CN1341569A

CN1341569A - Improved oxidation channel city sewage treamtent process

Info

Publication number: CN1341569A
Application number: CN 01108880
Authority: CN
Inventors: 申纪军; 赵隽贤
Original assignee: CHONGQING KANGDA ENVIRONMENT PROTECTION Co Ltd
Current assignee: Chongqing Kangda Environmental Protection Industry (Group) Co., Ltd.
Priority date: 2001-09-21
Filing date: 2001-09-21
Publication date: 2002-03-27
Anticipated expiration: 2021-09-21
Also published as: CN1194910C

Abstract

The improved type oxidation channel urban sewage treatment process is characterized by that the detritus pool adopts eddy flow detritus pool, before the returned sludge is returned into oxidization channel, said sludge must be undergone the process of anaerobic treatment for 1-2 hr.; the design parameters of the improved oxidization channel are as follows: sludge aye is 10-15 days, and sludge concentration is 4000-5000 mg/L, water outlet of the improved oxidization channel is placed in the oxygen-enriched zone of downstream of aeration machine or independently-set forced aeration zone, and its sedimentation tank adopts a peripheral intake and peripheral discharge type. Said invention eliminates the sludge concentration pool, and adopts an integrated sludge concentration dehydration machine to make concentration and dehydration of residual sludge. Its phosphorous-removing efficiency is up to above 87%.

Description

Improved oxidation channel city sewage treamtent process

(1) technical field under

The present invention relates to be applicable to has the municipal sewage plant of strict demand and dephosphorization to require tighter geographic improved oxidation channel city sewage treamtent process to dephosphorization denitrogenation.

(2) technical background

Oxidation ditch has another name called the oxidation canal, gains the name because of its structures become the ring-type irrigation canals and ditches shape of sealing.Be a kind of modification of activated sludge process, be equivalent to the extended aeration system.Because the mixed solution of sewage and active sludge constantly circulates, therefore, not only the people is arranged but also be referred to as " circulated aeration tank ", " aerating system of endless " in the aeration channel.

First municipal sewage plant that adopts oxidation ditch process built at Dutch Fu Xiaoding in 1954.Since the sixties, the oxidation ditch sewage disposal technology obtains promotion and application rapidly on Europe, North America, South America and Australia and other places, and its technology and structure have all had bigger development, become the urban sewage treatment process of current tool vitality.By the reasonable Arrangement of aerator, on runner, form the AO technology of a plurality of polyphones in the oxidation ditch, reach the purpose of removing carbon source pollutent and nitrogen.

Oxidation ditch water technology of the prior art exists the long defective of sludge age, owing to before mud refluxes, do not pass through anaerobic treatment, so phosphor-removing effect is relatively poor, and only about 50%.In addition, also there are deficiencies such as construction costs height, floor space be big in whole technology.

(3), Fa Ming content

Technical problem to be solved by this invention provide a kind of have take up an area of province, less investment, working cost is low, dephosphorization efficiency by using is high, the improved oxidation channel city sewage treamtent process of convenient management.

It is such that the present invention solves the problems of the technologies described above the technical scheme that is adopted, and promptly comprises following processing step:

1, adopt thick, fine fack to remove the floating matter in the decontaminated water;

2, wastewater level is brought up to design height;

3, sand setting precipitation;

4, oxidation ditch is removed carbon source pollutent in the water and nitrogen element and the phosphorus that causes body eutrophication

Element;

5, settling tank carries out mud-water separation;

Feature of the present invention is:

1, settling pit adopts the eddy current settling pit;

2, returned sluge carried out 1～2 hour anaerobic treatment before returning oxidation ditch;

3, the design variable of improved oxidation ditch is: sludge age 10～15 days, sludge concentration

4000～5000mg/L；

4, the improved oxidation ditch water outlet is arranged on the oxygen-rich area in aerator downstream or the reinforcement that is provided with separately

The aeration zone;

5, settling tank adopts circumferential water feed peripheral effluent pond type;

6, the cancellation sludge thickener adopts integrated sludge concentration and dewatering machine that excess sludge is concentrated

And dehydration.

The present invention has reduced the reoxygenation in the water inlet owing to adopted the eddy current settling pit; Because returned sluge had carried out anaerobic treatment before returning oxidation ditch, can make the phosphorus in the subsequent handling obtain the excess absorption; Owing to shortened the sludge age of oxidation ditch, it is low to make sewage treatment facility take up an area of province, less investment, working cost; Owing to adopt all borders water peripheral effluent type settling tank, shortened the drain time of excess sludge, improved the dephosphorizing rate of whole technology; Owing to adopt integrated sludge concentration and dewatering machine that excess sludge is concentrated and dewater, reduced the concentration of phosphorus in the supernatant liquor, that has improved whole technology goes out phosphorus efficient.

(4), the description of the drawings

The present invention has following accompanying drawing:

Accompanying drawing 1 is a process flow sheet of the present invention;

Accompanying drawing 2 is the orthographic plan of the improved oxidation ditch that adopts in the technology of the present invention;

Accompanying drawing 3 is the sectional structure chart of the peripheral well water peripheral effluent settling tank that adopts in the technology of the present invention.

Referring to accompanying

drawing

2,3, the 1-water-in among the figure, 2-returned sluge mud inlet, 3-anaerobic pond, 4-diversion trench, 5-aerator, 6-improved oxidation ditch, 7-water-in, 8-peripheral effluent groove, 9-inhale mud scraper, 10-mud discharging pipe, 11-circumferential water feed groove.

(5), the specific embodiment

The specific embodiment of the present invention is further specified by accompanying drawing: referring to accompanying drawing 1: the processing step among the figure is:

(1) thick, fine fack

Slightly, fine fack is the first operation in the improved oxidation channel city sewage treamtent process. Its merit Can be with the bulk in the water inlet and the floating thing of fritter, such as polybag, branch, cardboard etc., from sewage Salvaging is come out, and stops these floating things to enter follow-up lifting pumping plant, damages water pump.

(2), sewage lifting pump station

Sewage lifting pump station is the second operation work in the improved oxidation channel city sewage treamtent process. It Function is to design height, for the gravity flow of water in the subsequent technique provides head height with sewage lifting.

(3), eddy current setting pot

The eddy current setting pot is the three process in the improved oxidation channel city sewage treamtent process. It Function be with settling property in the sewage preferably silt particle separate, reduce the inorganic silt particle enter oxidation ditch Amount, be beneficial to the normal operation of oxidation ditch. The silt particle of precipitation effluxes after dewatering through grit water separator.

(4) anaerobic pond

Anaerobic pond is the 4th procedure in the improved oxidation channel city sewage treamtent process. From eddy current The sewage of setting pot enters with the returnedactivatedsludge (being the microorganism cenobium) from the sludge reflux well Anaerobic pond mixes in the pond and reacts. Its major function has two: the one, and bioselection is done With, the disadvantageous bacterium of subsequent treatment is suppressed in this breeding, and the needed bacterium of follow-up processing Obtain amount reproduction, become dominant microflora; Second effect is that the phosphorus of releasing for polyP bacteria provides place and ring The border condition, the polyP bacteria in the activated sludge discharges the phosphorus in the body at this, for phosphorus in the subsequent handling Excess absorbs ready. Hydraulic detention time is 1～2 hour.

(5) improved oxidation ditch

Oxidation ditch is the five processes in the improved oxidation channel city sewage treamtent process. Its function To remove carbon source pollutant in the water and nitrogen element and the P elements of eutrophication. In oxidation On the runner of ditch, by aerator rationally is set, form anoxic---the denitrogenation that aerobic cycle alternation is arranged Technology; Simultaneously, the anaerobic pond of the aerobic section on the runner and the 4th procedure forms anaerobism---aerobic dephosphorization Technology, thereby, consisted of on the whole the A of improved oxidation ditch²O denitrogenation dephosphorizing mechanism. Oxidation ditch goes out The enhanced aeration district that the mouth of a river is arranged on the oxygen-rich area in aerator downstream or arranges separately makes polyP bacteria inhale phosphorus Effect is further strengthened. The improved oxidation ditch pond is deeply than other ditch moldeed depth, so that ditch body floor space is little, The area that is fit to very much city public land anxiety. In addition, the architectural image of oxidation ditch is more flexible, can With the requirement according to technology and surrounding environment, the building exterior design is become various succinct, graceful forms, The double action of play environment purification, beautifying the environment. Hydraulic detention time is 10～13 hours, sludge age 10～15 days, sludge concentration 4000～5000mg/L.

(6), sedimentation basin

Sedimentation basin is the 6th procedure in the improved oxidation channel city sewage treamtent process. Its function is Carry out mud-water separation, the moisture of activated sludge and processing is left, activated sludge enters sewer catch basin, clear water Standard discharge. The method of operation of circumferential water feed, peripheral effluent is adopted in design, and efficient is than center water inlet periphery The radical sedimentation basin efficient of water outlet improves more than the twice, and the floor space of sedimentation basin is reduced significantly, Saved and taken up an area and investment.

(7), returned sludge pumping plant

The effect of returned sludge pumping plant is capacity of returns and the discharge capacity by the control activated sludge, realizes oxygen Change the control of the interior sludge concentration of ditch and sludge age. Activated sludge part from sedimentation basin is refluxed mud Pump is transported to anaerobic pond, and near the excess sludge pumping plant another part then flows into becomes excess sludge.

(8) excess sludge pumping plant

The effect of excess sludge pumping plant is that excess sludge is transported between sludge dewatering by residual sludge pump Row concentrates and dehydration.

(9), Integral sludge concentrates/dewaterer

The effect of Integral sludge thickening machine is that the excess sludge that will discharge concentrates, dehydration. With dirt Mud thickener is compared, and adopts the time of staying before Integral sludge thickening machine has shortened sludge dewatering, Reduced the release of P elements, thereby the dephosphorization efficiency by using of whole treatment process is improved.

Above-mentioned Process for Effluent water quality reaches the primary standard in country's " composite wastewater discharge standard ", phosphorus Clearance reaches more than 87%.

Referring to accompanying drawing 2, water inlet 1 is communicated with setting pot with anaerobic pond 3, establish underwater propulsion in the anaerobic pond Device promotes flow and returned sludge is mixed with intaking. The water outlet of anaerobic pond is in the anoxic of oxidation ditch Section enters oxidation ditch 6 by pipeline or weir gate; The cross section of improved oxidation ditch 6 is rectangle, raceway groove it Between head and the tail be connected in series, forms a closed system, the effluent adopting weir gate is controlled; The inherent bend of ditch and exposing to the sun Mechanism of qi 5 downstreams are provided with training wall 4, and effect is to prevent that activated sludge and sewage are under bend place and aerator Trip separates, and affects treatment effect; Be provided with inversed umbrella type frequency conversion surface aerating machine at the raceway groove turning, can basis The concentration adjustment speed of oxygen in water, the control oxygenation capacity. Also can adopt other aerators, as turn to Dish, blast aeration add impeller etc., but the position on runner changes according to designing requirement.

Referring to accompanying drawing 3, precipitation pool with peripheral is cylindrical, and the centre is provided with the suction mud scraper 9, the suction mud scraper is pooled to the mud at the bottom of the pond mud discharging pipe 10 at center, pond and incites somebody to action in rotary course Mud is discharged. Cisterna ambiens wall inboard is provided with peripheral distribution channel 11, the water inlet 7 by distribution channel along the pool wall circumference Uniform distribution enters sedimentation basin. In sedimentation basin, mud and water are realized mud-water separation, and mud sinks to the pond The end,, clear water is then by emitting along the inboard peripheral effluent groove 8 that arranges of peripheral distribution channel.

Claims

1, a kind of improved oxidation channel city sewage treamtent process comprises following processing step:

(1), adopt thick, fine fack to remove the floating matter in the decontaminated water;

(2), wastewater level is brought up to design height;

(3), sand setting precipitation;

(4), oxidation ditch is removed carbon source pollutent in the water and nitrogen element and the phosphoric that causes body eutrophication;

(5), mud-water separation is carried out in the pond, shallow lake;

Feature of the present invention is:

A. the eddy current settling pit is adopted in the sand pond; B. flow the anaerobic treatment that mud carried out 1～2 hour before returning oxidation ditch; C. the design variable of good figure oxidation ditch is: sludge age 10～15 days, sludge concentration 4000～5000mg/L; D. good figure oxidation ditch water outlet is arranged on the oxygen-rich area in aerator downstream or the enhanced aeration district that is provided with separately; E. settling tank adopts circumferential water feed peripheral effluent pond type; F. cancel sludge thickener, adopt integrated sludge concentration and dewatering machine that excess sludge is concentrated and dewater.

2, improved oxidation channel city sewage treamtent process according to claim 1 is characterized in that: water-in (1) is communicated with settling pit with anaerobic pond (3), establish underwater propeller in the anaerobic pond; The water outlet of anaerobic pond enters oxidation ditch (6) in the anoxic section of oxidation ditch by pipeline or weir gate; The cross section of improved oxidation ditch (6) is a rectangle, and head and the tail are connected in series between the raceway groove, form a closed system, the control of effluent adopting weir gate; Inherent bend of ditch and aerator (5) downstream are provided with training wall (4).

3, improved oxidation channel city sewage treamtent process according to claim 1, it is characterized in that: precipitation pool with peripheral is cylindrical, the centre is provided with inhales mud scraper (9), cisterna ambiens wall inboard is provided with peripheral distributing trough (11), and water inlet enters settling tank by distributing trough along the uniformly distributing of pool wall circumference by water-in (7); Clear water is then by emitting along the inboard peripheral effluent groove (8) that is provided with of peripheral distributing trough.