CN103214150A

CN103214150A - Complete self-backflow well type anabroeic-anoxic-oxic (AAO) sewage treatment method

Info

Publication number: CN103214150A
Application number: CN2013101521552A
Authority: CN
Inventors: 张庆军; 张学洪; 徐铭泽; 游少鸿; 林华; 刘杰; 李艳红; 唐沈
Original assignee: Guilin University of Technology
Current assignee: Guilin University of Technology
Priority date: 2013-04-27
Filing date: 2013-04-27
Publication date: 2013-07-24
Anticipated expiration: 2033-04-27
Also published as: CN103214150B

Abstract

The invention discloses a complete self-backflow well type anabroeic-anoxic-oxic (AAO) sewage treatment method. A sewage treatment device is provided, wherein the sewage treatment device comprises a well body and a secondary sedimentation tank; the well body comprises a well cylinder and a reciprocal aeration system; the outer wall of the well cylinder is an impervious wall; the interior of the well cylinder is divided into two sides by using an isolation plate; one side is an anaerobic zone; a water intake tube is arranged at the top part of the anaerobic zone; the bottom part of the well cylinder is a middle sedimentation zone with a gravity sludge discharge tube; the reciprocal aeration system is arranged on the other side of the well cylinder; the reciprocal aeration system comprises an upward aeration head, a downward aeration head and an aeration device; the reciprocal aeration system is divided into an anoxic zone and an oxic zone taking the upward aeration head as the boundary; the secondary sedimentation tank, a sludge backrflow hole and a water outlet are arranged at the periphery of the upper part of the well cylinder; an overflow dam and a water collection tank are arranged at the periphery of the secondary sedimentation tank; a water outtake tube is arranged at the bottom of the water collection tank; a sludge discharge tube is arranged at the bottom of the secondary sedimentation tank; sewage raw water is supplied through the water intake tube, sequentially passes through the anaerobic zone, the anoxic zone and the oxic zone, and further enters the secondary sedimentation tank. Through a series of physical and chemical action, the sewage is treated. The method disclosed by the invention has the advantages of efficiency, environment friendliness, energy conservation and low cost.

Description

A kind of fully from refluxing well formula AAO sewage water treatment method

Technical field

The invention belongs to technical field of sewage, particularly a kind of fully from the well formula AAO that refluxes (abbreviation of English first letter of Anaerobic-Anoxic-Oxic, i.e. anaerobic-anoxic-aerobic) sewage water treatment method.

Background technology

At present, sewage treatment facility construction operation cost height, saving energy and reduce the cost to become the problem that the industry letter need solve.

Integral type novel energy-conserving water treatment method is subjected to the industry extensive concern, and effectively be applied in the actual production, characteristics such as well formula AAO technology construction operation convenience, energy-saving and environmental protection, free from extraneous odour, water-fast power are strong are in the urban life district, manufacturing district and the being subjected to factory of taking up an area of restriction shows higher superiority on a large scale.

Aerobic treatment and anaerobic/anoxic technology is combined, can improve system loading, make organic matter degradation more thorough, improve effluent quality; People such as Del Pozo R have invented fixedly film integrated reactor of a kind of anaerobic-aerobic, the closure of five aerating apparatuss that are provided with by control is determined the volume ratio of anaerobism and aerobic zone, the aeration zone of transition can realize the subregion with the anaerobic and aerobic district, and has been successfully applied to Treatment of Wastewater from Animal Slaughtering; Domestic integrated bioreactor present stage also just develops towards direction aerobic, the optimum combination of anaerobic/anoxic kinds of processes; The AmOn integrated bioreactor of people such as the Zhang Yalei of Tongji University research and development by, integrating reaction, precipitation and mud refluxes, by anaerobism and the regulation and control of anoxybiotic Suresh Kumar, characteristics such as the alternately operation flexibly of realization anaerobism anoxybiotic has reached the activated sludge concentration height, and the anti impulsion load ability is strong, the treatment of Organic Wastewater that can be fit to different influent qualities, and, realize denitrogenation preferably and phosphor-removing effect, and be successfully applied to the processing of dyeing waste water by regulating aeration rate and stirring extent.

But, existing integral treatment method still is in the research initial stage, the experience of traditional technology long-time running practice accumulation is very little to the reference of novel process, multinomial operating parameter stability remains the textual criticism of long-term practice, there is not clear and definite subregion simultaneously, phosphor-removing effect is relatively poor, has very big limitation for polymer organic waste water and different properties wastewater treatment, does not have to realize from stable transition of traditional technology and directly applies to the assurance of actual production.

Summary of the invention

The objective of the invention is to overcome present integral process poor stability, practical application has restricted and synchronous denitrification dephosphorizing and handle the shortcoming of polymer organic waste water preferably, provide a kind of, reach the effect of energy-conservation synchronous nitration denitrification denitrogenation dephosphorization, processing polymer organic waste water and other different properties waste water fully from refluxing well formula AAO sewage water treatment method.

Concrete steps are:

(1) a kind of well formula AAO waste disposal plant that refluxes fully certainly is set, comprises well body and secondary sedimentation basins; The well body comprises pit shaft and reciprocal aerating system, and the pit shaft outer wall is a cut-pff wall, and the pit shaft internal space is divided into the both sides that space proportion is 1:4 with dividing plate, space proportion is that a side of 1 is an anaerobic zone, water inlet pipe is established at the anaerobic zone top, and wellbore bottom is the intermediate sedimentation district, and the intermediate sedimentation district is provided with the gravity shore pipe; Space proportion is that a side of 4 is installed reciprocal aerating system, and reciprocal aerating system comprises upwards aeration head, aeration head and aerating apparatus downwards, and upwards the following part of aeration head is the oxygen-starved area, and upwards the above part of aeration head is an aerobic zone; Anaerobic zone: oxygen-starved area: the volume ratio of aerobic zone is 1:1:3; The upper wellbore periphery is provided with secondary sedimentation basins, secondary sedimentation basins and anaerobic zone zone of action are provided with the mud return port, secondary sedimentation basins and aerobic zone zone of action are provided with posticum, the secondary sedimentation basins periphery is provided with water leg, between secondary sedimentation basins and water leg overfalling weir is set, the water leg bottom sets out water pipe, and the secondary sedimentation basins bottom is provided with shore pipe.

(2) the former water of sewage enters anaerobic zone by water inlet pipe, organic absorption of dilution, active sludge and denitrifying carbon source consumption through anaerobic zone, the total organic carbon of the former water of sewage (TOC) reaches higher clearance at anaerobic zone, alleviates NO in follow-up denitrification-nitrification simultaneously ₂The accumulation of-N has improved biodegradability.

(3) the sewage mixed solution after step (2) anaerobic treatment through the intermediate sedimentation district of wellbore bottom successively by oxygen-starved area and aerobic zone, upwards aeration head carries out reciprocal aeration with downward aeration head in aerobic zone, the sewage mixed solution is oxygenation and blending takes place in aerobic zone under the aeration effect, the poly-hydroxy fatty acid of storing in the polyP bacteria decomposer in the aerobic zone (PHA) releases energy, and the dissolved phosphorus in the absorption surrounding environment, the sewage mixed solution that refluxes from aerobic zone is finished denitrification in the oxygen-starved area simultaneously, be the amphimicrobian denitrifying bacteria under anaerobic environment with nitrate as electron acceptor(EA), in excessive suction phosphorus, realize denitrification denitrogenation, and then the intensified denitrification and dephosphorization effect, and further remove total organic carbon (TOC) in the sewage mixed solution; Described upwards aeration head and downward aeration head can carry out tolerance respectively to be regulated, and then the size of control mixed-liquor return amount.

(4) enter secondary sedimentation basins through step (3) anoxic and aerobic reacted sewage mixed solution by posticum, after in secondary sedimentation basins, finishing mud-water separation, mud is heavier, part mud is pressed into anaerobic zone through the mud return port, enter the intermediate sedimentation district again, and then the backflow certainly of realization mud, the mud in the intermediate sedimentation district is discharged through the gravity shore pipe under action of gravity; Excess sludge is discharged through shore pipe in the heavy pond of secondary, and the water after the processing enters water leg through overfalling weir, finally discharges by rising pipe, promptly realizes the backflow certainly of mixed solution and mud, and finishes sewage disposal.

The advantage of the inventive method is:

(1) device of present method use is the improvement of carrying out on stable AAO technology experiential basis, stronger theoretical basis is arranged, simple structure, be convenient to construction maintenance, can successfully use and engineering practice, and simplified the facility that mixed-liquor return and mud reflux, greatly reduced capital construction and running cost.

(2) method of the present invention is on the empirical basis of stable traditional technology, stable makes the transition to energy-conserving and environment-protective, effectively denitrogenation dephosphorizing also can be handled high concentrated organic wastewater and other different properties waste water, take up an area of minimum, and realize that mixed solution is from refluxing, save the main power consumption link in the traditional technology, really reached environmental protection, energy-conservation, water treatment effect efficiently.

Description of drawings

Fig. 1 is an apparatus structure synoptic diagram used herein.

Be labeled as among the figure: the 1-water inlet pipe; The 2-anaerobic zone; The 3-dividing plate; The 4-cut-pff wall; 5-intermediate sedimentation district; 6-gravity shore pipe; The 7-oxygen-starved area; The 8-aeration head that makes progress; The 9-aerobic zone; The downward aeration head of 10-; The 11-aerating apparatus; The 12-posticum; The 13-secondary sedimentation basins; 14-mud return port; The 15-overfalling weir; The 16-water leg; The 17-rising pipe; The 18-shore pipe.

Fig. 2 is the sewage disposal schema of the embodiment of the invention.

Embodiment

Embodiment:

In the present embodiment the former water of the sewage that uses for artificial preparation simulation high-concentration waste water, use NaHCO ₃The pH value that configuration waste water is controlled at is controlled between 7.5 ~ 8.5, and temperature is controlled at 25 ℃, and water inlet TOC (total organic carbon) is 1000 mg/litre, and TN (total nitrogen) is 40 mg/litre, and TP (total phosphorus) is 6 mg/litre.

(1) a kind of well formula AAO waste disposal plant that refluxes fully certainly is set, comprises well body and secondary sedimentation basins 13; The well body comprises pit shaft and reciprocal aerating system, the pit shaft outer wall is a cut-pff wall 4, the pit shaft internal space is divided into the both sides that space proportion is 1:4 with dividing plate 3, space proportion is that a side of 1 is an anaerobic zone 2, water inlet pipe 1 is established at anaerobic zone 2 tops, wellbore bottom is intermediate sedimentation district 5, and intermediate sedimentation district 5 is provided with gravity shore pipe 6; Space proportion is that a side of 4 is installed reciprocal aerating system, and reciprocal aerating system comprises upwards aeration head 8, aeration head 10 and aerating apparatus 11 downwards, and upwards the part of aeration head 8 below is oxygen-starved area 7, and the part of aeration head more than 8 that make progress is aerobic zone 9; Anaerobic zone 2: oxygen-starved area 7: the volume ratio of aerobic zone 9 is 1:1:3; The upper wellbore periphery is provided with secondary sedimentation basins 13, secondary sedimentation basins 13 is provided with mud return port 14 with the zone of action of anaerobic zone 2, secondary sedimentation basins 13 is provided with posticum 12 with the zone of action of aerobic zone 9, secondary sedimentation basins 13 peripheries are provided with

water leg

16,16 of secondary sedimentation basins 13 and water legs are provided with overfalling weir 15, water leg 16 bottoms set out water pipe 17, and secondary sedimentation basins 13 bottoms are provided with shore pipe 18.

(2) the former water of sewage enters anaerobic zone 2 by water inlet pipe 1, organic absorption of dilution, active sludge and denitrifying carbon source consumption through anaerobic zone 2, the total organic carbon of the former water of sewage (TOC) reaches higher clearance at anaerobic zone 2, alleviates NO in follow-up denitrification-nitrification simultaneously ₂The accumulation of-N has improved biodegradability.

(3) the sewage mixed solution after step (2) anaerobic treatment passes through oxygen-starved area 7 and aerobic zone 9 successively through the intermediate sedimentation district 5 of wellbore bottom, upwards aeration head 8 carries out reciprocal aeration with downward aeration head 10 in aerobic zone 9, the sewage mixed solution is in oxygenation and blending takes place in aerobic zone 9 under the aeration effect, the poly-hydroxy fatty acid of storing in the polyP bacteria decomposer in the aerobic zone 9 (PHA) releases energy, and the dissolved phosphorus in the absorption surrounding environment, the sewage mixed solution that refluxes from aerobic zone 9 is finished denitrification in the oxygen-starved area simultaneously, be the amphimicrobian denitrifying bacteria under anaerobic environment with nitrate as electron acceptor(EA), in excessive suction phosphorus, realize denitrification denitrogenation, and then the intensified denitrification and dephosphorization effect, and further remove total organic carbon (TOC) in the sewage mixed solution; Described upwards aeration head 8 and downward aeration head 10 can carry out tolerance respectively to be regulated, and then the size of control mixed-liquor return amount.

(4) enter secondary sedimentation basins 13 through step (3) anoxic and aerobic reacted sewage mixed solution by posticum 12, after in secondary sedimentation basins 13, finishing mud-water separation, mud is heavier, part mud is pressed into anaerobic zone 2 through mud return port 14, enter intermediate sedimentation district 5 again, and then the backflow certainly of realization mud, the mud in the intermediate sedimentation district 5 is discharged through gravity shore pipe 6 under action of gravity; Excess sludge is discharged through shore pipe 18 in the heavy pond of secondary, and the water after the processing enters water leg 16 through overfalling weir 15, finally discharges by rising pipe 17, promptly realizes the backflow certainly of mixed solution and mud, and finishes sewage disposal.

In the present embodiment, hydraulic detention time (HRT) is 10 hours, dissolved oxygen (DO) is controlled at 3.5ppm, return current ratio of the mixed liquid 300%, return sludge ratio 100%, mixed solution sludge concentration (MLSS) is in 3500 mg/litre, TOC of yielding water, TN and TP can reach 22.6 mg/litre, 6.9 mg/litre and 0.46 mg/litre, average removal rate is respectively 87.7%, 82.8%, 92.3%, water outlet all can be satisfied " urban wastewater treatment firm pollutant emission standard " primary standard in (GB18918-2002), has higher water treatment efficiency.

Claims

1. sewage water treatment method is characterized in that concrete steps are:

(1) a kind of waste disposal plant is set, comprises well body and secondary sedimentation basins; The well body comprises pit shaft and reciprocal aerating system, and the pit shaft outer wall is a cut-pff wall, and the pit shaft internal space is divided into the both sides that space proportion is 1:4 with dividing plate, space proportion is that a side of 1 is an anaerobic zone, water inlet pipe is established at the anaerobic zone top, and wellbore bottom is the intermediate sedimentation district, and the intermediate sedimentation district is provided with the gravity shore pipe; Space proportion is that a side of 4 is installed reciprocal aerating system, and reciprocal aerating system comprises upwards aeration head, aeration head and aerating apparatus downwards, and upwards the following part of aeration head is the oxygen-starved area, and upwards the above part of aeration head is an aerobic zone; Anaerobic zone: oxygen-starved area: the volume ratio of aerobic zone is 1:1:3; The upper wellbore periphery is provided with secondary sedimentation basins, secondary sedimentation basins and anaerobic zone zone of action are provided with the mud return port, secondary sedimentation basins and aerobic zone zone of action are provided with posticum, the secondary sedimentation basins periphery is provided with water leg, between secondary sedimentation basins and water leg overfalling weir is set, the water leg bottom sets out water pipe, and the secondary sedimentation basins bottom is provided with shore pipe;

(2) the former water of sewage enters anaerobic zone by water inlet pipe, organic absorption of dilution, active sludge and denitrifying carbon source consumption through anaerobic zone, the total organic carbon of the former water of sewage is that TOC reaches higher clearance at anaerobic zone, alleviates NO in follow-up denitrification-nitrification simultaneously ₂The accumulation of-N has improved biodegradability;

(3) the sewage mixed solution after step (2) anaerobic treatment through the intermediate sedimentation district of wellbore bottom successively by oxygen-starved area and aerobic zone, upwards aeration head carries out reciprocal aeration with downward aeration head in aerobic zone, the sewage mixed solution is oxygenation and blending takes place in aerobic zone under the aeration effect, the poly-hydroxy fatty acid of storing in the polyP bacteria decomposer in the aerobic zone is that PHA releases energy, and the dissolved phosphorus in the absorption surrounding environment, the sewage mixed solution that refluxes from aerobic zone is finished denitrification in the oxygen-starved area simultaneously, be the amphimicrobian denitrifying bacteria under anaerobic environment with nitrate as electron acceptor(EA), in excessive suction phosphorus, realize denitrification denitrogenation, and then the intensified denitrification and dephosphorization effect, and further remove TOC in the sewage mixed solution; Described upwards aeration head and downward aeration head can carry out tolerance respectively to be regulated, and then the size of control mixed-liquor return amount;