CN105692874A

CN105692874A - Method for rapidly starting half-short-cut nitrification technology

Info

Publication number: CN105692874A
Application number: CN201610040175.4A
Authority: CN
Inventors: 金仁村; 郭琼; 史志坚; 许轶群; 徐嘉丽
Original assignee: Hangzhou Normal University
Current assignee: Hangzhou Normal University
Priority date: 2016-01-21
Filing date: 2016-01-21
Publication date: 2016-06-22
Anticipated expiration: 2036-01-21
Also published as: CN105692874B

Abstract

The invention discloses a method for rapidly starting a half-short-cut nitrification technology. The method adopts an airlift bioreactor, takes sludge containing nitrifying bacteria as inoculated sludge and uses simulation wastewater as feed water; the method comprises the steps of adjusting the operation of a reactor by adding roxithromycin into the feed water in a cool and dark place at the temperature of 30-32 DEG C under the conditions that the dissolved oxygen concentration is 0.3-0.5mg.L<-1>, the pH value is equal to 7.0-7.9 and the hydraulic retention time is 40-16 hours; when the concentration of NO3<->-N in effluent of the reactor is lower than that of NH4<+>-N in 1/3 of feed water and NH4<+>-N/NO2<->-N is more than 0.75 and less than 1.3, stopping the adding of the roxithromycin, and successfully starting the half-short-cut nitrification technology. The half-short-cut nitrification technology started by the method is stable in operation, wide in source of the used reagents and simple in operation method, is capable of enabling the starting time to be shortened by 1/3-1/2, and is good in stability.

Description

A kind of method of quick startup half short-cut nitrification technology

(1) technical field

The present invention relates to a kind of wastewater denitrification process, be specifically related to a kind of half short-cut nitrification technology quick start method。

(2) background technology

In sewage, the over loading discharge of nitrogen phosphorus causes that body eutrophication is day by day serious, causes water environment degradation。For effectively containing body eutrophication, multiple biological denitrification process plays immeasurable effect。But, existing sewage treatment process--nitration denitrification belongs to energy consumption rich and influential family, under the background that energy crisis constantly highlights, reduces water and processes energy consumption, reduce handling great with the Significance of Sustainable Development for realizing sewage disposal while seeking efficient denitrification。

Meanwhile, along with the increase of the raising of China's Living consumption, water consumption, the feature such as the low COD of municipal sewage water quality, high N and low C/N ratio is more obvious, and urban organic concentration is even below 200mg L^-1。Furthermore, such as other high NH such as waste water of livestock poultry, pharmacy waste water and percolates₄ ⁺-N, low organic wastewater process in, adopt traditional biological processing method be difficult to ensure that denitrification effect, even that the demand of additional carbon is more。For solving to add carbon source problem, Process of Biological Nitrogen Removal half short distance nitration-anaerobic ammoxidation technique is arisen at the historic moment。Half short distance nitration reaction can not only by NH₄ ⁺-N is converted into NO₂ ^--N, is able to maintain that NH in water outlet simultaneously₄ ⁺-N and NO₂ ^-The amount of substance of-N is than stablizing at 1:0.8～1:1.32 to meet follow-up Anammox reaction condition。Half short distance nitration is as the prerequisite of this group technology successful operation, and it successfully starts up particularly important。When the startup of first half short distance nitration realizes mainly through controlling operating condition, as controlled aeration rate, maintain suitable temperature, step up the methods such as substrate concentration, and intermittent aerating。But these conventional methods start consuming time longer, fail to solve the key problem that half short distance nitration quickly starts。Therefore, how quickly to start half stable short-cut nitrification technology and become the key of breakthrough problem。

(3) summary of the invention

The present invention seeks to start difficult problem for half short distance nitration, it is provided that a kind of method of quick startup half short-cut nitrification technology, namely adopt the method adding Roxithromycin in bioreactor, it is possible to reach quickly to start the purpose of half short distance nitration。

The technical solution used in the present invention is:

The present invention provides a kind of method of quick startup half short-cut nitrification technology, described method is: adopt airlift bioreactor, with the mud containing nitrobacteria for seed sludge, with simulated wastewater for water inlet, at lucifuge, 30～32 DEG C, dissolved oxygen concentration 0.3～0.5mg L^-1, pH7.0～7.9, when hydraulic detention time is 40～16h, regulate the operation of reactor by adding Roxithromycin in water inlet, as NO in reactor water outlet₃ ^--N concentration is lower than 1/3 water inlet NH₄ ⁺-N concentration, 0.75 < NH in water outlet simultaneously₄ ⁺-N/NO₂ ^-< when 1.3, terminating adding of Roxithromycin, half short-cut nitrification technology successfully starts up-N；Described Roxithromycin dosage is 50-100mg L^-1。

Further, described simulated wastewater consists of: NH₄ ⁺-N200～900mg L^-1, KH₂PO₄0.27g·L^-1, MgSO₄·7H₂O0.30g·L^-1, CaCl₂0.14g·L^-1, solvent is water。

Further, described Roxithromycin dosage is 80-100mg L^-1, more preferably Roxithromycin dosage is 100mg L^-1(referring to the Roxithromycin containing 100mg/L in water, in adding period water inlet, have the Roxithromycin of such concentration all the time)。

The method of quick startup half short-cut nitrification technology of the present invention recommends to carry out as follows: adopting airlift bioreactor, with the mud containing nitrobacteria for seed sludge, seed sludge concentration MLSS is 3500mg L^-1, with simulated wastewater for water inlet, at lucifuge, 30～32 DEG C, dissolved oxygen concentration 0.3～0.5mg L^-1, pH7.0～7.9, run when hydraulic detention time is 39h, at 0～21 day, water outlet NH₄ ⁺-N concentration is at 59.9-39.0mg L^-1Between, NO₂ ^--N concentration is at 10.9～22.6mg L^-1Between, NO₃ ^--N concentration maintains 220～203mg L^-1；Continued to add 100mg L from the 22nd day^-1Roxithromycin, NH in water outlet₄ ⁺-N concentration is from 42.0mg L^-1It is gradually increased to 115mg L^-1, NO simultaneously₂ ^--N concentration is from 21.5mg L^-1Increase to 122mg L^-1, and NO₃ ^--N concentration is reduced to 98.0mg L^-1, lower than water inlet NH₄ ⁺The 1/3 of-N concentration, now water outlet NH₄ ⁺-N/NO₂ ^--N is 0.90, within the 37th day, stops adding Roxithromycin, in 20 days that stopping continues to run with after adding Roxithromycin, and NH₄ ⁺-N/NO₂ ^--N maintains between 0.83～1.12 all the time, meanwhile, and NO₃ ^--N concentration maintains 102mg L^-1Hereinafter, half short-cut nitrification technology successfully starts up；Described simulated wastewater consists of: NH₄ ⁺-N350mg·L^-1, KH₂PO₄0.27g·L^-1, MgSO₄·7H₂O0.30g·L^-1, CaCl₂0.14g·L^-1, solvent is water。

Compared with prior art, the present invention has the advantages that: the present invention is by adding antibiotic Roxithromycin widely of originating to half short distance nitration reactor, based on the Roxithromycin inhibition difference to AOB and NOB, it is possible to quickly start half short-cut nitrification technology。It has been experienced that half short-cut nitrification technology started by the method has operation stability concurrently；The inventive method agents useful for same source is wide, and operational approach is simple, it is possible to make the startup time shorten 1/3-1/2, good stability。

(4) accompanying drawing explanation

Fig. 1 is reactor start-up stage running effect curve figure。

(5) detailed description of the invention

Below in conjunction with specific embodiment, the present invention is described further, but protection scope of the present invention is not limited to that:

Embodiment 1: the step quickly starting half short distance nitration mainly includes following aspect:

1) will be enriched in the seed sludge of nitrobacteria to import in the airlift bioreactor that effective volume is 3.8L, seed sludge is municipal sewage plant's second pond returned sludge；Seed sludge concentration MLSS is 3500mg L^-1；

2) bioreactor is placed in thermostatic chamber, and reaction condition is set to: lucifuge, thermostatic chamber temperature 32 DEG C, and in reactor, dissolved oxygen concentration is 0.4～0.5mg L^-1, NaHCO₃Regulating pH is 7.5～7.9, and the simulated wastewater of tap water preparation is water inlet, wherein NH₄ ⁺-N concentration 350mg L^-1, HRT is 39h；Other constituent contents: 0.27g L^-1KH₂PO₄, 0.30g L^-1MgSO₄·7H₂O, 0.14g L^-1CaCl₂；

3) Fig. 1 is the airlift bioreactor operational effect when adding Roxithromycin and quickly starting, it will be seen from figure 1 that when not adding Roxithromycin (0～20d), NO in reactor water outlet₃ ^--N concentration maintains 200mg L always^-1Above, NO₂ ^--N concentration is lower than 25mg L^-1, the NH of water inlet is described₄ ⁺-N is largely converted into NO₃ ^--N, without NO₂ ^-The accumulation of-N。In water inlet, finite concentration (100mg L is added at the 22nd day^-1) Roxithromycin, wherein Roxithromycin is commercial standard, subsequently NO in water outlet₃ ^--N concentration continuous decrease, simultaneously NH₄ ⁺-N and NO₂ ^--N concentration raises steadily, and this is mainly inhibited the AOB of most NOB and a part to cause by Roxithromycin。At the 37th day, cancelling adding of Roxithromycin, reactor is still continual and steady to be run。Concrete, at 0～21 day, water outlet NH₄ ⁺-N concentration is at 59.9-39.0mg L^-1Between, NO₂ ^--N concentration is at 10.9～22.6mg L^-1Between, NO₃ ^--N concentration maintains 220～203mg L^-1；Continued to add 100mg L from the 22nd day^-1Roxithromycin (refers to the Roxithromycin containing 100mg/L in water, also have the Roxithromycin of such concentration in adding period water inlet all the time), NH in water outlet₄ ⁺-N concentration is from 42.0mg L^-1It is gradually increased to 115mg L^-1, NO simultaneously₂ ^--N concentration is from 21.5mg L^-1Increase to 122mg L^-1, and NO₃ ^--N concentration is reduced to 98.0mg L^-1, lower than water inlet NH₄ ⁺The 1/3 of-N concentration, now water outlet NH₄ ⁺-N/NO₂ ^--N is 0.90, namely meets water outlet NH₄ ⁺-N/NO₂ ^--N is between 0.75～1.3, and stopping in the 37th day adds Roxithromycin。And in 20 days that stopping continues to run with after adding Roxithromycin, NH₄ ⁺-N/NO₂ ^--N maintains between 0.83～1.12 all the time, meanwhile, and NO₃ ^--N concentration maintains 102mg L^-1Below, it was shown that can run continually and steadily after the adding of System undoes Roxithromycin。

Claims

1. the method for quick startup half short-cut nitrification technology, it is characterized in that described method is: adopt airlift bioreactor, with the mud containing nitrobacteria for seed sludge, with simulated wastewater for water inlet, at lucifuge, 30～32 DEG C, dissolved oxygen concentration 0.3～0.5mg L^-1, pH7.0～7.9, when hydraulic detention time is 40～16h, regulate the operation of reactor by adding Roxithromycin in water inlet, as NO in reactor water outlet₃ ^--N concentration is lower than 1/3 water inlet NH₄ ⁺-N concentration, 0.75 < NH in water outlet simultaneously₄ ⁺-N/NO₂ ^-< when 1.3, terminating adding of Roxithromycin, half short-cut nitrification technology successfully starts up-N；Described Roxithromycin dosage is 50-100mg L^-1。

2. the method quickly starting half short-cut nitrification technology as claimed in claim 1, it is characterised in that described simulated wastewater consists of: NH₄ ⁺-N200～900mg L^-1, KH₂PO₄0.27g·L^-1, MgSO₄·7H₂O0.30g·L^-1, CaCl₂0.14g·L^-1, solvent is water。

3. the method quickly starting half short-cut nitrification technology as claimed in claim 1, it is characterised in that described Roxithromycin dosage is 80-100mg L^-1。

4. the method quickly starting half short-cut nitrification technology as claimed in claim 1, it is characterised in that described Roxithromycin dosage is 100mg L^-1。

5. the method quickly starting half short-cut nitrification technology as claimed in claim 1, it is characterised in that described method is: adopting airlift bioreactor, with the mud containing nitrobacteria for seed sludge, seed sludge concentration MLSS is 3500mg L^-1, with simulated wastewater for water inlet, at lucifuge, 30～32 DEG C, dissolved oxygen concentration 0.3～0.5mg L^-1, pH7.0～7.9, run when hydraulic detention time is 39h, at 0～21 day, water outlet NH₄ ⁺-N concentration is at 59.9-39.0mg L^-1Between, NO₂ ^--N concentration is at 10.9～22.6mg L^-1Between, NO₃ ^--N concentration maintains 220～203mg L^-1；Continued to add 100mg L from the 22nd day^-1Roxithromycin, NH in water outlet₄ ⁺-N concentration is from 42.0mg L^-1It is gradually increased to 115mg L^-1, NO simultaneously₂ ^--N concentration is from 21.5mg L^-1Increase to 122mg L^-1, and NO₃ ^--N concentration is reduced to 98.0mg L^-1, lower than water inlet NH₄ ⁺The 1/3 of-N concentration, now water outlet NH₄ ⁺-N/NO₂ ^--N is 0.90, within the 37th day, stops adding Roxithromycin, in 20 days that stopping continues to run with after adding Roxithromycin, and NH₄ ⁺-N/NO₂ ^--N maintains between 0.83～1.12 all the time, meanwhile, and NO₃ ^--N concentration maintains 102mg L^-1Hereinafter, half short-cut nitrification technology successfully starts up；Described simulated wastewater consists of: NH₄ ⁺-N350mg·L^-1, KH₂PO₄0.27g·L^-1, MgSO₄·7H₂O0.30g·L^-1, CaCl₂0.14g·L^-1, solvent is water。