Wastewater treatment device and method of sequencing batch A/O (Anaerobic/Oxic) linked system for realizing partial nitrification of wastewater

A technology of short-range nitrification and linkage system, which is applied in the field of wastewater treatment devices of sequencing batch A/O linkage system, can solve the problems of complex operation procedures and many control parameters, and achieve the effects of precise control, simple process operation flow and easy operation.

Inactive Publication Date: 2014-10-22

吕慧 +1

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AI-Extracted Technical Summary

Problems solved by technology

The existing short-cut nitrification methods have the disadvantages of many control parameters, complicated operation p...

Abstract

The invention particularly relates to a wastewater treatment device and method of a sequencing batch A/O (Anaerobic/Oxic) linked system for realizing partial nitrification of wastewater. The device is provided with an adjusting pool and an SBR (Sequencing Batch Reactor) reaction pool, wherein the SBR reaction pool is divided in an anaerobic region and an oxic region. The method for treating wastewater by using the wastewater treatment device specifically comprises the following steps that (1) wastewater enters into the adjusting pool; (2) wastewater in the adjusting pool is pumped into the anaerobic region of the SBR reaction pool through a water inlet pump for denitrification; and (3) a water flow in the anaerobic region of the SBR reaction pool overflows to the oxic region of the SBR reaction pool for linked water inlet; the oxic region of the SBR reaction pool adopts an operating mode of SBR for partial nitrification; in the water inlet stage of the oxic region of the SBR reaction pool, muddy water is simultaneously returned to the anaerobic region, backflow is stopped after water inflow in the oxic region is stopped, and effluent in the anaerobic region is overflowed to the oxic region, and the whole process is circulated like this. The carbon source in wastewater is fully used to denitrify in the anaerobic region of the SBR reaction pool.

Application Domain

Treatment with aerobic and anaerobic processes

Technology Topic

Sequencing batch reactorBackflow +4

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Examples

Experimental program(2)

Example Embodiment

[0057] Example 1

[0058] Such as figure 1 As shown, a sequential batch type A/O linkage system wastewater treatment device for short-cut nitrification of wastewater is provided with a regulating tank 1 and SBR reaction tanks 2, 3, and the SBR reaction tanks 2, 3 include SBR reaction tanks anoxic Zone 2 and SBR reaction tank aerobic zone 3;

[0059] The regulating tank 1 is connected to the anoxic zone 2 of the SBR reaction tank through the water inlet pump 1.2 and the first liquid flow meter 1.1 in turn;

[0060] The anoxic zone 2 of the SBR reaction tank is connected to the aerobic zone 3 of the SBR reaction tank through an overflow tank 2.4;

[0061] An aeration pipe 3.5 is provided at the bottom of the aerobic zone 3 of the SBR reaction tank, and the aeration pipe 3.5 is connected to an aerator 3.9 through a gas flow meter 3.8;

[0062] There is a decanter 3.7 inside the aerobic zone 3 of the SBR reaction tank;

[0063] The bottom of the aerobic zone 3 of the SBR reaction tank is in turn connected with the reflux pump 3.10 and the second liquid flow meter 3.12 and the bottom of the anoxic zone 2 of the SBR reaction tank through the return pipeline 3.11;

[0064] The adjusting tank 1 is provided with a first stirrer 1.3 and a heating device 1.4 inside;

[0065] The volume ratio of the anoxic zone 2 of the SBR reaction tank and the aerobic zone 3 of the SBR reaction tank is 1: (3-5);

[0066] The said SBR reaction tank anoxic zone 2 is provided with a second stirrer 2.3, a first pH meter 2.1 and an ORP meter 2.2;

[0067] The aerobic zone 3 of the SBR reaction tank is provided with a third stirrer 3.1, a second pH meter 3.2, a DO meter 3.3, a liquid level sensor 3.4 and a temperature sensor 3.6 inside;

[0068] Such as figure 2 As shown, the first pH meter 2.1, the second pH meter 3.2, the DO meter 3.3, the ORP meter 2.2, the temperature sensor 3.6, the first liquid flow meter 1.1, the second liquid flow meter 3.12, the liquid level sensor 3.4, the gas Flowmeter 3.8 is connected with PLC controller respectively;

[0069] The PLC controller is connected with a computer, receives digital signals through the computer and outputs control signals; the PLC controller is respectively connected with the water inlet pump 1.2, the aerator 3.9, the first stirrer 1.3, the second stirrer 2.3, and the second stirrer respectively. Three stirrer 3.1, heating device 1.4, decanter 3.7, reflux pump 3.10 are connected.

[0070] Applying the above-mentioned method for processing wastewater by a sequential batch A/O linkage system wastewater treatment device for short-range nitrification of wastewater ( image 3 ), including the following specific steps:

[0071] (1) Use nitrified sludge as inoculation sludge to inject the aerobic zone 3 and anoxic zone 2 of the SBR reaction tank; turn on the first agitator 1.3 of the regulating tank 1, and fill the wastewater into the regulating tank 1;

[0072] (2) The wastewater in the regulating tank 1 is pumped into the anoxic zone 2 of the SBR reaction tank through the inlet pump 1.2, and the second agitator 2.3 of the anoxic zone 2 of the SBR reaction tank is turned on to perform denitrification;

[0073] (3) When the water flow in the anoxic zone 2 of the SBR reaction tank begins to overflow to the aerobic zone 3, use SBR operation to start the aerobic zone 3 of the SBR reaction tank to perform short-range nitrification:

[0074] ①Water-intake-aeration (reaction) stage: unrestricted aeration-intermittent water-intake method is used to overflow the anoxic zone 2 of the SBR reaction tank through the overflow tank 2.4 to the aerobic zone 3. Turn on the third agitator 3.1 and start the reflux pump 3.10 between the aerobic zone 3 and the anoxic zone 2 of the SBR reaction tank; in this process, the second pH meter 3.2 of the aerobic zone 3 of the SBR reaction tank is used to monitor the inflow of the anoxic zone 2 to make The pH of the aerobic tank 3 of the SBR reaction tank is maintained at 6.5~7.9; the DO in the aerobic zone 3 of the SBR reaction tank is maintained at ﹥1mg/L; the reflux ratio is 3, which can be fine-tuned according to the actual situation;

[0075] ②Subsequent aeration stage: When the water inflow reaches or exceeds the set value of the liquid level, stop the water inflow but continue aeration;

[0076] ③Precipitation stage: After the subsequent aeration stage, stop the third agitator 3.1, turn off the reflux pump 3.10, and proceed with precipitation;

[0077] ④Drainage stage: monitor and control the drainage by liquid level sensor 3.4 and use decanter 3.7;

[0078] ⑤The SBR reaction tank enters the next cycle: Repeat steps ①, ②, ③ and ④, and the hydraulic retention time is gradually reduced from 2d to 1d;

[0079] The wastewater is high ammonia nitrogen wastewater, and the NH4 in the high ammonia nitrogen wastewater + -N concentration is greater than 500mg/L, BOD 5 /TN is less than 3~5;

[0080] The high ammonia nitrogen wastewater is preferably kitchen waste digestion liquid, landfill leachate, sludge digestion supernatant, food industry wastewater, livestock wastewater, and chemical wastewater;

[0081] In step (3), the temperature of the aerobic zone 3 of the SBR reaction tank is 30-40°C, when the temperature is lower than 30°C, the heating device 1.4 of the conditioning tank is started, and when the temperature is higher than 40°C, the heating device of the conditioning tank is stopped;

[0082] In step (3), the temperature of the aerobic zone 3 of the SBR reaction tank is preferably 35°C; when the temperature is lower than 35°C, the heating device 1.4 of the conditioning tank is started, and when the temperature is higher than 35°C, the heating device of the conditioning tank is stopped;

[0083] The non-restrictive aeration mentioned in step (3) ① means that the aeration is carried out in the entire water-aeration (reaction) stage;

[0084] The method of intermittent water inflow described in step (3) ① is that the pH of the aerobic zone of the SBR reaction tank is maintained at 6.5-7.9. When the pH of the aerobic zone of the SBR reaction tank is lower than 6.5-7.9, the SBR reaction tank is activated When the pH of the aerobic tank of the SBR reaction tank is higher than 6.5~7.9, stop the water inflow to the anoxic zone of the SBR reaction tank;

[0085] The method of intermittent water inflow described in step (3) (1) is preferably that the pH of the aerobic zone of the SBR reaction tank is maintained at 6.8-7.5; when the pH of the aerobic tank of the SBR reaction tank is lower than 6.8-7.5, the SBR reaction tank is activated Water inflow in the oxygen zone; when the pH in the aerobic zone of the SBR reaction tank is higher than 6.8-7.5, stop the water inflow in the anoxic zone in the SBR reaction tank;

[0086] The operation time of the subsequent aeration stage described in step (3) ② is 30min~3h, and the specific reflection time depends on the specific; this stage is the end of the nitrosation reaction, the alkalinity is consumed, and the pH drops to the lowest and stabilizes;

[0087] The operation time of the precipitation stage described in step (3) ③ is 30-60 minutes.

Example Embodiment

[0088] Example 2

[0089] The wastewater treatment device and treatment method of the sequential batch A/O linkage system for realizing short-range nitrification of wastewater are used to treat wastewater, wherein the size of the regulating tank is B×H×L=470×500×440cm, and the total volume is 103,400 L. The size of the anoxic zone of the SBR reaction tank is 470×500×440cm, and the effective volume is 100,000L; the size of the aerobic zone is 470×500×1540cm, and the effective volume is 350,000L.

[0090] Take the landfill leachate from Shenzhen Xiaping Solid Waste Landfill, its pH is 8.01~8.65, NH 4 + -N concentration is as high as 1500~3000mg/L, BOD 5 /TN is less than 3-5, which is a typical wastewater with high ammonia nitrogen concentration and low carbon to nitrogen ratio.

[0091] (1) The nitrified sludge from Shenzhen Xiaping Leachate Treatment Plant was used as inoculation sludge to be injected into the aerobic and anoxic areas of the SBR reaction tank, and the sludge concentration was 2500kg MLSS/m 3; Turn on the first agitator (300 revolutions/h) of the adjustment tank, and load the landfill leachate into the adjustment tank;

[0092] (2) The wastewater in the regulating tank is pumped into the anoxic zone of the SBR reaction tank through the inlet pump, and at the same time the second agitator (300 revolutions/h) in the anoxic zone of the SBR reaction tank is turned on for denitrification;

[0093] (3) When the anoxic zone of the SBR reaction tank overflows, use SBR operation to start the aerobic zone of the SBR reaction tank to perform short-range nitrification:

[0094] ①Water-intake-aeration (reaction) stage: take the method of unrestricted aeration-intermittent water-intake to overflow the water in the anoxic zone of the SBR reaction tank to the aerobic zone, turn on the third agitator (300 rpm) and Start the reflux pump between the aerobic zone and the anoxic zone of the SBR reaction tank (reflux ratio is 3); in this process, monitor the inflow of the anoxic zone through the pH meter in the aerobic zone of the SBR reactor: when the SBR reaction tank is good If the pH of the oxygen zone is lower than 6.8~7.5, start the inflow of the anoxic zone of the SBR reaction tank. When the pH of the aerobic zone of the SBR reaction tank is higher than 6.8~7.5, stop the inflow of the anoxic zone of the SBR reaction tank; The temperature of the aerobic zone is 30~35℃. When the temperature is lower than 30℃, the heating equipment of the conditioning tank will be started. When the temperature is higher than 35℃, the heating equipment of the conditioning tank will be stopped; the DO in the system is maintained at ﹥1mg/L ;

[0095] ②Subsequent aeration stage: When the water inflow reaches or exceeds the set value of the liquid level, stop the water inflow but continue aeration; in this stage, as the nitrosation reaction ends, the alkalinity is consumed, and the pH drops to a minimum and stabilizes to 2. Time is 1h;

[0096] ③Sedimentation stage: After the subsequent aeration stage, stop the third agitator, turn off the reflux pump, and proceed with precipitation for 30 minutes;

[0097] ④Drainage is controlled by a decanter through liquid level sensor monitoring;

[0098] ⑤The SBR reaction tank enters the next cycle: Repeat steps ①, ②, ③ and ④, and the hydraulic retention time is gradually reduced from 2d to 1d.

[0099] Figure 4 It is a cycle of pH and DO change trends in the aerobic zone of the SBR reaction tank when the system is operating stably in this embodiment. Figure 5 It is the FNA and FA change trend diagram of one cycle in the aerobic zone of the SBR reaction tank when the system is operating stably in this embodiment. It can be seen from the figure that in one operation cycle of the aerobic zone of the SBR reaction tank, the concentrations of FNA and FA are 0.2-2.8 mg/L and 0.02-1.7 mg/L, respectively. Among them, the highest FA concentration of 1.7 mg/L did not completely inhibit NOB; the lowest FNA concentration of 0.2 mg/L was far greater than the complete inhibitory concentration of NOB. Therefore, FNA is the key to the successful realization of nitrosation in this system. At the beginning and end of each SBR operating cycle, the FNA concentration was greater than 2 mg/L, which obviously inhibited the growth of AOB. This is consistent with the change trend of DO concentration, indicating that AOB is completely inhibited, nitrification is temporarily stopped, and DO is almost not consumed, so DO abruptly increases at the beginning and end of each SBR operating cycle.

[0100] After the system has been running for 1 month, the operation effect is stable. The experimental results show that: the aerobic zone of the SBR reaction tank enters water NH 4 + -N load ALR up to 3kg NH 4 + -N/m 3 d, NO 2 --N accumulation rate is as high as 95%. The specific incoming and outgoing water quality of the system is shown in Table 1:

[0101] Table 1 Comparison of water quality parameters of incoming and outgoing water from wastewater treatment equipment of the sequencing batch A/O linkage system for short-cut nitrification of wastewater

[0102]

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Owner:QINGHAI UNIVERSITY

Wastewater treatment device and method of sequencing batch A/O (Anaerobic/Oxic) linked system for realizing partial nitrification of wastewater

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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