CN102874932A - Method for improving sewage purification effect of combined vertical subsurface flow type artificial wetland - Google Patents
Method for improving sewage purification effect of combined vertical subsurface flow type artificial wetland Download PDFInfo
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- CN102874932A CN102874932A CN201210411011XA CN201210411011A CN102874932A CN 102874932 A CN102874932 A CN 102874932A CN 201210411011X A CN201210411011X A CN 201210411011XA CN 201210411011 A CN201210411011 A CN 201210411011A CN 102874932 A CN102874932 A CN 102874932A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention belongs to the technical field of environmental engineering, and particularly relates to a method for improving the sewage purification effect of a combined vertical subsurface flow type artificial wetland. The method comprises the following steps: firstly, artificially simulating carbon-load-different influent water concentrations of sewage; secondly, combining vertical subsurface flow type artificial wetlands two by two; then, testing the sewage purification effect of each combined vertical subsurface flow type artificial wetland under the condition of different influent water carbon load ratios, and determining the optimal influent water carbon load ratio and the combination type of the vertical subsurface flow type artificial wetlands; and finally, by using a method of adding methanol or urea or a method of mixing domestic sewage and industrial waste water in the actual sewage treatment process, enabling the pollutant load of raw sewage to reach the previously determined optimal influent water carbon load ratio, and treating with the previously determined combination type of the vertical subsurface flow type artificial wetlands. According to the method, the sewage purification effect of the combined vertical subsurface flow type artificial wetland can be obviously improved; and the method is simple and easy to implement and convenient to operate, and has good economic returns.
Description
Technical field
The invention belongs to field of environment engineering technology, be specifically related to a kind of method that improves combined vertical subsurface flow formula artificial swamp wastewater purifying efficiency.
Background technology
At present, artificial swamp has become a kind of very promising Pollutant Treatment mode.Artificial swamp often for the treatment of sewage with the purifying ecological system, itself because good in economic efficiency and development rapidly.Artificial swamp can be united use with treatment facilities such as natural wetland, sewage works, the organism during it can be disposed of sewage under different pollutant loads preferably.But the artificial swamp for single-stage, although its chemical oxygen demand (COD) (Chemical oxygen demand, COD) clearance is higher, but total nitrogen (Total nitrogen, TN) and the clearance of total phosphorus (Total phosphorus, TP) always be difficult to the level that reaches higher.Particularly artificial swamp is for the sewage that has various water inlet carbon load proportion, and its processing power fluctuation is larger, is exactly because the aerobic-anaerobic environment of single-stage artificial swamp is relatively poor.For example the artificial swamp of single-stage is because it can not provide aerobic and envrionment conditions anaerobism simultaneously, so under high loading carbon (C) and the plain flow condition of nitrogen (N), be difficult to obtain relatively high TN clearance.The combined artificial swamp that is got up by the single-stage artificial wetland combination then has good terms of settlement for this.Lot of documents shows that combined artificial swamp can obtain good COD and remove efficient, particularly can reach higher TP and the pollutants removal rate of TN.Therefore filtering out the optimum combined artificial wetland combination of two-stage, is significant especially for removal of pollutants in the sewage.More and more received again people's concern in the single-stage artificial swamp with vertical subsurface flow formula artificial swamp, it is because preferably oxygen transmission and exchange capacity and have the ability to process the pollutent of the various loads of machinery systems.The characteristics of vertical subsurface flow formula artificial swamp mainly comprise: outstanding oxygen carrying capacity, higher hydraulic load, all keep higher pollutants removal rate and take up an area little etc. under any season.Two kinds of modal vertical subsurface flow formula artificial swamp fluidised forms are to flow vertically upward (vertical up-flow, VUF) and vertically downward flow (vertical down-flow, VDF), they are considered to make up the two-stage artificial wetland combination that obtains high-efficient denitrification and dephosphorization and remove organic pollutant.Simultaneously, the water inlet Prevent Carbon Contamination thing load proportion of artificial swamp also has remarkably influenced for the pollutant purification effect of artificial swamp, when it just reaches or during near certain optimum load ratio, the aerobic-anaerobic environment of combined artificial swamp just can be brought into play maximum effectiveness.
Summary of the invention
The object of the present invention is to provide a kind of simple and easy to do, good in economic efficiency regulation and control water inlet carbon load proportion to improve the method for combined vertical subsurface flow formula artificial swamp wastewater purifying efficiency.Its concrete steps are as follows:
(1) the fixing concentration of nitrogen and phosphor contaminant and change the Prevent Carbon Contamination substrate concentration in the sewage of synthetic simulates high, normal, basic three kinds of different sewage water inlet carbon load proportions;
(2) will flow vertically upward (vertical up-flow, VUF) vertical subsurface flow formula artificial swamp and vertically downward stream (vertical down-flow, VDF) vertical subsurface flow formula artificial swamp be combined in twos VUF-VUF, VDF-VDF, VUF-VDF and four kinds of combined vertical subsurface flow formula artificial wetland combinations of VDF-VUF;
(3) wastewater purifying efficiency of four kinds of combined vertical subsurface flow formula artificial wetland combinations of test under high, normal, basic three kinds of different water inlet carbon load proportions is to determine best water inlet carbon load proportion and vertical subsurface flow formula artificial wetland combination type;
(4) then the pollutant load concentration of the actual required sewage to be processed of test regulate the pollutant load concentration of raw waste water to reach determined optimum value in the step (3) according to calculation result;
(5) process the sewage of regulating pollutant load concentration with the vertical subsurface flow formula artificial wetland combination of the best of determining in the step (3).
In present method, in the step (1) the carbon load proportion control method of synthetic sewage be according to the Organization for Economic Cooperation and Development (Organization for Economic Co-operation and Development, OECD) worked out in 1996 about aerobic process for treating sewage in the guilding principle of chemical substance simulation test finish.
In present method, flow vertically upward vertical subsurface flow formula artificial swamp and flow vertically downward vertical subsurface flow formula artificial swamp, remove fluidised form different beyond, other structural environments are identical; Artificial swamp is arranged in the cement pit, and gravel is arranged in its bottom, and slag is arranged on top, and the artificial swamp of each single-stage is planted calamus.
In present method, the water inlet carbon load proportion that synthetic sewage is simulated in the step (1) is carbon-nitrogen ratio (C/N) (9 ~ 11): 1, (4 ~ 6): 1 and (2 ~ 3): 1.
In present method, the pollutant load concentration of regulating raw waste water in the step (4) adopts the method for adding methyl alcohol or urea, the method that perhaps adopts sanitary sewage and trade effluent mutually to mix.
In present method, need to consider simultaneously chemical oxygen demand (COD) (Chemical oxygen demand for the decontamination effect improving of sewage in the step (3), COD), total nitrogen (Total nitrogen, TN) and the clearance of total phosphorus (Total phosphorus, TP) in the whole test period.
In present method, the test period is January April to next year.
The invention has the advantages that:
(1) the water inlet carbon load proportion of simulation synthetic sewage is carbon-nitrogen ratio (C/N) (9 ~ 11): 1, (4 ~ 6): 1 and (2 ~ 3): 1, its high, normal, basic three grades division can be contained general sewage characteristic substantially, and test result can reflect best water inlet carbon load proportion accurately;
(2) four kinds of combined vertical subsurface flow formula artificial swamp VUF-VUF, VDF-VDF, VUF-VDF and VDF-VUF have included the combined situation of various aerobic and anaerobism, have guaranteed that determined vertical subsurface flow formula artificial wetland combination type is optimum;
The pollutant load concentration of (3) regulating raw waste water can adopt the method for adding methyl alcohol or urea, if but want to reduce the consumption of pharmaceutical chemicals, the method that also can adopt more economic sanitary sewage and trade effluent mutually to mix so just can improve the economic and practical of the inventive method.
Description of drawings
The COD clearance of the different water inlet of the combined vertical subsurface flow formula of Fig. 1 artificial swamp carbon load: (a) C/N=(9 ~ 11): 1, (b) C/N=(4 ~ 6): 1, (c) C/N=(2 ~ 3): 1.
The TN clearance of the different water inlet of the combined vertical subsurface flow formula of Fig. 2 artificial swamp carbon load: (a) C/N=(9 ~ 11): 1, (b) C/N=(4 ~ 6): 1, (c) C/N=(2 ~ 3): 1.
The TP clearance of the different water inlet of the combined vertical subsurface flow formula of Fig. 3 artificial swamp carbon load: (a) C/N=(9 ~ 11): 1, (b) C/N=(4 ~ 6): 1, (c) C/N=(2 ~ 3): 1.
The best vertical subsurface flow formula of Fig. 4 artificial wetland combination type is at the pollutants removal rate of optimum water inlet carbon load.
Embodiment
The present invention will be described in detail below by embodiment and accompanying drawing.
A kind of carbon load proportion of regulating and control to intake improves the method for combined vertical subsurface flow formula artificial swamp wastewater purifying efficiency.Plan to build a vertical treatment capacity and be 100 tons/day combined vertical subsurface flow formula artificial swamp and process city domestic sewage.It at first tests the wastewater purifying efficiency of four kinds of combined vertical subsurface flow formula artificial wetland combinations under high, normal, basic three kinds of different water inlet carbon load proportions, to determine best water inlet carbon load proportion and vertical subsurface flow formula artificial wetland combination type; The pollutant load concentration of the required city domestic sewage to be processed of then test reality, the method that then adopts sanitary sewage and trade effluent mutually to mix according to calculation result is regulated the pollutant load concentration of raw waste water to reach previous determined optimum value; Vertical subsurface flow formula artificial wetland combination with previous the best of determining is processed the city domestic sewage of regulating pollutant load concentration, to reach best decontamination effect improving.
Below be concrete step:
The packing layer of the artificial swamp of single-stage consists of: the gravel (particle name median size is 1.45 cm) of 20 cm thickness has been arranged in the wetland bottom, and the thick slag of 45 cm (particle name median size is 1.75 cm) is arranged on wetland top; Will be through 6 cleanings, to remove its higher alkalescence before slag uses.Whole artificial wetland combination system comes the gravity water distribution by elevated tank, and wetland self then comes water distribution to arrive the wetland surface by the pvc tube (aperture that equidistant 2.5mm diameter is arranged on it) of diameter 5cm.It is the calamus of 10 ± 4 cm that the artificial swamp of each single-stage is planted 10 plant height degree, then fills with tap water one month, so that wetland plant can adapt to the wetland soil environment, also washes away the various pollutents that wet land filler itself may exist simultaneously.Supplied water 5 days in per seven days, repaired 2 days; Supply water first day sampling and testing one secondary data in 5 days, the mean value of 4 secondary data is as the monthly variation value per month.Test period is January April to next year.The fixing concentration of nitrogen and phosphor contaminant and change the Prevent Carbon Contamination substrate concentration in the sewage of synthetic, simulation carbon load proportion is high, normal, basic three kinds of different water inlet sewage loads of carbon-nitrogen ratio (C/N) 9:1,5:1 and 2.5:1, test respectively them for the wastewater purifying efficiency of four kinds of combined vertical subsurface flow formula artificial swamp VUF-VUF, VDF-VDF, VUF-VDF and VDF-VUF, the result is shown in Fig. 1 ~ 3.Consider the clearance of COD, TN and TP, VDF-VUF vertical subsurface flow formula artificial wetland combination wastewater purifying efficiency was best when water inlet carbon load proportion was 5:1, and its various removal of pollutants rates all are higher than other water inlet carbon load proportion and wetland combination.The pollutant load concentration of the actual required sewage to be processed of test, consequently carbon-nitrogen ratio (C/N) is 6.23, so mutually mix with the trade effluent that is rich in the N pollutent and sanitary sewage to be dealt with, reach into the optimum value of water carbon load proportion 5:1 with the water inlet C/N ratio that reduces raw waste water.With the sewage after the best vertical subsurface flow formula artificial wetland combination VDF-VUF processing regulation and control, its result shows that contaminant degradation is respond well, can reach the pollutants removal rate (Fig. 4) of maximum 96.49 ± 1.21% COD, 97.32 ± 1.34% TN and 94.31 ± 1.12% TP.
Claims (6)
1. method that improves combined vertical subsurface flow formula artificial swamp wastewater purifying efficiency is characterized in that concrete steps are:
(1) the fixing concentration of nitrogen and phosphor contaminant and change the Prevent Carbon Contamination substrate concentration in the sewage of synthetic simulates high, normal, basic three kinds of different sewage water inlet carbon load proportions;
(2) will flow vertically upward vertical subsurface flow formula artificial swamp and flow vertically downward vertical subsurface flow formula artificial swamp and be combined in twos four kinds of combined vertical subsurface flow formula artificial wetland combinations;
(3) wastewater purifying efficiency of four kinds of combined vertical subsurface flow formula artificial wetland combinations of test under high, normal, basic three kinds of different water inlet carbon load proportions is to determine best water inlet carbon load proportion and vertical subsurface flow formula artificial wetland combination type;
(4) the pollutant load concentration of the actual required sewage to be processed of test, then regulate the pollutant load concentration of raw waste water to reach determined optimum value in the step (3), use again the vertical subsurface flow formula artificial wetland combination of the best of determining in the step (3) to process the sewage of regulating pollutant load concentration.
2. the method for the combined vertical subsurface flow formula of raising according to claim 1 artificial swamp wastewater purifying efficiency, it is characterized in that, described vertical subsurface flow formula artificial swamp and the described vertical subsurface flow formula artificial swamp that flows vertically downward of flowing vertically upward, remove fluidised form different beyond, other structural environments are identical; Described artificial swamp is arranged in the cement pit, and gravel is arranged in its bottom, and slag is arranged on top, and the artificial swamp of each single-stage is planted calamus.
3. the method for the combined vertical subsurface flow formula of raising according to claim 1 artificial swamp wastewater purifying efficiency, it is characterized in that, the water inlet carbon load proportion that synthetic sewage is simulated described in the step (1) is respectively carbon-nitrogen ratio (9 ~ 11): 1, (4 ~ 6): 1 and (2 ~ 3): 1.
4. the method for the combined vertical subsurface flow formula of raising according to claim 1 artificial swamp wastewater purifying efficiency, it is characterized in that, the pollutant load concentration of regulating raw waste water described in the step (4) adopts the method for adding methyl alcohol or urea, or the method that adopts sanitary sewage and trade effluent mutually to mix.
5. the method for the combined vertical subsurface flow formula of raising according to claim 1 artificial swamp wastewater purifying efficiency, it is characterized in that, the decontamination effect improving of sewage need to be considered chemical oxygen demand (COD), total nitrogen and the total phosphorus clearance in the whole test period simultaneously described in the step (3).
6. the method for the combined vertical subsurface flow formula of raising according to claim 5 artificial swamp wastewater purifying efficiency is characterized in that, the described test period is January April to next year.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103755032A (en) * | 2014-01-13 | 2014-04-30 | 东北师范大学 | Combined artificial wetland sewage treatment system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101386451A (en) * | 2008-10-07 | 2009-03-18 | 华南农业大学 | Method for processing town sewage using composite vertical current artificial marshland and apparatus thereof |
| CN102616938A (en) * | 2012-04-09 | 2012-08-01 | 复旦大学 | Method for improving pollutant purification effect of artificial wetland by controlling carbon/nitrogen (C/N) ratio of inlet water |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101386451A (en) * | 2008-10-07 | 2009-03-18 | 华南农业大学 | Method for processing town sewage using composite vertical current artificial marshland and apparatus thereof |
| CN102616938A (en) * | 2012-04-09 | 2012-08-01 | 复旦大学 | Method for improving pollutant purification effect of artificial wetland by controlling carbon/nitrogen (C/N) ratio of inlet water |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103755032A (en) * | 2014-01-13 | 2014-04-30 | 东北师范大学 | Combined artificial wetland sewage treatment system |
| CN103755032B (en) * | 2014-01-13 | 2015-12-30 | 东北师范大学 | Combined artificial marsh sewage treatment system |
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Application publication date: 20130116 |