CN109912010A - A kind of residual active sludge depth process decrement method - Google Patents
A kind of residual active sludge depth process decrement method Download PDFInfo
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Abstract
The present invention relates to field of solid waste treating technology, specially a kind of residual active sludge depth process decrement method.The problems such as inefficient, stability is poor, energy consumption is high or consumption of chemical agent is big is reduced during mud decrement in the prior art in order to overcome.The present invention, which is combined using the embedded pyrohydrolysis sludge disintegration technology of biochemical system with biologic packing material, realizes activated sludge depth process decrement.Residue biochemical sludge process Decrement Technique of the present invention has the advantages that reduced training is good, processing cost is low etc., and there are the advantages such as mature and reliable and process be simple, it can be effectively reduced organic matter percentage in residual active sludge, residual active sludge amount and processing cost is greatly lowered, there is preferable economy and application value.
Description
Technical field
The present invention relates to field of solid waste treating technology, are a kind of residual active sludge depth process decrement method,
Specially a kind of combined using the embedded pyrohydrolysis sludge disintegration technology of biochemical system with biologic packing material realizes that activated sludge is deep
The method for spending journey decrement.
Background technique
Activated sludge process is current most widely used sewage water treatment method, utilizes the biological flocculation and precipitation of activated sludge, absorption
And oxidation, the organic pollutant in removal sewage is decomposed, the remarkable advantages such as low, high-efficient with processing cost.But in work
Property sludge processing sewage during can also generate a large amount of residual active sludges simultaneously, residual active sludge is one kind by organic matter
The extremely complex heterogeneous body of the compositions such as matter relic, microorganism, inorganic particle and colloid.
With the increase of wastewater treatment in China amount, residual active sludge amount has broken through 30,000,000 t/a (moisture content 80%).Mesh
Before, common residual active sludge processing method mainly has land use, landfill, heat treatment, burning and resource both at home and abroad
Change utilizes.For developed country, the residual active sludge disposition in China falls behind relatively, due to relevant criterion body
Make the processing still unsound, residual active sludge is caused not standardize largely.
Residual active sludge contains the poisonous and harmful substances such as pathogen, heavy metal and persistent organism, without effectively locating
Reason is discharged into environment, easily causes secondary pollution, direct threatening environment safety and public health to underground water, soil etc..Cause
How this, effectively handle the problem of residual active sludge is China's urgent need to resolve.
Sludge reduction is by the means using physics, chemistry and biochemistry, so that entire sewage disposal system is to outlet
The biosolids amount put reaches minimum.It fundamentally reduces sludge quantity technology more and more to be paid attention to, while mud decrement
The research of technology is also to realize the necessary ways of sewage sludge harmlessness and recycling.Common sludge reduction technology mainly has biochemistry
Method, acid-base method, chemical oxidization method, heat treating process, Ultrasonic treatment and sludge process Subtraction method etc. advantageously reduce dirt after dehydration
The content of organic matter and moisture percentage in sewage sludge in mud, to realize sludge reduction.
Activated sludge process decrement be by means such as physics, chemistry, biologies, rely primarily on reduce microorganism yield and
It is breathed using microorganism own endogenous and carries out oxygenolysis, the biosolids amount for discharging sewage treatment facility outward reaches most
It is small.The mode that patent 1 (CN102145972) gives the addition uncoupler into biochemical treatment system realizes mud decrement side
Method.Patent 2 (CN103304036), which gives, increases method of the biologic packing material to realize mud decrement in system.Patent 3
(CN101759338), patent 4 (CN102910794), patent 5 (CN103214091) and patent 6 (CN105693058) are given respectively
Go out and to carry out after sludge disintegration the side that mud decrement is realized in biochemical treatment again using Ozone, chemical method and pyrohydrolytic method
Method.And patent 7 (CN102897913) and patent 8 (CN102701514) give increase bypass biochemical system and realize mud decrement
Method.Above-mentioned patent has certain reduced training, but there is be reduced during mud decrement inefficient, stability is poor,
The problems such as energy consumption is high or consumption of chemical agent is big.
Summary of the invention
The technical problem to be solved in the present invention:
It is reduced that inefficient, stability is poor, energy consumption is high or chemical drugs during mud decrement in the prior art to overcome
The problems such as agent dosage is big.The present invention combines realization with biologic packing material using the embedded pyrohydrolysis sludge disintegration technology of biochemical system
Residual active sludge depth process decrement.The embedded pyrohydrolysis sludge disintegration technology of biochemical system is used the present invention provides a kind of
It is combined with biologic packing material, effectively improve mud decrement rate and reduces the sludge reduction method of sludge reduction processing cost.
To achieve the above objectives, the technical solution adopted by the present invention is that:
A kind of residual active sludge depth process decrement method, includes the following steps:
(1) sewage enters the progress biochemical treatment of biochemical wastewater treatment system 1, fills in the biochemical wastewater treatment system 1
There is hydrophily biologic packing material；
(2) residual active sludge after step (1) biochemical treatment enters residual active sludge concentration systems 2, after concentration
Sludge concentration claimed range is 5~30g/L, and the residual active sludge after a part concentration enters dehydrating residual active sludge system
3 are carried out dehydrating, and obtained dewatered sludge 8 carries out outward transport disposition；
(3) residual active sludge in step (2) after another part concentration enters sludge heat-exchange system 4, with low-temperature water heating
It solves the sludge in reaction system 6 after Low Temperature Thermal hydrolysis and carries out sludge heat exchange processing, reach heating and the low temperature of residual active sludge
The cooling purpose of sludge after pyrohydrolysis, and be conducive to thermal energy recycling with it is energy-saving, remaining after heat exchange processing heating lives
Property sludge enter sludge heating system 5, heated and be warming up to low temperature hydrolysis react required for temperature；
(4) residual active sludge in step (3) after heating enters Low Temperature Thermal hydrolysising reacting system 6, under heat-retaining condition
Reaction is hydrolyzed；
(5) residual active sludge in step (4) after hydrolysis is introduced into the residual activity after sludge heat-exchange system 4 and concentration
After sludge is exchanged heat, sludge cooling system 7 is entered back into, continues cool to set temperature through recirculated cooling water；
(6) enter biochemical wastewater treatment system 1 after residual active sludge after cooling is mixed with sewage in step (5) together
It is handled, constantly reduces the content of organic matter in sludge in biochemical wastewater treatment system 1.
On the basis of above scheme, hydrophily biologic packing material described in step (1) can be suspension type hydroformylation polyvinyl silk
Filler, or polyethylene, polypropylene or the polyurethane floating stuffing of hydrophilic modifying.
On the basis of above scheme, hydrophily biologic packing material packing volume ratio in biochemical wastewater treatment system 1
Example is 20~50%, and preferred scope is 30~40%.
It is dirty to enter residual activity in dehydrating residual active sludge system 3 on the basis of above scheme, described in step (2)
Mud percentage is into the 10~60% of residual active sludge concentration systems 2, and preferred scope is 20~50%.
On the basis of above scheme, sludge heating temperature range described in step (3) is 50~100 DEG C, preferred scope
It is 60~95 DEG C；Sludge heating can be using thermal mediums such as steam, conduction oil or boiler smokes.
On the basis of above scheme, heat-retaining condition described in step (4) is using tank body external thermal insulation, and tank body is outside using warm
Source heating maintains the temperature after the heated heating of residual active sludge, that is, how many temperature of coming in, and temperature keeps similar temperature, the temperature difference
Range is ± 5 DEG C, and highest holding temperature is no more than 100 DEG C；When residual active sludge temperature after heat temperature raising is 100 DEG C,
The temperature difference range is in -5 DEG C.
On the basis of above scheme, hydrolysis time described in step (4) is 2~10h, and the preferably time is 3~9h.
On the basis of above scheme, recirculated cooling water described in step (5) continues cool to 20~45 DEG C, preferred scope
It is 25~40 DEG C.
The beneficial effects of the present invention are:
The present invention provides a kind of residual active sludge depth process decrement method, the good, processing cost with reduced training
Low advantage, and there are the advantages such as technology maturation is reliable and process is simple, it can be effectively reduced organic matter in residual active sludge
Residual active sludge amount and processing cost is greatly lowered in percentage, has preferable economy and application value.
Detailed description of the invention
The present invention has following attached drawing:
Fig. 1 residual active sludge depth process decrement process flow diagram.
In figure: 1 is biochemical wastewater treatment system；2 be residual active sludge concentration systems；3 be dehydrating residual active sludge
System；4 be sludge heat-exchange system；5 be sludge heating system；6 be Low Temperature Thermal hydrolysising reacting system；7 be sludge cooling system；8
For dewatered sludge.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
As shown in Figure 1, a kind of embodiment of residual active sludge depth process decrement method of the present invention is as follows:
(1) sewage enters the progress biochemical treatment of biochemical wastewater treatment system 1, is filled with parent in biochemical wastewater treatment system 1
Aqueous biological filler can be suspension type hydroformylation polyvinyl silk filler, or polyethylene, polypropylene or the poly- ammonia of hydrophilic modifying
Ester floating stuffing, packing volume ratio is 20~50% in biochemical wastewater treatment system 1, and preferred scope is 30~40%；
(2) residual active sludge after step (1) biochemical treatment enters residual active sludge concentration systems 2, after concentration
Sludge concentration claimed range is 5~30g/L, and the residual active sludge after a part concentration enters dehydrating residual active sludge system
3 are carried out dehydrating, and obtained dewatered sludge 8 carries out outward transport disposition.Into residual activity in dehydrating residual active sludge system 3
Sludge percentage is into the 10~60% of residual active sludge concentration systems 2, and preferred scope is 20~50%；
(3) residual active sludge in step (2) after another part concentration enters sludge heat-exchange system 4, with low-temperature water heating
It solves the sludge in reaction system 6 after Low Temperature Thermal hydrolysis and carries out sludge heat exchange processing, the residual activity after heat exchange processing heating is dirty
Mud enters back into sludge heating system 5 and carries out heating treatment, and the temperature range after sludge is heated is 50~100 DEG C, preferred scope
It is 60~95 DEG C；Sludge heating can be using thermal mediums such as steam, conduction oil or boiler smokes；
(4) residual active sludge in step (3) after heating enters Low Temperature Thermal hydrolysising reacting system 6, under heat-retaining condition
Reaction is hydrolyzed, hydrolysis time is 2~10h, and the preferably time is 3~9h；
(5) residual active sludge in step (4) after hydrolysis enters sludge heat-exchange system 4, with the residual activity after concentration
After sludge is exchanged heat, sludge cooling system 7 is entered back into, then continues cool to 20~45 DEG C through recirculated cooling water again, preferably
Range is 25~40 DEG C；
(6) enter biochemical wastewater treatment system 1 after residual active sludge after cooling is mixed with sewage in step (5) together
It is handled, constantly reduces the content of organic matter in sludge in biochemical wastewater treatment system 1.
Embodiment 1
Residual active sludge characteristic: certain sewage treatment plant biochemical processing process sludge concentration tank sludge 1m3, sludge index
Are as follows: mix suspending solid concentration (MLSS) is 16.8g/L, and mixed liquor volatile suspended solid, MLVSS concentration (MLVSS) is 11.9g/L,
Organic matter percentage is 70.8%.
Above-mentioned residual active sludge processing implementation steps are as follows:
(1) sewage enters biochemical wastewater treatment system 1, is filled with hydrophily biologic packing material in biochemical wastewater treatment system 1,
Packing volume ratio is 30% in biochemical wastewater treatment system 1, and biologic packing material is the polyurethane cellular floating stuffing of hydrophilic modifying；
(2) residual active sludge after step (1) biochemical treatment enters residual active sludge concentration systems 2, a part
Residual active sludge after concentration enters dehydrating residual active sludge system 3, and obtained dewatered sludge 8 carries out outward transport disposition.Into
Entering residual active sludge percentage in dehydrating residual active sludge system 3 is into the 50% of residual active sludge concentration systems 2；
(3) residual active sludge in step (2) after another part concentration enters sludge 4 systems of heat exchange and sludge heating system
System 5, carries out the processing of sludge heat temperature raising, and the temperature after sludge heating is 90 DEG C；Sludge heating uses steam；
(4) residual active sludge in step (3) after heating enters Low Temperature Thermal hydrolysising reacting system 6, under heat-retaining condition
Reaction, hydrolysis time 6h is hydrolyzed；
(5) residual active sludge in step (4) after hydrolysis is introduced into the residual activity after sludge heat-exchange system 4 and concentration
Sludge exchanges heat, and then enters back into sludge cooling system 7, continues cool to 25 DEG C by recirculated cooling water；
(6) enter biochemical wastewater treatment system 1 after residual active sludge after cooling is mixed with sewage in step (5) together
It is handled, constantly reduces the content of organic matter in sludge in biochemical wastewater treatment system 1.
8 characteristic of dewatered sludge: moisture content 73.2%, organic matter percentage are 51.5%, gross mass 38.3kg, sludge matter
Measuring overall reduction rate is 96.17%.
Embodiment 2
Residual active sludge characteristic: certain sewage treatment plant biochemical processing process sludge concentration tank sludge 1m3, sludge index
Are as follows: mix suspending solid concentration (MLSS) is 16.8g/L, and mixed liquor volatile suspended solid, MLVSS concentration (MLVSS) is 11.9g/L,
Organic matter percentage is 70.8%.
Above-mentioned residual active sludge processing implementation steps are as follows:
(1) sewage enters biochemical wastewater treatment system 1, is filled with hydrophily biologic packing material in biochemical wastewater treatment system 1,
Packing volume ratio is 20% in biochemical wastewater treatment system 1, and biologic packing material is the polyethylene floating stuffing of hydrophilic modifying；
(2) residual active sludge after step (1) biochemical treatment enters residual active sludge concentration systems 2, a part
Residual active sludge after concentration enters dehydrating residual active sludge system 3, and obtained dewatered sludge 8 carries out outward transport disposition.Into
Entering residual active sludge percentage in dehydrating residual active sludge system 3 is into the 40% of residual active sludge concentration systems 2；
(3) residual active sludge in step (2) after another part concentration enters sludge 4 systems of heat exchange and sludge heating system
System 5, sludge heating temperature are 50 DEG C；Sludge heating uses boiler smoke；
(4) residual active sludge in step (3) after heating enters Low Temperature Thermal hydrolysising reacting system 6, under heat-retaining condition
Reaction, hydrolysis time 10h is hydrolyzed；
(5) residual active sludge in step (4) after hydrolysis is introduced into the residual activity after sludge heat-exchange system 4 and concentration
Sludge exchanges heat, and then enters back into sludge cooling system 7, continues cool to 20 DEG C by recirculated cooling water；
(6) enter biochemical wastewater treatment system 1 after residual active sludge after cooling is mixed with sewage in step (5) together
It is handled, constantly reduces the content of organic matter in sludge in biochemical wastewater treatment system 1.
8 characteristic of dewatered sludge: moisture content 73.9%, organic matter percentage are 53.2%, gross mass 40.2kg, sludge matter
Measuring overall reduction rate is 95.98%.
Embodiment 3
Residual active sludge characteristic: certain sewage treatment plant biochemical processing process sludge concentration tank sludge 1m3, sludge index
Are as follows: mix suspending solid concentration (MLSS) is 16.8g/L, and mixed liquor volatile suspended solid, MLVSS concentration (MLVSS) is 11.9g/L,
Organic matter percentage is 70.8%.
Above-mentioned residual active sludge processing implementation steps are as follows:
(1) sewage enters biochemical wastewater treatment system 1, is filled with hydrophily biologic packing material in biochemical wastewater treatment system 1,
Packing volume ratio is 50% in biochemical wastewater treatment system 1, and biologic packing material is the polypropylene suspension filler of hydrophilic modifying；
(2) residual active sludge after step (1) biochemical treatment enters residual active sludge concentration systems 2, a part
Residual active sludge after concentration enters dehydrating residual active sludge system 3, and obtained dewatered sludge 8 carries out outward transport disposition.Into
Entering residual active sludge percentage in dehydrating residual active sludge system 3 is into the 20% of residual active sludge concentration systems 2；
(3) residual active sludge in step (2) after another part concentration enters sludge 4 systems of heat exchange and sludge heating system
System 5, sludge heating temperature are 100 DEG C；Sludge heating uses conduction oil；
(4) residual active sludge in step (3) after heating enters Low Temperature Thermal hydrolysising reacting system 6, under heat-retaining condition
Reaction, hydrolysis time 2h is hydrolyzed；
(5) residual active sludge in step (4) after hydrolysis is introduced into the residual activity after sludge heat-exchange system 4 and concentration
Sludge exchanges heat, and then enters back into sludge cooling system 7, continues cool to 40 DEG C by recirculated cooling water；
(6) enter biochemical wastewater treatment system 1 after residual active sludge after cooling is mixed with sewage in step (5) together
It is handled, constantly reduces the content of organic matter in sludge in biochemical wastewater treatment system 1.
8 characteristic of dewatered sludge: moisture content 73.8%, organic matter percentage are 52.3%, gross mass 39.8kg, sludge matter
Measuring overall reduction rate is 96.02%.
Embodiment 4
Residual active sludge characteristic: certain sewage treatment plant biochemical processing process sludge concentration tank sludge 1m3, sludge index
Are as follows: mix suspending solid concentration (MLSS) is 16.8g/L, and mixed liquor volatile suspended solid, MLVSS concentration (MLVSS) is 11.9g/L,
Organic matter percentage is 70.8%.
Above-mentioned residual active sludge processing implementation steps are as follows:
(1) sewage enters biochemical wastewater treatment system 1, is filled with hydrophily biologic packing material in biochemical wastewater treatment system 1,
Packing volume ratio is 40% in biochemical wastewater treatment system 1, and biologic packing material is suspension type hydroformylation polyvinyl silk filler；
(2) residual active sludge after step (1) biochemical treatment enters residual active sludge concentration systems 2, a part
Residual active sludge after concentration enters dehydrating residual active sludge system 3, and obtained dewatered sludge 8 carries out outward transport disposition.Into
Entering residual active sludge percentage in dehydrating residual active sludge system 3 is into the 10% of residual active sludge concentration systems 2；
(3) residual active sludge in step (2) after another part concentration enters sludge 4 systems of heat exchange and sludge heating system
System 5, sludge heating temperature are 95 DEG C；Sludge heating uses steam；
(4) residual active sludge in step (3) after heating enters Low Temperature Thermal hydrolysising reacting system 6, under heat-retaining condition
Reaction, hydrolysis time 9h is hydrolyzed；
(5) residual active sludge in step (4) after hydrolysis is introduced into the residual activity after sludge heat-exchange system 4 and concentration
Sludge exchanges heat, and then enters back into sludge cooling system 7, continues cool to 45 DEG C by recirculated cooling water；
(6) enter biochemical wastewater treatment system 1 after residual active sludge after cooling is mixed with sewage in step (5) together
It is handled, constantly reduces the content of organic matter in sludge in biochemical wastewater treatment system 1.
8 characteristic of dewatered sludge: moisture content 74.1%, organic matter percentage are 52.6%, gross mass 40.6kg, sludge matter
Measuring overall reduction rate is 95.94%.
Embodiment 5
Residual active sludge characteristic: certain sewage treatment plant biochemical processing process sludge concentration tank sludge 1m3, sludge index
Are as follows: mix suspending solid concentration (MLSS) is 16.8g/L, and mixed liquor volatile suspended solid, MLVSS concentration (MLVSS) is 11.9g/L,
Organic matter percentage is 70.8%.
Above-mentioned residual active sludge processing implementation steps are as follows:
(1) sewage enters biochemical wastewater treatment system 1, is filled with hydrophily biologic packing material in biochemical wastewater treatment system 1,
Packing volume ratio is 30% in biochemical wastewater treatment system 1, and biologic packing material is the polyurethane filler of hydrophilic modifying；
(2) residual active sludge after step (1) biochemical treatment enters residual active sludge concentration systems 2, a part
Residual active sludge after concentration enters dehydrating residual active sludge system 3, and obtained dewatered sludge 8 carries out outward transport disposition.Into
Entering residual active sludge percentage in dehydrating residual active sludge system 3 is into the 30% of residual active sludge concentration systems 2；
(3) residual active sludge in step (2) after another part concentration enters sludge 4 systems of heat exchange and sludge heating system
System 5, sludge heating temperature are 80 DEG C；Sludge heating uses conduction oil；
(4) residual active sludge in step (3) after heating enters Low Temperature Thermal hydrolysising reacting system 6, under heat-retaining condition
Reaction, hydrolysis time 8h is hydrolyzed；
(5) residual active sludge in step (4) after hydrolysis is introduced into the residual activity after sludge heat-exchange system 4 and concentration
Sludge exchanges heat, and then enters back into sludge cooling system 7, continues cool to 30 DEG C by recirculated cooling water；
(6) enter biochemical wastewater treatment system 1 after residual active sludge after cooling is mixed with sewage in step (5) together
It is handled, constantly reduces the content of organic matter in sludge in biochemical wastewater treatment system 1.
8 characteristic of dewatered sludge: moisture content 73.2%, organic matter percentage are 51.7%, gross mass 38.5kg, sludge matter
Measuring overall reduction rate is 96.15%.
Embodiment 6
Residual active sludge characteristic: certain sewage treatment plant biochemical processing process sludge concentration tank sludge 1m3, sludge index
Are as follows: mix suspending solid concentration (MLSS) is 16.8g/L, and mixed liquor volatile suspended solid, MLVSS concentration (MLVSS) is 11.9g/L,
Organic matter percentage is 70.8%.
Above-mentioned residual active sludge processing implementation steps are as follows:
(1) sewage enters biochemical wastewater treatment system 1, is filled with hydrophily biologic packing material in biochemical wastewater treatment system 1,
Packing volume ratio is 20% in biochemical wastewater treatment system 1, and biologic packing material is the polypropylene suspension filler of hydrophilic modifying；
(2) residual active sludge after step (1) biochemical treatment enters residual active sludge concentration systems 2, a part
Residual active sludge after concentration enters dehydrating residual active sludge system 3, and obtained dewatered sludge 8 carries out outward transport disposition.Into
Entering residual active sludge percentage in dehydrating residual active sludge system 3 is into the 60% of residual active sludge concentration systems 2；
(3) residual active sludge in step (2) after another part concentration enters sludge 4 systems of heat exchange and sludge heating system
System 5, sludge heating temperature are 100 DEG C；Sludge heating uses conduction oil；
(4) residual active sludge in step (3) after heating enters Low Temperature Thermal hydrolysising reacting system 6, under heat-retaining condition
Reaction, hydrolysis time 3h is hydrolyzed；
(5) residual active sludge in step (4) after hydrolysis is introduced into the residual activity after sludge heat-exchange system 4 and concentration
Sludge exchanges heat, and then enters back into sludge cooling system 7, continues cool to 35 DEG C by recirculated cooling water；
(6) enter biochemical wastewater treatment system 1 after residual active sludge after cooling is mixed with sewage in step (5) together
It is handled, constantly reduces the content of organic matter in sludge in biochemical wastewater treatment system 1.
8 characteristic of dewatered sludge: moisture content 73.7%, organic matter percentage are 52.2%, gross mass 39.6kg, sludge matter
Measuring overall reduction rate is 96.04%.
Comparative example 1
Residual active sludge characteristic: certain sewage treatment plant biochemical processing process sludge concentration tank sludge 1m3, sludge index
Are as follows: mix suspending solid concentration (MLSS) is 16.8g/L, and mixed liquor volatile suspended solid, MLVSS concentration (MLVSS) is 11.9g/L,
Organic matter percentage is 70.8%.
Above-mentioned residual active sludge processing implementation steps are as follows:
(1) residual active sludge enters residual active sludge concentration systems 2, and whole residual active sludges enter residual activity
Sludge dewatering system 3；
(2) dewatered sludge 8 carries out outward transport disposition.
8 characteristic of dewatered sludge: moisture content 85.1%, organic matter percentage are 70.8%, gross mass 114.5kg, sludge
Quality totality reduction rate is 88.55%.
The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (9)
1. a kind of residual active sludge depth process decrement method, characterized by the following steps:
(1) sewage enters the progress biochemical treatment of biochemical wastewater treatment system, is filled in the biochemical wastewater treatment system hydrophilic
Property biologic packing material；
(2) residual active sludge after step (1) biochemical treatment enters residual active sludge concentration systems, and sludge is dense after concentration
Degree claimed range is 5~30g/L, and the residual active sludge after a part concentration enters dehydrating residual active sludge system and taken off
Water process, obtained dewatered sludge carry out outward transport disposition；
(3) residual active sludge in step (2) after another part concentration enters sludge heat-exchange system, with Low Temperature Thermal hydrolysis
Sludge in system after Low Temperature Thermal hydrolysis carries out sludge heat exchange processing, and the residual active sludge after heat exchange processing heating enters dirt
Mud heating system is heated and is warming up to temperature required for low temperature hydrolysis reacts；
(4) residual active sludge in step (3) after heating enters Low Temperature Thermal hydrolysising reacting system, and water is carried out under heat-retaining condition
Solution reaction；
(5) residual active sludge in step (4) after hydrolysis is introduced into the residual active sludge after sludge heat-exchange system and concentration
After being exchanged heat, sludge cooling system is entered back into, continues cool to set temperature through recirculated cooling water；
(6) enter biochemical wastewater treatment system after residual active sludge after cooling is mixed with sewage in step (5) together to carry out
Processing constantly reduces the content of organic matter in sludge in biochemical wastewater treatment system.
2. residual active sludge depth process decrement method as described in claim 1, it is characterised in that: described in step (1)
Hydrophily biologic packing material is suspension type hydroformylation polyvinyl silk filler, polyethylene, polypropylene or the polyurethane floating stuffing of hydrophilic modifying.
3. residual active sludge depth process decrement method as claimed in claim 2, it is characterised in that: the hydrophily biology
Filler packing volume ratio in biochemical wastewater treatment system is 20~50%.
4. residual active sludge depth process decrement method as described in claim 1, it is characterised in that: described in step (2)
Into residual active sludge percentage in dehydrating residual active sludge system be into residual active sludge concentration systems 10~
60%.
5. residual active sludge depth process decrement method as described in claim 1, it is characterised in that: described in step (3)
Sludge heating temperature range is 50~100 DEG C.
6. residual active sludge depth process decrement method as described in claim 1, it is characterised in that: sludge in step (3)
Heating uses steam, conduction oil or boiler smoke thermal medium.
7. residual active sludge depth process decrement method as described in claim 1, it is characterised in that: described in step (4)
Heat-retaining condition is using tank body external thermal insulation, and tank body uses heat source heating to maintain the temperature after the heated heating of residual active sludge outside
Degree, the temperature difference range are ± 5 DEG C, and highest holding temperature is no more than 100 DEG C.
8. residual active sludge depth process decrement method as described in claim 1, it is characterised in that: described in step (4)
Hydrolysis time is 2~10h.
9. residual active sludge depth process decrement method as described in claim 1, it is characterised in that: described in step (5)
Recirculated cooling water continues cool to 20~45 DEG C.
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