CN105060486A - Novel technology for treating low-carbon-nitrogen-ratio domestic sewage - Google Patents
Novel technology for treating low-carbon-nitrogen-ratio domestic sewage Download PDFInfo
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Abstract
The invention relates to environmental protection technologies, in particular to a novel technology for low-carbon-nitrogen-ratio domestic sewage. When an existing technology is used for treating low-carbon-nitrogen-ratio domestic sewage, competition of a carbon source is generated due to anaerobic phosphorus release and denitrification nitrogen removal; the metabolism period of nitrifying bacteria is long, and the metabolism period of heterotrophic bacteria and polyphosphate accumulating bacteria is short; oxygen competition is generated due to nitrifying bacteria and the heterotrophic bacteria, and the nitrifying bacteria can not be a dominant population unless organic matter is degraded thoroughly; in addition, the number of structures is large, energy consumption is high, the cost is high, and operation is troublesome. In order to solve the existing problems, the novel technology includes the steps that the domestic sewage enters an anaerobic tank, mud and water mixed liquid in the anaerobic tank enters a settling tank, supernate of the settling tank flows automatically to an aerobic biofilm nitrifying tank, meanwhile, aeration is performed to provide dissolved oxygen (DO), settled sewage sludge overreaches to an oxygen deficit tank, mud and water mixed liquid of the oxygen deficit tank enters the settling tank, the supernate of the settling tank is discharged, the settled sewage sludge flows back to the anaerobic tank, and sewage discharging meets first-class A discharge standards of national discharge standards of pollutants in town sewage factories (GB18918-2002). The novel technology has the advantages that the sewage treatment effect is good; it is unnecessary to additionally arrange a carbon source; energy consumption is low, and the treatment cost for the sewage is low; the building cost of the technology is low, and the operation method is simple; the environment is protected, and water environment quality is easily improved.
Description
Technical field
The present invention relates to environmental protection technology, specifically a kind of low ratio of carbon to ammonium sanitary sewage disposal novel process.
Background technology
Along with the fast development of economy, the phenomenon of body eutrophication is also more serious, as Chaohu, Taihu Lake and Dian Chi.Nitrogen, phosphoric are two important factors causing body eutrophication, and there are strict restriction in many countries to its emission concentration.National environmental protection portion of China requires urban wastewater treatment firm water outlet to enter major river valley and lake, reservoir etc. are closed, semiclosed waters time, must the one-level A standard of strict implement " urban wastewater treatment firm pollutant emission standard " (GB18918-2002).
In order to the qualified discharge of sanitary sewage disposal nitrogen and phosphorus, the paces of urban wastewater treatment firm construction or upgrading are accelerated in various places, and most widely used is anaerobic/anoxic/aerobic (Anaerobic-Anoxic-Oxic, A
2o) technique.The major advantage of this technique is: (1) can transform and form on the basis of conventional activated sludge method, transforms simple and easy to do; (2) capacity of resisting impact load is stronger; (3) when carbon abundance, effluent quality is better.But, for a long time, town domestic sewage C/N is lower in China, has the sewage work up to more than 65% to there is the phenomenon of carbon source deficiency, the water inlet C/N of the sewage work of nearly 43% is less than 3, and in sewage, carbon source can not meet the needs of Microbial denitrogenation dephosphorization.Therefore, A is adopted
2during O art breading sanitary sewage, this outstanding problem of usual existence: denitrification denitrogenation and dephosphorization microorganism are to the competition of carbon source, because the carbon source of municipal effluent is generally on the low side, be difficult to the demand meeting denitrogenation dephosphorizing, the sewage nitrogen therefore after process and phosphorus are difficult to reach emission standard.In addition, also there is following shortcoming in this work: different sludge age (SolidsRetentionTime, SRT) microorganism coexists the disadvantageous effect to nitrogen and phosphorus ligands, the generation time of polyP bacteria is shorter, can normal growth under the condition that SRT is shorter, and higher dephosphorization efficiency by using can be obtained, and nitrobacteria belongs to autotrophic type obligate aerobic bacterium, its speed of growth is slow, generation time is longer, preferably nitric efficiency can be obtained under the condition that SRT is longer, therefore, the nitrobacteria denitrogenation dephosphorizing inefficiency that also cause sanitary sewage different from the SRT of polyP bacteria.
For ensureing nitrogen, phosphorus qualified discharge, usually adopting the measures such as additional carbon to improve Nitrogen/Phosphorus Removal, adding the consumption of cost of sewage disposal and the energy.Therefore, exploitation adapt to the denitrification dephosphorization technique of low C/N than the less energy-consumption of wastewater efficient rate to promoting the development of sewage disposal cause, improve quality of water environment and be significant.
This seminar is in early-stage Study, sanitary sewage disposal is compared for low C/N, have developed a kind of new technique (Zou Haiming, Lv Xiwu, Li Ting. denitrification dephosphorization-induced crystallization phosphorus recovery process test [J]. Central China University of Science and Technology's journal (natural science edition), 2014,42 (4): 127-132.)
The feature of this technique is that (namely DPAO and nitrobacteria are in two independently sludge systems to the two sludge form of employing, play the features of denitrification nitrogen and phosphorus removal and nitration reaction fully), under anaerobic environment, DPAO at the simultaneously stability phosphorus of denitrification denitrogenation, can improve the utilising efficiency of carbon source.This technique can alleviate three conspicuous contradictions of traditional denitrification dephosphorization technique: (1) carbon source is not enough: anaerobic phosphorus release and denitrification denitrogenation are to the competition of carbon source; (2) mud contradiction in age: the nitrifier metabolism cycle is long, and heterotrophic bacterium and the polyP bacteria metabolism cycle short; (3) nitrifier and heterotrophic bacteria are to the competition of oxygen, only have the nitrifier when organic matter degradation is complete just can become dominant population.Although the low C/N of this art breading is than achieving good effect during sanitary sewage, but this technique needs structures many (anaerobic pond 1,1, aerobic nitrification pond, anoxic pond 1,1, rearmounted aeration tank, settling tank 3), run power consumption large, be difficult to be applied to veritably among actual sewage process.
Less energy-consumption, the low C/N of high-level efficiency process can remain an insoluble technical problem than sanitary sewage up to now.
Therefore the low C/N of a kind of process of invention is than sanitary sewage, the novel process that efficiency is high, energy consumption is low for environment protection (particularly the prevention and control of body eutrophication), to reduce cost of water treatment be the very important task of field of water treatment.
Summary of the invention
The object of this invention is to provide a kind of low ratio of carbon to ammonium sanitary sewage disposal novel process, the novel process that efficiency is high, energy consumption is low.
The object of the present invention is achieved like this:
(1) sanitary sewage enters anaerobic pond;
(2) anaerobic pond muddy water mixed solution enters settling tank;
(3) gravity flow of settling tank supernatant liquor is to aerobic biologic membrane nitrification tank, and carry out aeration provides dissolved oxygen (DissolvedOxygen, DO) simultaneously, and precipitating sludge surmounts to anoxic pond;
(4) anoxic pond muddy water mixed solution enters settling tank;
(5) settling tank supernatant liquor discharge, precipitating sludge is back to anaerobic pond.
The described DO concentration of step (3), is greater than 2mg/L.
Main points of the present invention are:
Adopt active sludge and microbial film combination form, by nitrobacteria and dephosphorization microorganism independent, give full play to respective feature; Utilize aerobic biologic membrane nitrification tank to replace activated sludge process, eliminate a settling tank and a set of sludge recirculation system, saved laid down cost; In operational process, only need 2 sludge reflux pumps, greatly reduce energy consumption.
Compared with the prior art, its outstanding creativeness is following 4 points in the present invention:
(1) adopt denitrification synchronous denitrification dephosphorizing technology, successfully solve anaerobic phosphorus release and denitrification denitrogenation to the competition contradiction of carbon source, DPAO is that electron acceptor(EA) realizes denitrification synchronous denitrification dephosphorizing under anoxic conditions with nitrate;
(2) adopt active sludge and microbial film combination form, by nitrobacteria and dephosphorization microorganism independent, give full play to respective feature, successfully solve the contradiction of nitrobacteria and polyP bacteria SRT;
(3) utilize aerobic biologic membrane nitrification tank to replace activated sludge process, eliminate a settling tank and a set of sludge recirculation system, saved laid down cost;
(4) whole technique, only needs 2 sludge reflux pumps, greatly reduces energy consumption in operational process, easy and simple to handle in addition.
Specific embodiment of the invention measure is:
(1) sanitary sewage enters anaerobic pond;
(2) anaerobic pond muddy water mixed solution enters settling tank;
(3) gravity flow of settling tank supernatant liquor is to aerobic biologic membrane nitrification tank, and carry out aeration provides dissolved oxygen (DissolvedOxygen, DO) simultaneously, and keep DO concentration to be greater than 2mg/L, precipitating sludge surmounts to anoxic pond, and mud surmounts than 40%;
(4) anoxic pond muddy water mixed solution enters settling tank;
(5) settling tank supernatant liquor discharge, precipitating sludge is back to anaerobic pond.
The present invention is applicable to the low ratio of carbon to ammonium waste water such as town domestic sewage, with a wide range of applications.
The present invention compared with domestic and international existing similar technique, its creativeness be following some:
(1) adopt denitrification synchronous denitrification dephosphorizing technology, successfully solve anaerobic phosphorus release and denitrification denitrogenation to the competition contradiction of carbon source;
(2) adopt the form of active sludge and microbial film combination, successfully solve the contradiction of nitrobacteria and polyP bacteria SRT;
(3) utilize aerobic biologic membrane nitrification tank to replace activated sludge process, eliminate a settling tank and a set of sludge recirculation system, saved laid down cost;
(4) whole technique, only needs 2 sludge reflux pumps, greatly reduces energy consumption in operational process, easy and simple to handle in addition.
Advantage of the present invention is:
1, good sewage processing effect.
2, additional carbon is not needed.
3, energy expenditure is low, and cost of water treatment is low.
4, technique laid down cost is low, working method.
5, protection of the environment, is beneficial to quality of water environment and improves.
Accompanying drawing explanation
Fig. 1 is low ratio of carbon to ammonium sanitary sewage disposal operational process schematic diagram of the present invention.
Embodiment
Below by embodiment, the present invention will be further described.
Example 1
The simulated domestic wastewater (composition is in table 1) of laboratory configuration is adopted to use this novel process to process.
Inlet COD concentration 200mg/L, water outlet 16mg/L; Water inlet TN concentration 45mg/L, water outlet 7mg/L; Water inlet NH
4 +-N concentration 41mg/L, water outlet 4.3mg/L; Phosphorus influent concentration 8mg/L, water outlet 0.35mg/L, meet country's " town sewage plant pollutant emission standard " (GB18918-2002) one-level emission standard A.
Example 2
Actual domestic wastewater (index of correlation value is in table 2) is adopted to use this novel process to process.
COD, TP, NH in water outlet
4 +the mean concns of-N and TN is respectively 35mg/L, 0.4mg/L, 3.8mg/L, 8.5mg/L, meets country's " town sewage plant pollutant emission standard " (GB18918-2002) one-level emission standard A.
As can be seen from above-mentioned example, no matter be simulated domestic wastewater or actual domestic wastewater, the present invention, for sanitary sewage disposal, especially to the process of low C/N than sanitary sewage, has good treatment effect.
Above-described embodiment is only preference of the present invention, is not used for limiting the present invention, all within principle of the present invention, and any equivalent alternative, the modifications and variations done, all within protection scope of the present invention.
Claims (2)
1. a low ratio of carbon to ammonium sanitary sewage disposal novel process, step is as follows:
(1) sanitary sewage enters anaerobic pond;
(2) anaerobic pond muddy water mixed solution enters settling tank;
(3) gravity flow of settling tank supernatant liquor is to aerobic biologic membrane nitrification tank, and carry out aeration provides dissolved oxygen (DissolvedOxygen, DO) simultaneously, and precipitating sludge surmounts to anoxic pond;
(4) anoxic pond muddy water mixed solution enters settling tank;
(5) settling tank supernatant liquor discharge, precipitating sludge is back to anaerobic pond.
2. according to claim (1) described sewage treatment technique, it is characterized in that: the described DO concentration of step (3), is greater than 2mg/L.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108862586A (en) * | 2018-07-09 | 2018-11-23 | 北京恩菲环保股份有限公司 | Sewage water treatment method |
| CN110015756A (en) * | 2019-04-11 | 2019-07-16 | 华北水利水电大学 | A kind of denitrification dephosphorization coupled vibrations anoxic MBR device and technique |
| CN112978914A (en) * | 2019-12-16 | 2021-06-18 | 江苏孚璋生物技术有限公司 | Method for controlling sludge age of double sludge of continuous flow automatic domestic sewage treatment equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102381818A (en) * | 2011-10-24 | 2012-03-21 | 沈阳建筑大学 | A2N-SBR (Anaerobic-anoxic/nitrification-sequencing batch reactor) process with shortcut nitrification-denitrification denitrifying and dephosphorizing function |
| CN103539322A (en) * | 2013-11-06 | 2014-01-29 | 北京市市政工程设计研究总院 | Method for removing nitrogen and phosphorus from sewage and special equipment for implementing method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102381818A (en) * | 2011-10-24 | 2012-03-21 | 沈阳建筑大学 | A2N-SBR (Anaerobic-anoxic/nitrification-sequencing batch reactor) process with shortcut nitrification-denitrification denitrifying and dephosphorizing function |
| CN103539322A (en) * | 2013-11-06 | 2014-01-29 | 北京市市政工程设计研究总院 | Method for removing nitrogen and phosphorus from sewage and special equipment for implementing method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108862586A (en) * | 2018-07-09 | 2018-11-23 | 北京恩菲环保股份有限公司 | Sewage water treatment method |
| CN110015756A (en) * | 2019-04-11 | 2019-07-16 | 华北水利水电大学 | A kind of denitrification dephosphorization coupled vibrations anoxic MBR device and technique |
| CN112978914A (en) * | 2019-12-16 | 2021-06-18 | 江苏孚璋生物技术有限公司 | Method for controlling sludge age of double sludge of continuous flow automatic domestic sewage treatment equipment |
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