CN1128109C

CN1128109C - Biological sewage denitrifying method

Info

Publication number: CN1128109C
Application number: CN00132076A
Authority: CN
Inventors: 李开春
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-12-14
Filing date: 2000-12-14
Publication date: 2003-11-19
Anticipated expiration: 2020-12-14
Also published as: CN1297852A

Abstract

The present invention relates to a biological sewage denitrifying method. Under the participation of microorganisms in activated sludge, the method is completed by biochemical nitrification reaction or reaction of nitrous acid or denitrification reaction. The present invention comprises the processes that pH 6-12 sewerage containing nitrogen enters the same reaction space for processing for 6 to 18 hours, wherein the reaction space contains activated sludge, and the inside is provided with a porous material body.

Description

Biological sewage denitrifying method

What the present invention relates to is a kind of denitrifying method that nitrogenous compound in the sewage is carried out in the biological chemistry mode by the microorganism in the active sludge.

The active sludge denitrogenation is to be present in the biochemical action that microorganisms such as nitrifier in the active sludge and denitrifier carry out in its existence and breeding, the various nitrogenous compounds of dissolved in the sewage (can be expressed as NH ₃-N form) is converted into inactive gaseous nitrogen and banish method in atmosphere.Its reaction and treating processes can be divided into the nitration reaction process that comprises nitrification and/or nitrite acidizing basically, and denitrification reaction that carries out subsequently or two steps that can be described as anti-nitration reaction again.Because nitrifying process is the aerobic reaction of carrying out under Nitromonas or Nitrosomas participation, also H will be arranged in reaction process ⁺Produce; Denitrification process then is the anaerobic reaction that carries out under denitrifier participates in, and in reaction process OH will be arranged ^-Produce.Therefore, that uses till today handles traditional way with denitrification activity mud method to nitric wastewater always, all is to make above-mentionedly on reaction property and the condition nitration reaction treating processes that greatly differs from each other and anti-nitration reaction treating processes are being carried out in two reaction compartments of separating mutually such as independent reaction container respectively and finishing.This processing mode is exactly that the utilization ratio of reactive system is difficult to improve for the required floor space of its processing is big with direct problem at first.

Given this, the objective of the invention is provides a kind of brand-new microorganism that passes through to exist in the active sludge to remove the method for various nitrogenous compounds in the sewage in the biological chemistry mode for addressing the above problem, the utilization ratio of conventional sewage water denitrification treatment facility is increased substantially, and make to handling required floor space and can reduce at double.

Biological sewage denitrifying method of the present invention and principle thereof are under the microorganism that exists in active sludge participates in equally, the nitrification of carrying out through himself existence and breeding or nitrite acidizing reacts and two Biochemical processes of denitrification reaction are finished.The said procedure of the present invention is the nitric wastewater of pH6-12 to be entered contain active sludge and be provided with therein in the same reaction compartment of porous material body to handle 6-18 hour.

In above-mentioned treatment process of the present invention, because the active sludge that exists the required various microorganisms of promising denitrogenation to depend on for existence and breed in the reaction compartments such as reaction treatment container of routine, this is prerequisite and the prerequisite of sewage being handled with denitrification activity mud method.After in having the same reaction compartment of this active sludge, being provided with suitable porous material body again simultaneously, the porous proterties that self is had by its material bodies determines, reaction solution in being present between the inner porous air of this material bodies, and be surrounded between the outer liquid of this material bodies and carry out various exchange of substance, particularly speed and the exchange capacity that the gas that is dissolved in the liquid is exchanged all hindered, and is the form by graded and distribution from inside to outside.Thereby through suitable starting time, in this porous material body, can form and keep relatively stablely another many-side such as temperature, pH all be surrounded on its outside liquid phase environment and have significantly different local environment, particularly can also externally contain and form and keep an anaerobic environment that can help anerobe existence and breed in the competent liquid phase environment of oxygen.And for being surrounded on the external liquid phase of this porous material, conditional parameters such as its oxygen level, temperature and pH can artificially be adjusted and be changed again as required easily.Obviously, in same reaction system and reaction compartment, form and concentrate and stably have simultaneously two mutually different reaction environments in that different zones is relative, particularly behind the visibly different environment of oxygen level, aerobic nitrifier and anaerobic denitrifier can be survived respectively in the different zones of this same reaction compartment with living together peacefully and breed, and this is to make the sufficient condition that can carry out and finish the processing of sewage with the active sludge denitrogenation.Therefore, aforesaid method of the present invention can make the traditional way that must carry out nitration reaction and anti-nitration reaction in the independent reaction space of separating mutually respectively, changes into and can carry out in reaction compartments such as same reaction vessel and finish.Inevitable and the direct result that it brought obviously is: under the prerequisite of treatment condition that do not change existing active sludge denitrogenation and operational requirement, the utilization ratio of existing conversion unit is doubled, be handle required floor space then substantially can corresponding minimizing half.On the other hand, because aforesaid method of the present invention is nitration reaction and anti-nitration reaction are carried out in the reaction compartment of forms such as same container and to finish, utilize it to exist in reaction process separately and produce the variation of potential of hydrogen waits some because of having necessarily relative complementary factor mutually on the contrary in the reaction system as making, the entire reaction environment is become within the specific limits can have certain surge capability the soda acid variation, and each self-reactingly carries out all favourable buffer system to it, make reaction conditions realize regulating automatically to a certain extent, that is, can make that the work of the operation of the nitration reaction of independently carrying out respectively by traditional way and anti-nitration reaction and regulating and controlling is relative more to be simplified and make things convenient for.For example, can produce the correlative factor of complementary action and/or be combined with suitably artificial adjusting operation by nitration reaction and the anti-nitration reaction interprocedual that in this same reactive system, carries out simultaneously, the potential of hydrogen of said reaction liquid phase in the aforesaid method of the present invention is maintained in the scope of pH6-10; The temperature maintenance that makes this reaction liquid phase is being in 10 ℃-40 ℃ the scope.With air or other appropriate form, making the oxygen level that keeps in the said treating processes in the reaction liquid phase is in the scope of 4-10 mg/litre etc. by the stirring sent in reaction solution with blast apparatus in the usual way.

Based on the above method, further making said this porous material body is the snappiness porous material body with deformability, as commonly used and do not contain forms such as soft polymeric foamed material body that CN, heavy metal or other may produce the toxic action composition to existence and the propagation of reaction microorganisms such as nitrifier and denitrifier for better.Because of it can have the advance and retreat distortion of a tailor-made relative adaptability and/or the move place that changes according to current and/or variations in flow situation in the reaction liquid phase, this for make in this porous material body, form and keep to keep relatively stable be favourable in order to carry out influence that the necessary local environment of anti-nitration reaction is subjected to the external liquid phase environmental change less as far as possible.

In above-mentioned reaction system, said porous material body can be arranged on position required and suitable in the reaction compartment according to reaction needed.General is good to be the form that is suspended in the processing reaction liquid phase.On concrete suspension form, can be one or several these porous material bodies to be suspended in the reaction compartment in reaction compartment with the relatively-stationary form in present position through syndeton; Also can two or more be set for the different positions place in reaction compartment and be used to locate or spacing structure, and one or several said these porous material bodies are suspended in the reaction compartment can make the appropriate unsteady mode of trip of moving in by these location or position limiting structure restricted portion.In addition, test-results also shows, making the said above-mentioned volume that is arranged at the porous material body in the reaction compartment generally speaking is when accounting for the 30%-60% of entire treatment reaction compartment useful volume, and nitration reaction in this same reaction system and anti-nitration reaction all can make the denitrogenation processing of nitric wastewater can be carried out and finish smoothly.

Another distinguishing feature of using aforesaid method of the present invention that nitric wastewater is handled also shows, it both can be for having handled with the batch-wise intermittent type in this reaction vessel to the processing of nitric wastewater, processed sewage risen to the Way out that leaves reaction compartment at last by the import that enters this reaction compartment in the said treatment time carry out in the dynamic process of operation continuously and finish.Employing can also make the processing efficiency to sewage be further improved in continuous mode of carrying out dynamichandling in service.In addition, because the maximum characteristics of the above-mentioned treatment process of the present invention are that carry out simultaneously in same reaction compartment and finish must be by two treating processess of carrying out and finishing in two independent reaction systems that are separated from each other under traditional way, therefore, can reduce on the basis of half in the above-mentioned floor space that makes, can also make each conversion unit and/or container take to be set to possibility to the mode of traffic altitude development.Can make to the required equipment of sewage disposal and/or reaction vessel by this brand-new set-up mode and unavoidably can further greatly reduce again the appropriation of land area.

In addition, because the existence of active sludge in the reaction system, under above-mentioned favourable conditions such as reaction system with appropriate shock absorption, being present in other microorganism in the active sludge pollutes composition to other the organic class that exists in the processed sewage and equally also carries out disaggregating treatment, make it can be used as the hydrogen source of supply required on the one hand to the denitrogenation processing process, make processed sewage on the other hand when carrying out above-mentioned denitrification reaction treating processes, indexs such as the COD of processed sewage, BOD equally also can obtain comparatively ideal treatment effect.

Below by specific embodiment foregoing of the present invention is described in further detail, but this should be interpreted as that the scope of the above-mentioned theme of the present invention is confined to following example.All same technology that is realized based on the above-mentioned theme of the present invention all should belong to scope of the present invention.

In having the conventional denitrogenation processing reactor of active sludge, be provided with and have the high-molecular porous foam material material of the spongiform snappiness of deformable can be suspended in the mode of reaction in the liquid phase.The cumulative volume of reactor is 7.5 cubic metres, and the high-molecular porous foam material material of spongiform snappiness wherein is 4.0 cubic metres, and the discharge of sewage hourly is 0.5 cubic metre/hour.Through pre-treatment is the NH that contains of pH6-12 ₃The pending petrochemical wastewater of-N enters reactor with 10 ℃-25 ℃ feeding temperature, and makes it remain in 12 hours treatment time import by reactor to move to and carry out under the continuous running status of outlet and finish the denitrogenation processing reaction.In the dynamic operation treating processes of sewage, the pH value of reaction liquid phase can be automatically or through artificially adjustment a little, makes in its scope that remains on 6-10, and liquidus temperature is controlled to be 10-40 ℃.Also should in reaction solution, send into air continuously through blast apparatus in the usual way in the treating processes and stir, and make the oxygen level in the reaction liquid phase remain the 5-7 mg/litre.Correlation detection index before and after each routine sewage disposal is as shown in the table.The detection data that show in the table show, adopt above-mentioned roughly the same operation scheme that the sewage that contains dirty situation and be not quite similar is handled after, all can obtain the result of being satisfied with.

Table 1: the correlation detection index before and after each routine sewage disposal

Test item	Embodiment 1		Embodiment 2		Embodiment 3
	Embodiment 1		Embodiment 2		Embodiment 3		Before the processing	After the processing	Before the processing	After the processing	Before the processing	After the processing
	NH ₃-N (mg/L)	325	13	268	8	308	Before the processing	After the processing	Before the processing	After the processing	Before the processing	After the processing	10
COD _Cr (mg/L)	NH ₃-N (mg/L)	325	13	268	8	308	495	87	436	76	398	73	10
COD _Cr (mg/L)	BOD (mg/L)	218	25	219	23	205	495	87	436	76	398	73	21
PH	BOD (mg/L)	218	25	219	23	205	9.5	7.6	8.8	7.1	10.3	7.5	21

Claims

1. biological sewage denitrifying method, under participating in, the microorganism that exists in active sludge finishes through biochemical nitrification or nitrite acidizing reaction and denitrification reaction two processes, it is characterized in that making the nitric wastewater of pH6-12 to enter in the same reaction compartment that contains active sludge and be provided with the porous material body therein handled 6-18 hour, keeping the oxygen level in the reaction liquid phase in the treating processes is the 4-10 mg/litre, and forms and keep the anaerobic environment that helps anerobe existence and propagation at this porous material body.

2. the biological denitrificaion treatment process of sewage according to claim 1 is characterized in that said porous material body is the snappiness porous material body with deformability.

3. as the biological denitrificaion treatment process of sewage as described in the claim 2, it is characterized in that said deformability snappiness porous material body is soft polymeric foamed material body.

4. as the described biological sewage denitrifying method of one of claim 1 to 3, it is characterized in that said porous material body is the form that is suspended in the processing reaction liquid phase.

5. as the described biological sewage denitrifying method of one of claim 1 to 3, it is characterized in that the volume of said porous material body accounts for entire treatment reaction compartment volumetrical 50%-60%.

6. as the described biological sewage denitrifying method of one of claim 1 to 3, the pH that it is characterized in that said reaction liquid phase is 6-10.

7. as the described biological sewage denitrifying method of one of claim 1 to 3, the temperature that it is characterized in that said reaction liquid phase is 10 ℃-40 ℃.

8. as the described biological sewage denitrifying method of one of claim 1 to 3, it is characterized in that the oxygen level of said reaction solution realizes by send into the mode that stirs with air in reaction solution.

9. as the described biological sewage denitrifying method of one of claim 1 to 3, it is characterized in that said sewage treatment process is processed sewage is carried out in the continuous dynamic running process of the Way out that leaves reaction compartment by the import that enters reaction compartment and to finish in the said treatment time.