CN106630170A - Sewage underground percolation system for treating low-carbon-to-ammonium-ratio domestic sewage - Google Patents

Sewage underground percolation system for treating low-carbon-to-ammonium-ratio domestic sewage Download PDF

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CN106630170A
CN106630170A CN201710058738.7A CN201710058738A CN106630170A CN 106630170 A CN106630170 A CN 106630170A CN 201710058738 A CN201710058738 A CN 201710058738A CN 106630170 A CN106630170 A CN 106630170A
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carbon
sewage
accounts
gravel layer
low ratio
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CN201710058738.7A
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CN106630170B (en
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姜彬慧
贾丽萍
李春月
窦丹妮
赵研
黄菲
胡筱敏
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东北大学
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/32Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/34Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/16Nitrogen compounds, e.g. ammonia

Abstract

The invention belongs to the technical field of domestic sewage purification, and particularly relates to a sewage underground percolation system for treating low-carbon-to-ammonium-ratio domestic sewage. The sewage underground percolation system has the technical scheme that the sewage underground percolation system comprises a casing, plants, a modified biological matrix layer a, a gravel layer a, a modified biological matrix layer b, a gravel layer b, a water inlet device and a water outlet device, wherein the plants, the modified biological matrix layer a, the gravel layer a, the modified biological matrix layer b and the gravel layer b are arranged in the casing from top to bottom; the water inlet device is arranged in the gravel layer a; the water outlet device is arranged in the gravel layer b; a cylindrical water outlet hole is formed in the bottom of the casing; the water outlet device is connected with the cylindrical body water outlet hole. The sewage underground percolation system for treating the low-carbon-to-ammonium-ratio domestic sewage provided by the invention has the advantages through the modified biological matrix and microorganism immobilization reinforcement, the removal efficiency of various pollutants is high; meanwhile, the long-time stable operation of the sewage underground percolation system is ensured.

Description

A kind of underground sewage percolating system for processing low ratio of carbon to ammonium sanitary sewage
Technical field
The invention belongs to purifying domestic sewage technical field, and in particular to a kind of sewage of process low ratio of carbon to ammonium sanitary sewage Subsurface wastewater infiltration system.
Background technology
With developing rapidly for China's economy, people's living standard is gradually stepped up, and the discharge capacity in a organized way of sanitary sewage is big It is big to increase.Especially on remote suburban area, rural area, Scenic Spot Area and other places, due to people life style and infrastructure The reasons such as construction, sanitary sewage is just directly discharged into environment without any process, water environment is polluted by different degrees of, this Not only persecute living environment, threaten peasant it is healthy, also contribute to the security of drinking water.Therefore, it is badly in need of strengthening opposite The process of sewage living, especially low ratio of carbon to ammonium sanitary sewage (C/N=5:1~11:1) people's living environment, is improved, so that it is guaranteed that The safety of drinking water and the people's is healthy.
Underground sewage percolating system can make full use of the natural environment of locality, the process local life suited measures to local conditions Sewage, has the advantages that good removal effect, reduced investment, energy consumption are low, does not produce stink, has no effect on ground landscape, and management is simple, Engineering is simple, and climate affects little.But underground sewage percolating system has that easily blocking, nitrogen removal rate are low, Ke Yitong Crossing its bio-matrix that is modified improves the problem for existing, while improving the treatment effeciency to low ratio of carbon to ammonium sanitary sewage.
At present filling substrate used by underground sewage percolating system is generally soil, sand, slag etc..Filling substrate used should With preferable crumb structure and stability so as to obtain appropriate infiltration rate and Wicking action intensity;Improve carrier The permeability of specific surface area and improvement system, for microorganism good carrier and growing environment is provided, and is processed so as to improve system Efficiency and avoid system jams.
The content of the invention
The present invention provides a kind of underground sewage percolating system for processing low ratio of carbon to ammonium sanitary sewage, by modification biological matrix With microbial immobilized reinforcing, it is high for the various contaminant removal efficiencies in low ratio of carbon to ammonium sanitary sewage, while ensureing sewage Subsurface wastewater infiltration system runs steadily in the long term.
Technical scheme is as follows:
A kind of underground sewage percolating system for processing low ratio of carbon to ammonium sanitary sewage, including housing, plant, modification biological matrix Layer a, gravel layer a, modification biological hypothallus b, gravel layer b, water feed apparatus and discharging device;The plant, modification biological matrix Layer a, gravel layer a, modification biological hypothallus b and gravel layer b are arranged on from top to down in the housing, and the water feed apparatus are arranged In the gravel layer a, the discharging device is arranged in the gravel layer b;The bottom of the housing arranges cylinder apopore, The discharging device is connected with the cylinder apopore.
The underground sewage percolating system of described process low ratio of carbon to ammonium sanitary sewage, its preferred version is that the housing is high For 120-200cm, diameter 10-40cm.
The underground sewage percolating system of described process low ratio of carbon to ammonium sanitary sewage, its preferred version is that the water inlet is filled Put including water inlet pipe and cross water distributor a, link together in the middle part of the water inlet pipe and cross water distributor a;Described ten Four mouths of pipe of font water distributor a are closed state, and apopore, the apopore are opened up at the top of the cross water distributor a Aperture is 3mm.
The underground sewage percolating system of described process low ratio of carbon to ammonium sanitary sewage, its preferred version is, the plant species In being implanted in the modification biological hypothallus a, the plant is grass kitten grass.
The underground sewage percolating system of described process low ratio of carbon to ammonium sanitary sewage, its preferred version is, the modified life Thing hypothallus a is located at the 0-60cm from top to down of the housing and locates, and the modification biological hypothallus b is positioned at the housing from upper And at lower 66-170cm;The modification biological hypothallus a and modification biological hypothallus b is by soil, sial system porous material, discarded Steel cuttings and high-efficient denitrification and dephosphorization bacterium are well mixed are formulated in mass ratio, and mass ratio is as follows:Soil 70-85%, sial system Porous material 4-8%, discards steel cuttings 8-15%, high-efficient denitrification and dephosphorization bacterium 10-18%.
The underground sewage percolating system of described process low ratio of carbon to ammonium sanitary sewage, its preferred version is that the soil is Soddy soil, Jing natural air dryings remove root system of plant, gravel, 100 mesh sieves are crossed after grinding and is obtained.
The underground sewage percolating system of described process low ratio of carbon to ammonium sanitary sewage, its preferred version is, the sial system Its mineral phase composition of porous material includes quartz, mullite and rutile;Its chemical composition is SiO2、Al2O3、Fe2O3、K2O and Impurity, SiO2Account for 56.78wt%, Al2O3Account for 37.11wt%, K2O accounts for 2.78wt%, Fe2O31.58wt% is accounted for, impurity is accounted for 1.75wt%;Its duct size is 30~1000 μm, and porosity is 30~90%, and particle diameter is 5-10mm;Sial system porous Material is synthesized by two kinds of natural clay CN-01 and CN-02;Quartz content accounts for 15.4% in the CN-01, and potassium feldspar accounts for 1.3%, Muscovite accounts for 28.1%, and kaolinite accounts for 55.2%;Quartz content accounts for 10.4% in the CN-02, and potassium feldspar accounts for 0.6%, white clouds Mother accounts for 16.9%, and kaolinite accounts for 72.1%;The CN-01 is with CN-02 grain diameters below 200 mesh;SiO in the CN-012 Account for 56.18wt%, Al2O326.80wt% is accounted for, bright alkali accounts for 8.70wt%, K2O accounts for 3.39wt%, Fe2O3Account for 2.63wt%, impurity Account for 0.3wt%;SiO in the CN-022Account for 52.42wt%, Al2O331.98wt% is accounted for, bright alkali accounts for 10.90wt%, Fe2O3Account for 1.36wt%, K2O accounts for 2.04wt%, and impurity accounts for 1.3wt%.
The underground sewage percolating system of described process low ratio of carbon to ammonium sanitary sewage, its preferred version is, described efficiently de- Nitrogen includes Acidovorax sp., Lysinibacillus fusiformis, Burkholderia cepacia except phosphobacteria group、Lysinibacillus sphaericus group、Bacillus pumilus group、Bacillus Subtilis group, Agrococcus sp., Pseudomonas sp. (i.e. pseudomonas) and/or Flavobacterium (i.e. Flavobacterium), is that denitrification microorganism Jing low temperature and low ratio of carbon to ammonium tame to be formed low temperature resistant and be adapted to low The efficient denitrification microorganism of carbon-nitrogen ratio sanitary sewage.
The underground sewage percolating system of described process low ratio of carbon to ammonium sanitary sewage, its preferred version is, the gravel layer a It is made up of for 10-50mm gravels particle diameter with gravel layer b, thickness is 10-16cm.
The underground sewage percolating system of described process low ratio of carbon to ammonium sanitary sewage, its preferred version is that the water outlet is filled Be set to cross water distributor b, three mouths of pipe of the cross water distributor b are closed state, a unlimited mouth of pipe with it is described Cylinder apopore is connected;The bottom of the cross water distributor b opens up inlet opening, and the inlet opening aperture is 3mm.
It is 150-750mg/L that the pollutant index of described low ratio of carbon to ammonium sanitary sewage is COD contents, and ammonia-nitrogen content is 30-300mg/L, total nitrogen content is 40-350mg/L, and phosphorus content is 5-13mg/L.
Beneficial effects of the present invention are:
1st, microbial immobilization technology can make microorganism in the middle of sial system porous material structural void in the present invention Growth, so as to be fixed.Microorganism Jing after immobilization can preferably play sustaining degradation function, improve underground sewage percolating The treatment effect of system;Simultaneously sial system porous material shields to microorganism, can avoid the loss of course of reaction, increases Plus stability, technological process is simplified, while can also long-term batch operation.
2nd, the present invention is by sial system porous material, discarded steel cuttings and the modified underground sewage percolating of high-efficient denitrification and dephosphorization bacterium The bio-matrix of system, can improve the permeability of underground sewage percolating system, and can provide for high-efficient denitrification and dephosphorization bacterium Attachment carrier, strengthens its immobilization effect, so as to promote the absorption to nitrate nitrogen, the removal effect of enhanced sewage total nitrogen, and has Effect improves the easy blockage problem of underground sewage percolating system, increases the service life;Can well transport in northern Cold Winter simultaneously OK.
3rd, the water outlet of the underground sewage percolating system meets《Urban wastewater treatment firm pollutant emission standard》 (GB18918-2002) one-level A standard in:COD contents are 20-50mg/L, and ammonia-nitrogen content is 1-8mg/L, and total nitrogen content is 8- 15mg/L, phosphorus content is 0-0.5mg/L.
Description of the drawings
Fig. 1 is the underground sewage percolating system structure diagram for processing low ratio of carbon to ammonium sanitary sewage;
Fig. 2 is water feed apparatus schematic diagram;
Fig. 3 is discharging device schematic diagram.
Specific embodiment
Embodiment 1
As shown in Figures 1 to 3, a kind of underground sewage percolating system for processing low ratio of carbon to ammonium sanitary sewage, including housing 1, plant Thing 2, modification biological hypothallus a3, gravel layer a4, modification biological hypothallus b5, gravel layer b6, water feed apparatus and discharging device;Institute State plant 2, modification biological hypothallus a3, gravel layer a4, modification biological hypothallus b5 and gravel layer b6 and be arranged on institute from top to down In stating housing 1;The bottom of the housing 1 arranges cylinder apopore 7.
The housing 1 a height of 180cm, diameter 30cm.The plant 2 is grass kitten grass, is planted in described changing In property bio-matrix layer a3.Modification biological hypothallus a3 is located at the 0-55cm of housing 1, and gravel layer a4 is located at the 55- of housing 1 65cm, modification biological hypothallus b5 are located at the 65-168cm of housing 1, and gravel layer b6 is located at the 168-180cm of housing 1.
Modification biological hypothallus a3 and modification biological hypothallus b5 by soddy soil, sial system porous material, discarded steel cuttings and High-efficient denitrification and dephosphorization bacterium is well mixed is formulated in mass ratio, and mass ratio is as follows:Soddy soil 70%, sial system porous material 7%, discard steel cuttings 10%, high-efficient denitrification and dephosphorization bacterium 13%;Wherein the particle diameter of sial system porous material is 5-10mm;It is wherein high Proportioning is in effect denitrogenation dephosphorizing bacterium:Acidovorax7%, Lysinibacillus fusiformis4%, other bacteriums 2%;Other bacteriums include Burkholderia cepacia group, Lysinibacillus sphaericus group, Bacillus pumilus group、Bacillus subtilis group、Agrococcus sp.、Pseudomonas sp. And/or Flavobacterium, the mass ratio of these bacteriums is identical.
Gravel layer a4 and gravel layer b6 is made up of particle diameter for 10-15mm gravels.The water feed apparatus are arranged on the gravel In layer a4, the discharging device is arranged in the gravel layer b6;The water feed apparatus include water inlet pipe 8 and cross water distributor A9, links together in the middle part of the water inlet pipe 8 and cross water distributor a9;Four mouths of pipe of the cross water distributor a9 are Closed state, the bottom of the cross water distributor a9 opens up apopore 10, and the aperture of the apopore 10 is 3mm;The water outlet Device is cross water distributor b11, and three mouths of pipe of the cross water distributor b11 are closed state, a unlimited mouth of pipe It is connected with the cylinder apopore 7;The bottom of the cross water distributor b11 opens up inlet opening 12, the hole of the inlet opening 12 Footpath is 3mm.
City domestic sewage pollutant index is:COD contents are 450mg/L, and ammonia-nitrogen content is 183mg/L, total nitrogen content For 200mg/L, phosphorus content is 11mg/L.
Water feed apparatus described in low ratio of carbon to ammonium sanitary sewage Jing are entered into underground sewage percolating system, and a portion is in hair Move upwards under thin power effect, through the process of modification biological hypothallus a3, for grass kitten grass water source is provided;It is another Part is processed under gravity into modification biological hypothallus b5, and the water after process is discharged by discharging device.
COD contents in underground sewage percolating system water outlet are 35mg/L, and ammonia-nitrogen content is 2mg/L, and total nitrogen content is 9mg/L, phosphorus content is 0.5mg/L.
Embodiment 2
Difference from Example 1 is that modification biological hypothallus a3 is located at the 0-52cm of housing 1, gravel layer a4 positions At the 52-70cm of housing 1, modification biological hypothallus b5 is located at the 70-169cm of housing 1, gravel layer b6 is located at housing 1 At 169-180cm.Modification biological hypothallus a3 and modification biological hypothallus b5 mass ratioes are as follows:Soddy soil 70%, sial system is more Porous materials 5%, discard steel cuttings 11%, high-efficient denitrification and dephosphorization bacterium 14%;Proportioning is in high-efficient denitrification and dephosphorization bacterium: Acidovorax8%, Lysinibacillus fusiformis5%, other bacteriums 1%.
Winter domestic sewage in rural areas its COD content in city is 600mg/L, and ammonia-nitrogen content is 190mg/L, and total nitrogen content is 212mg/L, phosphorus content is 14mg/L.
COD contents in underground sewage percolating system water outlet are 37mg/L, and ammonia-nitrogen content is 5mg/L, and total nitrogen content is 13mg/L, phosphorus content is 0.4mg/L.
Embodiment 3
Difference from Example 1 is that modification biological hypothallus a3 is located at the 0-50cm of housing 1, gravel layer a4 positions At the 50-66cm of housing 1, modification biological hypothallus b5 is located at the 66-165cm of housing 1, gravel layer b6 is located at housing 1 At 165-180cm.Modification biological hypothallus a3 and modification biological hypothallus b5 mass ratioes are as follows:Soddy soil 72%, sial system is more Porous materials 4%, discard steel cuttings 8%, high-efficient denitrification and dephosphorization bacterium 16%;Proportioning is in high-efficient denitrification and dephosphorization bacterium: Acidovorax9%, Lysinibacillus fusiformis6%, other bacteriums 1%.
Its COD content of north of china in winter domestic sewage in rural areas is 150-400mg/L, and ammonia-nitrogen content is 30-50mg/L, and total nitrogen contains Measure as 30-50mg/L, phosphorus content is 5-11mg/L.
COD contents in underground sewage percolating system water outlet are 30-50mg/L, and ammonia-nitrogen content is 1-4mg/L, total nitrogen content For 5-13mg/L, phosphorus content is 0-0.3mg/L;After operation 60 days, more than 85%, ammonia nitrogen removal frank exists the clearance of COD The clearance of more than 95%, TN is in 85~96%, TP clearances more than 99.9%.
Embodiment 4
Difference from Example 1 is that modification biological hypothallus a3 is located at the 0-60cm of housing 1, gravel layer a4 positions At the 60-75cm of housing 1, modification biological hypothallus b5 is located at the 75-164cm of housing 1, gravel layer b6 is located at housing 1 At 164-180cm.Modification biological hypothallus a3 and modification biological hypothallus b5 mass ratioes are as follows:Soddy soil 75%, sial system is more Porous materials 4%, discard steel cuttings 9%, high-efficient denitrification and dephosphorization bacterium 12%;Proportioning is in high-efficient denitrification and dephosphorization bacterium: Acidovorax7%, Lysinibacillus fusiformis4%, other bacteriums 1%.
Town domestic sewage includes that toilet hygiene waste water and kitchen are washed the dishes waste water, and COD contents are 350mg/L, ammonia-nitrogen content For 80mg/L, total nitrogen content is 97mg/L, and phosphorus content is 15mg/L.
COD contents in underground sewage percolating system water outlet are 24mg/L, and ammonia-nitrogen content is 3.5mg/L, and total nitrogen content is 12mg/L, phosphorus is not detected.
Embodiment 4
Difference from Example 1 is that modification biological hypothallus a3 is located at the 0-62cm of housing 1, gravel layer a4 positions At the 62-74cm of housing 1, modification biological hypothallus b5 is located at the 74-166cm of housing 1, gravel layer b6 is located at housing 1 At 166-180cm.Modification biological hypothallus a3 and modification biological hypothallus b5 mass ratioes are as follows:Soddy soil 78%, sial system is more Porous materials 4%, discard steel cuttings 8%, high-efficient denitrification and dephosphorization bacterium 10%;Proportioning is in high-efficient denitrification and dephosphorization bacterium: Acidovorax4%, Lysinibacillus fusiformis4%, other bacteriums 2%.
Cities and towns winter life dirt COD contents are 390mg/L, and ammonia-nitrogen content is 108mg/L, and total nitrogen content is 120mg/L, phosphorus Content 16mg/L.
COD contents in underground sewage percolating system water outlet are 30mg/L, and ammonia-nitrogen content is 4mg/L, and total nitrogen content is 13mg/L, phosphorus content is 0.1mg/L.

Claims (10)

1. it is a kind of process low ratio of carbon to ammonium sanitary sewage underground sewage percolating system, it is characterised in that including housing, plant, change Property bio-matrix layer a, gravel layer a, modification biological hypothallus b, gravel layer b, water feed apparatus and discharging device;The plant, change Property bio-matrix layer a, gravel layer a, modification biological hypothallus b and gravel layer b are arranged on from top to down in the housing, it is described enter Water installations are arranged in the gravel layer a, and the discharging device is arranged in the gravel layer b;The bottom of the housing is arranged Cylinder apopore, the discharging device is connected with the cylinder apopore.
2. it is according to claim 1 process low ratio of carbon to ammonium sanitary sewage underground sewage percolating system, it is characterised in that institute State a height of 120-200cm of housing, diameter 10-40cm.
3. it is according to claim 1 process low ratio of carbon to ammonium sanitary sewage underground sewage percolating system, it is characterised in that institute Water feed apparatus are stated including water inlet pipe and cross water distributor a, in the middle part of the water inlet pipe and cross water distributor a one is connected to Rise;Four mouths of pipe of the cross water distributor a are closed state, open up apopore at the top of the cross water distributor a, institute Apopore aperture is stated for 3mm.
4. it is according to claim 1 process low ratio of carbon to ammonium sanitary sewage underground sewage percolating system, it is characterised in that institute Planting is stated in the modification biological hypothallus a, the plant is grass kitten grass.
5. it is according to claim 1 process low ratio of carbon to ammonium sanitary sewage underground sewage percolating system, it is characterised in that institute Modification biological hypothallus a is stated at the 0-60cm from top to down of the housing, the modification biological hypothallus b is located at the shell At the 66-170cm from top to down of body;The modification biological hypothallus a and modification biological hypothallus b is by soil, sial system porous Material, discarded steel cuttings and high-efficient denitrification and dephosphorization bacterium are well mixed are formulated in mass ratio, and mass ratio is as follows:Soil 70- 85%, sial system porous material 4-8%, discard steel cuttings 8-15%, high-efficient denitrification and dephosphorization bacterium 10-18%.
6. it is according to claim 5 process low ratio of carbon to ammonium sanitary sewage underground sewage percolating system, it is characterised in that institute It is soddy soil to state soil, and Jing natural air dryings remove root system of plant, gravel, 100 mesh sieves are crossed after grinding and is obtained.
7. it is according to claim 5 process low ratio of carbon to ammonium sanitary sewage underground sewage percolating system, it is characterised in that institute Its mineral phase composition of sial system porous material is stated including quartz, mullite and rutile;Its chemical composition is SiO2、Al2O3、 Fe2O3、K2O and impurity, SiO2Account for 56.78wt%, Al2O3Account for 37.11wt%, K2O accounts for 2.78wt%, Fe2O3Account for 1.58wt%, Impurity accounts for 1.75wt%;Its duct size is 30~1000 μm, and porosity is 30~90%, and particle diameter is 5-10mm;The sial It is that porous material is synthesized by two kinds of natural clay CN-01 and CN-02;Quartz content accounts for 15.4% in the CN-01, and potassium feldspar is accounted for 1.3%, muscovite accounts for 28.1%, and kaolinite accounts for 55.2%;Quartz content accounts for 10.4% in the CN-02, and potassium feldspar is accounted for 0.6%, muscovite accounts for 16.9%, and kaolinite accounts for 72.1%;The CN-01 is with CN-02 grain diameters below 200 mesh;It is described SiO in CN-012Account for 56.18wt%, Al2O326.80wt% is accounted for, bright alkali accounts for 8.70wt%, K2O accounts for 3.39wt%, Fe2O3Account for 2.63wt%, impurity accounts for 0.3wt%;SiO in the CN-022Account for 52.42wt%, Al2O331.98wt% is accounted for, bright alkali is accounted for 10.90wt%, Fe2O3Account for 1.36wt%, K2O accounts for 2.04wt%, and impurity accounts for 1.3wt%.
8. it is according to claim 5 process low ratio of carbon to ammonium sanitary sewage underground sewage percolating system, it is characterised in that institute High-efficient denitrification and dephosphorization bacterium is stated including Acidovorax sp., Lysinibacillus fusiformis, Burkholderia cepacia group、Lysinibacillus sphaericus group、Bacillus pumilus group、Bacillus Subtilis group, Agrococcus sp., Pseudomonas sp. and/or Flavobacterium, are denitrification microorganism Jing low temperature and low ratio of carbon to ammonium tame to form efficient denitrification microorganism that is low temperature resistant and adapting to low ratio of carbon to ammonium sanitary sewage.
9. it is according to claim 1 process low ratio of carbon to ammonium sanitary sewage underground sewage percolating system, it is characterised in that institute State gravel layer a and gravel layer b to be made up of for 10-50mm gravels particle diameter, thickness is 10-16cm.
10. it is according to claim 1 process low ratio of carbon to ammonium sanitary sewage underground sewage percolating system, it is characterised in that The discharging device is cross water distributor b, and three mouths of pipe of the cross water distributor b are closed state, and one unlimited The mouth of pipe is connected with the cylinder apopore;The bottom of the cross water distributor b opens up inlet opening, and the inlet opening aperture is 3mm。
CN201710058738.7A 2017-01-23 2017-01-23 A kind of underground sewage percolating system handling low ratio of carbon to ammonium sanitary sewage Active CN106630170B (en)

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