CN104176880A - Multi-stage serial modular domestic wastewater treatment system and domestic wastewater treatment method - Google Patents
Multi-stage serial modular domestic wastewater treatment system and domestic wastewater treatment method Download PDFInfo
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- CN104176880A CN104176880A CN201410378983.2A CN201410378983A CN104176880A CN 104176880 A CN104176880 A CN 104176880A CN 201410378983 A CN201410378983 A CN 201410378983A CN 104176880 A CN104176880 A CN 104176880A
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Abstract
The invention discloses a multi-stage serial modular domestic wastewater treatment system and a domestic wastewater treatment method, for solving the technical problem that the conventional rural domestic wastewater treatment facility is low in treatment efficiency, complex in process flow, high in operating and maintenance costs and high in management difficulty. The multi-stage serial modular domestic wastewater treatment system comprises a grating pond, a settling pond, an anaerobic pond, a facultative filter tank, a horizontal undercurrent artificial wetland, a vertical undercurrent artificial wetland and an effluent pond which are sequentially connected in series, wherein the grating pond is provided with a wastewater inlet, and the effluent pond is provided with a clean water outlet. A combined process of the multi-stage serial modular domestic wastewater treatment structure is designed and constructed, so that the wastewater treatment effect is further improved. The system and method are low in cost and convenient to construct, particularly suitable for rural areas with low population density. Compared with the conventional wastewater treatment facilities, the system and method are more economical and practical.
Description
Technical field
The present invention relates to technical field of sewage, be specifically related to a kind of plural serial stage modularization domestic sewage processing system and domestic sewage processing method.
Background technology
2013, China's sewage flow rate was unconventional and unrestrained to 75,000,000,000 m
3, wherein, domestic sewage in rural areas by using quantity discharged is 27,000,000,000 m
3.Rural domestic sewage treatment pattern, taking centralized processing as main, adopts this processing mode need set up a large amount of sewage network gathering systems and sewage works (factory) at present, and sewage is carried out to unified collection, conveying and processing, invests larger.The problem that existing rural domestic sewage treatment mode exists has: the one, and China's vast Rural areas fund weakness, pipe network gathering system and the facility for the central disposal of unable construction sanitary sewage; The 2nd, people in the countryside are sparsely populated, sanitary sewage inconvenience centralized collection and processing.Therefore,, for economics of underdevelopment, remoteness, Rural areas that the density of population is lower, centralized processing pattern is often because the reasons such as pipe network system is huge, construction cost is high, processing is underload are difficult to carry out.In addition, on regard to the impact of ecotope, easily cause pollution of waterhead with regard to sewage discharge, difficulty of governance is large.Therefore, in order to strengthen rural domestic sewage treatment coverage rate, improve rural domestic sewage treatment rate, must research and develop less investment, running maintenance convenience, the simple distributed sewage treatment system for rural life of technical process.
Summary of the invention
The present invention is intended to solve traditional technical problem that rural domestic sewage treatment facility processing efficiency is low, technical process is complicated, operation expense is high, management difficulty is large.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
Design a kind of plural serial stage modularization domestic sewage processing system, comprise grating tank, settling tank, anaerobic pond, hold concurrently oxygen filtering basin, horizontal drowned flow artificial wet land, vertical subsurface flow wetland and the outlet sump of series connection successively, described grating tank is provided with sewage inlet, and described outlet sump is provided with water purification water outlet; In described grating tank, be provided with grid and oil removal net; Top at described anaerobic pond is provided with self-regulating type methane anaerobic fermentation hood, in described anaerobic pond, is linked with 3 D elastic filler; The bottom of described double oxygen filtering basin reduces and is obliquely installed from its water inlet one side direction opposite side, in described double oxygen filtering basin, is provided with filter screen; The bottom of described vertical subsurface flow wetland is provided with the water distribution pipe network that is communicated with described horizontal drowned flow artificial wet land water outlet.
Preferably, the Grill space in described grating tank is 2.5～3.5mm, and described oil removal net is 150～300 orders.
Preferably, described anaerobic pond is the two-stage anaerobic pond being in series.
Preferably, on described 3 D elastic filler, be equipped with polyvinyl alcohol-sodium alginate gel ball and porous spherical floating stuffing.
Preferably, described polyvinyl alcohol-sodium alginate gel ball is made up after than blend by the quality of 6～10:1 of polyvinyl alcohol and sodium alginate.
Preferably, the filter screen in described double oxygen filtering basin is 60～150 object PVC filter screens.
Preferably, matrix in described horizontal drowned flow artificial wet land or vertical subsurface flow wetland is followed successively by from bottom to top: the gravel bed that is 10～15cm with the thickness that the gravel of diameter 45～60mm is laid, the metalling that is 10～15cm with the thickness that the rubble of diameter 25～45mm is laid, the vermiculite layers that is 10～15cm with the thickness that the vermiculite of diameter 0.8～25mm is laid, thickness is coarse sands layer and the fine sand layer of 10～15cm, and the thickness red soil soil layer that is 28～35cm, between every layer of matrix, separated by 60～150 object PVC graticule mesh.
Red soil is acid soil, has stronger phosphate fixation ability and the ability of the organic substance of dissolving; Vermiculite has higher resiliency and ion-exchange capacity.
Preferably, by weight percentage, contain attapulgite modifiedly 3～12% in described red soil soil layer, described attapulgite modified preparation method is as follows:
(1) pre-treatment: after attapulgite is ground, cross 20～100 mesh sieves, then calcine 3～5h at 200 DEG C, several all over to washing water clarification post-drying, for subsequent use with washing after deionized water immersion 20～30h;
(2) activation modification: the HAc solution that is 2～4% by volume fraction slowly dissolves a certain amount of chitosan, consumption is as the criterion with the chitosan gum liquid solution that is made into thickness, getting step gained attapulgite mixes and stirs into pasty state with a certain amount of this chitosan gum liquid solution, chitosan gum liquid solution consumption so that attapulgite fully infiltrated and be as the criterion, again that gained mashed prod is dry at 105 DEG C.
Attapulgite has unique chain layered crystal structure and very tiny bar-shaped, fibrous crystals form, and has many special physicochemical property, as adsorptivity, ion-exchange capacity and plasticity-etc.Attapulgite is carried out to suitable modification, can change its physicochemical property.What obtain through aforesaid method is attapulgite modified not only to Cu
2+, Pb
2+, Cd
2+, Zn
2+there are good adsorption and removal ability Deng metal ion and colourity, and in acid edatope, phosphate anion had to very high adsorptive power: protonated-OH in positively charged modified attapulgite soil particle and chitosan molecule
2 +with-NH
3 +h in adsorbent solution effectively
2p0
4 -, HPO
4 2-and PO
4 3-ion.
Preferably, on described horizontal drowned flow artificial wet land, plant calamus; On described vertical subsurface flow wetland, plant Pink Reineckea Herb.
Current, people depend on experience to a certain extent to the selection of wetland plant, and the systematic study that each kind of plant is applied to the effect of sewage disposal is comparatively lacked.Through systematic study, in the present invention, select to be respectively suitable for calamus and the Pink Reineckea Herb of horizontal drowned flow artificial wet land and vertical subsurface flow wetland; Wherein calamus is to TN, NH in low, middle concentration sewage
3-N, TP, COD
crclearance higher; Pink Reineckea Herb is less demanding to soil, strong adaptability, and its plant type grace, leaf look verdant, has ornamental value.
The domestic sewage processing method that adopts above-mentioned plural serial stage modularization domestic sewage processing system, comprises the following steps:
(1) sanitary sewage is introduced to described plural serial stage modularization domestic sewage processing system from sewage inlet, in grating tank, remove oarse-grained suspended substance and grease;
(2) sewage of step (1) gained flows into settling tank, precipitates after 10～15 hours, enters successively two-stage anaerobic pond, carries out totally 40～50 hours time of anaerobically fermenting;
(3) sewage of step (2) gained enters and holds concurrently the stop of oxygen filtering basin after 32～38 hours, enter successively horizontal drowned flow artificial wet land and vertical subsurface flow wetland, sewage is 20～25 hours by the time of two-stage artificial swamp, then enters outlet sump, completes the dirty water decontamination handles process.
Beneficial effect of the present invention is:
(1) design, built plural serial stage modularization sanitary sewage disposal structure, take anaerobic treatment and Combination System of Constructed Wetland flow process, can further improve wastewater treatment efficiency;
(2) in anaerobic pond, set up self-regulating type methane anaerobic fermentation hood and combining hydrophilic filler, can further improve the sewage disposal performance of system;
(3) system adopts the mode of sanitary sewage gravity flow, and application anaerobe technology and Artificial Wetland Techniques and principle, can effectively remove organic pollutant, pathogenic bacteria and part nitrogen, phosphorus etc. in sanitary sewage, cheap, easy construction;
(4) be specially adapted to the Rural areas that the density of population is lower, more practical more economically than traditional wastewater treatment facility, be China's vast Rural areas sanitary sewage centralized collection, processing, conveying water saving substantial contribution; Solve the environmental destruction problem that vast Rural areas pollution of area source causes.
Brief description of the drawings
Fig. 1 is the structural representation of plural serial stage modularization domestic sewage processing system of the present invention.
Fig. 2 is the process flow sheet of sewage water treatment method of the present invention.
Wherein, 1 is grating tank; 2 is settling tank; 3 is one-level anaerobic pond; 4 is secondary anaerobic pond; 5 is the oxygen filtering basin of holding concurrently; 6 is horizontal drowned flow artificial wet land; 7 is vertical subsurface flow wetland; 8 is outlet sump; 9 is grid; 10 is oil removal net; 11 is 3 D elastic filler; 12 is self-regulating type methane anaerobic fermentation hood; 13 is filter screen.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described, but following examples are just used for describing in detail the present invention, and limit the scope of the invention never in any form.
Embodiment 1: a kind of plural serial stage modularization domestic sewage processing system, comprise grating tank 1, settling tank 2, anaerobic pond, hold concurrently oxygen filtering basin 5, horizontal drowned flow artificial wet land 6, vertical subsurface flow wetland 7 and the outlet sump 8 of series connection successively, grating tank 1 is provided with sewage inlet, and outlet sump 8 is provided with water purification water outlet; In grating tank 1, be provided with grid 9 and oil removal net 10; Be provided with self-regulating type methane anaerobic fermentation hood 12 at the top of anaerobic pond, in anaerobic pond, be linked with 3 D elastic filler 11; The bottom of double oxygen filtering basin 5 reduces and is obliquely installed from its water inlet one side direction opposite side, in double oxygen filtering basin 5, is provided with filter screen 13; The bottom of vertical subsurface flow wetland 7 is provided with the water distribution pipe network that is communicated with described horizontal drowned flow artificial wet land 6 water outlets.
In grating tank 1, Grill space is 2.5mm, removes oarse-grained suspended substance in order to interception, and oil removal net is for removing the grease of kitchen waste water etc., and specification is 300 orders.
The self-regulating type methane anaerobic fermentation hood 12 arranging in anaerobic pond, adopt high-strength composite rubber-plastic material, the transport that has solved traditional methane tank, flexible methane bag, glass fiber reinforced plastic digester gas tank be difficult for, produce difficulty, higher, the easy gas leakage of cost, input and output material inconvenience, clearly pond difficult, there is the drawbacks such as potential safety hazard.Self-regulating type methane anaerobic fermentation hood has following characteristics: (1) resistance to air loss is good, increases anaerobic pond anaerobism stopping property, more meets anaerobically fermenting environment; (2) have insulation effect, continuing fermentation temperature is high; (3) the continuing fermentation time long, effectively pathogenic microbe killing.
Employing hillside fields technology at the bottom of the pond of double oxygen filtering basin 5, inside establishes filter screen 13, has realized sewage solid-liquid separation in degradation of contaminant.Filter screen 13 is 150 order PVC filter screens, for filtering the active sludge that is suspended on a small quantity water body.
Matrix in horizontal drowned flow artificial wet land 6, vertical subsurface flow wetland 7 is followed successively by from bottom to top: the gravel bed that is 10～15cm with the thickness that the gravel of diameter 45～60mm is laid, the metalling that is 10～15cm with the thickness that the rubble of diameter 25～45mm is laid, the vermiculite layers that is 10～15cm with the thickness that the vermiculite of diameter 0.8～25mm is laid, thickness is coarse sands layer and the fine sand layer of 10～15cm, and the thickness red soil soil layer that is 28～35cm, between every layer of matrix, separated by 100 object PVC graticule mesh.On horizontal drowned flow artificial wet land 6, plant calamus; On vertical subsurface flow wetland 7, plant Pink Reineckea Herb.
Embodiment 2: be with the difference of embodiment 1, by weight percentage, contain attapulgite modifiedly 3～12% in red soil soil layer, this attapulgite modified preparation method is as follows:
(1) pre-treatment: after attapulgite is ground, cross 20～100 mesh sieves, then calcine 3～5h at 200 DEG C, several all over to washing water clarification post-drying, for subsequent use with washing after deionized water immersion 20～30h;
(2) activation modification: the HAc solution that is 2～4% by volume fraction slowly dissolves a certain amount of chitosan, consumption is as the criterion with the chitosan gum liquid solution that is made into thickness, getting step gained attapulgite mixes and stirs into pasty state with a certain amount of this chitosan gum liquid solution, chitosan gum liquid solution consumption so that attapulgite fully infiltrated and be as the criterion, again that gained mashed prod is dry at 105 DEG C.
Embodiment 3: a kind of plural serial stage modularization domestic sewage processing system, be with the difference of embodiment 1, anaerobic pond is one-level anaerobic pond 3 and the secondary anaerobic pond 4 being in series, and is equipped with polyvinyl alcohol-sodium alginate gel ball and porous spherical floating stuffing on 3 D elastic filler 11.The preparation method of this polyvinyl alcohol-sodium alginate gel ball is: get polyvinyl alcohol and sodium alginate that mass ratio is 9:1, adopt solution blended process preparation.
The mode treatment sewage that adopts the series connection of two-stage anaerobic pond, can effectively improve organism anaerobic digestion effect.On 3 D elastic filler, be equipped with polyvinyl alcohol-sodium alginate gel ball and porous spherical floating stuffing, polyvinyl alcohol (PVA)-sodium alginate (SA) gel ball adopts solution blended process preparation, blending ratio: m (PVA): m (SA)=9:l.After the water suction of polyvinyl alcohol～sodium alginate gel ball, diameter is for being about 5mm, after polyvinyl alcohol-sodium alginate gel ball is dry, diameter is 1～2mm, the slightly coarse apposition growth that is conducive to microorganism in surface, inside has part space to exist, and has good water absorbing properties and water quality transmission capacity.This filler can be keeping wetting ability and the bioaffinity that conventional stereo elastic filler biofilm amount is many, strengthened filler in without advantages such as clustering phenomenas, be convenient to microbial immobilization growth, reduce the biofilm cycle, keeping can thering is higher volumetric loading in low sludge content in pond, engineering operation rate is improved.
The technical process that plural serial stage modularization domestic sewage processing system in employing embodiment 3 carries out sewage disposal is:
(1) sanitary sewage is introduced to this plural serial stage modularization domestic sewage processing system from sewage inlet, in grating tank, remove oarse-grained suspended substance and grease;
(2) sewage of step (1) gained flows into settling tank, precipitates after 15 hours, enters successively two-stage anaerobic pond, carries out the totally 48 hours time of anaerobically fermenting;
(3) sewage of step (2) gained enters and holds concurrently the stop of oxygen filtering basin after 35 hours, enter successively horizontal drowned flow artificial wet land and vertical subsurface flow wetland, sewage is 24 hours by the time of two-stage artificial swamp, then enters outlet sump, completes the dirty water decontamination handles process.
The effect of carrying out sewage disposal in order to detect this plural serial stage modularization domestic sewage processing system is grating tank and settling tank processing unit, two-stage biological anaerobic pond and double oxygen filtering basin processing unit, two-stage artificial swamp processing unit by system divides.Respectively in sanitary sewage influent quality, settling tank, hold concurrently in oxygen filtering basin and effluent quality detects, test item and method are as shown in table 1 below.
(1) COD removal effect
During plural serial stage modularization domestic sewage processing system of the present invention steady running, system effluent COD concentration is subject to the impact of influent concentration less, although inlet COD concentration fluctuation is larger, system effluent COD concentration is more stable.
System inlet COD concentration is 186.50～482.60mg/L, mean value is 334.55mg/L, after grating tank and settling tank, COD concentration has had reduction to a certain degree, drop to 110.00～270.00mg/L, mean value is 225.00mg/L, and grating tank and settling tank processing unit are 31.23%～39.28% to the clearance of COD, and mean value is 34.36%.After two-stage biological anaerobic pond and double oxygen filtering basin processing unit processes, COD concentration has had larger reduction, obviously drop to 48.14～102.71mg/L, average out to 85.47mg/L, two-stage biological anaerobic pond and double oxygen filtering basin processing unit are 59.14%～68.37% to the clearance of COD, average out to 63.52%, contribution is maximum.After two-stage artificial swamp processing unit processes, COD is further removed, and density loss is 22.10～42.20mg/L, and mean value is 32.25mg/L, and two-stage artificial swamp processing unit is 49.58%～60.28% to the clearance of COD, average out to 55.37%.COD the removal rates of system is 88.15%～91.3%, and mean value is 89.52%.
(2) NH
3-N removal effect
During system stable operation, NH in water inlet
3the concentration of-N is between 18.52～40.64mg/L, and mean value is 30.18mg/L, after grating tank and settling tank, and NH
3-N concentration decreases, and has dropped to 13.28～25.37mg/L, and mean value is 19.84mg/L, and grating tank and settling tank processing unit are 15.39%～42.68% to the clearance of NH3～N, and average removal rate is 28.35%.After two-stage biological anaerobic pond and double oxygen filtering basin processing unit processes, NH3-N concentration has had further reduction, drop to 7.31～13.74mg/L, average out to 10.48mg/L, two-stage biological anaerobic pond and double oxygen filtering basin processing unit are 35.81%～56.68% to the clearance of NH3-N, and average removal rate is 45.14%.After two-stage artificial swamp processing unit processes, NH3-N has had larger reduction, density loss is 3.24～7.38mg/L, mean value is 5.42mg/L, two-stage artificial swamp processing unit is 39.82%～58.16% to the clearance of NH3-N, average out to 49.28%, clearance maximum in system each processing unit.NH
3-N the removal rates of system is 73.16%～86.59%, and mean value is 79.84%.
(3) TN removal effect
During system stable operation, the influent concentration of TN is between 19.63～45.52mg/L, mean value is 34.67mg/L, after grating tank and settling tank, in sewage, TN concentration slightly reduces, and has dropped to 18.34～40.11mg/L, and mean value is 32.13mg/L, grating tank and settling tank processing unit are 1.24%～11.69% to the clearance of TN, and average removal rate is 7.13%.After two-stage biological anaerobic pond and double oxygen filtering basin processing unit processes, TN concentration has had significantly reduction, drop to 8.13～21.18mg/L, average out to 16.57mg/L, two-stage biological anaerobic pond and double oxygen filtering basin processing unit are 38.54%～54.37% to the clearance of TN, and average removal rate is 44.85%.After two-stage artificial swamp processing unit processes, TN has had larger reduction, density loss is 4.37～11.25mg/L, mean value is 7.86mg/L, two-stage artificial swamp processing unit is 37.68%～59.82% to the clearance of IN, average removal rate is 50.47%, and system is removed to TN contribution maximum.TN the removal rates of system is 63.47%～84.26%, and mean value is 74.55%.The good major cause of two-stage artificial swamp processing unit denitrification effect is in wetland, to exist numerous aerobic, anaerobism and anoxic zones, has nitrification and denitrification effect relatively preferably.
(4) TP removal effect
During system stable operation, the influent concentration of TP is between 1.8～9.5mg/L, mean value is 5.6mg/L, after grating tank and settling tank, TP change in concentration is little, has dropped to 1.7～9.1mg/L, and mean value is 5.1mg/L, grating tank and settling tank unit are 2.11%～5.24% to the clearance of TP, and average removal rate is 4.57%.After two-stage biological anaerobic pond and double oxygen filtering basin cell processing, TP concentration slightly reduces, and drops to 1.1～7.0mg/L, average out to 4.2mg/L, two-stage biological anaerobic pond and double oxygen filtering basin processing unit are 8.65%～24.78% to the clearance of TP, and average removal rate is 16.95%.After two-stage artificial swamp processing unit processes, TN has had remarkable reduction, and density loss is 0.37～l.04mg/L, mean value is 0.68mg/L, two-stage artificial swamp processing unit is 68.34%～88.19% to the clearance of TP, average out to 80.16%, and it is maximum removing contribution rate.TP the removal rates of system is 78.18%～90.22%, and mean value is 85.17%.
In sum, plural serial stage modularization domestic sewage processing system of the present invention adopts the mode of sanitary sewage gravity flow, application anaerobe technology and Artificial Wetland Techniques combinatorial principle, can effectively remove organic pollutant, pathogenic bacteria and part nitrogen, phosphorus etc. in sanitary sewage, cheap, easy construction, running maintenance is simple with management, technical process is simplified, reach the object of purifying domestic sewage, can adapt to the needs of rural domestic sewage treatment, be China's vast Rural areas sanitary sewage centralized collection, processing, conveying water saving substantial contribution.
In conjunction with the accompanying drawings and embodiments the present invention is described in detail above, but, person of ordinary skill in the field can understand, do not departing under the prerequisite of aim of the present invention, can also change each design parameter in above-described embodiment, form multiple specific embodiments, be common variation range of the present invention, describe in detail no longer one by one at this.
Claims (10)
1. a plural serial stage modularization domestic sewage processing system, it is characterized in that, comprise grating tank, settling tank, anaerobic pond, hold concurrently oxygen filtering basin, horizontal drowned flow artificial wet land, vertical subsurface flow wetland and the outlet sump of series connection successively, described grating tank is provided with sewage inlet, and described outlet sump is provided with water purification water outlet; In described grating tank, be provided with grid and oil removal net; Top at described anaerobic pond is provided with self-regulating type methane anaerobic fermentation hood, in described anaerobic pond, is linked with 3 D elastic filler; The bottom of described double oxygen filtering basin reduces and is obliquely installed from its water inlet one side direction opposite side, in described double oxygen filtering basin, is provided with filter screen; The bottom of described vertical subsurface flow wetland is provided with the water distribution pipe network that is communicated with described horizontal drowned flow artificial wet land water outlet.
2. plural serial stage modularization domestic sewage processing system according to claim 1, is characterized in that, the Grill space in described grating tank is 2.5～3.5mm, and described oil removal net is 150～300 orders.
3. plural serial stage modularization domestic sewage processing system according to claim 1, is characterized in that, described anaerobic pond is the two-stage anaerobic pond being in series.
4. plural serial stage modularization domestic sewage processing system according to claim 1, is characterized in that, is equipped with polyvinyl alcohol-sodium alginate gel ball and porous spherical floating stuffing on described 3 D elastic filler.
5. plural serial stage modularization domestic sewage processing system according to claim 4, is characterized in that, described polyvinyl alcohol-sodium alginate gel ball is made up after than blend by the quality of 6～10:1 of polyvinyl alcohol and sodium alginate.
6. plural serial stage modularization domestic sewage processing system according to claim 1, is characterized in that, the filter screen in described double oxygen filtering basin is 60～150 object PVC filter screens.
7. plural serial stage modularization domestic sewage processing system according to claim 1, it is characterized in that, matrix in described horizontal drowned flow artificial wet land or vertical subsurface flow wetland is followed successively by from bottom to top: the gravel bed that is 10～15cm with the thickness that the gravel of diameter 45～60mm is laid, the metalling that is 10～15cm with the thickness that the rubble of diameter 25～45mm is laid, the vermiculite layers that is 10～15cm with the thickness that the vermiculite of diameter 0.8～25mm is laid, thickness is coarse sands layer and the fine sand layer of 10～15cm, and the thickness red soil soil layer that is 28～35cm, between every layer of matrix, separated by 60～150 object PVC graticule mesh.
8. plural serial stage modularization domestic sewage processing system according to claim 7, is characterized in that, by weight percentage, contains attapulgite modifiedly 3～12% in described red soil soil layer, and described attapulgite modified preparation method is as follows:
(1) pre-treatment: after attapulgite is ground, cross 20～100 mesh sieves, then calcine 3～5h at 200 DEG C, several all over to washing water clarification post-drying, for subsequent use with washing after deionized water immersion 20～30h;
(2) activation modification: the HAc solution that is 2～4% by volume fraction slowly dissolves a certain amount of chitosan, consumption is as the criterion with the chitosan gum liquid solution that is made into thickness, getting step gained attapulgite mixes and stirs into pasty state with a certain amount of this chitosan gum liquid solution, chitosan gum liquid solution consumption so that attapulgite fully infiltrated and be as the criterion, again that gained mashed prod is dry at 105 DEG C.
9. plural serial stage modularization domestic sewage processing system according to claim 7, is characterized in that, on described horizontal drowned flow artificial wet land, plants calamus; On described vertical subsurface flow wetland, plant Pink Reineckea Herb.
10. a domestic sewage processing method that adopts plural serial stage modularization domestic sewage processing system described in claim 1, is characterized in that, comprises the following steps:
(1) sanitary sewage is introduced to described plural serial stage modularization domestic sewage processing system from sewage inlet, in grating tank, remove oarse-grained suspended substance and grease;
(2) sewage of step (1) gained flows into settling tank, precipitates after 10～15 hours, enters successively two-stage anaerobic pond, carries out totally 40～50 hours time of anaerobically fermenting;
(3) sewage of step (2) gained enters and holds concurrently the stop of oxygen filtering basin after 32～38 hours, enter successively horizontal drowned flow artificial wet land and vertical subsurface flow wetland, sewage is 20～25 hours by the time of two-stage artificial swamp, then enters outlet sump, completes the dirty water decontamination handles process.
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