CN103382051B - Apparatus and method used for enhancing low-temperature bio-nitrification effects - Google Patents
Apparatus and method used for enhancing low-temperature bio-nitrification effects Download PDFInfo
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Abstract
The invention discloses an apparatus and a method used for enhancing low-temperature bio-nitrification effects. The apparatus comprises a SBR denitrification reaction vessel, a sludge enhancing pond, a sludge digestion liquid tank, a city waste water tank, an additional carbon resource tank, a temperature sensor, a pH sensor, a DO sensor, and a programmable process controller. According to the method, the bio-nitrification effects of excess sludge which is discharged by the SBR denitrification reaction vessel are enhanced by a high ammonia nitrogen content (200mg/L) and a high temperature (30 DEG C) of original liquid of the sludge digestion liquid; the enhanced excess sludge is transferred back to the SBR denitrification reaction vessel; and then the SBR denitrification reaction vessel low-temperature bio-nitrification effects are enhanced. The apparatus and the method help to combine the treatment of the sludge digestion liquid and the enhancement of the low-temperature bio-nitrification effects, so that the designed SBR denitrification reaction vessel possesses excellent bio-nitrification effects at a low temperature, reaction time of bio-nitrification is short, aeration energy consumption is less, operation and management are flexible, and effluent quality is stable.
Description
Technical field
The present invention relates to a kind of apparatus and method of strengthening low-temperature biological nitrification effect, belong to dirty water living creature processing technique field, be applicable to the advanced treatment of Municipal Wastewater in Cold Region.
Background technology
Along with the raising of national life level, total emission volumn and the Pollutant levels of municipal effluent increase gradually; Because the environmental problems such as water body " eutrophication " become increasingly conspicuous, growing environmental protection requirement and current environment pollution situation contradiction are deepened day by day, and the processing emission standard that country formulates for municipal effluent also improves gradually; This two aspect all requires sewage work to increase processing power, improves treatment effect;
Bio-denitrifying sewage technology is the important research direction in water pollution control field, in < < urban wastewater treatment firm pollutant emission standard > > (GB18918-2002), the ammonia nitrogen of urban wastewater treatment firm (total nitrogen) is required to be: water outlet must not be higher than 5(15) mg/L; Therefore efficient, the less energy-consumption of research and development, eco-friendly biological denitrification process are the research emphasis of current water treatment field with device.
Biological denitrification process comprises nitre
wherein nitrifying process is rate-limiting step, and nitrobacteria plays a major role.Nitrobacteria is chemosynthetic bacteria, poor growth, mud
Age is long, and temperature is very remarkable to its activity influence.Sewage work often faces the problem of water outlet ammonia nitrogen concentration (being that nitrification effect is poor) not up to standard winter,
Particularly, for cold district, under cold condition, how (<15 ℃) keeps nitrobacteria activity to guarantee that nitrification effect is that current sewage work is badly in need of dealing with problems.
Sludge digestion liquid is typical high-ammonia-nitrogen sewage, generally by sludge digestion tank, be directly back to sewage work's front end, this will inevitably increase sewage work's nitrogen load, increases sewage work's ammonia nitrogen qualified discharge difficulty in winter, therefore sludge digestion liquid is carried out to pre-treatment very necessary.
But up to the present, the measure both at home and abroad strengthening nitrification effect being proposed is mostly based on adding filler, adding engineering bacteria etc., but these measures also can bring the new problems such as filler loss, biofilm difficulty, engineering bacteria degeneration.Therefore, instantly need the urgent technical problem solving to be exactly: how can propose a kind of effective means, to strengthen low-temperature biological nitrification effect.
Summary of the invention:
The object of the invention is to solve a difficult problem for the nitrated difference of low-temperature biological, a kind of method and apparatus of strengthening low-temperature biological nitrification effect is provided.
Method provided by the present invention is by adopting sludge digestion liquid strengthening excess sludge Nitrification, and the mode that is back to SBR denitrification system strengthens the nitrification effect of SBR denitrification system, optimize the population structure of microorganism in reactive system, thus strengthening low-temperature biological nitrification effect.
The invention provides a kind of device (see figure 1) of strengthening low-temperature biological nitrification effect, comprising:
SBR denitrification reactor 4 connects municipal sewers 3, water shoot 6, aeration tube 11, external carbon source capsule 15, excess sludge discharge pipe 19, return line 29; Intake pump 2 is set on municipal sewers 3; On water shoot 6, set out water valve 7; Aeration valve 10 is set on aeration tube 11; Dosing pump 14 is set on external carbon source capsule 15; Mud valve 20 is set on excess sludge discharge pipe 19; Sludge reflux pump 28 is set on return line 29; Municipal effluent case 1 is connected to SBR denitrification reactor 4 by municipal sewers 3; Additional carbon case 13 is connected to SBR denitrification reactor 4 by external carbon source capsule 15; Air compressor 9 is connected to SBR denitrification reactor 4 by aeration tube 11; Rising pipe 8 is connected to SBR denitrification reactor 4 by water shoot 6; In interior agitator 5, temperature sensor 16, pH sensor 17, DO sensor 18, the aeration sand head 12 of arranging of SBR denitrification reactor 4; Mud strengthening pond 21 is open container; Mud strengthening pond 21 is connected to SBR denitrification reactor 4 by excess sludge discharge pipe 19, return line 29 respectively; Mud strengthening pond 21 connects excess sludge discharge pipe 19, return line 29, sludge digestion liquid water inlet pipe 24, inlet pipe 31; Sludge digestion liquid intake pump 25 is set on sludge digestion liquid water inlet pipe 24; Air intake valve 30 is set in inlet pipe 31; Sludge digestion liquid water tank 23 is connected to mud strengthening pond 21 by sludge digestion liquid water inlet pipe 24; Interior aeration head 22, temperature-sensing probe 26, the heating rod 27 of arranging in mud strengthening pond 21; Temperature sensor 16, pH sensor 17, DO sensor 18, temperature-sensing probe 26, heating rod 27 are connected with process controller 32 able to programme; The interior setting of process controller 32 able to programme stirred rly. 33, dosing rly. 34, aeration rly. 35, water inlet rly. 36, temperature sensing interface 37, pH sensing interface 38, DO sensing interface 39, draining rly. 40, sludge reflux rly. 41, spoil disposal rly. 42, temperature-sensitive interface 43, heating rod rly. 44, sludge digestion liquid water inlet rly. 45, air inlet rly. 46, air compressor rly. 47; Process controller 32 able to programme connects agitator 5, dosing pump 14, aeration valve 10, intake pump 2, outlet valve 7, sludge reflux pump 28, mud valve 20, sludge digestion liquid intake pump 25, air intake valve 30, air compressor 9;
The present invention also provides a kind of method of strengthening low-temperature biological nitrification effect, comprising:
I water inlet, than being made as 30%～40%, starts intake pump municipal effluent is added to SBR denitrification reactor; When reaching, setting intakes than then closes intake pump;
II starts agitator, air compressor and aeration valve, process controller able to programme receives pH sensor values in real time, the pH data that receive are carried out to filtering and differentiate processing, when the first order derivative of pH value is by just bearing change, and aeration time surpasses 1 hour, closes aeration valve, closes air compressor;
III starts dosing pump, and additional carbon is added to SBR denitrification reactor, and the pH data that receive are carried out to filtering with process controller able to programme and differentiate is processed, and when the first order derivative of pH value is by just becoming negative and hold-time during over 5 minutes, closes dosing pump;
IV starts outlet valve, by adjusting water valve working time control SBR denitrification reactor sludge age, is 25～35 days, and sludge volume accounts for 1/25～1/35 of the total mud amount of SBR denitrification reactor, closes outlet valve;
V starts air compressor, aeration valve, when DO closes aeration valve, agitator within the scope of 2～4mg/L;
VI sedimentation time is made as 30～60 minutes, reaches setting-up time and opens outlet valve;
VII draining ratio is made as 30%～40%, reaches setting draining ratio and closes outlet valve;
VIII starts mud valve, and the mud that SBR denitrification reactor internal volume is 1%～5% is closed mud valve after flowing into mud strengthening pond, returns to operation I;
When A starts operation I, start sludge digestion liquid intake pump, heating rod, air intake valve; Process controller able to programme receives temperature-sensing probe numerical value in real time, by controlling the open and close controlling mud of heating rod, strengthens pond water temperature at 25 ℃～30 ℃; Water inlet, than being set as 10～30%, detects free ammonia FA concentration in the rear mud strengthening of water inlet mixing pond and within the scope of 10～20mg/L, closes sludge digestion liquid intake pump, before air intake valve is worked always and started to operation III;
When B starts operation III, close air intake valve, heating rod, start sludge reflux pump, sludge reflux amount accounts for mud strengthening pond useful volume ratio and is set as 70～90%, when reaching, set sludge reflux amount and account for mud strengthening pond useful volume and than then close sludge reflux pump, during operation I startup by the time, return to operation A.
Further, in described step VIII, mud strengthening pond useful volume be SBR denitrification reactor useful volume 1/80～1/100.
To sum up, the method and apparatus of strengthening low-temperature biological nitrification effect provided by the invention, for the poor present situation of the lower nitrification effect of cold district water temperature, proposes a kind of method of strengthening low-temperature biological nitrification effect.
Know-why of the present invention is: utilize the high feature that is conducive to ammonia oxidizing bacteria growth of sludge digestion liquid temp height and ammonia nitrogen concentration, adopt excess sludge lignin-sludge Digestive system, increase ammonia oxidation bacteria quantity in mud, strengthen nitrification effect; Sludge reflux to SBR denitrification system after strengthening is conducive to improve its nitrification ability, this is conducive to maintaining of biological nitration effect under cold condition and stable, reduce the nitrated time, improve volumetric loading, strengthen the impact resistance that SBR denitrification system reduces temperature.
The present invention has the following advantages:
1) the present invention has overcome poor, the unsettled disadvantageous effect of low-temperature biological nitrification effect, utilize sludge digestion liquid strengthening excess sludge and reflux and can strengthen the nitrification effect of SBR denitrification system, improving ammonia oxidizing bacteria quantity in mud, for how strengthening low-temperature biological nitrification effect, providing technical support;
2) the nitration reaction time short, volumetric loading is high, the lifting of SBR denitrification system Nitrification is conducive to reduce the nitration reaction time, improves system ammonia nitrogen loading;
3) introduce mud strengthening pond lignin-sludge Digestive system, can reduce the disadvantageous effect that sludge digestion liquid refluxes to sewage work; In mud strengthening pond, sludge concentration is high, reaction efficiency is high, can reduce the floor space of sludge digestion liquid treatment facility;
4) automatization level is high, energy conservation and consumption reduction effects is remarkable, because SBR denitrification system has adopted pH, as the roundabout process of nitrifying process and denitrification process, control parameter, can stop in time aeration and stop additional carbon according to the fluctuation of influent quality, effectively reduce energy consumption, save working cost.
Accompanying drawing explanation
Fig. 1 device schematic diagram of the present invention.
SBR denitrification reactor 4 connects municipal sewers 3, water shoot 6, aeration tube 11, external carbon source capsule 15, excess sludge discharge pipe 19, return line 29; Intake pump 2 is set on municipal sewers 3; On water shoot 6, set out water valve 7; Aeration valve 10 is set on aeration tube 11; Dosing pump 14 is set on external carbon source capsule 15; Mud valve 20 is set on excess sludge discharge pipe 19; Sludge reflux pump 28 is set on return line 29; Municipal effluent case 1 is connected to SBR denitrification reactor 4 by municipal sewers 3; Additional carbon case 13 is connected to SBR denitrification reactor 4 by external carbon source capsule 15; Air compressor 9 is connected to SBR denitrification reactor 4 by aeration tube 11; Rising pipe 8 is connected to SBR denitrification reactor 4 by water shoot 6; In interior agitator 5, temperature sensor 16, pH sensor 17, DO sensor 18, the aeration sand head 12 of arranging of SBR denitrification reactor 4; Mud strengthening pond 21 is connected to SBR denitrification reactor 4 by excess sludge discharge pipe 19, return line 29 respectively; Mud strengthening pond 21 connects excess sludge discharge pipe 19, return line 29, sludge digestion liquid water inlet pipe 24, inlet pipe 31; Sludge digestion liquid intake pump 25 is set on sludge digestion liquid water inlet pipe 24; Air intake valve 30 is set in inlet pipe 31; Sludge digestion liquid water tank 23 is connected to mud strengthening pond 21 by sludge digestion liquid water inlet pipe 24; Interior aeration head 22, temperature-sensing probe 26, the heating rod 27 of arranging in mud strengthening pond 21; Temperature sensor 16, pH sensor 17, DO sensor 18, temperature-sensing probe 26, heating rod 27 are connected with process controller 32 able to programme; The interior setting of process controller 32 able to programme stirred rly. 33, dosing rly. 34, aeration rly. 35, water inlet rly. 36, temperature sensing interface 37, pH sensing interface 38, DO sensing interface 39, draining rly. 40, sludge reflux rly. 41, spoil disposal rly. 42, temperature-sensitive interface 43, heating rod rly. 44, sludge digestion liquid water inlet rly. 45, air inlet rly. 46, air compressor rly. 47; Process controller 32 able to programme connects agitator 5, dosing pump 14, aeration valve 10, intake pump 2, outlet valve 7, sludge reflux pump 28, mud valve 20, sludge digestion liquid intake pump 25, air intake valve 30, air compressor 9;
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described: as shown in the figure, strengthening low-temperature biological nitrification effect device schematic diagram comprises: SBR denitrification reactor 4 connects municipal sewers 3, water shoot 6, aeration tube 11, external carbon source capsule 15, excess sludge discharge pipe 19, return line 29; Intake pump 2 is set on municipal sewers 3; On water shoot 6, set out water valve 7; Aeration valve 10 is set on aeration tube 11; Dosing pump 14 is set on external carbon source capsule 15; Mud valve 20 is set on excess sludge discharge pipe 19; Sludge reflux pump 28 is set on return line 29; Municipal effluent case 1 is connected to SBR denitrification reactor 4 by municipal sewers 3; Additional carbon case 13 is connected to SBR denitrification reactor 4 by external carbon source capsule 15; Air compressor 9 is connected to SBR denitrification reactor 4 by aeration tube 11; Rising pipe 8 is connected to SBR denitrification reactor 4 by water shoot 6; In interior agitator 5, temperature sensor 16, pH sensor 17, DO sensor 18, the aeration sand head 12 of arranging of SBR denitrification reactor 4; Mud strengthening pond 21 is connected to SBR denitrification reactor 4 by excess sludge discharge pipe 19, return line 29 respectively; Mud strengthening pond 21 connects excess sludge discharge pipe 19, return line 29, sludge digestion liquid water inlet pipe 24, inlet pipe 31; Sludge digestion liquid intake pump 25 is set on sludge digestion liquid water inlet pipe 24; Air intake valve 30 is set in inlet pipe 31; Sludge digestion liquid water tank 23 is connected to mud strengthening pond 21 by sludge digestion liquid water inlet pipe 24; Interior aeration head 22, temperature-sensing probe 26, the heating rod 27 of arranging in mud strengthening pond 21; Temperature sensor 16, pH sensor 17, DO sensor 18, temperature-sensing probe 26, heating rod 27 are connected with process controller 32 able to programme; The interior setting of process controller 32 able to programme stirred rly. 33, dosing rly. 34, aeration rly. 35, water inlet rly. 36, temperature sensing interface 37, pH sensing interface 38, DO sensing interface 39, draining rly. 40, sludge reflux rly. 41, spoil disposal rly. 42, temperature-sensitive interface 43, heating rod rly. 44, sludge digestion liquid water inlet rly. 45, air inlet rly. 46, air compressor rly. 47; Process controller 32 able to programme connects agitator 5, dosing pump 14, aeration valve 10, intake pump 2, outlet valve 7, sludge reflux pump 28, mud valve 20, sludge digestion liquid intake pump 25, air intake valve 30, air compressor 9;
The municipal effluent of Yi Mou university discharge is research object (pH=7-7.8, COD=170-310mg/L, NH
4 +-N=63-91mg/L).It is 7.0m that testing apparatus adopts effective volume
3pilot scale SBR as SBR denitrification reactor, it is 2.6m that each cycle is processed the water yield
3, in the post-reactor of having intake, COD concentration is 150-230mg/L, NH
4 +-N concentration is 18-37mg/L, and additional carbon adopts the ethanol that volume fraction is 95%; Adopting the SBR device that useful volume is 70L is mud strengthening pond, and sludge digester liquor adopts simulation water distribution, and water quality is NH
4 +-N concentration is 950-1200mg/L, and basicity is 1400-2000mg/L, and pH is 6.5-8.1.
The method of enhanced biological nitrification effect of the present invention comprises the following steps:
I flooding time is 18min, water inlet is than being 37%, by process controller able to programme, control intake pump, start intake pump municipal effluent is added to SBR denitrification reactor from municipal effluent case, when starting intake pump, start agitator, air compressor and aeration valve; When intake pump is closed in water inlet when reaching 37%;
II starts agitator, air compressor and aeration valve, process controller able to programme receives pH sensor values in real time, the pH data that receive are carried out to filtering and differentiate is processed, when the first order derivative of pH value by just bearing change and aeration time over 1 hour, close aeration valve, close air compressor;
III starts dosing pump, and additional carbon is added to SBR denitrification reactor, and the pH data that receive are carried out to filtering with process controller able to programme and differentiate is processed, and when the first order derivative of pH value is by just becoming negative and hold-time during over 5 minutes, closes dosing pump;
IV starts outlet valve, and discharging muddy water mixed solution volume is 233L, and the spoil disposal time is 10min, and sludge age is about 30 days, reaches 10min and closes outlet valve after the time;
V starts air compressor, aeration valve, detects DO concentration value, closes aeration valve, agitator when DO is within the scope of 2～4mg/L;
VI sedimentation time is 30min, reaches 30min and enters next step operation;
VII starts outlet valve, and draining ratio is 37%, closes outlet valve;
VIII starts mud valve, and the excess sludge discharge time is 7min, and excess sludge discharge pipe flow is 10L/min, and the mud of SBR denitrification reactor 5% flows into mud strengthening pond, closes mud valve, returns to operation I;
When A starts operation I, start sludge digestion liquid intake pump, heating rod, air intake valve; Process controller able to programme receives temperature-sensing probe numerical value in real time, by controlling the open and close controlling mud of heating rod, strengthens pond water temperature at 30 ℃ ± 1 ℃; Water inlet is than being set as 10%, sludge digestion liquid flooding time is 5min, sludge digestion liquid intake pump flow is 2L/min, detect free ammonia FA concentration in the rear mud strengthening of water inlet mixing pond and within the scope of 20 ± 5mg/L, close sludge digestion liquid intake pump, before air intake valve is worked always and started to operation III;
When B starts operation III, close air intake valve, heating rod, start sludge reflux pump, sludge reflux pump return time is 8min, sludge reflux pumping capacity is 7L/min, sludge reflux amount accounts for mud strengthening pond useful volume ratio and is set as 80%, when reaching, sets sludge reflux amount and accounts for mud strengthening pond useful volume and than then close sludge reflux pump, returns to operation A during operation I startup by the time;
In SBR denitrification reactor of the present invention, sludge concentration MLSS is 2000 – 3000mg/L; Mud strengthening pond sludge concentration is 10000 – 15000mg/L;
After mud strengthening pond water inlet of the present invention mixes, ammonia nitrogen concentration is 150～250mg/L;
After system run all right, when temperature is 13 ℃, adopts mud strengthening pond strengthening excess sludge and reflux, SBR denitrification system than ammonia oxidation speed, be 29.29mgNH
4 +-N/ (g vssd); Direct returned sluge, SBR denitrification system than ammonia oxidation speed, be 24.72mgNH
4 +-N/ (g vssd); SBR denitrification system water outlet ammonia nitrogen concentration is 1-5mg/L, and water outlet total nitrogen concentration is 1-9mg/L.Visible the present invention can strengthen low-temperature biological nitrification effect, maintains water outlet ammonia nitrogen and total nitrogen qualified discharge.
Claims (1)
1. apply a kind of method of strengthening the device of low-temperature biological nitrification effect, this apparatus structure is as follows:
SBR denitrification reactor connects municipal sewers, water shoot, aeration tube, external carbon source capsule, excess sludge discharge pipe, return line; Intake pump is set on municipal sewers; On water shoot, set out water valve; Aeration valve is set on aeration tube; On external carbon source capsule, dosing pump is set; On excess sludge discharge pipe, mud valve is set; Sludge reflux pump is set on return line; Municipal effluent case is connected to SBR denitrification reactor by municipal sewers; Additional carbon case is connected to SBR denitrification reactor by external carbon source capsule; Air compressor is connected to SBR denitrification reactor by aeration tube; Rising pipe is connected to SBR denitrification reactor by water shoot; Agitator, temperature sensor, pH sensor, DO sensor, aeration sand head are set in SBR denitrification reactor; Mud strengthening pond is connected to SBR denitrification reactor by excess sludge discharge pipe, return line respectively; Mud strengthening pond connects excess sludge discharge pipe, return line, sludge digestion liquid water inlet pipe, inlet pipe; Sludge digestion liquid intake pump is set on sludge digestion liquid water inlet pipe; Air intake valve is set in inlet pipe; Sludge digestion liquid water tank is connected to mud strengthening pond by sludge digestion liquid water inlet pipe; Mud strengthening arranges aeration head, temperature-sensing probe, heating rod in pond; Temperature sensor, pH sensor, DO sensor, temperature-sensing probe, heating rod are connected with process controller able to programme; In process controller able to programme, arrange and stir rly., dosing rly., aeration rly., water inlet rly., temperature sensing interface, pH sensing interface, DO sensing interface, draining rly., sludge reflux rly., spoil disposal rly., temperature-sensitive interface, heating rod rly., sludge digestion liquid water inlet rly., air inlet rly., air compressor rly.; Process controller able to programme connects agitator, dosing pump, aeration valve, intake pump, outlet valve, sludge reflux pump, mud valve, sludge digestion liquid intake pump, air intake valve, air compressor;
It is characterized in that, comprise the following steps:
I water inlet, than being made as 30%～40%, starts intake pump municipal effluent is added to SBR denitrification reactor; When reaching, setting intakes than then closes intake pump;
II starts agitator, air compressor and aeration valve, process controller able to programme receives pH sensor values in real time, the pH data that receive are carried out to filtering and differentiate processing, when the first order derivative of pH value is by just bearing change, and aeration time surpasses 1 hour, closes aeration valve, closes air compressor;
III starts dosing pump, and additional carbon is added to SBR denitrification reactor, and the pH data that receive are carried out to filtering with process controller able to programme and differentiate is processed, and when the first order derivative of pH value is by just becoming negative and hold-time during over 5 minutes, closes dosing pump;
IV starts outlet valve, by adjusting water valve working time control SBR denitrification reactor sludge age, is 25～35 days, and sludge volume accounts for 1/25～1/35 of the total mud amount of SBR denitrification reactor, closes outlet valve;
V starts air compressor, aeration valve, when DO closes aeration valve, agitator within the scope of 2～4mg/L;
VI sedimentation time is made as 30～60 minutes, reaches setting-up time and opens outlet valve;
VII draining ratio is made as 30%～40%, reaches setting draining ratio and closes outlet valve;
VIII starts mud valve, and the mud that SBR denitrification reactor internal volume is 1%～5% is closed mud valve after flowing into mud strengthening pond, returns to operation I;
When A starts operation I, start sludge digestion liquid intake pump, heating rod, air intake valve; Process controller able to programme receives temperature-sensing probe numerical value in real time, by controlling the open and close controlling mud of heating rod, strengthens pond water temperature at 25 ℃～30 ℃; Water inlet, than being set as 10～30%, detects free ammonia FA concentration in the rear mud strengthening of water inlet mixing pond and within the scope of 10～20mg/L, closes sludge digestion liquid intake pump, before air intake valve is worked always and started to operation III;
When B starts operation III, close air intake valve, heating rod, start sludge reflux pump, sludge reflux amount accounts for mud strengthening pond useful volume ratio and is set as 70～90%, when reaching, set sludge reflux amount and account for mud strengthening pond useful volume and than then close sludge reflux pump, during operation I startup by the time, return to operation A.
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| CN104261561A (en) * | 2014-09-25 | 2015-01-07 | 扬州大学 | Sequencing batch reactor activated sludge process (SBR) with low yield of sludge and low energy consumption |
| CN109523094B (en) * | 2018-12-21 | 2023-07-25 | 哈尔滨工程大学 | Ship salty sewage treatment control prediction system and prediction method based on wavelet neural network |
| CN109574213B (en) * | 2018-12-25 | 2021-12-28 | 兖矿国宏化工有限责任公司 | Method for treating high ammonia nitrogen wastewater in coal chemical industry by using enhanced SBR process tank |
| CN110606566B (en) * | 2019-09-30 | 2021-08-31 | 杭州电子科技大学 | Sludge fermentation coupling biological denitrification system |
| CN112479369A (en) * | 2020-11-10 | 2021-03-12 | 大连民族大学 | Toilet sewage treatment device and method |
| CN112777876B (en) * | 2021-01-26 | 2023-04-18 | 西安交通大学 | Water treatment system based on SBR reactor and treatment method thereof |
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