CN102963982A - Method for advanced treatment of domestic sewage through combination of constructed wetland and vermi-biofilter (VBF) - Google Patents
Method for advanced treatment of domestic sewage through combination of constructed wetland and vermi-biofilter (VBF) Download PDFInfo
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- CN102963982A CN102963982A CN2012104394323A CN201210439432A CN102963982A CN 102963982 A CN102963982 A CN 102963982A CN 2012104394323 A CN2012104394323 A CN 2012104394323A CN 201210439432 A CN201210439432 A CN 201210439432A CN 102963982 A CN102963982 A CN 102963982A
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Abstract
The invention belongs to the technical field of environmental engineering, and particularly relates to a method for the advanced treatment of domestic sewage through a combination of a constructed wetland and a vermi-biofilter (VBF). The method comprises the following steps: combining a vertical subsurface flow constructed wetland (VSFCW) and a VBF, thus forming a VSFCW-VBF treatment combination or a VBF-VSFCW treatment combination; using artificially synthesized domestic sewage as influent water, and simulating three concentrations, namely a carbon-nitrogen ratio (C/N) pollution load concentration, a medium C/N pollution load concentration and a high C/N pollution load concentration; testing pollutant removal effects of the VSFCW-VBF and the VBF-VSFCW under the conditions of different C/N pollution load concentrations in a whole year; and finally, comprehensively considering the chemical oxygen demand and the total nitrogen and total phosphorus removal rate, and determining an optimal combination to treat actual domestic sewage. The method provided by the invention can remarkably improve the advanced treatment effect of domestic sewage, is simple and easy to implement and convenient to operate and has good economic benefits.
Description
Technical field
The invention belongs to field of environment engineering technology, be specifically related to the method that a kind of artificial swamp and earthworm and ecological filter combined depth are processed sanitary sewage.
Background technology
The processing of general sanitary sewage will be passed through three steps at least: pre-treatment, primary treatment and second-stage treatment.Pre-treatment is removed the bigger material that diminishes equipment with grid usually; Suspended substance in the waste water generally passes through primary treatment, adopt hold back, the method for precipitation and sand setting, just the organism of the solids such as silt and a small amount of corruption can be removed; And the colloidal impurity methods that belong to second-stage treatment that adopt are processed more, and most of organism all is removed in this stage.After primary treatment and second-stage treatment, general sewage all can reach urban wastewater treatment firm pollutant emission standard (GB18918-2002), but in its strictest one-level A standard, chemical oxygen demand (COD) (COD, chemical oxygen demand) has reached 50 mg L
-1, total nitrogen (TN, total nitrogen) reached 15 mg L
-1, total phosphorus (TP, total phosphorus) builds according to sewage work and successively also reached 1 mg L
-1Perhaps 0.5 mg L
-1And the poorlyest in the water environment quality standard (GB 3838-2002) mainly be applicable to the agricultural water district and general view requires the V class water quality standard in waters to be: COD40 mg L
-1, TN2 mg L
-1, TP0.4 mg L
-1(wherein lake, storehouse are 0.2 mg L
-1).Reached the strictest one-level A standard in the urban wastewater treatment firm pollutant emission standard (GB18918-2002) even this shows the sewage that general sewage work discharges, it does not still reach the poorest V class water quality standard in the water environment quality standard (GB 3838-2002), is to cause negative impact to the natural water environment so directly discharge it if the water outlet of sewage work is not carried out advanced treatment.
From 1903 in the world first artificial swamp that is used for sewage disposal since being born in state, Britain York, the artificial wet land water quality purification techniques is low with its investment working cost gradually, effluent quality is effective, running maintenance is simple, unit consumption of energy is low, eco-environmental impact is little, be widely used in again the sewage treatment area of countries in the world with certain landscape ecological effect, its range of application is developed into for rural sewage gradually by original Treating Municipal Sewage, trade effluent, contain difficult degradation pollutent sewage, in the processing of the other industry waste water such as Food-processing industry sewage.Earthworm and ecological filter is processed sanitary sewage, is widely applied to rural area nitrogen, phosphorus pollution of area source control field as a kind of emerging Ecological Disposal technology, has less investment, instant effect, high treating effect.It has the ecological functions such as the soil aeration of raising water permeability and the conversion of promotion organic substance decomposing and designs according to earthworm, integrate the functions such as physical filtering, absorption, aerobic decomposition and sludge treatment, utilize that filtrate is held back, earthworm and microorganism are decomposed and utilize organism and the nutrition in sewage and the mud and have the nitrification and denitrification effect that promotes nitrogenous substances, are a kind of ecological type sewage mud synchronous processing new technologies.Therefore the advanced treatment of carrying out sanitary sewage that artificial swamp and earthworm and ecological filter combined is the important process that the utmost point has practicality and novelty.
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 artificial swamp and the method for earthworm and ecological filter combined depth processing sanitary sewage.
Artificial swamp provided by the invention and earthworm and ecological filter combined depth are processed the method for sanitary sewage, and concrete steps are as follows:
(1) with vertical subsurface flow formula artificial swamp (VSFCW, Vertical Subsurface Flow Constructed Wetlands) and earthworm and ecological filter (VBF, Vermi-Biofilter) consist of VSFCW-VBF and two kinds of combinations of VBF-VSFCW according to sequencing;
(2) sanitary sewage that adopts synthetic is as water inlet, simulates carbon-nitrogen ratio (C/N) pollution load and be three kinds of high concentration in 2.5:1,5:1 and 10:1 low;
(3) test VSFCW-VBF and the chemical oxygen amount (COD of VBF-VSFCW under different C/N pollution load concentration conditions, chemical oxygen demand), total nitrogen (TN, total nitrogen) and total phosphorus (TP, total phosphorus) clearance, thus actual sanitary sewage is processed in the combination of determining optimum VSFCW and VBF.
In present method,, be provided with two kinds of array modes of VSFCW-VBF and VBF-VSFCW, thereby comprehensively considered various possible potential influencing each other in vertical subsurface flow formula artificial swamp and the earthworm and ecological filter combination.
In present method, the prescription of the sanitary sewage of the low middle Senior Three kind load concentration of synthetic is according to (the OECD of the Organization for Economic Cooperation and Development, Organisation for Economic Co-operation and Development) worked out in 1996 about aerobic process for treating sewage in guilding principle (the Guidelines for Testing of Chemicals Simulation Tests-Aerobic Sewage Treatment of chemical substance simulation test, Technical Report) designs, so just guaranteed the consistence of manual simulation's sewage and real life sewage character.
In present method, the C/N of the sanitary sewage of Senior Three kind load concentration is respectively 2.5:1,5:1 and 10:1 in synthetic low, has so just considered that comprehensively artificial swamp and earthworm and ecological filter are combined in the contaminant degradation effect under the various possible sanitary sewage concentration flow conditions.
In present method, the sanitary sewage that C/N is respectively Senior Three kind load concentration in 2.5:1,5:1 and 10:1 low is that configuration is out in the situation of the fixed nitrogen load concentration (TN) changing water inlet carbon load concentration (COD).
In present method, be continuous a year and a day the experimental period of VSFCW-VBF and VBF-VSFCW, so just can avoid because of seasonal variation the treatment effect of artificial swamp and earthworm and ecological filter combination being exerted an influence.
The invention has the advantages that:
(1) considers two kinds of array modes of VSFCW-VBF and VBF-VSFCW, thereby comprehensively analyzed various possible potential influencing each other in vertical subsurface flow formula artificial swamp and the earthworm and ecological filter combination.
(2) C/N of the sanitary sewage of Senior Three kind load concentration is respectively 2.5:1,5:1 and 10:1 in synthetic low, has considered that comprehensively artificial swamp and earthworm and ecological filter are combined in the contaminant degradation effect under the various possible sanitary sewage concentration flow conditions.
(3) be continuous a year and a day the experimental period of VSFCW-VBF and VBF-VSFCW, thereby eliminated the impact of seasonal variation for the treatment effect of artificial swamp and earthworm and ecological filter combination.
Description of drawings
The clearance of COD under the different influent load conditions of Fig. 1: (a) C/N 2.5:1; (b) C/N 5:1; (c) C/N 10:1.
The clearance of TN under the different influent load conditions of Fig. 2: (a) C/N 2.5:1; (b) C/N 5:1; (c) C/N 10:1.
The clearance of TP under the different influent load conditions of Fig. 3: (a) C/N 2.5:1; (b) C/N 5:1; (c) C/N 10:1.
The pollutants removal rate of Fig. 4 artificial swamp and earthworm and ecological filter combined treatment real life sewage.
Embodiment
The present invention will be described in detail below by embodiment.
Embodiment
A kind of artificial swamp and earthworm and ecological filter combined depth are processed the method for sanitary sewage.Wanting to build a treatment capacity and be 100 tons/day artificial swamp and earthworm and ecological filter combined system comes the sanitary sewage of certain residential quarter is carried out advanced treatment.Consider that VSFCW-VBF and VBF-VSFCW are combined in the treatment of domestic sewage advanced decontamination effect improving under three kinds of water inlet pollution load concentration conditions that C/N is respectively 2.5:1,5:1 and 10:1, to determine best artificial swamp and earthworm and ecological filter array configuration, process actual sanitary sewage with it.
Below be concrete step:
VSFCW and VBF are consisted of VSFCW-VBF and two kinds of combinations of VBF-VSFCW.The packing layer of VSFCW consists of: the gravel (particle name median size is 1.65 cm) of 20 cm thickness has been arranged in the wetland bottom, and the thick slag of 45 cm (particle name median size is 1.35 cm) is arranged on wetland top; Will be through 6 cleanings, to remove its higher alkalescence before slag uses.Wetland self comes water distribution to arrive the wetland surface by the pvc tube (aperture that equidistant 3.0 mm diameters are arranged on it) of diameter 5cm.It is the calamus of 12.5 ± 1.5 cm that each VSFCW plants 8 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.The filler of VBF is from bottom to top: the large gravel of 3 cm thickness (particle name median size is 35 –, 45 mm), the haydite of 10 cm thickness (particle name median size is 20 –, 40 mm), the mixolimnion (particle name median size is 1 –, 5 mm) of the sand that 5 cm are thick (particle name median size is 0-1 mm) and rubble, the Artificial Soil that 35 cm are thick.Earthworm is used
EiseniafetidaIt is the Spiked Loosestrife of 10.5 ± 1.5 cm that (Ohira 2nd), each VBF plant 6 plant height degree.
Whole combined system is come the gravity water distribution by elevated tank; Per seven days is one-period, wherein supplies water 5 days, repairs 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 average changing value per month.Change inlet COD loading concentration, fixedly TN load concentration makes the low middle Senior Three kind sanitary sewage influent concentration that C/N is respectively 2.5:1,5:1 and 10:1.Its prescription is: 100,200 and 400 g m
3Glucose; 80 g m
3Urea; 15 g m
3NaH
2PO
41.5 g m
3KH
2PO
44 g m
3CaCl
2With 2 g m
3MgSO
4Consider COD, TN and the TP clearance under various water inlet pollutant load concentration conditions, obtaining VSFCW-VBF is optimum artificial swamp and earthworm and ecological filter combination (Fig. 1 ~ 3).It processes the contaminant degradation effect fine (Fig. 4) of certain residential quarter real life sewage, and the clearance of COD, TN and TP is respectively 91.56 ± 2.94%, 91.23 ± 2.03% and 91.23 ± 1.93%, goes out water concentration and is respectively 13.82 ± 1.04 mg L
-1, 0.43 ± 0.05 mg L
-1With 0.07 ± 0.01 mg L
-1Reach the II class water quality standard in the water environment quality standard (GB 3838-2002), gone for the feeding ground of first class of protection district, centralized Drinking Water surface water seedbed, rare aquatic life habitat, fish and shrimp product field, larvae juvenile fish etc.
Claims (2)
1. an artificial swamp and earthworm and ecological filter combined depth are processed the method for sanitary sewage, it is characterized in that concrete steps are:
(1) vertical subsurface flow formula artificial swamp (VSFCW) and earthworm and ecological filter (VBF) are consisted of VSFCW-VBF and two kinds of combinations of VBF-VSFCW according to sequencing;
(2) sanitary sewage that adopts synthetic is as water inlet, simulates carbon-nitrogen ratio (C/N) pollution load and be three kinds of high concentration in 2.5:1,5:1 and 10:1 low;
(3) clearance of test VSFCW-VBF and chemical oxygen amount, total nitrogen and the total phosphorus of VBF-VSFCW under different C/N pollution load concentration conditions, thus actual sanitary sewage is processed in the combination of determining optimum VSFCW and VBF.
2. a kind of artificial swamp according to claim 1 and earthworm and ecological filter combined depth are processed the method for sanitary sewage, it is characterized in that be continuous a year and a day the experimental period of VSFCW-VBF and VBF-VSFCW.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108147624A (en) * | 2018-01-25 | 2018-06-12 | 南昌工程学院 | A kind of processing method of country sewage |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6277274B1 (en) * | 1999-04-16 | 2001-08-21 | Larry Steven Coffman | Method and apparatus for treating stormwater runoff |
| CN101284705A (en) * | 2008-01-23 | 2008-10-15 | 南京大学 | Tower type earthworm and ecological filter for treating sewage |
| CN102603111A (en) * | 2011-01-21 | 2012-07-25 | 北京林业大学 | Quick-start unpowered biologically enhanced constructed wetland system suitable for treating domestic sewage and waste water in small towns |
| CN102674631A (en) * | 2012-05-10 | 2012-09-19 | 复旦大学 | Method and system for advanced treatment of centralized rural domestic sewage |
-
2012
- 2012-11-07 CN CN2012104394323A patent/CN102963982A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6277274B1 (en) * | 1999-04-16 | 2001-08-21 | Larry Steven Coffman | Method and apparatus for treating stormwater runoff |
| CN101284705A (en) * | 2008-01-23 | 2008-10-15 | 南京大学 | Tower type earthworm and ecological filter for treating sewage |
| CN102603111A (en) * | 2011-01-21 | 2012-07-25 | 北京林业大学 | Quick-start unpowered biologically enhanced constructed wetland system suitable for treating domestic sewage and waste water in small towns |
| CN102674631A (en) * | 2012-05-10 | 2012-09-19 | 复旦大学 | Method and system for advanced treatment of centralized rural domestic sewage |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108147624A (en) * | 2018-01-25 | 2018-06-12 | 南昌工程学院 | A kind of processing method of country sewage |
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Application publication date: 20130313 |