CN103663689A - Integrated denitrification system for treating total nitrogen in sewage treatment plant and control method - Google Patents

Integrated denitrification system for treating total nitrogen in sewage treatment plant and control method Download PDF

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Publication number
CN103663689A
CN103663689A CN201310750501.7A CN201310750501A CN103663689A CN 103663689 A CN103663689 A CN 103663689A CN 201310750501 A CN201310750501 A CN 201310750501A CN 103663689 A CN103663689 A CN 103663689A
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China
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nitrate
integrated
water inlet
control valve
total nitrogen
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CN201310750501.7A
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Chinese (zh)
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CN103663689B (en
Inventor
丁建华
王东平
杜伟
陆鹏飞
迟培明
张刚
陈海波
崔琦
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青岛中宇环保科技有限公司
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Abstract

The invention relates to the field of sewage treatment, in particular to an integrated denitrification system for treating total nitrogen in a sewage treatment plant. A water inlet tube above the front side of an equipment shell is connected with a flow guiding and mixing area inside the equipment; the flow guiding and mixing area is connected with a denitrification area through a perforated lattice wall; a water outlet tube is arranged above the back side of the equipment shell; the water inlet tube and the water outlet tube are connected in parallel to an original sewage treatment system pipeline through T joints; an interception amount control valve is arranged on the original sewage treatment pipeline; a carbon source feeding device is further arranged outside the equipment; a filler is arranged into the denitrification area. The invention further provides a control method of the integrated denitrification system. Integrated denitrification system equipment is connected in parallel to the original sewage treatment pipeline, so that great convenience is brought to construction and installation, and the integrated denitrification system is very suitable for the modification and innovation of an original sewage treatment building, and has the advantages of short construction period and rapidness in construction. Moreover, the interception amount control valve can be used for fully or partially treating secondary treatment effluent, and is flexible in adjustability.

Description

Integrated denilrification system and the control method for sewage work's total nitrogen, processed
Technical field
The present invention relates to sewage treatment area, specifically a kind of integrated denilrification system and control method of processing for sewage work's total nitrogen.
Background technology
General urban wastewater treatment firm treatment process comprises equalizing tank, anaerobic pond, anoxic pond, Aerobic Pond, second pond, flocculation sedimentation tank, sterilization pool, and nitrogenous class material passes through Aerobic Pond therein, by aminating reaction and nitration reaction, change nitrate nitrogen into, by return-flow system, enter anoxic pond again, by anti-nitration reaction, change nitrogen into and deviate from, loop.
According to < < urban wastewater treatment firm pollutant emission standard > > GB18918-2002, stricter to the monitoring of total nitrogen.Conventionally the control flow that total nitrogen is processed is: (1) is in water outlet sampling, according to the mensuration alkalescence alkaline potassium per-sulfate digestion ultraviolet spectrophotometry > > chemical examination total nitrogen content of HJ636-2012 < < water quality total nitrogen; (2) data are higher, strengthen the unlatching of internal reflux pump, add proper amount of carbon source, as methyl alcohol, strengthen anoxic pond and mix dynamics; (3) data are normal, continue steady running.Above three step cycle are carried out.This scheme is lasted about 3-4 hour of cycle at every turn, needs to use import or high-precision Potassium Persulphate medicament in process, special chemical examination appliance requires pressure cooker, and chemical examination complexity is larger.In addition, after finding that total nitrogen exceeds standard, then carry out technique adjustment and mend the fold after the sheep is lost.And most of newly-built sewage works or original sewage work still face the situation that water outlet total nitrogen can not stably reaching standard or is on the verge of to exceed standard after upgrading now.
Summary of the invention
According to above-mentioned weak point, the object of this invention is to provide a kind of easy to adjustly, control effective integrated denilrification system and the control method of processing for sewage work's total nitrogen.
For achieving the above object, technical scheme of the present invention is: a kind of integrated denilrification system of processing for sewage work's total nitrogen, it comprises device housings, the top, front side of device housings is provided with water inlet pipe, water inlet pipe is connected with the water conservancy diversion mixing zone of device interior, water conservancy diversion mixing zone is connected with denitrification zone by perforation tracery wall, the back side top of device housings is provided with rising pipe, water inlet pipe and rising pipe are connected in parallel on the second pond and the pipeline between advanced treatment structures of original Sewage treatment systems by threeway, original sewage disposal pipeline is provided with the control valve that dams, device external is also provided with carbon source throwing device, the pipeline that adds of carbon source throwing device is positioned near water inlet pipe, inside, denitrification zone is provided with filler.
Preferably: described both sides, water conservancy diversion mixing zone are interval with flow deflector from top to bottom.
Preferably: described perforation tracery wall below is provided with perforation.
Preferably: described carbon source throwing device comprises carbon source storage tank and is positioned at the automatic gauge pump of carbon source storage tank top.
Preferably: the water-in absolute altitude of described water inlet pipe is higher than the water outlet absolute altitude of rising pipe.
The present invention also provides a kind of control method of integrated denilrification system, in the sampling of equipment water inlet pipe road junction, according to mensuration ultraviolet spectrophotometry (trying) the > > of HJ/T346-2007 < < water quality nitrate nitrogen, detect nitrate nitrogen content; When data are normal, equipment continues steady running; Higher when nitrate nitrogen content, regulate the control valve that dams.
Preferably: the dam determination methods of control valve of described adjusting is, first calculate nitrate ultimate value, nitrate ultimate value=(current operative norm total nitrogen value-daily experience ammonia nitrogen value) * nitrate nitrogen content accounts for total nitrogen content; Calculate again the open amount of the control valve that dams, the open amount=1-of the control valve that dams { (current mensuration nitrate content-nitrate ultimate value)/current mensuration nitrate content }.
Preferably: the ratio that described nitrate nitrogen content accounts for total nitrogen content is 0.75-0.90.
Beneficial effect of the present invention is: by integrated denilrification system equipment in parallel on original sewage disposal pipeline, construction and installation are very convenient, are highly suitable for transformation and innovation that raw waste water is processed structures, have the duration short, the advantage of quick construction.In addition, the control valve that dams can be accomplished all or part of processing secondary treatment yielding water, has modulability flexibly.
Filler filter tank after tradition second-stage treatment, mostly is carbonization nitration denitrification filter tank, and it is mainly the small-sized set of traditional technology link high level.Consider that secondary biochemical system carried out the processing of darker degree to BOD, basic degraded is complete, and water outlet process second pond SS is also in lower level, other contamination indexs are significantly degraded substantially, and follow-up advanced treatment link is still for pollution substances such as COD and SS, so native system is appointed as nitrate nitrogen by target contaminant, for nitrate nitrogen, technical process is set, significantly reduce investment cost, avoided duplicated project investment, improved operation rate.On the other hand, overcome after routine adjustment measure, still can not make total nitrogen content problem up to standard.
In control method, nitrate nitrogen being detected for sewage work's monitoring is a kind of conveniently means.The use of native system and control method has greatly strengthened the ageing of sewage work's total nitrogen processing, has not only strengthened the processing power of sewage work to total nitrogen, has reduced especially the difficulty of total nitrogen monitoring.
Integrated carbon source adds and sewage mixes link, and efficiency is high takes up an area less, and utilizes biofilm carrier high-biomass can carry out fast anti-nitration reaction.
This integration apparatus Yi Zuwei unit, can be supporting flexibly according to actual requirement.
Except anti-nitration reaction need utilize certain carbon source, there is not other organic degradeds in oxygen-starved area part, thereby self sludge output is little, and the part mud of generation can be processed with current penetration depth processing links, substantially can not cause new burden to original system.
Do not use filter tank structure, greatly reduced head loss, for sewage work has saved expenditure on power.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the side elevational view of water conservancy diversion of the present invention mixing zone.
Fig. 3 is the sectional view of perforation tracery wall of the present invention.
Fig. 4 is workflow diagram of the present invention.
In figure, 1-device housings; 2-water inlet pipe; 3-rising pipe; 4-water conservancy diversion mixing zone; The 5-tracery wall of boring a hole; 6-denitrification zone; 7-threeway; 8-second pond; 9-advanced treatment structures; The 10-control valve that dams; 11-adds pipeline; 12-filler; 13-automatic gauge pump; 14-carbon source storage tank; 15-flow deflector; 16-perforation.
Embodiment
Below in conjunction with embodiment, the present invention will be further described.
A kind of integrated denilrification system of processing for sewage work's total nitrogen as Figure 1-3, it comprises device housings 1, the top, front side of device housings 1 is provided with water inlet pipe 2, water inlet pipe 2 is connected with the water conservancy diversion mixing zone 4 of device interior, water conservancy diversion mixing zone 4 is connected with denitrification zone 6 by perforation tracery wall 5, and perforation tracery wall 5 belows are provided with perforation 16.The back side top of device housings 1 is provided with rising pipe 3, wherein, water inlet pipe 2 and rising pipe 3 are connected in parallel on the second pond 8 and the pipeline between advanced treatment structures 9 of original Sewage treatment systems by threeway 7, original sewage disposal pipeline is provided with the control valve 10 that dams, device external is also provided with carbon source throwing device, carbon source throwing device can suitably be opened as required, for anti-nitration reaction provides carbon source.Carbon source throwing device comprises carbon source storage tank 14 and the automatic gauge pump 13 that is positioned at carbon source storage tank 14 tops, and wherein, the pipeline 11 that adds of carbon source throwing device is positioned near water inlet pipe 2, and 6 inside, denitrification zone are provided with filler 12.Selected filler 12 is sea filler, and its specific surface area is large, and hole is many, very suitable biofilm development, and for denitrifying bacterium provides carrier, biomass is very big.4 both sides, water conservancy diversion mixing zone are interval with flow deflector 15 from top to bottom, and sewage enters water conservancy diversion mixing zone 4 by its upper side, undertaken back and forth, turned back be mobile in water conservancy diversion mixing zone 4 by flow deflector 15, play even mixing effect.Effluent stream, to 4 foots of water conservancy diversion mixing zone, through 5 water distributions of perforation tracery wall, evenly enters denitrification zone 6.The water-in absolute altitude of water inlet pipe 2 is higher than the water outlet absolute altitude of rising pipe 3.
The present invention also provides a kind of control method of integrated denilrification system, in the 2 road junction samplings of equipment water inlet pipe, according to mensuration ultraviolet spectrophotometry (trying) the > > of HJ/T346-2007 < < water quality nitrate nitrogen, detect nitrate nitrogen content; When data are normal, equipment continues steady running; Higher when nitrate nitrogen content, regulate the control valve 10 that dams.
Wherein, regulate the method for calculation of the control valve that dams to be, first calculate nitrate ultimate value, nitrate ultimate value=(current operative norm total nitrogen value-daily experience ammonia nitrogen value) * nitrate nitrogen content accounts for total nitrogen content; Calculate again the open amount of the control valve that dams, the open amount=1-of the control valve that dams { (current mensuration nitrate content-nitrate ultimate value)/current mensuration nitrate content }.Wherein, to account for the ratio of total nitrogen content be 0.75-0.90 to nitrate nitrogen content.
Principle of the present invention is: whole denitrification zone does not have Air supply facility, is anoxic pond, take full advantage of the non-anaerobic state of second pond water outlet, and hydraulic detention time is 2 hours, is not enough to change into the multiple advantages such as anaerobic environment.Stable anaerobic environment is the bioselection of denitrifying bacterium the condition that facilitates.Denitrifying bacterium can utilize a certain amount of carbon source and electron donor to carry out anti-nitration reaction in anaerobic environment, the nitrate nitrogen in sewage is converted into nitrogen and deviates from.
With an example, beneficial effect of the present invention is described below.
One, somewhere 600m 3the Sewage Treatment Facilities of/d, in existing facility, anoxic pond is too small, and water outlet total nitrogen content is in 15-20mg/L left and right, and its Effluent criteria requires as one-level a, and total nitrogen content requires in 15mg/L.As requested, on existing facility, add 20m of the present invention 3the integrated denilrification system of volume, records former water outlet nitrate content and is 18mg/L left and right, opens 1/3rd control valves that dam, and enters integrated denilrification system of the present invention, and the residence time is 2.5h.After 3h, sampling detects, and original system water outlet nitrate content is still 18mg/L, and integrated denilrification system water outlet nitrate content is 1mg/L, after two place's current mix, measuring total nitrogen content is 13.5mg/L, lower than total nitrogen content at 15mg/L with interior standard-required, therefore, up to standard.

Claims (8)

1. an integrated denilrification system of processing for sewage work total nitrogen, it is characterized in that: it comprises device housings (1), the top, front side of device housings (1) is provided with water inlet pipe (2), water inlet pipe (2) is connected with the water conservancy diversion mixing zone (4) of device interior, water conservancy diversion mixing zone (4) is connected with denitrification zone (6) by perforation tracery wall (5), the back side top of device housings (1) is provided with rising pipe (3), described water inlet pipe (2) and rising pipe (3) are connected in parallel on the second pond (8) and the pipeline between advanced treatment structures (9) of original Sewage treatment systems by threeway (7), original sewage disposal pipeline is provided with the control valve that dams (10), device external is also provided with carbon source throwing device, the pipeline (11) that adds of carbon source throwing device is positioned near water inlet pipe (2), inside, denitrification zone (6) is provided with filler (12).
2. according to integrated denilrification system claimed in claim 1, it is characterized in that: described both sides, water conservancy diversion mixing zone (4) are interval with flow deflector (15) from top to bottom.
3. according to integrated denilrification system claimed in claim 1, it is characterized in that: described perforation tracery wall (5) below is provided with perforation (16).
4. according to integrated denilrification system claimed in claim 1, it is characterized in that: described carbon source throwing device comprises carbon source storage tank (14) and is positioned at the automatic gauge pump (13) of carbon source storage tank (14) top.
5. according to integrated denilrification system claimed in claim 1, it is characterized in that: the water-in absolute altitude of described water inlet pipe (2) is higher than the water outlet absolute altitude of rising pipe (3).
6. according to the control method of integrated denilrification system claimed in claim 1, it is characterized in that: in the sampling of equipment water inlet pipe (2) road junction, according to mensuration ultraviolet spectrophotometry (trying) the > > of HJ/T346-2007 < < water quality nitrate nitrogen, detect nitrate nitrogen content; When data are normal, equipment continues steady running; Higher when nitrate nitrogen content, regulate the control valve (10) that dams.
7. according to the control method of integrated denilrification system claimed in claim 6, it is characterized in that: the dam method of calculation of control valve (10) of described adjusting are, first calculate nitrate ultimate value, nitrate ultimate value=(current operative norm total nitrogen value-daily experience ammonia nitrogen value) * nitrate nitrogen content accounts for the ratio of total nitrogen content; Calculate again the open amount of the control valve that dams, the open amount=1-of the control valve that dams { (current mensuration nitrate content-nitrate ultimate value)/current mensuration nitrate content }.
8. according to the control method of integrated denilrification system claimed in claim 7, it is characterized in that: the ratio that described nitrate nitrogen content accounts for total nitrogen content is 0.75-0.90.
CN201310750501.7A 2013-12-31 2013-12-31 Integrated denitrification system for treating total nitrogen in sewage treatment plant and control method CN103663689B (en)

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