about 80%.And in municipal sewage plant of China, activated sludge process is the sewage disposal being most widely used
Technology.The method is since 20 beginnings of the century were applied to sewage disposal, because of advantages such as its treatment effeciency height, stable and reliable operations,
Gaining great popularity all over the world, oneself becomes the most widely used a kind of sewage treatment process in the whole world at present, also has 80% in world wide
Above sewage disposal station-service is activated sludge process.
Activated sludge process excess sludge generation amount is usually 0.3%～0.5% (in terms of moisture content 97%) of sewage load, it is estimated me
The dry weight of state's Sewage Plant generation excess sludge in 2010 has surpassed 20,000,000 tons of (sludge yields 2.7 tons with every ten thousand tons of sewage
Meter), the process handling problems of excess sludge is increasingly serious.Due to many reasons such as fund, technology and awareness traditionally,
Often there are the mistaken ideas of " heavily sewage disposal, light Treatment of Sludge " when sewage disposal, cause sewage at municipal sewage plant's warp
Qualified discharge after process, and after entering environment without the appropriate mud processing disposal in a large number, bring secondary pollution directly to environment,
Not only reduce the effective processing capacity of sewage disposal system, and ecological environment and mankind's activity are constituted serious threat." city
Town Wastewater Treatment discharge standard " (GB18918-2002) clear stipulaties, the mud of urban wastewater treatment firm should be carried out surely
Determining processes, and the index that stabilizing treatment should reach is as shown in table 1.
Table 1 sludge stabilizing Con trolling index
According to China's network of rivers prediction, to 2015 end of the years, China's dewatered sludge annual production will be more than 26,000,000 t, it has also become the whole nation
Even in world wide, the faced Tough questions in municipal sewage plant and heavy burden.
Treatment of Sludge seeks on the premise of ensureing sludge stabilization safety with the purpose of disposal, it is achieved decrement and resource.Mesh
Before.The process of mud, method of disposal are broadly divided into: stabilisation, innoxious, minimizing and resource.
(1) stabilisation: generally by middle temperature or thermophilic digestion or middle temperature aerobic sigestion, make process sludge stabilizing, finally locate
Postpone the further degraded no longer producing mud, thus avoid producing secondary pollution；
(2) innoxious: to reach the innoxious of mud and hygienization, as killed antibacterial and parasitic ovum, and remove or fixing heavy metal
Deng；
(3) minimizing: reduce the volume before sludge ultimate disposal and quality, to reduce the expense of Treatment of Sludge and final disposal；
(4) resource: processing the purpose of the environment that reaches while mud to turn bane into boon, comprehensively utilize, protect, as produced biogas
(biogas), as farmland organic fertilizer, soil conditioner etc..
Wherein, it is achieved the method for sludge stabilizing mainly has: anaerobic digestion, aerobic sigestion and aerobic compost etc..These methods are all
The source Repiration being dependent on heat energy and microorganism realizes the decrement of biosolids in mud.
Currently for most of middle-size and small-size Sewage Plant due to fund and the restriction of technical force, mud is simply used thickening
After carry out the processing mode that fills, digestion is stable and drying and other treatment little, really carries out innoxious, recycling treatment the most less.
Thickening processing mode is only reduction of the moisture content of mud, reduces the volume of mud, and solid organic matters total in mud
Amount does not become.
Use ozone that sewage treatment plant residual mud is carried out research that stabilisation and minimizing process at home and abroad have research and
Report, is the processing mode of the efficient stable generally acknowledged the most in the industry, but owing to ozone preparation cost is high, the problem one that the rate that escapes is high
Directly cannot effectively solve, cause the construction cost of ozone process technique and processing cost the most high, constrain at Practical Project
In application.
Summary of the invention
Escaping problem to solve ozone present in prior art, the present invention utilizes micron and the high surface energy of nano bubble, height
Diffusibility, bigger serface solve ozone well and escape problem, and ozone dosage is reduced to 0.01kg/kg and cuts down Organic substance,
Processing cost is reduced to the level of anaerobic digestion process, breaches the bottleneck of practical engineering application.
The invention belongs to the breaking cellular wall lysis law technology classification increased based on recessiveness, use micron and nano level micro-bubble as smelly
The carrier of oxygen, utilizes the strong oxidizing property of ozone to kill the microorganism in excess sludge, broken and breaking cellular wall lysis is killed simultaneously
Various pathogen.After ozone microbubble reaction treatment 4 hours, the organic matter degradation amount in excess sludge reaches 50%, is higher than
The stabilisation requirement of organic matter degradation 40% in GB18918-2002 standard, the supernatant carbon-nitrogen ratio after breaking cellular wall lysis stably reaches 15:
1, B/C reaches 0.4～0.5, has abundant carbon source and good biodegradability, can be back to use as carbon source fill-ins such as methanol
The biochemical system of Sewage Plant, improves total nitrogen removal ability more than 10%.
The processing cost of the present invention converts sewage disposal expense about 0.05 yuan/ton, close with the processing cost of anaerobic digestion process,
But the process time is only the 1/10 of anaerobic digestion process, floor space is approximately the 1/20 of anaerobic digestion process.
A kind of sewage treatment plant residual sludge stabilization and the processing system of recycling, including the regulation tank (pond) being sequentially communicated,
Reactor, settling tank (pond), reactor is connected with ozone air accumulator, ozonator, oxygen generating station, settling tank (pond) point
Not nursing one's health tank (pond) with dephosphorization system and residual mud to be connected, be provided with microbubble generator in described reactor, microbubble occurs
The air inlet of device is connected with ozone air accumulator.The system of the present invention processes liking the moisture content 99.5% that Sewage Plant biochemical system is discharged
Or above excess sludge；Native system can directly be connected with the biochemical system of sewage treatment plant, it is achieved resource recycling utilizes, example
As, the sewage after existing biochemical treatment system processes is adjusted tank (pond) entrance native system, after processing in native system, solid-liquid
Portion returns Sewage Plant via residual mud conditioning tank (pond) and dephosphorization system respectively.
Wherein, the quantity of microbubble generator can be according to ozone dosage, the ozone concentration of ozonator and microbubble generator
Charge flow rate calculate；When use multiple microbubble generator time, can on the vertical line of retort layout straggly, pass through
The bubble exit of differing heights makes ozone microbubble be fully contacted reaction at every aspect and mud.
Described ozone air accumulator is connected with the gas outlet of ozonator, and ozonator air inlet is connected with oxygen generating station.
Described dephosphorization system is made up of medicine machine, pipe-line mixer, settling tank (pond).
The invention also discloses a kind of sewage treatment plant residual sludge stabilization and the processing method of recycling, including: mud from
Biochemical system enters reactor after discharging, and carries out the step of ozone process, and be provided with microbubble in reactor in reactor
Generator, uses micron and nano level micro-bubble as the carrier of ozone, processes mud.
Specifically, said method comprises the following steps:
(1) mud warp after biochemical system is discharged is transported to reactor by regulation tank,
(2) in reactor, microbubble generator can prepare the micro-of particle diameter nano bubble below 200 nanometers and less than 5 microns
Meter level bubble, uses ozone to produce ozone microbubble in reactor as source of the gas, and mud breaks through ozone microbubble in reactor
Wall pretreatment；
(3) entering settling tank at reactant liquor after breaking cellular wall lysis in reactor and carry out solid-liquid separation, the top of settling tank is clear
Clear district, supernatant enters dephosphorization system, Shi Canni settling zone, bottom, and residual mud enters residual mud conditioning tank；
(4) supernatant after dephosphorization processes is back to use Sewage Plant Biochemistry Reaction System as carbon source fill-in；Residual in settling tank
Slag is sent to Sewage Plant evaporation plant and is dehydrated.
Wherein, step (3) is specifically: the sludge liquid after reaction treatment is transported to settling tank and carries out solid-liquid separation, upper after separation
Clear liquid is transported to settling tank through pipe-line mixer, and supernatant mixes with the Dephosphorization reagent from chemicals feeder in pipe-line mixer
Close, complete to precipitate dephosphorization in settling tank.
The effect of regulation tank (pond) is to store the excess sludge that biochemical system is discharged when reactor runs temporarily, stablizes reactor
Enter mud amount.
Reactor is that ozone carries out the reaction compartment of breaking cellular wall lysis to excess sludge, the excess sludge time of staying in reactor about 4
Hour.Reactor uses stainless steel material to make, and inwall carries out anti-ozone Oxidation Treatment
Ozonator is the machine preparing the required ozone of reaction, uses pure oxygen as oxygen source.
Air accumulator stores the ozone that ozonator prepares temporarily, and air accumulator realizes the regulation of the homogenizing to ozone concentration simultaneously.
Microbubble generator can prepare particle diameter nano bubble (such as Fig. 2) below 200 nanometers and the micron order of less than 5 microns
Bubble (such as Fig. 3), uses ozone can produce ozone microbubble in reactor as after source of the gas, utilizes microbubble high surface energy
With the utilization rate that bigger serface improves ozone.The flow of microbubble generator is 40L/min.Ozone dosage is preferred
0.01kg/kg cuts down Organic substance.
Settling tank (pond) is for carrying out solid-liquid separation to the reactant liquor after breaking cellular wall lysis, and settling tank is conicity, and top is clarification
District, supernatant (reuse liquid) enters dephosphorization system, Shi Canni settling zone, bottom, and residual mud enters residual mud conditioning tank.
Dephosphorization system is made up of medicine machine, pipe-line mixer, settling tank (pond), for reuse liquid is carried out dephosphorization process.
Residual mud conditioning tank (pond) is for nursing one's health residual mud, and the residual mud dehydration property after conditioning improves 30%, is sent to Sewage Plant existing
Evaporation plant be dehydrated.
Oxygen generating station includes oxygen generation system and fire-fighting system, for preparing the pure oxygen required for ozonator.
In the methods of the invention, in order to implement recycling, by the laying mode of microbubble generator, ozone addition and
It is good that the control in response time reaches biodegradability, the reuse requirement that carbon source is abundant；Increase single dephosphorization system to remove reuse
Phosphorus in liquid；Adding residual mud conditioning step, the dewatering of the residual mud after making ozone process improves 30%.
The present invention utilizes the physicochemical property of microbubble uniqueness to solve Ozone oxidation method and escapes when for excess sludge stabilizing treatment
The problem that mistake rate is high, dosage is big, processing cost is high, cannot apply in Practical Project, breaches ozone on engineer applied
Bottleneck.The present invention, had both completed the stabilizing treatment to excess sludge, achieves again the in-plant resource of excess sludge and returns
With, reduce the operating cost of Sewage Plant and improve the biochemical system clearance to total nitrogen.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention.Wherein: 1-regulation tank (pond), 2-ozone reaction still, 3-microbubble generator, 4-oxygen
Stand, 5-ozonator, 6-air accumulator, 7-settling tank (pond), 8-settling tank (pond), 9-medicine machine, 10-line-blending
Device, 11-residual mud conditioning tank (pond).
Fig. 2 is the grain size distribution of the nano grade air bubbles that the microbubble generator used by the present invention produces.(detection unit: East China teacher
Model university water environment and interface science research center detection time: in January, 2015)
Fig. 3 is the grain size distribution of the micron order level bubble that the microbubble generator that the present invention uses produces.(detection unit: China
East normal university water environment and interface science research center detection time: in January, 2015)
VSS in the mud that Fig. 4 is the present invention obtained by the sewage disposal system of 100t/d carries out pilot scale
(MLVSS) reduction and clearance.
The reduction of the sludge concentration (MLVSS) that Fig. 5 is the present invention obtained by the sewage disposal system of 100t/d carries out pilot scale
And clearance
The carbon-nitrogen ratio of supernatant after the breaking cellular wall lysis that Fig. 6 is the present invention obtained by the sewage disposal system of 100t/d carries out pilot scale.
Fig. 7 is that present invention supernatant when the sewage disposal system of 100t/d carries out pilot scale is back to use biochemical treatment system as carbon source
Water outlet COD affected data.
Fig. 8 is that present invention supernatant when the sewage disposal system of 100t/d carries out pilot scale is back to use biochemical treatment system as carbon source
Water outlet total nitrogen affected data.
Fig. 9 detection data of residual mud sanitary index that are the present invention when the sewage disposal system of 100t/d carries out pilot scale.
Figure 10 is that the present invention residual mud stabilisation when the sewage disposal system of 100t/d carries out pilot scale observes photo.A is untreated
Sample, smelly blackout；B is reaction 3 little up-to-date styles, unchanged；C is reaction 3 little up-to-date styles, unchanged.
Detailed description of the invention
Embodiment 1
Present system is constituted as it is shown in figure 1, sent out by regulation tank (pond), reactor, ozonator, air accumulator, microbubble
The part compositions such as life device, settling tank (pond), dephosphorization system, residual mud conditioning tank (pond), oxygen generating station, process liking Sewage Plant
The moisture content 99.5% of biochemical system discharge or above excess sludge.
Mud enters regulation tank (pond) 1 after biochemical system is discharged, then is transported to ozone reaction still 2 by sludge pump.In reactor
Microbubble generator 3 is installed.
The air inlet of microbubble generator is connected with ozone air accumulator 6, and ozone air accumulator is connected with ozonator 5, and ozone is sent out
The oxygen source of raw device uses the pure oxygen of oxygen generating station 4 output.Ozone air accumulator and ozonator are arranged on by reactor.Ozone occurs
The ozone that device produces enters microbubble generator with uniform concentration after air accumulator stored adjustment, and microbubble generator is made with ozone
For source of the gas, produce ozone microbubble.
Sludge liquid after reaction treatment is transported to settling tank (pond) 7 and carries out solid-liquid separation.Supernatant after separation is through line-blending
Device 10 is transported to settling tank (pond) 8.Supernatant mixes with the Dephosphorization reagent from chemicals feeder 9 in pipe-line mixer,
Settling tank (pond) completes precipitate dephosphorization.It is biochemical that supernatant after dephosphorization processes is back to use Sewage Plant as carbon source fill-in
Response system.Residue in settling tank is sent to Sewage Plant evaporation plant and is dehydrated.
In settling tank (pond) 7, the residual mud of precipitate and separate is transported to residual mud conditioning tank (pond) 11 through sludge pump, adds conditioner and completes
It is sent to Sewage Plant evaporation plant after conditioning be dehydrated.
Microbubble generator charge flow rate 40L/min, ozone concentration 110mg/L, mud is in the time of staying about 4 of ozone reaction still
Hour, ozone dosage 0.01kg/kg cuts down Organic substance.
Embodiment 2
The present invention carries out pilot scale in the sewage disposal system of 100t/d, and result is as follows:
(1) in excess sludge, VSS (MLVSS) cuts down 50% (Fig. 4), and sludge concentration (MLSS) cuts down 45% (figure
5) requirement to sewage plant sludge stabilisation in " urban wastewater treatment firm pollutant emission standard " (GB18918-2002), it is higher than
Regulation；
(2), after reacting 3 hours, the supernatant liquid carbon-nitrogen ratio after process stably reaches 15:1 (Fig. 6), B/C about 0.4～0.5, carbon
Source is sufficient, and biodegradability is good, can be back to use Sewage Plant biochemical system as carbon source fill-in；
(3) such as Fig. 7, within first 36 days, it is the non-reuse of supernatant, water outlet average COD 28.3mg/L；36th day starts, supernatant conduct
Carbon source is back to use biochemical system, water outlet average COD 29.2mg/L, substantially without impact.Such as Fig. 8, within first 36 days, do not return for supernatant
With, water outlet average total nitrogen 17.2mg/L, average removal rate 51.4%；36th day starts, and supernatant is back to use life as carbon source
Change system, water outlet average ammonia nitrogen 13.2mg/L, average removal rate 62.6%.After supernatant fluid reuse, total nitrogen average removal rate improves
More than 10%.Show that the COD in sewage effluents, ammonia nitrogen, total phosphorus, to after biochemical system, are not affected by supernatant fluid reuse,
Nitrogen removal rate improves more than 10%；
(4) converting according to carbon equivalent and consider nitrogen contained in supernatant, the mud of moisture content 80% per ton can be equivalent to 30 with output
The supernatant of kilogram methanol denitrification effect, not only realizes the in-plant recycling of excess sludge, also reduces Sewage Plant
Operating cost；
(5) supernatant dephosphorization slag mud quantity is few and based on inorganic matter, sells as outside greening nutritive soil after can being dehydrated；
(6) the complete decoloration and deodorization of residual mud after processing, after after process, mud stands one month, mud sample unchanged (Figure 10)
(7) after the present invention processes, residual mud reaches " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) standard and U.S.
State A level mud standard.Residual mud realizes innoxious, and colibacillus of excrement, Salmonella, roundworm egg all reach not detect level, super
Cross U.S. A level mud standard (Fig. 9)；
(8), after residual mud is conditioned, dewatering (CST) improves 30%, follow-up processed；
(9) the existing utility equipment such as the existing concentration basin of Sewage Plant, homogenizing pond, dehydration equipment can be made full use of, without corrupt, different after dehydration
The problem such as taste, health, can sell as greening soil is outer.
(10) ozone dosage only 0.01kg/kg cuts down Organic substance, reaches the international leading level；
(11) construction investment and processing cost reach the level close with anaerobic digestion process, less than aerobic fermentation compost, burning and drying
Technique is processed Deng other；
(12) response time is the 1/10 of anaerobic digestion process, and floor space is only the 1/20 of anaerobic digestion process, economizes the land resource；
(13) stable, not by the environmental influence such as temperature, humidity.
Claims (7)
1. a sewage treatment plant residual sludge stabilization and the processing system of recycling, it is characterised in that: include being sequentially communicated
Regulation tank, reactor, settling tank, described reactor is connected with ozone air accumulator, ozonator, oxygen generating station, clarification
Tank is nursed one's health tank with dephosphorization system and residual mud respectively and is connected, and is provided with microbubble generator, entering of microbubble generator in reactor
QI KOU is connected with ozone air accumulator.
System the most according to claim 1, it is characterised in that ozone air accumulator is connected with the gas outlet of ozonator,
Ozonator air inlet is connected with oxygen generating station.
System the most according to claim 1, it is characterised in that dephosphorization system is by medicine machine, pipe-line mixer, precipitation
Tank forms.
System the most according to claim 1, it is characterised in that microbubble generator is multiple, at the vertical line of retort
Upper layout straggly.
5. sewage treatment plant residual sludge stabilization and a processing method for recycling, including: mud is discharged from biochemical system
Rear entrance reactor, carries out the step of ozone process in reactor, it is characterised in that: in reactor, it is provided with microbubble occurs
Device, uses micron and nano level micro-bubble as the carrier of ozone, processes mud.
Method the most according to claim 5, it is characterised in that comprise the following steps:
(1) mud warp after biochemical system is discharged is transported to reactor by regulation tank,
(2) in reactor, microbubble generator prepares particle diameter nano bubble below 200 nanometers or the micron order of less than 5 microns
Bubble, uses ozone to produce ozone microbubble in reactor as source of the gas, and mud is molten through ozone microbubble breaking cellular wall in reactor
Born of the same parents process；
(3) entering settling tank at reactant liquor after breaking cellular wall lysis in reactor and carry out solid-liquid separation, the top of settling tank is clear
Clear district, supernatant enters dephosphorization system, Shi Canni settling zone, bottom, and residual mud enters residual mud conditioning tank；
(4) supernatant after dephosphorization processes is back to use Sewage Plant Biochemistry Reaction System as carbon source fill-in；Residual in settling tank
Slag is sent to Sewage Plant evaporation plant and is dehydrated.
Method the most according to claim 6, it is characterised in that: step (3) specifically: the sludge liquid after reaction treatment
Being transported to settling tank and carry out solid-liquid separation, the supernatant after separation is transported to settling tank through pipe-line mixer, and supernatant is at pipeline
Blender mixes with the Dephosphorization reagent from chemicals feeder, completes to precipitate dephosphorization in settling tank.
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| CN108455812A (en) * | 2018-03-28 | 2018-08-28 | 北京昊业怡生科技有限公司 | The processing method of organic matter in excess sludge |
| CN108455812B (en) * | 2018-03-28 | 2020-06-16 | 北京昊业怡生科技有限公司 | Method for treating organic matters in excess sludge |
| CN108383349A (en) * | 2018-05-14 | 2018-08-10 | 上海城市水资源开发利用国家工程中心有限公司 | A kind of novel residual active sludge carbon source retracting device and method |
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| CN111170607A (en) * | 2020-03-09 | 2020-05-19 | 深圳市中涛环保工程技术有限公司 | Device and method for recycling excess sludge |
| 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 |
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| CN114477672A (en) * | 2022-01-10 | 2022-05-13 | 长春工程学院 | Treatment system and treatment method for recycling excess sludge of urban sewage plant |
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