CN101607775A - Earthworm and ecological filter-denitrification bio-filter combined system is handled organic sewage technology - Google Patents

Earthworm and ecological filter-denitrification bio-filter combined system is handled organic sewage technology Download PDF

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Publication number
CN101607775A
CN101607775A CNA2009100321232A CN200910032123A CN101607775A CN 101607775 A CN101607775 A CN 101607775A CN A2009100321232 A CNA2009100321232 A CN A2009100321232A CN 200910032123 A CN200910032123 A CN 200910032123A CN 101607775 A CN101607775 A CN 101607775A
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China
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filter
earthworm
sewage
ecological
denitrification bio
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CNA2009100321232A
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Chinese (zh)
Inventor
郑正
方彩霞
伦琳
邹星星
陈广银
张继彪
郭飞宏
罗兴章
王卫平
汪龙眠
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Nanjing University
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Nanjing University
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Publication of CN101607775A publication Critical patent/CN101607775A/en
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    • Y02E50/343—

Abstract

The invention discloses a kind of earthworm and ecological filter-denitrification bio-filter combined system and handle organic sewage technology, earlier organic sewage is carried out solid-liquid separation, sewage after the separation enters equalizing tank and regulates mixing, sewage after the adjusting is sprinkled upon the earthworm and ecological filter top layer by water distributor, through the water outlet after the earthworm and ecological filter processing, enter denitrification bio-filter behind the adjusting C/N and handle, the denitrification bio-filter water outlet reaches the first discharge standard of GB8978-1996.The present invention is directed to the deficiency that single tower earthworm ecological filter tank and denitrification bio-filter exist aspect the organic sewage removal, the combined treatment mode that adopts " ecology " and " biology " to combine, tower earthworm ecological filter tank and two kinds of sewage treatment process of DNBF are combined, a kind of organic sewage treatment process reasonable, that processing efficiency is high and working cost is low that makes up is provided, water outlet can be stablized the first discharge standard that reaches GB8978-1996, and can be applicable to agricultural irrigation, landscape water.Whole process has realized ecology, low cost and non-secondary pollution, and can realize the requirement of recycling.

Description

Earthworm and ecological filter-denitrification bio-filter combined system is handled organic sewage technology
Technical field
The invention belongs to field of environment protection, be specifically related to a kind of tower earthworm ecological filter tank-denitrification bio-filter combined system and handle organic sewage technology.
Background technology
Along with the fast development of economic society, the water of China pollutes and has expanded vast rural area from the city to, and pollution of area source is serious day by day.Domestic sewage in rural areas by using is the important component part of pollution of area source, because the hysteresis that sewage treatment facility is built, there is not treated sanitary sewage directly to enter irrigation canals and ditches, river in a large number, finally enter receiving water bodies such as lake, aggravated the pollution of water surrounding, particularly being rich in nitrogen phosphorus in the domestic sewage in rural areas by using, is the major reason that causes body eutrophication.Therefore in order to realize the effective control to pollution of area source, it is extremely urgent that domestic sewage in rural areas by using is carried out collection and treatment.
It is numerous that domestic sewage in rural areas by using is administered technology both at home and abroad, but nearly all adopt bioremediation, the characteristics interwovenesses that the method energy consumption is low, efficient is higher such as this relative physics with biological method, chemistry.The main treatment technology and the technology of sanitary sewage have both at home and abroad: 1. efficient algae pool treatment technology comprises the aerobic pool, facultative lagoon, anaerobic pond, hydrobiont oxidation pond and aeration lagoon etc.2. the soil is treated to main technology, comprises slow rate, diafiltration fast, overland flow, artificial swamp and subsurface infiltration etc.3. anaerobism-oxygen of holding concurrently is unpowered/dynamic country sewage treatment technology, based on anaerobic digestion process, utilize means such as microbial film, biological filter hold concurrently oxygen, aerobic decomposition, be aided with bio-oxidation pond and do advanced treatment, handle domestic sewage in rural areas by using by the form of multistage gravity flow, staging treating, degraded step by step.4. combination process treatment technology, single treatment process is difficult to satisfy emission request usually, the combined treatment mode that adopts " biology " and " ecology " to combine, can reach higher removal effect, formation has the domestic sewage in rural areas by using treatment technology approach of significant advantage, so combination process more and more comes into one's own.
The tower earthworm ecological filter tank of Nanjing University's independent research is a kind of sewage disposal technology efficiently, effect with good removal suspended substance, organism, ammonia nitrogen and total phosphorus, this technology has also that investment is low, technology is simple, easy to operate, characteristics such as floor space is little, maintenance and low, the no excess sludge generation of working cost in addition, but, there is NO because hydraulic detention time is shorter 3 --N and NO 2 -The phenomenon of-N accumulation.Denitrification bio-filter (DNBF) is the sewage treatment process that integrates biological degradation, solid-liquid separation, it is efficient, low consumption, biomass is big and characteristics such as the advantage that possesses skills aspect denitrification make DNBF be promoted rapidly in the advanced treatment of wastewater field, but it exists the water inlet concentration of suspension is had relatively high expectations, easily stopped up and shortcoming such as the cycle of operation is short.
Summary of the invention
The objective of the invention is at single tower earthworm ecological filter tank and denitrification bio-filter in the deficiency that exists aspect the sewage removal, tower earthworm ecological filter tank and two kinds of sewage treatment process of DNBF are combined, a kind of organic sewage treatment process reasonable, that treatment effect is good, energy consumption is low and working cost is low that makes up is provided.
Purpose of the present invention can reach by following measure:
A kind of earthworm and ecological filter-denitrification bio-filter combined system is handled organic sewage technology, earlier organic sewage is carried out solid-liquid separation, sewage after the separation enters equalizing tank and regulates mixing, sewage is regulated the back and is sprinkled upon the earthworm and ecological filter top layer by water distributor, handling the back water outlet through earthworm and ecological filter, enter denitrification bio-filter (DNBF) behind the water outlet adjusting C/N and handle, the denitrification bio-filter water outlet reaches the first discharge standard of GB8978-1996.Water distributor can adopt rotary water distributor, sewage can be sprinkled upon the earthworm and ecological filter top layer equably like this.Sewage in the earthworm and ecological filter can be removed SS in the waste water, COD, NH under the synergy of earthworm, microorganism and plant 4 +-N and TP; Denitrification bio-filter can be strengthened removal NO wherein 3 --N and NO 2 --N etc.Final outflow water can be applicable to agricultural irrigation, landscape water etc.
Wherein earthworm and ecological filter is a tower earthworm ecological filter tank; Denitrification bio-filter is the oxygen-starved biological filter; Organic sewage is sanitary sewage, breeding wastewater, butcher in sewage, beer beverage sewage and the food-processing sewage one or more.
The present invention at first carries out solid-liquid separation with organic sewage, and the sewage after the solid-liquid separation and other sewage can directly enter earthworm and ecological filter by water distributor, also can enter equalizing tank earlier together, and the sewage after regulating pumps into tower earthworm ecological filter tank.Earthworm and ecological filter has the ecological functions such as decomposition and inversion that improve soil aeration water permeability and promotion organic substance according to earthworm and designs, and is similar to vertical current constructed wetland and soil and oozes treatment system soon.Earthworm and ecological filter generally is made up of 3 tower layers, i.e. three-stage tower type earthworm and ecological filter, and each tower layer filler configuration basically identical is filled pebbles, broken green stone, fine sand and artificial soil successively to the top from the bottom; Particle diameter 25mm～40mm pebbles wherein, 8cm～10cm; The broken green stone of particle diameter 5mm～20mm, 15cm～20cm; Particle diameter 0mm～2mm fine sand, 15cm～20cm; 30cm～50cm artificial soil layer; Each grade tower layer height is 50cm～120cm.The earthworm of adopting is big flat No. 2, mainly lives in pedosphere, and the inoculum density of earthworm in soil is 4g～15g/L.Be furnished with uniform posticum below the first step and the second stage tower layer, between the posticum of one-level tower layer and the second stage tower laminar surface and the space of 20～30cm all arranged between the posticum of secondary tower layer and the third stage tower laminar surface, can guarantee that so whole tower type filter chamber has the working cycle of twice above aerobic-anaerobism-interlayer drippage oxygenation, makes the processing efficiency of sewage significantly improve.The hydraulic detention time of sewage in tower earthworm ecological filter tank is 0.5～4 hour, and hydraulic load is controlled at 0.2～1.4m 3/ (m 2D), psychrometric ratio is 3: 1, to COD, NH 4 +-N, TP and SS clearance are respectively more than 85%, 95%, 98% and 90%.
After three grades of earthworm and ecological filters are handled, NO 3 --N and NO 2 -The phenomenon of part accumulation appears in-N, and organism has almost been degraded fully, three grades of average C/N ratios of water outlet are 0.65～0.89, desire to carry out advanced treatment, need in three grades of water outlets, to add carbon source and regulate the C/N ratio, generally transferred to 4: 1～10: 1, carbon source can adopt glucose, sodium acetate or methyl alcohol, and best C/N was than 7: 1～10: 1 when being additional carbon with glucose.
Three grades of water outlets behind the adjusting C/N ratio, SS concentration is lower, the DNBF characteristics higher have been satisfied to the SS concentration requirement, thereby shortcoming such as can alleviate that DNBF easily stops up, head loss is big and the cycle of operation is short, prolong its cycle of operation, reduce the back flushing number of times, DNBF can effectively remove the NO in the earthworm and ecological filter water outlet simultaneously 3 --N and NO 2 --N.This DNBF is processed by circular synthetic glass post, water intake mode is a upflowing, the bottom in filter tank is provided with fluid inlet, be followed successively by water distribution perforation plate, supporting layer, back flushing aeration tube and biologic packing material layer on the fluid inlet, the top is provided with water outlet and overflow port, and three grades of water outlets of tower earthworm ecological filter tank are connected by the fluid inlet of pipeline with the DNBF bottom.The filler of biologic packing material layer is a biological ceramic particle, quartz sand, zeolite, gac, polystyrene, polyvinyl chloride or polypropylene etc.
The hydraulic detention time of sewage in DNBF is 8h～14h, and hydraulic load is 1.5～2.8m 3/ (m 2D), filtering velocity is 10m/h～18m/h.After DNBF handles, TN, NO 3 --N and NO 2 -All more than 88%, stable water outlet reaches first discharge standard to-N clearance.
This technology needs regularly denitrification bio-filter to be carried out back flushing, enters tower earthworm ecological filter tank after backwashing water flows out from denitrification bio-filter after former water (sewage after the solid-liquid separation) mixing and handles.
Earthworm and ecological filter adopts the alternation of wetting and drying mode to move, and psychrometric ratio is 3: 1; Denitrification bio-filter is operation continuously.
The combined treatment mode that process using of the present invention " ecology " and " biology " combine, two kinds of sewage water treatment methods are organically combined, provide a kind of earthworm and ecological filter-denitrification bio-filter combined system to handle the technology of organic sewage, can effectively handle organic sewage, tower earthworm ecological filter tank is used to remove the most of pollutent of sewage, as COD, NH 4 +-N, TP and SS etc., denitrification bio-filter then is used for removing the NO of sewage 3 --N and NO 2 -N works in coordination with the best effect advantage of not only having brought into play every kind of treatment process mutually between the two, but also has overcome both shortcomings, has reached the purpose of high-level efficiency sewage disposal.This art breading effluent quality can be stablized the first discharge standard that reaches GB8978-1996, and can be applicable to agricultural irrigation, landscape water.Whole process has realized ecology, low cost and non-secondary pollution, and can realize the requirement of recycling.
Description of drawings
Fig. 1 is that tower earthworm ecological filter tank of the present invention-denitrification bio-filter combined system is handled the organic sewage process flow sheet.
Embodiment
Embodiment 1: the domestic sewage processing system that the day output in Taihu Lake basin village is 20t
Various sewage such as man of peasant household septic tank supernatant liquor, the surplus waste water in kitchen, laundrywastes and bath wastewater are collected the back solid-liquid separation by pipeline, sewage enters equalizing tank and regulates mixing, sewage after the adjusting is sprinkled upon the earthworm and ecological filter top layer by water distributor, enter tower earthworm ecological filter tank and handle, hydraulic load is controlled at 0.25m 3/ (m 2D), psychrometric ratio 3: 1, through behind the tower earthworm ecological filter tank 2h to COD, NH in the sewage 4 +-N, TP and SS clearance are respectively 92%, 99%, 99% and 96%.It is 8: 1 that three grades of filter tank effluent adopting glucose are regulated the C/N ratio, enters the DNBF filter tank from the bottom, is filtrate with the biological ceramic particle, and hydraulic load is controlled at 1.7m 3/ (m 2D), hydraulic detention time is controlled at 8h, and filtering velocity is controlled at 12m/h, DNBF section TN and NO 3 --N clearance is respectively 94% and 98%, and the DNBF water outlet can reach national sewage comprehensive emission standard (GB8978-1996) primary standard.
Embodiment 2: the Process for Treatment of Swine Wastewater system that certain day output of small-sized plant is 80t
Certain plant adopts dried wet separated and collected mode to clean the pig farm, and the waste water of discharging is mainly urinated from the flushing waste water and the pig of pig house.The waste water of each pig house flow to septic tank by irrigation canals and ditches, and the septic tank supernatant liquor pumps into equalizing tank and regulates mixing, and water outlet is sprinkled upon the earthworm and ecological filter top layer by water distributor, enters tower earthworm ecological filter tank and handles.Hydraulic load is controlled at 1m 3/ (m 2D), through behind the tower earthworm ecological filter tank 4h to COD, NH in the sewage 4 +-N, TP and SS clearance are respectively 85%, 92%, 95% and 90%.It is 5: 1 that three grades of filter tank effluent adopting methyl alcohol are regulated the C/N ratio, enters the DNBF filter tank from the bottom, is filtrate with the zeolite, and hydraulic load is controlled at 4.2m 3/ (m 2D), hydraulic detention time is controlled at 10h, and filtering velocity is controlled at 10m/h, DNBF section TN and NO 3 --N clearance is respectively 87% and 88%.
The equipment that adopts among the embodiment:
The three-stage tower type earthworm and ecological filter: be made up of 3 tower layers, each tower layer filler configuration basically identical is filled successively from the bottom to the top: particle diameter 25mm～40mm pebbles, 8cm～10cm; The broken green stone of particle diameter 5mm～20mm, 15cm～20cm; Particle diameter 0mm～2mm fine sand, 15cm～20cm; 30cm～50cm artificial soil layer.The earthworm of adopting is big flat No. 2, mainly lives in pedosphere, and the inoculum density of earthworm in soil is 4g～15g/L.Be furnished with uniform posticum below the first step and the second stage tower layer, between the posticum of one-level tower layer and the second stage tower laminar surface and the space of 20～30cm all arranged between the posticum of secondary tower layer and the third stage tower laminar surface.
Denitrification bio-filter: process by circular synthetic glass post, water intake mode is a upflowing, the bottom in filter tank is provided with fluid inlet, be followed successively by water distribution perforation plate, supporting layer, back flushing aeration tube and biologic packing material layer on the fluid inlet, the top is provided with water outlet and overflow port, and three grades of water outlets of tower earthworm ecological filter tank are connected by the fluid inlet of pipeline with the DNBF bottom.The filler of biologic packing material layer is a filtrate.

Claims (10)

1, a kind of earthworm and ecological filter-denitrification bio-filter combined system is handled organic sewage technology, it is characterized in that earlier organic sewage being carried out solid-liquid separation, sewage after the separation enters equalizing tank and regulates mixing, sewage is regulated the back and is sprinkled upon the earthworm and ecological filter top layer by water distributor, handling the back water outlet through earthworm and ecological filter, enter denitrification bio-filter behind the water outlet adjusting C/N and handle, the denitrification bio-filter water outlet reaches the first discharge standard of GB8978-1996.
2, earthworm and ecological filter according to claim 1-denitrification bio-filter combined system is handled organic sewage technology, it is characterized in that described organic sewage is selected from sanitary sewage, breeding wastewater, butchers sewage, in beer beverage sewage or the food-processing sewage one or more.
3, earthworm and ecological filter according to claim 1-denitrification bio-filter combined system is handled organic sewage technology, it is characterized in that described earthworm and ecological filter is a tower earthworm ecological filter tank.
4, earthworm and ecological filter according to claim 3-denitrification bio-filter combined system is handled organic sewage technology, it is characterized in that described earthworm and ecological filter is the three-stage tower type earthworm and ecological filter, the filler of every grade of tower earthworm ecological filter tank is wherein filled pebbles, broken green stone, fine sand and artificial soil successively to the top from the bottom; Each grade tower layer height is 50cm～120cm.
5, handle organic sewage technology according to claim 1,3 or 4 described earthworm and ecological filters-denitrification bio-filter combined system, it is characterized in that earthworm and ecological filter adopts the alternation of wetting and drying mode to move, water distribution is finished by rotary water distributor, the residence time of sewage in earthworm and ecological filter is 0.5h～4h, and the hydraulic load of tower earthworm ecological filter tank is 0.2～1.4m 3/ (m 2D), psychrometric ratio is 3: 1.
6, earthworm and ecological filter according to claim 1-denitrification bio-filter combined system is handled organic sewage technology, it is characterized in that earthworm and ecological filter water outlet adjusting C/N to 4: 1～10: 1, the adjusting carbon source that C/N adopted is selected from one or more in methyl alcohol, glucose or the sodium acetate.
7, earthworm and ecological filter according to claim 1-denitrification bio-filter combined system is handled organic sewage technology, it is characterized in that described denitrification bio-filter is upflowing anoxic biological filter, the bottom in filter tank is provided with fluid inlet, be followed successively by water distribution perforation plate, supporting layer, back flushing aeration tube and biologic packing material layer on the fluid inlet, the top is provided with water outlet and overflow port, and the water outlet of tower earthworm ecological filter tank is connected by the fluid inlet of pipeline with the denitrification bio-filter bottom.
8, earthworm and ecological filter according to claim 7-denitrification bio-filter combined system is handled organic sewage technology, it is characterized in that the filler in the described biologic packing material layer is biological ceramic particle, quartz sand, zeolite, gac, polystyrene, polyvinyl chloride or polypropylene.
9, handle organic sewage technology according to claim 1 or 7 described earthworm and ecological filters-denitrification bio-filter combined system, it is characterized in that denitrification bio-filter adopts continuously-running duty, the residence time of sewage in denitrification bio-filter is 8h～14h, and the hydraulic load of denitrification bio-filter is 1.5～2.8m 3/ (m 2D), filtering velocity is 10m/h～18m/h.
10, earthworm and ecological filter according to claim 1-denitrification bio-filter combined system is handled organic sewage technology, it is characterized in that regularly denitrification bio-filter being carried out back flushing, enter tower earthworm ecological filter tank after the sewage after backwashing water flows out from denitrification bio-filter after solid-liquid separation mixes and handle again.
CNA2009100321232A 2009-07-09 2009-07-09 Earthworm and ecological filter-denitrification bio-filter combined system is handled organic sewage technology Pending CN101607775A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101948219A (en) * 2010-09-09 2011-01-19 桂林理工大学 Low-consumption biological treatment method of rural sewage
CN102249483A (en) * 2011-05-16 2011-11-23 南京大学 Method for treating industrial waste water by using CASS (cyclic activated sludge system) process and tower earthworm ecological filter
CN113185068A (en) * 2021-06-10 2021-07-30 桂林理工大学 Combined type organic wastewater treatment system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101948219A (en) * 2010-09-09 2011-01-19 桂林理工大学 Low-consumption biological treatment method of rural sewage
CN101948219B (en) * 2010-09-09 2012-10-03 桂林理工大学 Low-consumption biological treatment method of rural sewage
CN102249483A (en) * 2011-05-16 2011-11-23 南京大学 Method for treating industrial waste water by using CASS (cyclic activated sludge system) process and tower earthworm ecological filter
CN113185068A (en) * 2021-06-10 2021-07-30 桂林理工大学 Combined type organic wastewater treatment system

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Open date: 20091223