CN107265637B - A kind of leather-making waste water total nitrogen removal technique - Google Patents
A kind of leather-making waste water total nitrogen removal technique Download PDFInfo
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- CN107265637B CN107265637B CN201710523387.2A CN201710523387A CN107265637B CN 107265637 B CN107265637 B CN 107265637B CN 201710523387 A CN201710523387 A CN 201710523387A CN 107265637 B CN107265637 B CN 107265637B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/22—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof
- C02F2103/24—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof from tanneries
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Abstract
The present invention provides a kind of leather-making waste water total nitrogen removal techniques, belong to field of environmental technology.A kind of total nitrogen removal technique, comprising the following steps: before S1, sewage enter biochemical treatment, wastewater influent Water-quality control；S2, sewage enter anaerobic zone, carry out pre-denitrification and denitrogenation；S3, sewage enter aerobic zone I from anaerobic zone, synchronize nitrification and denitrification reaction；S4, make sewage backflow in aerobic zone I to anaerobic zone by reflux pump；S5, sewage enter aerobic zone I from anaerobic zone, and add carbon source to aerobic zone I；S6, sewage enter settling zone I from aerobic zone I, and precipitation surface load is 1.0；S7, sewage enter aerobic zone II from settling zone I, supplement basicity, depth nitration reaction, and abundant mineralized nitrogen is nitrate nitrogen；S8, sewage enter settling zone II, precipitation surface load 0.8 from aerobic zone II.The present invention has with lower cost, efficient to realize the advantages of carrying out advanced treating to leather-making waste water total nitrogen.
Description
Technical field
The invention belongs to field of environment engineering, are related to a kind of leather-making waste water total nitrogen removal technique.
Background technique
Leather industry is the pillar industry of China's light industry, now has become the industry with international competitiveness, China
Have become the center of world's leather industry, enjoys three big good reputations in the world: first is that stock number is big；Second is that yield is big；Third is that
Foreign trade amount is big.Leather industry is the preponderant dinstinctive industry in Zhejiang Province, even more the pillar industry of Haining City and have competition
The specialty industries of advantage, leather have visually been described as " the golden business card " in Haining.But it should also be recognized that leather industry belongs to tradition
Industry can generate certain pollutant in process of production.Wherein, the total nitrogen pollutant generated in tanning production is leather industry
In very big pollution, and one of the main problem of puzzlement leather industry development.
So far, having leather-making waste water total nitrogen removal technology mainly has following three categories: chemical denitrification treatment technology: changing
Total nitrogen usually within the scope of suitable pH, is oxidized to nitrogen or nitrogen oxide by method, thus reach removal effect, but this
The removal expense of kind method is excessively high, uneconomical as conventional treatment；Physical chemistry denitrification treatment technology: mainly by physics and
The process that total nitrogen is separated or decomposed from waste water by chemical method, but its construction and operating cost are relatively high, and total nitrogen is not real
Removal, and be transferred into solid waste sludge, it is also easy to produce secondary pollution；Bio-denitrification technology: bioanalysis denitrogenation is to utilize nature
The circulation theory of nitrogen, is controlled by manual method, by ammonification, nitrification, denitrification, is by the nitrogen transformation in water
Nitrogen, thus overflow discharge into water to atmosphere process.
Relative to other two kinds of technologies, consider from composite factors such as economic and technicals, total nitrogen concentration larger for water compared with
High leather-making waste water, bioanalysis denitrification treatment technology are primary selections, are most economical effective processing techniques, technology at
It is ripe, stable, processing cost is lower.
Summary of the invention
The purpose of the present invention is there is the above problem in view of the prior art, a kind of leather-making waste water total nitrogen removal work is proposed
Skill, this leather-making waste water total nitrogen, which removes technique, to be had and can efficiently be realized with lower cost and be carried out advanced treating to total nitrogen
Feature.
Object of the invention can be realized by the following technical scheme:
A kind of leather-making waste water total nitrogen removal technique, which comprises the following steps:
Before S1, sewage enter biochemical treatment, wastewater influent Water-quality control range COD1500-2500mg/L, total nitrogen 150-
300mg/L；
S2, sewage enter anaerobic zone, hydraulic detention time 1 day, carry out pre-denitrification and denitrogenation, in the environment of anaerobism,
Anti-nitration reaction is carried out using the degradable COD in leather waste water, achievees the purpose that nitrate nitrogen is converted into nitrogen；
S3, sewage enter aerobic zone I from anaerobic zone, hydraulic detention time 2 days, synchronize nitrification and denitrification reaction,
And the basicity that anaerobic zone generates can supplement the basicity in aerobic zone I；
S4, the sewage in aerobic zone I is made to flow back into anaerobic zone with reflux ratio 100% by reflux pump, and in aerobic zone I
Nitrate nitrogen carries out denitrogenation with sewage backflow to anaerobic zone；
S5, sewage enter aerobic zone I from anaerobic zone, and add carbon source to aerobic zone I；
S6, sewage enter settling zone I from aerobic zone I, and precipitation surface load is 1.0, and the sludge in settling zone I largely returns
It flow to anaerobic zone, some residual activated sludge outlet；
S7, sewage enter aerobic zone II from settling zone I, hydraulic detention time 1 day, under low strength COD environment, supplement one
Determine basicity, basicity maintains 200-300mg/L, depth nitration reaction, and abundant mineralized nitrogen is nitrate nitrogen；
S8, sewage enter settling zone II, precipitation surface load 0.8 from aerobic zone II, and the sludge reflux in settling zone II arrives
Aerobic zone II, excess activated sludge discharged to arrive aerobic zone I, waste water a part of settling zone II is discharged, and a part is with reflux ratio
100% is back to anaerobic zone.
The Prepositive denitrification of anaerobic zone, using organic matter as substrate, what is utilized is the carbon source in waste water, then is not necessarily to external carbon
Source, with lower capital construction and operating cost, efficient denitrification reduces COD, controls sludge bulking, and nitric efficiency is high；Prepositive denitrification
Sewage after reaction enters aerobic zone I and synchronizes nitrification and denitrification, and the basicity that anaerobic zone generates can be mentioned to aerobic zone I
For reducing cost, and the nitrification liquid of aerobic zone I can flow back into anaerobic zone and carry out denitrogenation.Due to the organic matter quilt in aerobic zone I
Heterotroph consumption, then need additional carbon, and sewage that can be high to total nitrogen content realizes removal；The setting of aerobic zone II can be protected
Hinder the further removal of ammonia nitrogen and COD, meanwhile, nitrification liquid is provided for anaerobic zone.
In above-mentioned leather-making waste water total nitrogen removal technique, the carbon source is methanol.
In above-mentioned leather-making waste water total nitrogen removal technique, the dissolved oxygen in the anaerobic zone is less than 0.1mg/L.
In above-mentioned leather-making waste water total nitrogen removal technique, the dissolved oxygen in the aerobic zone I is 1-2mg/L.
In above-mentioned leather-making waste water total nitrogen removal technique, the MLSS concentration in the anaerobic zone is 8-10g/L.
In above-mentioned total nitrogen removal technique, the MLSS concentration of the aerobic zone I is 8-10g/L.
In above-mentioned leather-making waste water total nitrogen removal technique, the dissolved oxygen of the aerobic zone II is 2-4mg/L.
In above-mentioned leather-making waste water total nitrogen removal technique, the MLSS concentration of the aerobic zone II is 3-5g/L.
In above-mentioned leather-making waste water total nitrogen removal technique, the volumetric ratio of the anaerobic zone, aerobic zone I and aerobic zone II is
1:2:1。
Compared with prior art, this leather-making waste water total nitrogen removal technique has the advantage that
1, the present invention synchronizes nitrification and denitrification in aerobic zone I and in aerobic zone in the Prepositive denitrification of anaerobic zone
II depth nitrification can more effectively reach draining total nitrogen≤40mg/L, be lower than " process hides and fur manufacturing industrial water pollution
Object discharge standard " (GB30486-2013) table two leather-making enterprises in line standard.
2, anaerobic zone is using organic matter as substrate in the present invention, using leather-making waste water high concentration and the strong carbon source of biochemical, then
Without additional carbon, denitrogenation is realized with lower capital construction and operating cost, there is certain economic benefit, the water conservancy of biochemical reaction
It is residence time 4 days, fast compared with general technology, reduce the investment of civil engineering.
3, the aerobic zone II in the present invention can ensure ammonia nitrogen and the further removal of COD.
4, using Activated Sludge Process, reduce the application of filler, the fouling of filler avoided to collapse, and reduce periodically with
The expense changed, it is more economical to be applicable in.
Detailed description of the invention
Fig. 1 is flow diagram of the invention.
Specific embodiment
Following is a specific embodiment of the present invention in conjunction with the accompanying drawings, technical scheme of the present invention will be further described,
However, the present invention is not limited to these examples.
Embodiment one
As shown in Figure 1, a kind of leather-making waste water total nitrogen removal technique, comprising the following steps:
Before S1, sewage enter biochemical treatment, wastewater influent Water-quality control range COD2000mg/L, total nitrogen 180mg/L；
S2, sewage enter anaerobic zone, hydraulic detention time 1 day, carry out pre-denitrification and denitrogenation, in the environment of anaerobism,
Anti-nitration reaction is carried out using the degradable COD in leather waste water, achievees the purpose that nitrate nitrogen is converted into nitrogen；
S3, sewage enter aerobic zone I from anaerobic zone, hydraulic detention time 2 days, synchronize nitrification and denitrification reaction,
And the basicity that anaerobic zone generates can supplement the basicity in aerobic zone I, about supplement 50%；
S4, the sewage in aerobic zone I is made to flow back into anaerobic zone with reflux ratio 100% by reflux pump, and in aerobic zone I
Nitrate nitrogen carries out denitrogenation with sewage backflow to anaerobic zone；
S5, sewage enter aerobic zone I from anaerobic zone, and add carbon source to aerobic zone I；
S6, sewage enter settling zone I from aerobic zone I, and precipitation surface load is 1.0, and the sludge in settling zone I largely returns
It flow to anaerobic zone, some residual activated sludge outlet；
S7, sewage enter aerobic zone II from settling zone I, hydraulic detention time 1 day, under low strength COD environment, supplement one
Determine basicity, basicity maintains 200mg/L, depth nitration reaction, and abundant mineralized nitrogen is nitrate nitrogen；
S8, sewage enter settling zone II, precipitation surface load 0.8 from aerobic zone II, and the sludge reflux in settling zone II arrives
Aerobic zone II, excess activated sludge discharged to arrive aerobic zone I, waste water a part of the settling zone II of settling zone II is discharged, a part
Anaerobic zone is back to reflux ratio 100%.
The Prepositive denitrification of anaerobic zone, using organic matter as substrate, what is utilized is the carbon source in waste water, then is not necessarily to external carbon
Source, with lower capital construction and operating cost, efficient denitrification reduces COD, controls sludge bulking, and nitric efficiency is high；Prepositive denitrification
Sewage after reaction enters aerobic zone I and synchronizes nitrification and denitrification, and the basicity that anaerobic zone generates can be mentioned to aerobic zone I
For reducing cost, and the nitrification liquid of aerobic zone I can flow back into anaerobic zone and carry out denitrogenation.Due to the organic matter quilt in aerobic zone I
Heterotroph consumption, then need additional carbon, and sewage that can be high to total nitrogen content realizes removal；The setting of aerobic zone II can be protected
Hinder the further removal of ammonia nitrogen and COD, meanwhile, nitrification liquid is provided for anaerobic zone.
Dissolved oxygen in anaerobic zone is less than 0.1mg/L, and the MLSS concentration in anaerobic zone is 9g/L；Dissolution in aerobic zone I
Oxygen is 1.5mg/L, and the MLSS concentration of aerobic zone I is 8.5g/L；The dissolved oxygen of aerobic zone II is 2mg/L, the MLSS of aerobic zone II
Concentration is 3g/L.Wherein, the volumetric ratio of anaerobic zone, aerobic zone I and aerobic zone II is 1:2:1.
Embodiment two
A kind of leather-making waste water total nitrogen removal technique, comprising the following steps:
Before S1, sewage enter biochemical treatment, wastewater influent Water-quality control range COD2300mg/L, total nitrogen 200mg/L；
S2, sewage enter anaerobic zone, hydraulic detention time 1 day, carry out pre-denitrification and denitrogenation, in the environment of anaerobism,
Anti-nitration reaction is carried out using the degradable COD in leather waste water, achievees the purpose that nitrate nitrogen is converted into nitrogen；
S3, sewage enter aerobic zone I from anaerobic zone, hydraulic detention time 2 days, synchronize nitrification and denitrification reaction,
And the basicity that anaerobic zone generates can supplement the basicity in aerobic zone I, about supplement 50%；
S4, the sewage in aerobic zone I is made to flow back into anaerobic zone with reflux ratio 100% by reflux pump, and in aerobic zone I
Nitrate nitrogen carries out denitrogenation with sewage backflow to anaerobic zone；
S5, sewage enter aerobic zone I from anaerobic zone, and add carbon source to aerobic zone I；
S6, sewage enter settling zone I from aerobic zone I, and precipitation surface load is 1.0, and the sludge in settling zone I largely returns
It flow to anaerobic zone, some residual activated sludge outlet；
S7, sewage enter aerobic zone II from settling zone I, hydraulic detention time 1 day, under low strength COD environment, supplement one
Determine basicity, basicity maintains 250mg/L, depth nitration reaction, and abundant mineralized nitrogen is nitrate nitrogen；
S8, sewage enter settling zone II, precipitation surface load 0.8 from aerobic zone II, and the sludge reflux in settling zone II arrives
Aerobic zone II, excess activated sludge discharged to arrive aerobic zone I, waste water a part of the settling zone II of settling zone II is discharged, a part
Anaerobic zone is back to reflux ratio 100%.
Dissolved oxygen in anaerobic zone is less than 0.1mg/L, and the MLSS concentration in anaerobic zone is 10g/L；Dissolution in aerobic zone I
Oxygen is 1.8mg/L, and the MLSS concentration of aerobic zone I is 8.0g/L；The dissolved oxygen of aerobic zone II is 3mg/L, the MLSS of aerobic zone II
Concentration is 4g/L.Wherein, the volumetric ratio of anaerobic zone, aerobic zone I and aerobic zone II is 1:2:1.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Although more term is used more herein, it does not exclude the possibility of using other terms.Use these
Term is only for the convenience of describing and explaining the nature of the invention；It is construed as any additional limitation all
It is to be disagreed with spirit of that invention.
Claims (9)
1. a kind of leather-making waste water total nitrogen removal technique, which comprises the following steps:
Before S1, sewage enter biochemical treatment, wastewater influent Water-quality control range COD1500-2500mg/L, total nitrogen 150-300mg/
L；
S2, sewage enter anaerobic zone, hydraulic detention time 1 day, carry out pre-denitrification and denitrogenation, in the environment of anaerobism, utilize
Degradable COD in leather waste water carries out anti-nitration reaction, achievees the purpose that nitrate nitrogen is converted into nitrogen；
S3, sewage enter aerobic zone I from anaerobic zone, hydraulic detention time 2 days, synchronize nitrification and denitrification reaction, and detest
The basicity that oxygen area generates can supplement the basicity in aerobic zone I；
S4, the sewage of aerobic zone I is made to flow back into anaerobic zone, and the nitrate nitrogen in aerobic zone I with reflux ratio 100% by reflux pump
Denitrogenation is carried out with sewage backflow to anaerobic zone；
S5, sewage enter aerobic zone I from anaerobic zone, and add carbon source to aerobic zone I；
S6, sewage enter settling zone I from aerobic zone I, and precipitation surface load is 1.0, and the sludge in settling zone I is largely back to
Anaerobic zone, some residual activated sludge outlet；
S7, sewage enter aerobic zone II from settling zone I, hydraulic detention time 1 day, under low strength COD environment, supplement certain alkali
Degree, basicity maintain 200-300mg/L, depth nitration reaction, and abundant mineralized nitrogen is nitrate nitrogen；
S8, sewage enter settling zone II from aerobic zone II, precipitation surface load 0.8, and the sludge reflux in settling zone II is to aerobic
Area II, excess activated sludge discharged to arrive aerobic zone I, waste water a part of settling zone II is discharged, and a part is returned with reflux ratio 100%
It flow to anaerobic zone.
2. leather-making waste water total nitrogen removal technique according to claim 1, which is characterized in that the carbon source is methanol.
3. leather-making waste water total nitrogen removal technique according to claim 1, which is characterized in that the dissolution in the anaerobic zone
Oxygen is less than 0.1mg/L.
4. leather-making waste water total nitrogen removal technique according to claim 1, which is characterized in that molten in the aerobic zone I
Solution oxygen is 1-2mg/L.
5. leather-making waste water total nitrogen removal technique according to claim 1, which is characterized in that the MLSS in the anaerobic zone
Concentration is 8-10g/L.
6. leather-making waste water total nitrogen removal technique according to claim 1, which is characterized in that the MLSS of the aerobic zone I
Concentration is 8-10g/L.
7. leather-making waste water total nitrogen removal technique according to claim 1, which is characterized in that the dissolution of the aerobic zone II
Oxygen is 2-4mg/L.
8. leather-making waste water total nitrogen removal technique according to claim 1, which is characterized in that the MLSS of the aerobic zone II
Concentration is 3-5g/L.
9. leather-making waste water total nitrogen removal technique according to claim 1, which is characterized in that the anaerobic zone, aerobic zone I
Volumetric ratio with aerobic zone II is 1:2:1.
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| CN110902957A (en) * | 2019-12-06 | 2020-03-24 | 山东海景天环保科技股份公司 | Method for realizing synchronous desulfurization and denitrification of leather wastewater by using sulfur autotrophic denitrification process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101514069A (en) * | 2009-04-03 | 2009-08-26 | 北京首钢国际工程技术有限公司 | Coking wastewater biological denitrificaion treatment process |
| CN104098227A (en) * | 2014-07-15 | 2014-10-15 | 江南大学 | Method for treating kitchen anaerobic waste water through short-cut nitrification and denitrification |
| CN105036489A (en) * | 2015-08-21 | 2015-11-11 | 浙江大学 | Livestock/poultry culture wastewater deep denitrification and dephosphorization standard treatment device and process |
| CN205556234U (en) * | 2016-04-15 | 2016-09-07 | 邢彩凤 | Synchronous nitrification and denitrification biological denitrogenation and get rid of organic waste water COD's device |
| CN106830539A (en) * | 2017-02-28 | 2017-06-13 | 哈尔滨工业大学 | A kind of stage aeration rear-mounted denitrification denitrification dephosphorization apparatus and technique |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7481933B2 (en) * | 2006-04-11 | 2009-01-27 | Siemens Water Technologies Corporation | Process to improve the efficiency of a membrane filter activated sludge system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101514069A (en) * | 2009-04-03 | 2009-08-26 | 北京首钢国际工程技术有限公司 | Coking wastewater biological denitrificaion treatment process |
| CN104098227A (en) * | 2014-07-15 | 2014-10-15 | 江南大学 | Method for treating kitchen anaerobic waste water through short-cut nitrification and denitrification |
| CN105036489A (en) * | 2015-08-21 | 2015-11-11 | 浙江大学 | Livestock/poultry culture wastewater deep denitrification and dephosphorization standard treatment device and process |
| CN205556234U (en) * | 2016-04-15 | 2016-09-07 | 邢彩凤 | Synchronous nitrification and denitrification biological denitrogenation and get rid of organic waste water COD's device |
| CN106830539A (en) * | 2017-02-28 | 2017-06-13 | 哈尔滨工业大学 | A kind of stage aeration rear-mounted denitrification denitrification dephosphorization apparatus and technique |
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