CN104710004B - Sewage disposal system second pond Mud up-floating early warning and control method - Google Patents
Sewage disposal system second pond Mud up-floating early warning and control method Download PDFInfo
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
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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
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a kind of sewage disposal system second pond Mud up-floating early warning and control method, belong to environmental wastewater Treatment process field.The early warning classification of second pond Mud up-floating is there is in sewage disposal system in the present invention by setting up；Account for black quantity and the accounting of dark brown quantity in the ratio i.e. coverage of cell body surface area, activated sludge color according to second pond floating sludge area coverage, filamentous microorganism quantity is partitioning standards, is divided into three grades；And according to early warning classification, use following methods to be controlled.The present invention carries out early warning at the initial stage that Mud up-floating occurs, and takes different countermeasures respectively, is eliminated in original state, probability that Mud up-floating occur can be greatly decreased, be practicable cost-effective method.By three grades of early warning systems, Mud up-floating being taked different control measure, sewage treatment plant operating cost can be greatly reduced and expense puts into, treatment effect is preferable.
Description
Technical field
The invention belongs to environmental wastewater Treatment process field, be specifically related to sewage disposal system second pond Mud up-floating early warning and control method.
Background technology
Activated sludge process is that sewage treatment plant is most widely used general and have the dirty water living creature processing technique of development potentiality.Activated sludge, due to self reason or outside cause, causes relative density to be less than 1, floats up to second pond surface, causes Mud up-floating phenomenon.On the one hand making mud-water separation effect be deteriorated, outlet water organic substance concentration and suspended sediment concentration raise, and on the other hand affect normal sludge quantity required in Aeration tank, and operation and control to sewage treatment plant bring bigger difficulty.
The reason causing Mud up-floating is varied, and analyzing its reason occurred needs the longer time, brings inconvenience to operation control.Activated sludge floating control method is taked after activated sludge floats generation in a large number at present, has obvious hysteresis effect, not only puts into costly, and effect is not ideal.
Summary of the invention
The technical problem to be solved is for the deficiencies in the prior art, propose a kind of sewage disposal system second pond Mud up-floating phenomenon to carry out early warning the sewage disposal system second pond Mud up-floating early warning being controlled in time and control method, the method can reduce operating cost, improves treatment effect.
The technical problem to be solved is to be realized by following technical scheme.The present invention is a kind of sewage disposal system second pond Mud up-floating early warning and control method, is characterized in, its step is as follows:
(1) the early warning classification that second pond Mud up-floating occurs in sewage disposal system is set up；Account for black quantity and the accounting of dark brown quantity in the ratio i.e. coverage of cell body surface area, activated sludge color according to second pond floating sludge area coverage, filamentous microorganism quantity is partitioning standards, is divided into three grades；Wherein:
When in second pond floating sludge coverage less than 30%, activated sludge color, black quantity accounts for more than 70%, filamentous microorganism negligible amounts is first-degree alert, and this rank is Mud up-floating early period of origination；
When in second pond floating sludge coverage 30% ~ 50%, activated sludge color, dark brown quantity accounts for 70% less than 90%, filamentous microorganism quantity mostly relatively is two grades of warnings, and this rank is Mud up-floating period of expansion, and needing takes appropriate measures is controlled；
When in second pond floating sludge coverage more than 50%, activated sludge color, dark brown quantity accounts for more than 90%, filamentous microorganism quantity is much three grades of warnings, and this rank is the serious phase of Mud up-floating, need to take appropriate measures and be controlled；
Described filamentous microorganism negligible amounts refers to thread mycelia, is incidentally present of in some flco；Quantity is more to be referred in all flcos with the presence of thread mycelia, 5 ~ 20 mycelia/flcos；Quantity much refer to thread mycelia far more than flco, 20 ~ 100 mycelia/flcos；
(2) according to early warning classification, following methods is used to be controlled:
When first-degree alert, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 1 ~ 3:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 0.5 ~ 1:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 2 ~ 4mg/L；
When guarding against for two grades, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 3 ~ 5:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 1 ~ 2:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 2 ~ 4mg/L；
4. 5 ~ 10mg/L antibacterial is added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age；
When guarding against for three grades, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 5 ~ 7:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 2 ~ 3:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 2 ~ 4mg/L；
4. the antibacterial of 10 ~ 15mg/L is added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age.
Sewage disposal system second pond Mud up-floating early warning of the present invention and control method, described antibacterial can select in prior art one or more in any antibacterial going for the present invention, preferably sodium hypochlorite, hydrogen peroxide, copper sulfate, liquid chlorine, chlorine dioxide, bleaching powder.When using the antibacterial of mixing, its consumption can be prepared on demand.
Sewage disposal system second pond Mud up-floating early warning of the present invention and control method, in step (2), when first-degree alert, it is preferred to use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 1.5 ~ 2.5:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 0.6 ~ 0.8:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 2.5 ~ 3.5mg/L；
Further preferred control method is:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 2:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 0.7:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 3mg/L.
Sewage disposal system second pond Mud up-floating early warning of the present invention and control method, in step (2), when guarding against for two grades, it is preferred to use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 3.5 ~ 4.5:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 1.3 ~ 1.7:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 2.5 ~ 3.5mg/L；
4. 6 ~ 8mg/L antibacterial is added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age；
The further preferably following control method of employing:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 4:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 1.5:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 3mg/L；
4. 7mg/L antibacterial is added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age.
Sewage disposal system second pond Mud up-floating early warning of the present invention and control method, in step (2), when guarding against for three grades, it is preferred to use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 5.5 ~ 6.5:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 2.3 ~ 2.7:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 2.5 ~ 3.5mg/L；
4. the antibacterial of 12 ~ 14mg/L is added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age；
The following control method of employing further:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 6:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 2.5:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 3mg/L；
4. the antibacterial of 13mg/L is added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age.
During sewage disposal, owing to the generation of Mud up-floating is a process, when it is observed that during significantly Mud up-floating, activated Sludge System has occurred and that qualitative change in fact, for causing the control of the quantitative change process of qualitative change, the trend that can be floated in a large number by mud is eliminated in bud, is the major technique thinking of the present invention.
Inventor, according to long-term on-the-spot experimental observation, have selected and affects 3 major parameters that Mud up-floating phenomenon occurs in activated Sludge System, test and assess, determine its occurrence degree, it is determined that its corresponding rank, carry out early warning and control simultaneously.
Activated sludge color in the present invention, black refers to second pond activated sludge deposition, under anaerobic decomposes and produce carbon dioxide and methane, cause the mud containing above-mentioned gas to swim in the water surface so that it is black.Dark brown to refer to nitrification process in reaction tank too fast, makes the mixed liquor containing a large amount of nitrate anions enter second pond, activated sludge generation anti-nitration reaction, the N of generation2Alive its is made to swim in the water surface so that it is to produce dark brown.
Filamentous microorganism is primarily referred to as the filamentous microorganism with very hydrophobic cell surface, mainly includes Nocardia Pseudomonas, M.parvicella Pseudomonas etc..
Compared with prior art, the invention has the beneficial effects as follows:
(1) initial stage occurred at Mud up-floating carries out early warning, takes different countermeasures respectively, is eliminated in original state, probability that Mud up-floating occur can be greatly decreased, be practicable cost-effective method.
(2) by three grades of early warning systems, Mud up-floating being taked different control measure, sewage treatment plant operating cost can be greatly reduced and expense puts into, treatment effect is preferable.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described, but the present invention is not limited to following example.
Embodiment 1, a kind of sewage disposal system second pond Mud up-floating early warning and control method, its step is as follows:
(1) the early warning classification that second pond Mud up-floating occurs in sewage disposal system is set up；Account for black quantity and the accounting of dark brown quantity in the ratio i.e. coverage of cell body surface area, activated sludge color according to second pond floating sludge area coverage, filamentous microorganism quantity is partitioning standards, is divided into three grades；Wherein:
When in second pond floating sludge coverage less than 30%, activated sludge color, black quantity accounted for for more than 70% (containing), filamentous microorganism negligible amounts is first-degree alert, and this rank is Mud up-floating early period of origination；
When in second pond floating sludge coverage 30% ~ 50%, activated sludge color dark brown quantity account for more than 70% (containing) and less than 90%, filamentous microorganism quantity mostly relatively be two grades of warnings, this rank is Mud up-floating period of expansion, and needs take appropriate measures and are controlled；
Being much three grades of warnings when in second pond floating sludge coverage more than 50%, activated sludge color, dark brown quantity accounts for more than 90% (containing), filamentous microorganism quantity, this rank is the serious phase of Mud up-floating, need to take appropriate measures and be controlled；
Described filamentous microorganism negligible amounts refers to thread mycelia, is incidentally present of in some flco；Quantity is more to be referred in all flcos with the presence of thread mycelia, 5 ~ 20 mycelia/flcos；Quantity much refer to thread mycelia far more than flco, 20 ~ 100 mycelia/flcos；
(2) according to early warning classification, following methods is used to be controlled:
When first-degree alert, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 1:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 0.5:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 2mg/L；
When guarding against for two grades, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 3:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 1:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 2mg/L；
4. 5 mg/L antibacterial are added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age；
When guarding against for three grades, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 5:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 2:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 2mg/L；
4. the antibacterial of 10mg/L is added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age.
Embodiment 2, a kind of sewage disposal system second pond Mud up-floating early warning described in embodiment 1 and control method, its step is as follows:
(1) the early warning classification that second pond Mud up-floating occurs in sewage disposal system is set up；Method is with embodiment 1；
(2) according to early warning classification, following methods is used to be controlled:
When first-degree alert, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 3:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 1:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 4mg/L；
When guarding against for two grades, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 5:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 2:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 4mg/L；
4. 5 ~ 10mg/L antibacterial is added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age；
When guarding against for three grades, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 7:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 3:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 4mg/L；
4. the antibacterial of 15mg/L is added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age.
Embodiment 3, a kind of sewage disposal system second pond Mud up-floating early warning described in embodiment 1 and control method, its step is as follows:
(1) the early warning classification that second pond Mud up-floating occurs in sewage disposal system is set up；Method is with embodiment 1；
(2) according to early warning classification, following methods is used to be controlled:
When first-degree alert, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 1.5:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 0.6:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 2.5mg/L；
When guarding against for two grades, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 3.5:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 1.3:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 2.5mg/L；
4. 6mg/L antibacterial is added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age；
When guarding against for three grades, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 5.5:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 2.3:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 2.5mg/L；
4. the antibacterial of 12mg/L is added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age.
Embodiment 4, a kind of sewage disposal system second pond Mud up-floating early warning described in embodiment 1 and control method, its step is as follows:
(1) the early warning classification that second pond Mud up-floating occurs in sewage disposal system is set up；Method is with embodiment 1；
(2) according to early warning classification, following methods is used to be controlled:
When first-degree alert, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 2.5:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 0.8:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 3.5mg/L；
When guarding against for two grades, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 4.5:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 1.7:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 3.5mg/L；
4. 8mg/L antibacterial is added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age；
When guarding against for three grades, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 6.5:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 2.7:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 3.5mg/L；
4. the antibacterial of 14mg/L is added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age.
Embodiment 5, a kind of sewage disposal system second pond Mud up-floating early warning described in embodiment 1 and control method, its step is as follows:
(1) the early warning classification that second pond Mud up-floating occurs in sewage disposal system is set up；Method is with embodiment 1；
(2) according to early warning classification, following methods is used to be controlled:
When first-degree alert, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 2:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 0.7:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 3mg/L；
When guarding against for two grades, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 4:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 1.5:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 3mg/L；
4. 7mg/L antibacterial is added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age；
When guarding against for three grades, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 6:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 2.5:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 3mg/L；
4. the antibacterial of 13mg/L is added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age.
In embodiment 6, sewage disposal system second pond Mud up-floating early warning described in embodiment 1-5 any one and control method: one or more in sodium hypochlorite, hydrogen peroxide, copper sulfate, liquid chlorine, chlorine dioxide, bleaching powder of described antibacterial.
Embodiment 7, sewage disposal system second pond Mud up-floating early warning and control method experiment one:
Certain construction waste water treating stations Design Treatment amount is 4500m3/ d, owing to being not set up early warning mechanism, in November, 2013 breaks out sludge bulking, and second pond has a large amount of mud to cover, mud coverage 50%, and mud is many in black.System mixed liquid recycle ratio 3:1, return sludge ratio 1:1, microscopy filamentous bacteria is more, and the many and quantity of flco, now system has reached three grades of warnings.
The measure taked is the second pond excess sludge discharge amount that first strengthens, and reduces sludge age, and next tunes up nitrification liquid backflow, maintains mixed liquid recycle ratio 5:1, tunes up second pond sludge reflux pump, return sludge ratio 2:1.The strict Aerobic Pond aeration rate that controls is 2mg/L ~ 4mg/L, adds the sodium hypochlorite of 10mg/L simultaneously.After dosing, filamentous bacteria gradually decreases, and zoogloea gradually recovers, and the mud overlay capacity on second pond surface gradually decreases, until disappearing, the pre-warning and control method of the present invention is effectively controlled Mud up-floating phenomenon.
Claims (8)
1. a sewage disposal system second pond Mud up-floating early warning and control method, it is characterised in that its step is as follows:
(1) the early warning classification that second pond Mud up-floating occurs in sewage disposal system is set up；Account for black quantity and the accounting of dark brown quantity in the ratio i.e. coverage of cell body surface area, activated sludge color according to second pond floating sludge area coverage, filamentous microorganism quantity is partitioning standards, is divided into three grades；Wherein:
When in second pond floating sludge coverage less than 30%, activated sludge color, black quantity accounts for more than 70%, filamentous microorganism negligible amounts is first-degree alert, and this rank is Mud up-floating early period of origination；
When in second pond floating sludge coverage 30% ~ 50%, activated sludge color, dark brown quantity accounts for 70% less than 90%, filamentous microorganism quantity mostly relatively is two grades of warnings, and this rank is Mud up-floating period of expansion, and needing takes appropriate measures is controlled；
When in second pond floating sludge coverage more than 50%, activated sludge color, dark brown quantity accounts for more than 90%, filamentous microorganism quantity is much three grades of warnings, and this rank is the serious phase of Mud up-floating, need to take appropriate measures and be controlled；
Described filamentous microorganism negligible amounts refers to thread mycelia, is incidentally present of in some flco；Quantity is more to be referred in all flcos with the presence of thread mycelia, 5 ~ 20 mycelia/flcos；Quantity much refer to thread mycelia far more than flco, 20 ~ 100 mycelia/flcos；
(2) according to early warning classification, following methods is used to be controlled:
When first-degree alert, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 1 ~ 3:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 0.5 ~ 1:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 2 ~ 4mg/L；
When guarding against for two grades, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 3 ~ 5:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 1 ~ 2:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 2 ~ 4mg/L；
4. 5 ~ 10mg/L antibacterial is added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age；
When guarding against for three grades, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 5 ~ 7:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 2 ~ 3:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 2 ~ 4mg/L；
4. the antibacterial of 10 ~ 15mg/L is added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age.
Sewage disposal system second pond Mud up-floating early warning the most according to claim 1 and control method, it is characterised in that: one or more in sodium hypochlorite, hydrogen peroxide, copper sulfate, liquid chlorine, chlorine dioxide, bleaching powder of described antibacterial.
Sewage disposal system second pond Mud up-floating early warning the most according to claim 1 and 2 and control method, it is characterised in that: in step (2), when first-degree alert, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 1.5 ~ 2.5:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 0.6 ~ 0.8:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 2.5 ~ 3.5mg/L.
Sewage disposal system second pond Mud up-floating early warning the most according to claim 3 and control method, it is characterised in that: in step (2), when first-degree alert, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 2:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 0.7:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 3mg/L.
Sewage disposal system second pond Mud up-floating early warning the most according to claim 1 and 2 and control method, it is characterised in that: in step (2), when guarding against for two grades, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 3.5 ~ 4.5:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 1.3 ~ 1.7:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 2.5 ~ 3.5mg/L；
4. 6 ~ 8mg/L antibacterial is added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age.
Sewage disposal system second pond Mud up-floating early warning the most according to claim 5 and control method, it is characterised in that: in step (2), when guarding against for two grades, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 4:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 1.5:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 3mg/L；
4. 7mg/L antibacterial is added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age.
Sewage disposal system second pond Mud up-floating early warning the most according to claim 1 and 2 and control method, it is characterised in that: in step (2), when guarding against for three grades, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 5.5 ~ 6.5:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 2.3 ~ 2.7:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 2.5 ~ 3.5mg/L；
4. the antibacterial of 12 ~ 14mg/L is added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age.
Sewage disposal system second pond Mud up-floating early warning the most according to claim 7 and control method, it is characterised in that: in step (2), when guarding against for three grades, use following control method:
1. tune up nitrification liquid reflux pump, make mixed liquid recycle ratio maintain 6:1；
2. tune up second pond sludge reflux pump, make return sludge ratio maintain 2.5:1；
3. reduce Aerobic Pond bio-aeration amount, make dissolved oxygen concentration maintain 3mg/L；
4. the antibacterial of 13mg/L is added at Aerobic Pond, to control the quantity of filamentous microorganism；
5. strengthen second pond excess sludge discharge amount, shorten sludge age.
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