CN105254152A - Method for treating sludge in sewage treatment plant through ferrate - Google Patents
Method for treating sludge in sewage treatment plant through ferrate Download PDFInfo
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- CN105254152A CN105254152A CN201510757992.7A CN201510757992A CN105254152A CN 105254152 A CN105254152 A CN 105254152A CN 201510757992 A CN201510757992 A CN 201510757992A CN 105254152 A CN105254152 A CN 105254152A
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Abstract
The invention provides a method for treating sludge in a sewage treatment plant through ferrate and belongs to the technical field of sludge treatment. The method comprises the following steps that firstly, the sludge in the sewage treatment plant is added into a reaction tank; secondly, ferrate is added into the reaction tank; the sludge in the sewage treatment plant and ferrate are mixed for a reaction. According to the method, the sludge of the sewage treatment plant is treated through the functions such as oxidation and sedimentation of ferrate, organic matter, ammonia nitrogen, phosphorus and other substrates in the sludge are released, and thus the sludge can flow back to a treatment system of the sewage treatment plant so as to reduce discharge of the sludge of the sewage treatment plant. In addition, the method is simple in process and convenient to implement, the number of devices needing to the additionally arranged is not large, the treatment cost of the sludge in the sewage treatment plant can be reduced, and the method can be widely applied to various industrial and living sewage treatment systems.
Description
Technical field
The present invention relates to technical field of sludge treatment, in particular to a kind of method utilizing the mud of ferrate to sewage work to process.
Background technology
In recent years, along with Chinese Urbanization, industrializedly to develop rapidly, the water consumption of China increases greatly, and the quantity of consequent sewage is also in continuous growth simultaneously.Therefore, protect existing water resources, waste water is recycled and just seems particularly important.Along with the attention of Environmental pollution; the enhancing day by day of people's environmental consciousness; relevant policies constantly sound and perfect, sewage disposal is to realize non-pollution discharge or to recycle having very positive effect to the alleviation environmental problem of China and the problem of water resources anxiety.Pollutent in sewage has just forwarded in solid phase by liquid phase by existing sewage disposal, is then carried out by mud compressing, landfill.Such as, but containing materials such as a large amount of bacterium, viruses in mud, existing treatment process can not eliminate the pollutent in mud effectively, and landfill causes a large amount of problems, stench, soil and water pollution etc.
Summary of the invention
The object of the present invention is to provide a kind of method utilizing ferrate to carry out lignin-sludge, by utilizing ferrate lignin-sludge, the poisonous and harmful substances in mud can be reduced, thus realize low cost, efficiently sludge treatment object.
In one aspect, the invention provides
Utilize ferrate to a method for the mud of the treatment plant that disposes of sewage, comprise the following steps:
A) join in retort by the mud that sewage work produces, add ferrate, the injected volume of the ferro element in described ferrate in the mud of described sewage work is 0.001 ~ 500 μ g/mgSS;
B) mud of described sewage work and ferrate are mixed to carry out reaction 3-120 minute.
Preferably, be provided with agitator in described retort, step B) described in the mud of sewage work and the reaction process of described ferrate to described agitator Keep agitation, make the mud homogeneous of described ferrate and described sewage work.The Keep agitation of agitator makes the mud of sewage work more disperse, and the mud of sewage work can contact with high ferro acid group composition, and reaction site is more, reaction is more abundant.
Preferably, described step B) also comprise afterwards:
Step B) in the mud of described sewage work and after described ferrate reacts, pass into described sewage work and process, after process, discharge mud.
By the interaction between ferrate and mud, the materials such as the ammonia nitrogen among mud, phosphorus are able to be released in organism, and then pass into sewage work, through each sludge treating block process of non-processor factory, the sludge discharge making sewage work final reduces, thus the trouble of the process that the mud that sewage work can be avoided to discharge is too much or pollution substance too much causes.
Preferably, at described step C) after also comprise:
By step C) in sewage work process after discharge mud carry out processed.By processed, through the mud of the sewage work of ferrate process, its volume reduces greatly, convenient transport, landfill.
Preferably, described processed is specially: utilize whizzer or pressure filter to carry out processed.
Preferably, described ferrate is Na2Fe04 or potassium ferrate.The use cost of Na2Fe04, potassium ferrate is low, and it is convenient to store, and can reduce the processing cost of mud.
Preferably, described steps A) also comprise: in described retort, add pH adjusting agent, make the pH value in described retort reach 2 ~ 13.According to the character of mud, regulate pH adjusting agent, suitable by the mixture potential of hydrogen regulating pH adjusting agent to make mud and ferrate be formed, be convenient to the reaction of the mud of ferrate and sewage work.
Preferably, described pH adjusting agent is highly basic salt.
Preferably, described highly basic salt is KOH or NaOH.
Preferably, described pH adjusting agent comprises the one in hydrochloric acid, sulfuric acid, carbonic acid gas.
Preferably, described ferrate is solid or the aqueous solution.
Beneficial effect of the present invention:
1, after ferrate reduction, hydrolysis generates ferric ion, has the effects such as flocculation, absorption, co-precipitation, make the coagulations such as the heavy metal in mud, phosphorus, thus reach the effect of decrement due to ferric ion.
2, ferrate has stronger oxidation capacity, can be used in the various material with waste water and carries out oxygenizement.The strong oxidizing property of ferrate can destroy the enzyme in the cell walls of bacterium, cytolemma and cell, plays the effect of killing bacterium.Because various bacterium, microbes assemble various phosphorus, ammonia nitrogen, organism etc. in vivo, therefore traditional method cannot be discharged, and by the oxygenizement of ferrate, the various poisonous and harmful substances of material assembled in organism is released, carry out reprocessing by precipitation, flocculation or importing Sewage treatment systems again, thus lower the mud discharging of sewage work.
3, utilize the technique of ferrate lignin-sludge relatively simple, equipment investment is little, and the processing cost of mud reduces greatly, and the treatment effect of mud is good.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment below, be to be understood that, the following drawings illustrate only some embodiment of the present invention, therefore the restriction to scope should be counted as, for those of ordinary skill in the art, under the prerequisite not paying creative work, other relevant accompanying drawings can also be obtained according to these accompanying drawings.
What Fig. 1 provided for the embodiment of the present invention 1 utilizes ferrate to the schema of the method that the mud that sewage dispatches from the factory processes.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.The key element of the embodiment of the present invention describing and illustrate in usual accompanying drawing herein can arrange with various different configuration and design.Therefore, below to the detailed description of the embodiments of the invention provided in the accompanying drawings and the claimed scope of the present invention of not intended to be limiting, but selected embodiment of the present invention is only represented.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
At present, the active sludge through domestication is extensively adopted in the sewage treatment process of China, active sludge is the general name of microbial population and their organic substances of depending on and inorganic substance, and the microflora in active sludge can be used to process sanitary wastewater, trade effluent.The mud of sewage work is from the active sludge settling region discharge system in Sludge System.In the treating processes of active sludge, there is various biochemical reaction in the microorganism in active sludge, microorganism constantly consumes the organic substance in waste water, in the organic substance be consumed, a part is oxidized with the energy provided needed for microbial life activity, another part organic substance is then utilized to synthesize new tenuigenin by microorganism, make microbial proliferation reproduction, microorganism is metabolic while, some microbial death again, therefore sewage work needs periodic exhaustion mud, to maintain the microbial balance in active sludge.
The sludge quantity of discharging in sewage work is huge, it has stench, the bacterium containing more, the various pollutent such as virus and heavy metal, huge on the impact of environment and cost of its process is higher, particularly carrying out landfill disposal, there is the problem such as transport, storage in it.What this just made the mud of sewage work is treated as a ring the weakest in various Sewage treatment systems.In existing Sewage treatment systems, the mud of sewage work is all carry out landfill, and the various materials in the mud of therefore sewage work easily pollute, and intractability is large, cost is high.
What traditional sludge treatment way focused on mud subtracts appearance, but this adds increased the processing cost of mud, and subtracts to hold and fundamentally do not solving discharge, the process problem of mud.Present inventors have proposed a kind of method using ferrate to carry out mud, again can be imported in the treatment system of Sewage Plant by the mud after utilizing ferrate process and again process, the minimizing that can realize sewage plant sludge output even can realize the zero release of mud.
Embodiment 1
Present embodiments provide a kind of method utilizing the mud of ferrate to sewage work to process.This method for sludge treatment comprises the following steps:
The first step, the mud of sewage work to be joined in retort.
Have partial reflux to process in the mud of discharging after sewage work's process, some directly exports to outside Sewage treatment systems, carries out landfill.The method for sludge treatment provided in the present embodiment utilizes the ferrate factory that disposes of sewage to discharge and need carry out the mud of landfill, utilizes piping system to be transported in a retort by this mud.
Second step, in retort, add Na2Fe04 solid, the injected volume of the ferro element in Na2Fe04 in mud is 0.001 μ g/mgSS, and in the Na2Fe04 namely thrown in every milligram of dewatered sludge, the content of iron is 0.001 microgram.After adding Na2Fe04, in retort, add sodium hydroxide, make the pH value in retort reach 10.By adding sodium hydroxide to regulate the pH value in retort to reach processing requirements, keep the stable of pH value.
3rd step, make the mud of sewage work and Na2Fe04 mixing to react, the reaction times is 3 minutes.Because the exposure level between Na2Fe04 and the mud of sewage work has larger impact to sludge treatment effect, make both mixing more abundant by stirring, the mud of sewage work is fully contacted with Na2Fe04, thus make the reaction site of Na2Fe04 more, therefore various pollution substance can be eliminated.In retort, be provided with agitator, agitator is Keep agitation in the mud of sewage work and the reaction process of Na2Fe04, makes the mud homogeneous of Na2Fe04 and described sewage work.Preferably, before add Na2Fe04 in retort, agitator is stirred the mud of sewage work is fully disperseed, the mud of Na2Fe04 and the sewage work added subsequently is more easily mixed.Increase stirring frequency and the stirring intensity of agitator, the treatment effect of Na2Fe04 to the mud of sewage work can be improved.
After the mud of sewage work and high iron acid sodium reaction complete, the mixture that the mud of sewage work and Na2Fe04 are formed enters sewage work and again reacts, and has reacted rear discharge mud, then carries out processed to the mud of this discharge.
There is the water of various existence in mud, such as, part water is contained in the gap between mud granule; The kapillary formed between mud granule, by capillarity absorption portion water; The water of various material surface absorption in mud; In addition, in the inside of mud granule and various organism also containing part water.The existence of water in mud, makes the volume of mud comparatively large, is unfavorable for transport, process etc.Therefore, processed is carried out to mud, greatly can reduce the subsequent disposal difficulty of mud.In the present embodiment, first by precipitation, the water in mud is separated with solid matter, then utilizes whizzer (pressure filter also can be used to remove moisture), remove moisture further.
After above-mentioned treatment step, the free phosphorus in mud and the reduzate ferric iron in Na2Fe04 react and form tertiary iron phosphate and precipitate, and anti-water-stop body produces eutrophication.
Through the relevant nature of the mud of the sewage work of Na2Fe04 process and the mud of sewage work as table 1 below.
Table 1
Remarks: (SCOD, sollutedChemicaloxigendemand and solubility COD).
Embodiment 2
Present embodiments provide a kind of method of mud of utilize ferrate to dispose of sewage sewage work that factory discharges, this method for sludge treatment comprises the following steps:
First, the mud of the sewage work after Sewage Plant process is joined in retort, conveniently the follow-up process to mud, water can be added in retort, make that the mud of sewage work and ferrate are more convenient to be mixed.
Secondly in retort, add the aqueous solution of potassium ferrate, the injected volume of ferro element in potassium ferrate in the mud of sewage work is 0.1 μ g/mgSS, namely in the potassium ferrate thrown in every milligram of dewatered sludge, the content of iron is 0.1 microgram, after adding potassium ferrate, in retort, add carbonic acid gas, make the pH value in retort reach 6.4.
Again, make the mud of sewage work and potassium ferrate mixing to carry out reaction 120 minutes by continuous print stirring.
The mud of the sewage work after above-mentioned process can import in the treatment system of sewage work again, by Aerobic Pond, anaerobic pond and oxygen compatibility pool, active sludge is utilized to get rid of by the various materials discharged in the microbe be oxidized by potassium ferrate.
Through the relevant nature of the mud of the sewage work of potassium ferrate process and the mud of sewage work as table 2 below.
Table 2
Embodiment 3
Present embodiments provide a kind of method of mud of utilize ferrate to dispose of sewage sewage work that factory discharges, this method for sludge treatment comprises the following steps:
First, extract the dewatered sludge 10 kilograms of the sewage work that Sewage Plant is discharged, added in retort, add water formation fluid state.Secondly, in retort, add 108g potassium ferrate, then in retort, add hydrochloric acid, make the pH value in retort reach 4, stirred simultaneously by agitator to the mixture in retort, stir speed (S.S.) is 500r/min.Continuously stirring 30 minutes, makes the mud of sewage work and potassium ferrate fully react.
Through the relevant nature of the mud of the sewage work of potassium ferrate process and the mud of sewage work as table 3 below.
Table 3
Embodiment 4
Present embodiments provide a kind of method of mud of utilize ferrate to dispose of sewage sewage work that factory discharges, this method for sludge treatment comprises the following steps:
First, extract the dewatered sludge 10 kilograms of the sewage work that Sewage Plant is discharged, added in retort.Secondly, in retort add 1.8 kilograms of Na2Fe04s, then in retort, add hydrochloric acid, make the pH value in retort reach 2, stirred simultaneously by agitator to the mixture in retort, stir speed (S.S.) is 100r/min.Continuously stirring 42 minutes, makes the mud of sewage work and Na2Fe04 fully react.
Through the relevant nature of the mud of the sewage work of Na2Fe04 process and the mud of sewage work as table 4 below.
Table 4
Embodiment 5
Present embodiments provide a kind of method of mud of utilize ferrate to dispose of sewage sewage work that factory discharges, this method for sludge treatment comprises the following steps:
First, extract 5 kilograms, the mud of the sewage work that Sewage Plant is discharged, added in retort.Secondly, in retort add 2.5 kilograms of Na2Fe04s, then in retort, add sulfuric acid, make the pH value in retort reach 2.6, stirred simultaneously by agitator to the mixture in retort, stir speed (S.S.) is 100r/min.Continuously stirring 48 minutes, makes the mud of sewage work and Na2Fe04 fully react.
Through the relevant nature of the mud of the sewage work of Na2Fe04 process and the mud of sewage work as table 5 below.
Table 5
Embodiment 6
Present embodiments provide a kind of method of mud of utilize ferrate to dispose of sewage sewage work that factory discharges, this method for sludge treatment comprises the following steps:
First, extract the mud of the sewage work that Sewage Plant is discharged, added in retort.Secondly, in retort, Na2Fe04 is added, the injected volume of ferro element in Na2Fe04 in the mud of sewage work is 0.3 μ g/mgSS, then in retort, hydrochloric acid is added, the pH value in retort is made to reach 3.7, stirred the mixture in retort by agitator, stir speed (S.S.) is 600r/min simultaneously.Continuously stirring 66 minutes, makes the mud of sewage work and Na2Fe04 fully react.
Through the relevant nature of the mud of the sewage work of Na2Fe04 process and the mud of sewage work as table 6 below.
Table 6
Embodiment 7
Present embodiments provide a kind of method of mud of utilize ferrate to dispose of sewage sewage work that factory discharges, this method for sludge treatment comprises the following steps:
First, extract the mud of the sewage work that Sewage Plant is discharged, added in retort.Secondly, in retort, potassium ferrate is added, in potassium ferrite, the injected volume of iron is 0.5 μ g/mgSS, then in retort, adds sodium hydroxide, makes the pH value in retort reach 11, stirred the mixture in retort by agitator, stir speed (S.S.) is 340r/min simultaneously.Continuously stirring 30 minutes, makes the mud of sewage work and potassium ferrate fully react.
Through the relevant nature of the mud of the mud of the sewage work of Na2Fe04 process and the sewage work of sewage work as table 7 below.
Table 7
Embodiment 8
Present embodiments provide a kind of method of mud of utilize ferrate to dispose of sewage sewage work that factory discharges, this method for sludge treatment comprises the following steps:
First, extract the mud of the sewage work that Sewage Plant is discharged, added in retort.Secondly, in retort, potassium ferrate is added, in potassium ferrite, the injected volume of iron is 0.6 μ g/mgSS, then in retort, potassium hydroxide is added, the pH value in retort is made to reach 9.3, by agitator, the mixture in retort is stirred simultaneously, continuously stirring 1.5 hours, makes the mud of sewage work and potassium ferrate fully react.
Through the relevant nature of the mud of the sewage work of potassium ferrate process and the mud of sewage work as table 8 below.
Table 8
Embodiment 9
Present embodiments provide a kind of method of mud of utilize ferrate to dispose of sewage sewage work that factory discharges, this method for sludge treatment comprises the following steps:
First, extract the mud of the sewage work that Sewage Plant is discharged, added in retort.Secondly, in retort, Na2Fe04 is added, in potassium ferrite, the injected volume of sodium is 500 μ g/mgSS, then in retort, potassium hydroxide is added, the pH value in retort is made to reach 13, by agitator, the mixture in retort is stirred simultaneously, continuously stirring 2 hours, makes the mud of sewage work and Na2Fe04 fully react.
Through the relevant nature of the mud of the mud of the sewage work of Na2Fe04 process and the sewage work of sewage work as table 9 below.
Table 9
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the method utilizing the mud of ferrate to sewage work to process, is characterized in that, comprise the following steps:
A) join in retort by the mud produced by sewage work, add ferrate, the injected volume of the ferro element in described ferrate in the mud of described sewage work is 0.001 ~ 500 μ g/mgSS;
B) mud of described sewage work and described ferrate are mixed to carry out reaction 3-120 minute.
2. method according to claim 1, it is characterized in that, agitator is provided with in described retort, step B) described in Keep agitation is carried out to described agitator in the mud of sewage work and the reaction process of described ferrate, make the mud homogeneous of described ferrate and described sewage work.
3. method according to claim 1, is characterized in that, at described step B) after also comprise:
Step B) in the mud of described sewage work and after described ferrate reacts, pass into described sewage work and process, after process, discharge mud.
4. method according to claim 3, is characterized in that, at described step B) after also comprise:
By step C) in sewage work process after discharge mud carry out processed.
5. method according to claim 4, is characterized in that, described processed is specially: utilize whizzer or pressure filter to carry out processed.
6. method according to claim 1, is characterized in that, described ferrate is Na2Fe04 or potassium ferrate.
7. method according to claim 1, is characterized in that, described steps A) also comprise: in described retort, add pH adjusting agent, make the pH value in described retort reach 2 ~ 13.
8. method according to claim 7, is characterized in that, described pH adjusting agent is highly basic salt, and preferably, described highly basic salt is KOH or NaOH.
9. method according to claim 7, is characterized in that, described pH adjusting agent comprises the one in hydrochloric acid, sulfuric acid, carbonic acid gas.
10. method according to claim 1, is characterized in that, described ferrate is solid or the aqueous solution.
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Application publication date: 20160120 |