CN103819000B - AO/SBR system and process for enhanced nitrogen removal - Google Patents

AO/SBR system and process for enhanced nitrogen removal Download PDF

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CN103819000B
CN103819000B CN201410067104.4A CN201410067104A CN103819000B CN 103819000 B CN103819000 B CN 103819000B CN 201410067104 A CN201410067104 A CN 201410067104A CN 103819000 B CN103819000 B CN 103819000B
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water
oxygen
sludge
starved area
aerobic zone
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CN103819000A (en
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张岩岗
安东子
柳倩倩
张玥
寇彦德
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Beijing Shougang International Engineering Technology Co Ltd
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Beijing Shougang International Engineering Technology Co Ltd
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Abstract

The invention provides an AO/SBR system and process for enhanced nitrogen removal, belonging to the technical field of simultaneous phosphorus and nitrogen removal by using SBR and derivative processes thereof. The system comprises an anoxic zone in which a constant water level is set, a submersible mixer is additionally arranged and an anoxic filling material is added, an aerobic zone in which an aerobic filling material zone is arranged and an aerobic filling material is added, a reinforced sludge backflow system and an improved automatic control system, The process has the advantages of good anti-load capacity, simple operation, a high degree of automation, discharge of a small amount of sludge, simultaneous nitration, denitrification and nitrogen removal effects, low possibility of sludge bulking and the like, is applicable to upgrading and rebuilding of conventional sewage treatment plants, does not increase floor space of a project and can be conveniently popularized and applied in building, upgrading and rebuilding of small and medium sized sewage treatment plants in China.

Description

A kind of AO/SBR system of strengthened denitrification process and technique
Technical field
The invention belongs to SBR(sequencing batch active sludge) and modification technique synchronous denitrification dephosphorizing technical field, the AO/SBR system of particularly a kind of strengthened denitrification process and technique (aerobic/anaerobic/sequencing batch active sludge).
Background technology
Along with the aggravation of storehouse, China lake water eutrophication degree, local sewage drainage standard has been put into effect in each province and city in succession, has higher requirement to the Tail water reuse standard of built and newly-built urban wastewater treatment firm.And the emission concentration limit value of each pollutent has exceeded the threshold concentration of body eutrophication corresponding index in " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) that State Environmental Protection Administration issues; therefore upgrading optimization is carried out to the denitride technology in process for town sewage treatment, become the key of water prevention body pollution.
Due to planning imperfection, fund input is not enough, causes China's middle or small sewage treatment to build up the water quality of rear receiving and the water yield and design load and there is certain difference, and its influent quality and the water yield obvious with seasonal variation.Flow process is simple because having for SBR technique, investment and operation energy consumption is low, flexible operation, anti-shock loading strong, can prevent the advantages such as sludge bulking, widespread use in China's middle or small sewage treatment.But SBR processing unit vacancy rate is higher, synchronous denitrification process affects by multiple factors such as dissolved oxygen, carbon source, biological floe sizes, causes being difficult to ensure to the removal effect of total nitrogen.Therefore, find a kind of applicable middle-size and small-size sewage treatment process, the water pollution of control China is significant.
Summary of the invention
The object of the present invention is to provide a kind of AO/SBR system and technique of strengthened denitrification process, overcome former SBR processing unit vacancy rate higher, synchronous denitrification process affects by multiple factors such as dissolved oxygen, carbon source, biological floe sizes, causes the deficiency removal effect of total nitrogen being difficult to guarantee.Anti-portative power is strong, Be very effective, transformation simple and flexible, can strengthen middle-size and small-size sewage disposal.
Bioselection and mud-water separation are combined in a pond and complete by the present invention, form a system cycle by water inlet, aeration, precipitation, draining, four operations, adopt the mode of four pond parallel combinations to make technique reach continuum micromeehanics.
The system of AO/SBR of the present invention be included in oxygen-starved area, aerobic zone, enter for controlling raw waste water oxygen-starved area water intaking valve, for aerobic zone mixing sludge being back to the sludge reflux pump of oxygen-starved area, the sludge pump being used for discharging aerobic zone excess sludge, on-line control system, online dissolved oxygen detector, online sludge concentration detector, liquidometer, motor-operated control valve etc.On-line control system controls the facilities such as intake pump, submersible agitator, sludge reflux pump (frequency conversion), sludge pump, motorized valve, air compressor, water decanter.Oxygen-starved area is provided with submersible agitator, keeps the braiding channel of the permanent water level in oxygen-starved area, connects thrust-augmenting nozzle, the anoxic filler of braiding channel and aerobic zone.Aerobic zone is provided with aerobic filler, micropore aeration pipe, sludge reflux pump and the facility such as sludge pump, water decanter.Concrete technology step is:
Raw waste water is intake bottom oxygen-starved area, permanent water level is set in oxygen-starved area and namely one-sided water inlet carbon steel braiding channel is set on effluent weir interior wall top, oxygen-starved area, diversion tunnel bottom braiding channel and effluent weir is connected by carbon steel thrust-augmenting nozzle, oxygen-starved area water is imported aerobic zone from diversion tunnel bottom effluent weir, on water-in and oxygen-starved area braiding channel, spilling water place arranges stainless steel graticule mesh, and in oxygen-starved area, arrange undercurrent agitator and anoxic filler.
The certain pond of aerobic zone apart from feed-water end side is installed with as aerobic packing area, and puts into aerobic filler within it.
Behind the aerobic packing area of aerobic zone with before water decanter, sludge reflux pump is set, mixing sludge is back to water inlet, oxygen-starved area, another offside sludge pump being arranged on sludge reflux pump, the corresponding pipeline of air compressor arranges motorized valve and regulates pressurized air surplus.
Technique of the present invention comprises the following steps:
(1) control water intaking valve 3 by automatic control system 17, treatment sewage is introduced AO/SBR technique main reaction region.The water inlet of oxygen-starved area 1 inner bottom part, sewage overflows across braiding channel and enters aerobic zone 2 by thrust-augmenting nozzle, and being refluxed in aerobic zone 2 by sludge reflux pump 10, mixing sludge is to water inlet pipe mouth place, oxygen-starved area 1, and quantity of reflux is at Q total inflowwith 2Q total inflowbetween adjustable and run continuously, open the submersible agitator 4 in oxygen-starved area 1, raw waste water flooding time is 1h simultaneously.
(2) when intaking to 0.5h, starting air compressor 14, carrying out micropore low frequency aeration by aeration tube.When after water inlet end, control aeration intensity, make the dissolved oxygen in aerobic zone 2 control at 2.0 ~ 3.0mg/L, total aeration time is 1.5h, aeration terminates rear closedown air compressor 14, opens motorized valve (pneumatic) 13, until the residue compressed gas in emptying aeration tube.
(3) precipitate phase, now air compressor 14, water decanter 15, water discharge valve 16 are all in closing condition, and sedimentation time is 1h.
(4) bleeding stage, open water decanter 15 and water discharge valve 16, carry out draining, water discharge time is 1h.
The whole AO/SBR technology controlling and process cycle is water inlet, aeration, precipitation, draining, repeats in order, and each cycle is 4h, and adopts sludge pump 11 periodic exhaustion excess sludge when each end cycle.
Principle of work of the present invention:
(1) oxygen-starved area be set as permanent water level and add anoxic filler, increasing the hydraulic detention time of oxygen-starved area, enhancing denitrification denitrogenation effect.After adding anoxic filler, enhance the activity of denitrifying bacteria, thus improve the removal effect to nitric nitrogen.
(2) aerobic filler is added in aerobic zone, suitably aeration intensity is controlled in aerobic packing area, make microorganism species be attached to filling surface and form microbial film, this microbial film top layer is aerobic zone, latent layer is aerobic area, internal layer is anaerobic zone, can synchronous nitration denitrification denitrogenation function be realized, and make mud decrement greatly.
(3) enhance aerobic zone sludge recirculation system, by aerobic zone activity sludge reflux to anoxic pond water-in, by fully mixing with raw waste water, utilizing the carbon source in raw waste water to carry out denitrification, improve nitric efficiency.
The present invention has the following advantages:
(1) capacity of resisting impact load is strong, simple to operate, level of automation is high, mud discharging is few, denitrification effect significantly, not easily sludge bulking occurs.
(2) adopt the intensified anti-nitrated denitrogenation of mixing sludge return-flow system, take full advantage of the carbon source in raw waste water, improve denitrification efficiency.
(3) compared with SBR technique, oxygen-starved area is set as permanent water level by this technique, adds anoxic filler and submersible agitator, denitrifying bacterium activity is improved, enhances anti-nitration reaction.Add aerobic filler in aerobic zone, improve synchronous nitration denitrification denitrogenation ability.
(4) this technique is applicable to existing sewage work upgrading, does not increase project occupation of land area, is convenient to apply in and upgrading project newly-built in middle or small sewage treatment.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Fig. 2 is system of the present invention and process device figure.
In figure: oxygen-starved area 1, aerobic zone 2, water intaking valve 3, submersible agitator 4, braiding channel 5, thrust-augmenting nozzle 6, anoxic packing area 7, graticule mesh 8, aerobic packing area 9, sludge reflux pump 10, sludge pump 11, aeration tube 12, motorized valve 13, air compressor 14, water decanter 15, water discharge valve 16, automatic control system 17, dissolved oxygen detector 18, sludge concentration detector 19.
Embodiment
Process unit of the present invention is as shown in Figure 2: comprise main reaction region and oxygen-starved area 1 and aerobic zone 2, raw waste water is introduced the water intaking valve 3 of oxygen-starved area 1, submersible agitator 4 in oxygen-starved area 1, braiding channel 5, thrust-augmenting nozzle 6, anoxic packing area 7, graticule mesh 8, aerobic packing area 9 in aerobic zone 2, for the mixing sludge in aerobic zone 2 being back to the sludge reflux pump (frequency conversion) 10 of oxygen-starved area 1, for discharging the sludge pump 11 of excess sludge in aerobic zone 2, aeration tube 12 bottom aerobic zone 2, connect motorized valve (pneumatic) 13 and the air compressor 14 of aeration tube 12, water decanter 15, water discharge valve 16, automatic control system 17, dissolved oxygen detector 18, sludge concentration detector 19.What be wherein connected with automatic control system 17 has intake pump 3, submersible agitator 4, sludge reflux pump 10, sludge pump 11, motorized valve 13, air compressor 14, water decanter 15, water discharge valve 16, dissolved oxygen detector 18, sludge concentration detector 19.
Concrete steps are:
(1) control water intaking valve 3 by automatic control system 17, treatment sewage is introduced AO/SBR technique main reaction region.The water inlet of oxygen-starved area 1 inner bottom part, sewage overflows across braiding channel and enters aerobic zone 2 by thrust-augmenting nozzle, and being refluxed in aerobic zone 2 by sludge reflux pump 10, mixing sludge is to water inlet pipe mouth place, oxygen-starved area 1, and quantity of reflux is at Q total inflowwith 2Q total inflowbetween adjustable and run continuously, open the submersible agitator 4 in oxygen-starved area 1, raw waste water flooding time is 1h simultaneously.
(2) when intaking to 0.5h, starting air compressor 14, carrying out micropore low frequency aeration by aeration tube.When after water inlet end, control aeration intensity, make the dissolved oxygen in aerobic zone 2 control at 2.0 ~ 3.0mg/L, total aeration time is 1.5h, aeration terminates rear closedown air compressor 14, opens motorized valve (pneumatic) 13, until the residue compressed gas in emptying aeration tube.
(3) precipitate phase, now air compressor 14, water decanter 15, water discharge valve 16 are all in closing condition, and sedimentation time is 1h.
(4) bleeding stage, open water decanter 15 and water discharge valve 16, carry out draining, water discharge time is 1h.
The whole AO/SBR technology controlling and process cycle is water inlet, aeration, precipitation, draining, repeats in order, and each cycle is 4h, and adopts sludge pump 11 periodic exhaustion excess sludge when each end cycle.

Claims (2)

1. an AO/SBR system for strengthened denitrification process, comprise oxygen-starved area, aerobic zone, enter for controlling raw waste water oxygen-starved area water intaking valve, for aerobic zone mixing sludge being back to the sludge reflux pump of oxygen-starved area, the sludge pump being used for discharging aerobic zone excess sludge, on-line control system, online dissolved oxygen detector, online sludge concentration detector, liquidometer, motor-operated control valve; On-line control system controls intake pump, submersible agitator, sludge reflux pump, sludge pump, motorized valve, air compressor, water decanter; It is characterized in that, oxygen-starved area is provided with submersible agitator, keeps the braiding channel of the permanent water level in oxygen-starved area, connects thrust-augmenting nozzle, the anoxic filler of braiding channel and aerobic zone; Aerobic zone is provided with aerobic filler, micropore aeration pipe, sludge reflux pump and sludge pump, water decanter facility; Raw waste water is intake bottom oxygen-starved area, permanent water level is set in oxygen-starved area and namely one-sided water inlet carbon steel braiding channel is set on effluent weir interior wall top, oxygen-starved area, diversion tunnel bottom braiding channel and effluent weir is connected by carbon steel thrust-augmenting nozzle, oxygen-starved area water is imported aerobic zone from diversion tunnel bottom effluent weir, on water-in and oxygen-starved area braiding channel, spilling water place arranges stainless steel graticule mesh, and in oxygen-starved area, arrange undercurrent agitator and anoxic filler;
The certain pond of aerobic zone apart from feed-water end side is installed with as aerobic packing area, and puts into aerobic filler within it;
Behind the aerobic packing area of aerobic zone with before water decanter, sludge reflux pump is set, mixing sludge is back to water inlet, oxygen-starved area, another offside sludge pump being arranged on sludge reflux pump, the corresponding pipeline of air compressor arranges motorized valve and regulates pressurized air surplus.
2. adopt an AO/SBR technique for the strengthened denitrification process of system described in claim 1, it is characterized in that, comprise the following steps:
(1) control water intaking valve (3) by automatic control system (17), treatment sewage is introduced AO/SBR technique main reaction region; Oxygen-starved area (1) inner bottom part is intake, sewage overflows across braiding channel and enters aerobic zone (2) by thrust-augmenting nozzle, by sludge reflux pump (10) backflow aerobic zone (2) interior mixing sludge to oxygen-starved area (1) water inlet pipe mouth place, quantity of reflux is at Q total inflowwith 2Q total inflowbetween can regulate and and run continuously, open the submersible agitator (4) in oxygen-starved area (1), raw waste water flooding time is 1h simultaneously;
(2) when intaking to 0.5h, starting air compressor (14), carrying out micropore low frequency aeration by aeration tube; When after water inlet end, control aeration intensity, the dissolved oxygen in aerobic zone (2) is made to control at 2.0 ~ 3.0mg/L, total aeration time is 1.5h, aeration terminates rear closedown air compressor (14), open motorized valve (13), until the residue compressed gas in emptying aeration tube;
(3) precipitate phase, now air compressor (14), water decanter (15), water discharge valve (16) are all in closing condition, and sedimentation time is 1h;
(4) bleeding stage, open water decanter (15) and water discharge valve (16), carry out draining, water discharge time is 1h.
CN201410067104.4A 2014-02-26 2014-02-26 AO/SBR system and process for enhanced nitrogen removal Active CN103819000B (en)

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CN104108794B (en) * 2014-08-11 2016-08-31 吕慧 A kind of batch-type A/O linked system wastewater treatment equipment realizing waste water short distance nitration and method
CN111115808A (en) * 2020-01-14 2020-05-08 中建环能科技股份有限公司 Sewage treatment system and method capable of cooperatively regulating and controlling reflux device and stirring device

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CN201722262U (en) * 2010-07-12 2011-01-26 山东华腾环保科技有限公司 Integration system for secondary treatment of hospital comprehensive sewage
CN203159330U (en) * 2012-10-29 2013-08-28 浦华环保有限公司 Sewage treatment system
CN203021409U (en) * 2013-01-23 2013-06-26 成都源创环保工程有限公司 Batch-type biological sewage treatment device
CN103395882A (en) * 2013-08-07 2013-11-20 上海在田环境科技有限公司 Processing method and processing apparatus of high ammonia-nitrogen wastewater

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