CN102503050B - Artificial composite soil layer treatment system capable of reinforcing removal of endocrine disruptors - Google Patents
Artificial composite soil layer treatment system capable of reinforcing removal of endocrine disruptors Download PDFInfo
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Abstract
The invention discloses an artificial composite soil layer treatment system capable of reinforcing the removal of endocrine disruptors. The system comprises three layers from top to bottom, namely a degradation layer, an adsorption layer and a filtering and bearing layer in turn, wherein the filling medium of the degradation layer is natural soil, artificially improved soil or the permeable soil obtained by mixing soil and river sand so that the aerobic degradation of endocrine disruptors can be reinforced; the medium of the adsorption layer is a large particle size hard adsorption material with good adsorbability to endocrine disruptors so that endocrine disruptors and other pollutants in the leachate can be further removed through adsorption; and the medium of the filtering and bearing layer is coarse gravels and pebbles which are used to support the upper filling medium and filter fine particle pollutants. The system can be used to remove more than 85% of endocrine disruptors; and the system has higher hydraulic load and lower site requirement and is suitable for the advanced treatment of the slightly polluted water body or the pretreatment process of the groundwater recharge of the regenerated water.
Description
Technical field
The present invention relates to a kind of polluted water land treatment system, be particularly related to and strengthen the artificial composite earth layer treatment system that endocrine disrupter is removed, be applicable to the advanced treatment of micropollutant water or as the pre-treating technology of reuse water groundwater recharge, belong to field of environment engineering technology.
Background technology
China is the country of a serious water shortage, and shortage of water resources has become one of important factor of restriction society and economy coordinated development.Reuse of wastewater is the effective way that solves the shortage of water resources problem, also is the powerful guarantee that satisfies the great demand of national water resources sustainable use.But owing to have diversified toxic substance and pathogenic micro-organism in the sewage, it can not be ignored the threat that the reuse water safe utilization brings.Wherein, environment incretion interferent (EDCs) is a kind of emerging Micropollutants, becomes in recent years research forward position and the focus in water surrounding field.
Endocrine disrupter refer to can by disturb synthetic, the secretion that keeps Equilibrium in biology or the human body and regulate the growth course natural hormone, transportation, in conjunction with, reaction and metabolism etc., thereby the xenobiotics that the function of reproduction, nerve and the immunity system etc. of biology or human body is exerted an influence.EDCs has following four characteristics:. concentration is lower in environment; Structure is more stable; Has the internal secretion interference; Low concentration can produce larger harm.EDCs comprises natural and the multiple compounds such as estrogens, induced by alkyl hydroxybenzene, phthalate and polychlorinated biphenyl (PCBs) synthetic, and wherein estrogens and induced by alkyl hydroxybenzene are two the highest class EDCs of ecological risk in sewage or the reuse water.Main estrogens EDCs has oestrone (E1), estradiol (E2), trihydroxy-oestrin (E3) and ethinylestradiol (EE2) in the urban wastewater treatment firm water outlet, and induced by alkyl hydroxybenzene EDCs has nonyl phenol (NP), octyl phenol (OP) and dihydroxyphenyl propane (BPA).Estradiol (E2) equivalent concentration of the multiplex estrogen activity of its internal secretion interference characterizes.
Land treatment system is a kind of sewage water treatment method based on the natural, ecological principle, by take soil as main medium and the effects such as the physics between the pollutent, chemistry, biology reach the purpose of purification of water quality.Take endocrine disrupter as example, because most of EDCs polarity are weak, hydrophobicity is stronger, have higher native water partition coefficient, its main removal mechanisms at work in land treatment system is adsorption and biological degradation (especially take aerobic degradation as main).
It is few that land treatment technique has initial cost, and treatment effect is good, and working cost is low, the advantage of simple and convenient management, thereby developed rapidly.Artificial composite earth layer belongs to a kind of of soil processing.Traditional land treatment system has following 3 deficiencies at present:
1. existing land treatment system is mainly paid close attention to the conventional contamination indexs such as COD, BOD, SS, nitrogen, phosphorus, and the technique that, harm large endocrine disrupter low for concentration strengthened removal still is in space state.
2. there are the shortcomings such as hydraulic load is low, floor space large, easy obstruction in existing land treatment system, and its key constraints is the diafiltration of soil media.
3. existing land treatment system for processing filtration media, has specific requirement to factors such as the topographic and geologic in place, soil and groundwater buried depths mainly with natural land, and these factors have limited the application of land treatment technique greatly.
Summary of the invention
For the deficiency that above-mentioned prior art exists, the object of the present invention is to provide a kind of artificial composite earth layer treatment system that endocrine disrupter is removed of strengthening, have processing efficiency height, floor space is little, site requirements is low characteristics.
For achieving the above object, the present invention is by the following technical solutions:
Strengthen the artificial composite earth layer treatment system that endocrine disrupter is removed, comprise 3 layers, be respectively degraded layer 2, adsorption layer 3 from top to bottom and filter supporting layer 4;
Described degraded layer 2 filled medias are the natural soils that are rich in microorganism, good penetrability, i.e. the natural soils of organic content＞15g/kg, total plate count＞107CFU/g, infiltration rate＞0.5m/d; Or add the artificial modified soil of carbon source or nitrogenous source or endocrine disrupter efficient degrading bacteria, wherein carbon source refers to the mixture of glucose, maltose, ight soil or three's arbitrary proportion, nitrogenous source refers to the mixture of urea, ammonium salt, amino acid or three's arbitrary proportion, and the dosage of carbon source, nitrogenous source is 0～10% of soil dry weight; Or soil and river sand are by weight 1～5: the 1 ventilation property soil that is mixed to get.
Described adsorption layer 3 filled medias are Endocrine chaff interference absorption property, and good particle diameter is that 0.2～2mm, Mohs' hardness are 3.5～7 sorbing material, comprises one or more in zeolite, haydite and the perlite, and ratio is any during several mixing.
Described filtration supporting layer 4 filled medias are coarse gravel or cobble, are divided into three gratings: little 0.2～2cm, in 2～5cm, large 5～8cm; During laying, from top to bottom, the volume ratio of three gratings is 1: 2～4: 8～12 from small to large.
Described degraded layer 2, adsorption layer 3, filtration supporting layer 4 thickness are respectively 30～70cm, 50～100cm and 30～70cm.
Described degraded layer 2 bottoms or middle unsaturated zone or the aerating apparatus of adding.
Described filtration supporting layer 4 bottoms are provided with one with the loading plate of permeable hole, perhaps lay and ooze water shoot.
Compared to existing technology, the invention has the beneficial effects as follows:
1. the native system effluent quality is good, and strengthen the removal of endocrine disrupter, to mainly the clearance of endocrine disrupter is more than 85% in sewage or the reuse water water, the comprehensive measurement index of Endocrine interference---the centinormal 1 clearance of estradiol is 85%～90%.
2. the hydraulic load of native system is compared traditional land treatment system 100～200L/m such as hollow billet soaking method
2The treatment capacity of d exceeds 3～10 times, processes the land area minimizing 65%～90% that the identical water yield need take.Because degraded layer thickness of soil less, artificial-strengthening biological degradation, thereby alleviated blockage problem.
3. low to site requirements, applied widely.Native system degraded layer soil consumption less, kind can be chosen flexibly; Adsorption layer filled media wide material sources and cheap have increased the use range of native system greatly.
Description of drawings
Fig. 1 is the structural representation of artificial composite earth layer of the present invention.
Fig. 2 is the structural representation of embodiments of the invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further details.
Referring to Fig. 1, Fig. 2, strengthen the artificial composite earth layer treatment system that endocrine disrupter is removed, comprise 3 layers, be respectively degraded layer 2, adsorption layer 3 from top to bottom and filter supporting layer 4, degraded layer 2 functions are held back suspended particle simultaneously for strengthening the aerobic degradation of endocrine disrupter; Adsorption layer 3 functions are other pollutents in further Adsorption endocrine disrupter and the upper strata percolate; Filter the function of supporting layer 4 and be the filled media on support top, and filter the fine particle pollutent in the percolate.
Described degraded layer 2 filled medias are the natural soils that are rich in microorganism, good penetrability, i.e. the natural soils of organic content＞15g/kg, total plate count＞107CFU/g, infiltration rate＞0.5m/d; Or add the artificial modified soil of carbon source or nitrogenous source or endocrine disrupter efficient degrading bacteria, wherein carbon source refers to the mixture of glucose, maltose, ight soil or three's arbitrary proportion, nitrogenous source refers to the mixture of urea, ammonium salt, amino acid or three's arbitrary proportion, and the dosage of carbon source, nitrogenous source is 0～10% of soil dry weight; Or soil and river sand are by weight 1～5: the 1 ventilation property soil that is mixed to get.
Described adsorption layer 3 filled medias are Endocrine chaff interference absorption property, and good particle diameter is that 0.2～2mm, Mohs' hardness are 3.5～7 sorbing material, comprises one or more in zeolite, haydite and the perlite, and ratio is any during several mixing.
Described filtration supporting layer 4 filled medias are coarse gravel or cobble, are divided into three gratings: little 0.2～2cm, in 2～5cm, large 5～8cm; During laying, the volume ratio of three gratings is 1: 2～4: 8～12 from small to large.
Described degraded layer 2, adsorption layer 3, filtration supporting layer 4 thickness are respectively 30～70cm, 50～100cm and 30～70cm.
Described degraded layer 2 bottoms or middle unsaturated zone or the aerating apparatus of adding.
Described filtration supporting layer 4 bottoms are provided with one with the loading plate of permeable hole, perhaps lay and ooze water shoot.
Concrete grammar is: on the vertical direction of artificial composite earth layer, be provided with leachate collection monitoring device 5 and monitoring mouth 7 along journey, leachate collection monitoring device 5 is used for enrichment along the journey percolate, to test wherein concentration and the activity of the endocrine disrupter of trace, monitoring mouth 7 is for conventional indexs such as temperature of monitoring soil layer, soil water potentials.
Pending sewage or reuse water are delivered to artificial composite earth layer top by sump pump 8, are evenly distributed to the degraded layer top by water distributor 10, form sewage layer 1, exceed the water inlet that designs top water-level and are discharged by overflow port 6.
The porous loading plate of the water purification that artificial composite earth layer oozes out through filter supporting layer bottom forms the charge for remittance layer and extracted out by clarified water pump 9 below soil layer, perhaps water outlet directly enters and oozes water shoot by clarified water pump 9 extractions.
When moving, the present invention can adopt dual mode: the one, to basin irrigation and the dried mode that hockets that falls, and wet-dry ratio gets 1: 2～4, namely basins irrigation operation 1 day, and dried the stopping that fall stopped 2～4 days, and the cycle of operation is 3～5 days; The 2nd, continuous operation is namely decided continuously head and is basined irrigation, and require degraded layer 2 to set up unsaturated zone or aerating apparatus this moment.
Need monitoring the rate of output water and effluent quality in the operational process of the present invention, when infiltration rate during less than 0.1m/d, suitably remove degraded layer top layer 1～5cm, be replaced by new soil, 1 year 3～5 times; When sharply worsening, water quality checks whether adsorption layer is saturated, if then change the adsorption layer filler.
Embodiment analyzes
Degraded layer 2 filled medias of artificial composite earth layer be pick up from Watershed, Daxing County, Beijing City soil farmland, be rich in organic matter, content of microorganisms is high, the natural topsoil of endocrine disrupter good degrading effect, filling thickness is 50cm, the filling unit dry weight is 1.35g/cm
3It is the zeolite of 1～2mm that the adsorption layer filled media adopts particle diameter, and filling thickness is 50cm, and the filling unit dry weight is 1.21g/cm
3The supporting layer filled media is coarse gravel or cobble, is divided into three gratings: little 0.2～2cm, in 2～5cm, large 5～8cm, volume ratio is 1: 3: 10 from small to large, filling thickness is 30cm.
Take the reuse water of Beijing sewage work as for trying the water the source, COD concentration is 11～15mg/L, SS＜5mg/L, total nitrogen 12～18mg/L, total phosphorus 0.1～0.2mg/L.Operation scheme is to basin irrigation and the dried mode that hockets that falls, and wet-dry ratio was got 1: 2, namely basins irrigation operation 1 day, and dried the stopping that fall stopped 2 days, and the cycle of operation is 3 days.
The artificial composite earth layer treatment system of present embodiment, as shown in table 1 to the removal effect of water inlet total organic carbon (TOC) and main endocrine disrupter and estrogen activity.
The artificial composite earth layer treatment system Inlet and outlet water water quality of table 1
As can be seen from Table 1, TOC of yielding water is down to below the 7.5mg/L, and the clearance of main endocrine disrupter is 87%～100%, and estrogen activity reduces by 89%, and the toxicity of endocrine disrupter in the water and ecological risk are reduced greatly.This shows that this artificial composite earth layer treatment system not only can remove conventional organic pollutant, and the endocrine disrupter of trace in the water is had strong removal ability.
Above embodiment only in order to embodiment of the present invention to be described, does not limit practical range of the present invention.Allly do not depart from equivalent variations and the modification that claim of the present invention is done, must belong to protection scope of the present invention.
Claims (4)
1. strengthen the artificial composite earth layer treatment system that endocrine disrupter is removed, it is characterized in that, comprise 3 layers, be respectively degraded layer (2), adsorption layer (3) from top to bottom and filter supporting layer (4);
Described degraded layer (2) filled media is the natural soils that are rich in microorganism, good penetrability, i.e. organic content〉15g/kg, total plate count〉10
7CFU/g, infiltration rate〉natural soils of 0.5m/d; Or add the artificial modified soil of carbon source or nitrogenous source or endocrine disrupter efficient degrading bacteria, wherein carbon source refers to the mixture of glucose, maltose, ight soil or three's arbitrary proportion, nitrogenous source refers to the mixture of urea, ammonium salt, amino acid or three's arbitrary proportion, and the dosage of carbon source, nitrogenous source is 0～10% of soil dry weight; Or the ventilation property soil that is mixed to get by weight 1～5:1 of soil and river sand;
Described adsorption layer (3) filled media is Endocrine chaff interference absorption property, and good particle diameter is that 0.2～2mm, Mohs' hardness are 3.5～7 sorbing material, comprises one or more in zeolite, haydite and the perlite, and ratio is any during several mixing;
Described filtration supporting layer (4) filled media is coarse gravel or cobble, is divided into three gratings: little 0.2～2cm, in 2～5cm, large 5～8cm; During laying, from top to bottom, the volume ratio of three gratings is 1:2～4:8～12 from small to large.
2. the artificial composite earth layer treatment system removed of reinforcement endocrine disrupter according to claim 1, it is characterized in that described degraded layer (2), adsorption layer (3) and filtration supporting layer (4) thickness are respectively 30～70cm, 50～100cm and 30～70cm.
3. the artificial composite earth layer treatment system of reinforcement endocrine disrupter removal according to claim 1 is characterized in that, described degraded layer (2) bottom or middle unsaturated zone or the aerating apparatus of adding.
4. the artificial composite earth layer treatment system of reinforcement endocrine disrupter removal according to claim 1 is characterized in that, described filtration supporting layer (4) bottom is provided with one with the loading plate of permeable hole, perhaps lays and oozes water shoot.
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| CN105130115A (en) * | 2015-08-27 | 2015-12-09 | 清华大学 | Treatment system and method and experimental apparatus for removing BPA from water by high hydraulic load |
| CN105130112A (en) * | 2015-08-27 | 2015-12-09 | 清华大学 | Composite soil layer system, method and experimental apparatus for removing typical endocrine disruptors from water |
| CN105692914B (en) * | 2016-01-21 | 2018-06-29 | 山东建筑大学 | A kind of biological delaying basin using high-performance bio membrane removal petroleum pollution |
| CN110282818A (en) * | 2019-06-18 | 2019-09-27 | 苏州金螳螂园林绿化景观有限公司 | Rainwater storage and pollutant purification system |
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