A treatment method and treatment system for ammonium-containing organic waste liquid

Abstract

The application discloses a kind of ammonium-containing organic waste liquid biological treatment system and its processing method, the application can degrade the toxic ammonium-containing organic waste liquid into harmless ammonia nitrogen, and further converted into nitrogen, conversion rate is greater than 99%, effectively solve the problem of refractory waste liquid treatment.The application is provided with flora selector and low-pressure sludge selector, flora selector is used to screen and enrich special dominant flora, and the abundance of flora is improved;Low-pressure sludge selector realizes the separation of active flora and aging flora under low-pressure hydraulic condition, avoids floc breaking, and enhances sludge settling performance.The system retains dominant flora through hydraulic cyclone effect, promotes the formation of granulated floc with good settling property, while effectively removes aging and dead bacteria, realizes effect improvement, sludge reduction and stable operation.The application not only improves the treatment effect, but also significantly reduces sludge disposal cost, and has high engineering application value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of organic waste liquid treatment, and in particular to a treatment method and a treatment system for ammonium-containing organic waste liquid. BACKGROUND

[0002] In the manufacturing process of electronic chips, semiconductors and liquid crystal panels, photoetching and developing are key process steps. The purpose of photoetching is to expose the photoresist coated on the wafer surface according to the design requirements, and the exposed part of the photoresist is modified. The purpose of developing is to dissolve the part of the photoresist modified by exposure in the developing solution, so as to obtain the required circuit pattern.

[0003] Tetramethylammonium hydroxide (TMAH) as the core component of the developing solution, due to its acute toxicity and difficult degradation characteristics, the toxicity of TMAH inhibits the activity of microorganisms, causing the collapse of the biochemical system, posing a serious challenge to the traditional biochemical treatment system.

[0004] At present, there are the following technical bottlenecks in the treatment of TMAH-containing and other difficult-to-degrade organic ammonium waste liquid and the optimization of biochemical systems:

[0005] I. Defects of difficult-to-degrade organic ammonium waste liquid treatment technology

[0006] 1. Incineration process: Although it can decompose TMAH, the carbon emission is high, which does not meet the green and low-carbon requirements.

[0007] 2. Advanced catalytic oxidation process: It relies on a large amount of reagents and energy input, and the operation cost is high, and secondary pollution may be caused.

[0008] 3. Anaerobic biological technology: The equipment investment is large, the sludge settling performance is poor, the biogas production is high, there is a safety risk, and the tolerance to TMAH is limited.

[0009] II. Problems of bacterial flora screening and sludge settling in biochemical system

[0010] 1. Difficulty in retaining dominant bacteria:

[0011] The conventional sludge discharge method is rough, which leads to the loss of special dominant bacteria, the competition for resources by residual aging and non-dominant bacteria, and the reduction of system treatment efficiency.

[0012] The high-pressure cyclone technology has high energy consumption and easily damages the sludge floc, which aggravates the deterioration of the settling performance; the external injection of bacterial agent has high cost and weak resistance to load.

[0013] 2. Poor sludge settling performance:

[0014] The addition of chemical reagents (such as PAC and PFS) increases the operation cost and sludge production; the introduction of inorganic impurities by the micro-sand ballast technology requires the use of PAM flocculation with potential toxicity.

[0015] MBR technology has high risk of membrane fouling and high maintenance cost.

[0016] III. Limitations of sludge granulation technology

[0017] 1. Crystal nucleus induction method: foreign impurities interfere with the treatment process of the stock solution, affecting the water quality.

[0018] 2. Hydraulic control method: the operating conditions are harsh, and it is difficult to accurately control in actual projects.

[0019] Therefore, it is urgent to develop an efficient, low-carbon and low-cost integrated technology that can not only specifically degrade toxic organic ammonium such as TMAH, but also optimize the sludge bacterial community structure and improve the settling performance, thereby breaking through the processing bottleneck of the existing biochemical system. SUMMARY

[0020] The purpose of the present application is to provide a.

[0021] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0022] A treatment method for ammonium-containing organic waste liquid, comprising the following steps:

[0023] Step S1: Microbial selection and strengthening: control the solution oxygen in the microbial selection and strengthening reactor at 0.5-3 mg / L, and control the sludge concentration at 4500-6500 mg / L, and based on the TMAH gradient concentration 500-4000 mg / L, domesticate the activity of special TMAH ammoniation bacteria;

[0024] 10%-25% of the water volume of the TMAH waste liquid to be treated is introduced into the microbial selection and strengthening reactor; nutrient agents and enzymatic agents are added, and the special TMAH ammoniation bacteria after domestication form a specific detoxification enzyme system;

[0025] Step S2: Ammoniation reaction: control the dissolved oxygen in the ammoniation reactor at 0.5-2 mg / L, and control the sludge concentration at 3500-6000 mg / L, introduce the specific detoxification enzyme system after domestication into the ammoniation reactor, and convert the ammonium-containing organic matter into non-toxic ammonia nitrogen through step-by-step demethylation reaction, the TMAH concentration of the waste liquid is 500-1500 mg / L, and during the reaction process, a three-phase mixed liquid is formed in the ammoniation reactor;

[0026] Step S3: Bacterial community screening: the three-phase mixed liquid is sent into a bacterial community screening device, and the dense ammoniation bacterial particle floc is settled and backflowed to the microbial selection and strengthening reactor for cyclic domestication, and the light inert nitrifying bacteria are introduced into the subsequent nitrification reactor;

[0027] Step S4: nitration reaction: the dissolved oxygen in the nitration reactor is controlled at 0.5-3 mg / L; the TMAH organic nitrogen in the TMAH wastewater is completely converted into ammonia nitrogen in the ammoniation reactor in step S2, and when entering the nitration reactor, the concentration of the TMAH waste liquid is ≤10-50 mg / L; the nitration bacteria are no longer inhibited; the originally inhibited free-state inert nitration bacteria separated by the bacterial population selector are reactivated in the nitration reactor to produce nitrate nitrogen, which acts together with the nitration bacterial population in the nitration reactor to improve the nitration rate of ammonia nitrogen and the overall nitrogen removal efficiency of the system;

[0028] Step S5: denitrification reaction: the dissolved oxygen in the denitrification reactor is controlled at 0.5 mg / L or below under anoxic conditions, and under the participation of an additional carbon source or easily degradable organic wastewater, the nitrate nitrogen is converted into nitrogen gas, thereby further reducing the total nitrogen concentration of the effluent;

[0029] Step S6: sludge screening and backflow: in the low-pressure sludge screen, high-activity sludge is separated from aged sludge by low-pressure cyclonic separation using an inlet water pressure of 1-2 m, the high-activity sludge is collected through an activated sludge collection tank and backflows to the front end of the nitration reactor, the aged sludge enters a settler for sedimentation, the supernatant after sedimentation backflows or is discharged, and the aged sludge after sedimentation is periodically discharged from the bottom of the settler.

[0030] Preferably, the nutrient agent comprises Fe 2+ - the humic acid complex is used as an electron shuttle to construct a buffer adaptation system under a TMAH concentration gradient of 50-2000 mg / L, to reduce the toxic effects of quaternary ammonium cations and methyl radicals on the bacterial population while improving the resistance of the bacterial population, to screen resistant strains, and to realize directional bacterial population domestication and stress-resistant gene mining;

[0031] The enzymatic agent uses added ions and enzyme-promoting trace elements to promote the transmembrane transport of TMAH and activate the expression of intracellular TMAH demethylase, thereby improving the degradation rate of the TMAH ammoniating bacterial population.

[0032] Preferably, based on the total weight of the nutrient agent, the nutrient agent comprises FeSO4 at a content of 8-20 wt%, potassium fulvate at a content of 3-8 wt%, KH2PO4 at a content of 2-5 wt%, and the rest is water;

[0033] Based on the total weight of the enzymatic agent, the enzymatic agent comprises ZnSO4 at a content of 3.2-8.2 wt%, CuSO4 at a content of 0.2-1.5 wt%, yeast extract at a content of 0.5-1.5 wt%, vitamin B at a content of 0.1-0.5 wt%, urea at a content of 10-20 wt%, and the rest is water.

[0034] The application also provides a treatment system for a treatment method of an ammonium-containing organic waste liquid, comprising, in sequence, a microbial selection and strengthening reactor, an ammoniation reactor, a microbial population filter, an overflow sludge collection tank 4, a nitrification reactor, a denitrification reactor, a low-pressure sludge filter, an activated sludge collection tank, and a settler.

[0035] The microbial selection and strengthening reactor is used for selection and domestication and strengthening of special TMAH ammoniating microbial populations under a TMAH concentration gradient condition, and nutrients and enzyme promoters are added to improve the activity of the microbial populations.

[0036] The ammoniation reactor is connected with the microbial selection and strengthening reactor and is used for generating ammonia nitrogen from TMAH through step-by-step demethylation.

[0037] The microbial population filter is used for separating TMAH ammoniating bacteria with high specific gravity from nitrifying bacteria with low specific gravity in a mixed liquid, and the TMAH ammoniating bacteria are returned to the microbial selection and strengthening reactor through a return pipeline, and the nitrifying bacteria are sent to a subsequent reactor.

[0038] The overflow sludge collection tank 4 is used for collecting sludge overflowed from the microbial population filter and conveying the sludge to a downstream.

[0039] The nitrification reactor is used for converting ammonia nitrogen generated by the ammoniation reactor into nitrate nitrogen under aerobic conditions.

[0040] The denitrification reactor is connected with the nitrification reactor and is used for converting nitrate nitrogen into nitrogen gas under the participation of a carbon source.

[0041] The low-pressure sludge filter is used for separating high-activity microbial populations from aged microbial populations under low-pressure cyclone conditions.

[0042] The activated sludge collection tank is used for collecting and returning high-activity sludge to the front end of the nitrification reactor.

[0043] The settler is used for precipitating the separated aged light sludge and then discharging water and sludge.

[0044] Preferably, the microbial population filter comprises a straight cylinder portion, internal guide vanes, a water collecting hopper, a sludge inlet pipe, a water distribution pipe, and a sludge outlet pipe.

[0045] The straight cylinder portion is a cylindrical body structure.

[0046] The internal guide vanes are arranged in the straight cylinder portion through guide vane fixing shafts, are located above the water distribution pipe, and are coaxially arranged with the straight cylinder portion and the water distribution pipe, and are used for guiding the upward water flow into a cyclone state, so that the high-specific-gravity sludge sinks along the wall and the low-specific-gravity sludge floats up.

[0047] The guide vane fixing shaft is arranged on the central axis of the straight cylinder portion and fixedly connected with the straight cylinder portion at both ends, and is used for fixing and supporting the internal guide vanes;

[0048] Each of the internal guide vanes is an integral body, and the two side edges of the internal guide vane are respectively welded and fixed with the inner wall of the straight cylinder portion and the outer wall of the fixing shaft. The inclination angle of each of the internal guide vanes is less than 30°, and the height of the internal guide vane accounts for 40% to 60% of the height of the straight cylinder portion.

[0049] The water collecting hopper is arranged in the straight cylinder portion, coaxial with the internal guide vanes and located above the internal guide vanes, and is used for collecting the light sludge and guiding the light sludge into the nitrification reactor;

[0050] The sludge inlet pipe is arranged at the bottom of the straight cylinder portion and is used for guiding the three-phase mixed liquid into the microbial population selector;

[0051] The water distribution pipe is connected to the sludge inlet pipe, the water distribution pipe is funnel-shaped with a wide upper part and a narrow lower part, and is used for uniformly distributing the three-phase mixed liquid into the straight cylinder portion. The sludge outlet pipe is arranged at the bottom of the straight cylinder portion and is backflow-connected to the microbial selection and enhancement reactor, and is used for backflowing the collected heavy sludge to the microbial selection and enhancement reactor.

[0052] Preferably, the low-pressure sludge selector further comprises a sludge settling hopper, the sludge settling hopper is arranged at the bottom end of the internal guide vane and located outside the water distribution pipe, and is used for collecting the water distributed by the water distribution pipe to the internal guide vane. Preferably, the low-pressure sludge selector comprises a water inlet, a straight cylinder section, a tapered section, an overflow pipe and a underflow port;

[0053] The water inlet is arranged on the side wall of the straight cylinder section and is used for introducing the mixed liquid of the denitrification reactor into the straight cylinder section;

[0054] The straight cylinder section is in a cylindrical structure, and the tapered section is arranged below the straight cylinder section in a conical structure and connected with the straight cylinder section;

[0055] The overflow pipe is inserted into the straight cylinder section, the depth of the insertion of the overflow pipe into the straight cylinder section is 50% to 80% of the height of the straight cylinder section, the lower end of the overflow pipe is located in the middle region of the straight cylinder section, the upper end of the overflow pipe is higher than the top of the straight cylinder section, and the overflow pipe is connected with the settler through a flange. An annular cyclone passage is formed between the outer wall of the overflow pipe and the inner wall of the straight cylinder section;

[0056] The underflow port is arranged at the bottom of the tapered section and extends into the activated sludge collecting tank, and is used for collecting the activated sludge settled from the tapered section;

[0057] The mixed solution is in the process of forming a cyclone, and the light aging bacteria group is migrated to the center with the water flow and finally flows out from the upper part of the overflow pipe; the quality-dense active bacteria group is settled in the cone section and enters the underflow port.

[0058] Preferably, a tubular static mixer is further included, which is arranged in front of the water inlet and used for dispersing the aging bacteria attached to the surface of the floc before the water is introduced, so that the water is fully mixed and dispersed before entering the straight cylinder section.

[0059] Preferably, two water inlets are symmetrically arranged on the two sides of the straight cylinder section, so as to enhance the cyclone effect under low pressure.

[0060] Preferably, a stirring device is arranged in the denitrification reactor and connected with a driving motor, so as to prevent the sludge in the denitrification reactor from being deposited.

[0061] Compared with the prior art, the present application has the following beneficial effects:

[0062] (1) The present application is aimed at the problem that the organic waste liquid containing ammonium is highly toxic and difficult to treat, and the present application uses a microbial selection and strengthening reactor combined with TMAH gradient domestication and auxiliary factor enzyme system strengthening to screen and strengthen special TMAH ammoniating bacteria groups, so as to realize efficient conversion of TMAH in the waste liquid into non-toxic ammonia nitrogen.

[0063] (2) The present application is aimed at the problem that the microorganisms in the existing biochemical system cannot effectively screen dominant bacteria, and the present application uses a bacteria group selector and a low-pressure sludge selector to separate and return the high-activity bacteria groups from the inhibited or aged bacteria groups by using the difference in sludge density and settling performance, so as to ensure the stable growth and efficient reaction of the dominant bacteria groups in the ammoniation and nitrification sections.

[0064] (3) The present application is aimed at the problem that the sludge settling performance of the existing system is insufficient, and the present application controls the sludge concentration, dissolved oxygen and cyclone screening technology to make the active bacteria groups form quality-dense granular flocs and improve the settling performance.

[0065] (4) The present application is aimed at the problem that the sludge granulation effect is poor, and the present application strengthens the granulation and floc formation ability of the bacteria groups by microbial domestication, bacteria group selection and auxiliary factor promotion of extracellular polymeric substance secretion, so as to improve the sludge stability and reaction efficiency.

[0066] (5) The present application is aimed at the problem that the sludge discharge amount is large and the disposal cost is high, and the present application uses low-pressure cyclone separation and active sludge return technology to recycle the high-activity bacteria groups and regularly discharge the aged light sludge, so as to significantly reduce the total sludge discharge amount and reduce the sludge disposal cost. BRIEF DESCRIPTION OF DRAWINGS

[0067] Figure 1A structural schematic diagram of a treatment system for a treatment method of an ammonium-containing organic waste liquid provided by the present application;

[0068] Figure 2 A structural schematic diagram of a low-pressure sludge screen in a treatment system for a treatment method of an ammonium-containing organic waste liquid provided by the present application; Figure 1 A structural schematic diagram of a microflora screen;

[0069] Figure 3 A structural schematic diagram of a low-pressure sludge screen in a treatment system for a treatment method of an ammonium-containing organic waste liquid provided by the present application; Figure 1 A structural schematic diagram of a low-pressure sludge screen in a treatment system for a treatment method of an ammonium-containing organic waste liquid provided by the present application;

[0070] Figure 4 A structural schematic diagram of a low-pressure sludge screen in a treatment system for a treatment method of an ammonium-containing organic waste liquid provided by the present application;

[0071] Figure 5 A flow chart of a treatment system for a treatment method of an ammonium-containing organic waste liquid provided by the present application.

[0072] The serial numbers in the figure are as follows:

[0073] 1, microorganism selection and strengthening reactor; 2, ammoniation reactor; 3, microflora screen; 31, straight cylinder part; 32, internal guide vane; 33, water collecting hopper; 34, sludge settling hopper; 35, guide vane fixing shaft; 36, sludge inlet pipe; 37, water distribution pipe; 38, sludge outlet pipe; 4, overflow sludge collecting tank; 5, nitrification reactor; 6, denitrification reactor; 7, low-pressure sludge screen; 71, water inlet; 72, tubular static mixer; 73, straight cylinder section; 74, cone section; 75, overflow pipe; 76, underflow port; 8, activated sludge collecting tank; 9, settler; 10, stirring device. DETAILED DESCRIPTION

[0074] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0075] As Figure 5 shown, the present application discloses a treatment method of an ammonium-containing organic waste liquid, including the following steps:

[0076] Step S1: microorganism selection and strengthening: the solution oxygen in the microorganism selection and strengthening reactor 1 (aerobic tank one) is controlled at 0.5-3 mg / L, the sludge concentration is controlled at 4500-6500 mg / L, and the activity of the special TMAH ammoniating microflora is domesticated based on the TMAH gradient concentration 500-4000 mg / L;

[0077] 10%~25% of the water volume of the TMAH waste liquid to be treated is introduced into the microorganism selection and strengthening reactor 1; a special microorganism growth nutrient agent and an enzyme accelerator are added to provide the microorganism with nutrient elements and trace elements and to enhance the activity of the enzyme system in the microorganism; the domesticated special TMAH ammoniating bacteria form a specific detoxification enzyme system;

[0078] Step S2: Ammoniation reaction: under the conditions that the dissolved oxygen in the ammoniation reactor 2 (the second aerobic tank) is controlled at 0.5~2 mg / L and the sludge concentration is controlled at 3500~6000 mg / L, the domesticated specific detoxification enzyme system is introduced into the ammoniation reactor 2, and the ammonium-containing organic matter is finally converted into non-toxic ammonia nitrogen by being gradually demethylated into trimethylamine TMA and dimethylamine DMA, the concentration of the waste liquid TMAH is 500~1500 mg / L, and in the reaction process, the ammoniation reactor 2 forms a three-phase mixed liquid composed of a liquid phase including the waste liquid and reaction products, a solid phase of suspended sludge particles, and a gas phase of aeration bubbles;

[0079] Step S3: Bacteria group screening: the three-phase mixed liquid is sent to the bacteria group screening device 3, and the cyclonic separation effect is used to settle and backflow the dense ammoniating bacteria particle floc to the microorganism selection and strengthening reactor 1 for cyclic domestication, and the light nitration bacteria are introduced into the downstream nitration reactor 5;

[0080] Step S4: Nitration reaction: the dissolved oxygen in the nitration reactor 5 (the third aerobic tank) is controlled at 0.5~3 mg / L; in step S2, the TMAH organic nitrogen in the TMAH waste water has been completely converted into ammonia nitrogen in the ammoniation reactor 2, and when entering the nitration reactor 5, the concentration of the TMAH waste liquid is ≤10~50 mg / L; the nitration bacteria are no longer inhibited; the original inhibited free-state nitration bacteria delivered by the bacteria group screening device 3 are reactivated to produce nitrate nitrogen in the nitration reactor 5, and the nitration rate of the ammonia nitrogen and the overall nitrogen removal efficiency of the system are improved by the joint action of the nitration bacteria group in the nitration reactor 5;

[0081] Step S5: Denitrification reaction: the dissolved oxygen in the denitrification reactor 6 (the anoxic tank) is controlled at an anoxic condition of 0.5 mg / L or below, and under the participation of an additional carbon source or easily degradable organic waste water, the nitrate nitrogen is converted into nitrogen gas, so as to further reduce the total nitrogen concentration of the effluent;

[0082] Step S6: Sludge screening and backflow: in the low-pressure sludge screening device 7, the high-activity sludge and the aged sludge are separated by the low-pressure cyclonic separation under the water inlet pressure of 1~2 m, the high-activity sludge is collected by the activated sludge collection tank 8 and backflows to the front end of the nitration reactor 5, the aged sludge enters the settler 9 for settlement, the supernatant after the settlement backflows or is discharged, and the aged sludge after the settlement is periodically discharged from the bottom of the settler 9.

[0083] Further, the nutritional agent includes FeSO4 in an amount of 8-20 wt%, potassium fulvate in an amount of 3-8 wt%, KH2PO4 in an amount of 2-5 wt%, and the rest is water, based on the total weight of the nutritional agent;

[0084] Fe 2+ - The humic acid complex is used as an electron shuttle to construct a buffer adaptation system under the concentration gradient of TMAH 50-2000 mg / L, to reduce the toxic effects of quaternary ammonium cations and methyl radicals on the bacterial flora, and to improve the toxicity resistance of the bacterial flora. Tolerant strains such as Pseudomonas and Mycobacterium are screened to realize directional bacterial domestication and stress-resistant gene mining.

[0085] The enzymatic agent includes ZnSO4 in an amount of 3.2-8.2 wt%, CuSO4 in an amount of 0.2-1.5 wt%, yeast extract in an amount of 0.5-1.5 wt%, vitamin B in an amount of 0.1-0.5 wt%, urea in an amount of 10-20 wt%, and the rest is water, based on the total weight of the enzymatic agent.

[0086] The enzymatic agent uses added ions and trace elements to promote TMAH transmembrane transport and activate intracellular TMAH demethylase expression, thereby improving the degradation rate of TMAH ammonifying bacteria.

[0087] Table 1 below shows the degradation effect of TMAH waste liquid.

[0088] Table 1

[0089]

[0090] Table 2 below shows the sedimentation performance improvement effect.

[0091] Table 2

[0092]

[0093] As Figure 1 shown, the embodiment also provides a treatment system for a treatment method of an ammonium-containing organic waste liquid, which includes, in sequence, a microbial selection and strengthening reactor 1 (an aerobic tank one), an ammoniation reactor 2 (an aerobic tank two), a bacterial flora selector 3, an overflow sludge collection tank 4, a nitrification reactor 5 (an aerobic tank three), a denitrification reactor 6 (an anoxic tank), a low-pressure sludge selector 7, an activated sludge collection tank 8, and a sedimentation device 9.

[0094] The microbial selection and strengthening reactor 1 is used to select and strengthen special TMAH ammonifying bacteria under the condition of a TMAH concentration gradient, and nutritional agents and enzymatic agents are added to improve the activity of the bacterial flora.

[0095] Ammoniation reactor 2 is connected to the microbial selection enhancement reactor 1 and is used to generate ammonia nitrogen from TMAH through a stepwise demethylation process.

[0096] Microbial screening device 3 is used to separate dense TMAH ammonifying bacteria and light nitrifying bacteria in the mixture. The TMAH ammonifying bacteria are returned to the microbial selection enhancement reactor 1 through the reflux pipeline, and the nitrifying bacteria are sent to the subsequent reactor.

[0097] Overflow sludge collection tank 4 is used to collect the sludge overflowing from the microbial screening device 3 and transport it downstream.

[0098] Nitrification reactor 5 is used to convert ammonia nitrogen produced by ammonification reactor 2 into nitrate nitrogen under aerobic conditions.

[0099] The denitrification reactor 6 is connected to the nitrification reactor 5 and is used to convert nitrate nitrogen into nitrogen gas with the participation of a carbon source.

[0100] The low-pressure sludge screener 7 is used to separate highly active bacteria from aged bacteria under low-pressure cyclone conditions.

[0101] Activated sludge collection tank 8 is used to collect and return highly activated sludge to the front end of nitrification reactor 5;

[0102] Sedimentation tank 9 is used for settling and draining water and sludge after separating aged light sludge.

[0103] Furthermore, in this embodiment, the microbial screening device 3 is used to retain highly active special TMAH ammonifying bacteria in the ammoniation section for effective TMAH degradation, and to separate poorly active TMAH ammonifying bacteria and inhibited nitrifying bacteria, which then flow into the subsequent reactor.

[0104] like Figure 2 As shown, in this embodiment, the microbial screening device 3 includes a straight cylindrical section 31, internal guide vanes 32, a water collecting hopper 33, a sedimentation hopper 34, a sludge inlet pipe 36, a water distribution pipe 37, and a sludge outlet pipe 38. The straight cylindrical section 31 adopts a cylindrical structure.

[0105] Each internal guide vane 32 is an integral unit. The two sides of the internal guide vane 32 are welded and fixed to the inner wall of the straight cylinder 31 and the outer wall of the fixed shaft, respectively. The inclination angle of each internal guide vane 32 is <30°, and the height of the internal guide vane 32 accounts for 40% to 60% of the height of the straight cylinder 31.

[0106] The guide vane fixing shaft 35 is set inside the straight cylinder section 31, above the water distribution pipe 37, and coaxially arranged with the straight cylinder section 31 and the water distribution pipe 37. It is used to guide the rising water flow into a swirling state, so that dense sludge sinks against the wall and light sludge gathers and floats.

[0107] The guide vane fixing shaft 35 is arranged on the central axis of the straight cylinder portion 31, and the two ends are fixedly connected with the straight cylinder portion 31, and is used for fixing and supporting the inner guide vane 32. The water collecting hopper 33 is arranged in the straight cylinder portion 31, coaxial with the inner guide vane 32 and located above the inner guide vane 32, and is used for collecting the light sludge and guiding the light sludge into the nitrification reactor 5.

[0108] The sludge sink 34 is arranged at the bottom end of the inner guide vane 32 and located outside the water distribution pipe 37, and is used for collecting the water distributed by the water distribution pipe 37 to the inner guide vane 32.

[0109] The sludge sink 34 is arranged at the bottom end of the inner guide vane 32 and located outside the water distribution pipe 37, and is used for collecting the water distributed by the water distribution pipe 37 to the inner guide vane 32.

[0110] The sludge sink 34 is arranged at the bottom end of the inner guide vane 32 and located outside the water distribution pipe 37, and is used for collecting the water distributed by the water distribution pipe 37 to the inner guide vane 32.

[0111] The specific working principle of the mixed liquid entering the bacteria population filter 3 is as follows:

[0112] Step S31: The mixed liquid enters and is distributed by the water distribution pipe 37.

[0113] The three-phase mixed liquid (liquid, gas and sludge) from the ammonification reactor 2 enters the bacteria population filter 3 through the sludge inlet pipe 36.

[0114] The mixed liquid is uniformly distributed to the bottom space of the straight cylinder portion 31 through the water distribution pipe 37, to provide uniform hydraulic conditions for subsequent cyclone separation.

[0115] Step S32: Cyclone formation and sludge grading

[0116] During the rising process of the mixed liquid, the low-speed cyclone is formed by the guidance of the inner guide vane 32.

[0117] Under the action of the cyclone, different sludge particles are graded according to the density difference:

[0118] The particle flocs (heavy sludge) formed by the special TMAH ammonification bacteria tend to the cylinder wall and gradually settle;

[0119] The inhibited nitrifying bacteria and part of the poor active ammonification bacteria (light sludge) float with the water flow.

[0120] Step S33: Settlement and reflux of heavy sludge

[0121] The sinking heavy particle flocs are concentrated to the sludge sink 34.

[0122] The high-activity TMAH ammonifying bacteria population is enriched and recycled by flowing back to the microbial selection and strengthening reactor 1 through the sludge discharge pipe 38.

[0123] Step S34: floating and separation of light sludge

[0124] The floating light sludge is collected by the hopper 33 at the top of the straight section 31;

[0125] Subsequently, the sludge flows into the nitrification reactor 5 through the water inlet pipe, and the nitrification reaction is completed in the downstream reaction section.

[0126] Step S35: destination of inactivated or dead bacteria

[0127] During operation, part of the TMAH ammonifying bacteria may die or disintegrate to form loose and poorly settling flocs;

[0128] This part of the bacteria also enters the hopper 33 with the liquid flow and finally enters the downstream reactor with the light sludge, and is removed in the subsequent sludge discharge link.

[0129] Table 3 below shows the effect of the bacterial population filter 3.

[0130] Table 3

[0131]

[0132] Further, in the present embodiment, the low-pressure sludge filter 7 is used to separate the active bacterial population (nitrifying bacteria and denitrifying bacteria) from the aged bacterial population. The separation process is based on the difference in density and floc structure between the two, and is realized by forming stable hydraulic classification conditions through low-pressure cyclone.

[0133] As shown in Figure 3 and Figure 4 , the low-pressure sludge filter 7 includes a water inlet 71, a tubular static mixer 72, a straight section 73, a tapered section 74, an overflow pipe 75, and an underflow port 76.

[0134] The water inlet 71 is provided in two groups, each connected to the outlet of the denitrification reactor 6. The two groups of water inlets 71 are oppositely arranged on the side walls of the straight section 73, and are used to introduce the mixed liquid from the denitrification reactor 6 into the straight section 73 from two opposite directions.

[0135] Further, the tubular static mixer 72 is arranged at the front end of the water inlet, which is used to disperse the aged bacteria attached to the surface of the flocs before the water inlet, so that the water inlet is fully mixed and dispersed before entering the straight section 73.

[0136] The straight cylinder section 73 is in a cylindrical structure, and the conical section 74 is in a conical structure and is arranged below the straight cylinder section 73 and connected with the straight cylinder section 73 in an integrated structure to form a treatment area.

[0137] The overflow pipe 75 is inserted in the center of the straight cylinder section 73, and the insertion depth of the overflow pipe 75 in the straight cylinder section 73 is 50% to 80% of the height of the straight cylinder section 73. The lower end of the overflow pipe 75 is located in the middle area of the straight cylinder section 73, the upper end of the overflow pipe 75 is higher than the top of the straight cylinder section 73, and the overflow pipe 75 is fixed on the straight cylinder section 73 and connected with the settler 9 through a flange. An annular cyclone passage is formed between the outer wall of the overflow pipe 75 and the inner wall of the straight cylinder section 73. The mixed liquid of the denitrification reactor 6 is introduced into the straight cylinder section 73 from two opposite directions, and the mixed liquid in the two directions passes through the annular cyclone passage to form a cyclone. After the mixed liquid forms a cyclone in the straight cylinder section 73, it enters the conical section 74 and gradually shrinks. The activated sludge is dense and sinks along the conical wall.

[0138] The underflow port 76 is located at the bottom of the conical section 74 and extends into the activated sludge collection tank 8 to collect the activated sludge settled from the conical section 74.

[0139] During the cyclone formation process, the light-weighted aging bacteria group migrates to the center with the water flow and finally flows out from the upper part of the overflow pipe 75. The dense activated bacteria group settles in the conical section 74 and enters the activated sludge collection tank 8.

[0140] Further, in this embodiment, the water inlet 71 adopts two symmetrical settings on both sides of the straight cylinder section 73 to enhance the cyclone effect under low pressure conditions. The cyclone direction is determined according to the law of earth rotation: counterclockwise in the northern hemisphere and clockwise in the southern hemisphere. The water inlet is connected with the water inlet pipe flange, and the water inlet pipe can be a square pipe or a circular pipe. The inlet flow rate is controlled at 1-2 m / s.

[0141] The working principle of the low-pressure sludge selector 7 is as follows:

[0142] Step S71: water inlet and pretreatment

[0143] The mixed liquid is introduced into the straight cylinder section 73 through the water inlet 71 tangentially from the denitrification reactor 6.

[0144] The water inlet 71 is provided with two water inlets 71 which are opposite and staggered to enhance the cyclone effect. The flow direction is determined according to the law of earth rotation (counterclockwise in the northern hemisphere and clockwise in the southern hemisphere).

[0145] In front of the water inlet 71, the tubular static mixer 72 pretreats the mixed liquid to disperse the aging bacteria attached to the surface of the floc, and the water inlet is fully mixed.

[0146] Step S72: cyclone formation and bacteria group classification

[0147] In the straight section 73, the mixed liquid forms stable spiral flow.

[0148] The active bacteria group with high density and good cohesion migrates to the outer wall under the centrifugal force;

[0149] The aging bacteria group with low density and poor cohesion migrates to the center of the spiral flow.

[0150] Step S73: Strengthening separation in the conical section

[0151] After the mixed liquid enters the conical section 74, the spiral flow space gradually shrinks, and the water flow pressure field is enhanced.

[0152] The active bacteria group sinks along the conical wall, and the aging bacteria group migrates to the center, forming obvious classification.

[0153] Step S74: Sludge diversion

[0154] Active sludge: After settling in the conical section, it enters the active sludge collection tank 8 through the underflow port 76, and then flows back to the front end of the nitrification reactor for reaction.

[0155] Aging sludge: It flows out from the upper part of the overflow pipe 75 with the water flow, and enters the settler 9 for sedimentation and discharge.

[0156] In this embodiment, the bacteria group selector adopts a bottom-up water inlet method, while the low-pressure sludge selector adopts a top tangential water inlet method.

[0157] Secondly, there are obvious differences between the two in terms of separation objects and separation mechanisms:

[0158] The bacteria group selector 3 is mainly used for separating different types of bacteria groups. The special TMAH ammonifying bacteria group can tolerate and degrade toxic and refractory organic ammonium. This type of bacteria group is prone to mutual adhesion, forming dense bacterial flocs. Other conventional bacteria groups are in free and dispersed state due to the inhibition of organic ammonium. Due to the large density difference between the two types of bacteria groups, the bottom-up spiral flow method can effectively separate the special bacteria group from other bacteria groups while maintaining the structure of the special bacteria group flocs.

[0159] The low-pressure sludge screen 7 is mainly used for grading different states in the same bacterial flora, that is, separating activated sludge and aged sludge. Both the activated sludge and the aged sludge exist in the form of flocs, and the aged sludge is often attached to the surface of the activated sludge, and the density difference is relatively small. If an upward cyclone is used, effective separation is difficult to achieve due to insufficient centrifugal force. If a high-pressure cyclone is used, the centrifugal force is too large, which can easily break the activated flocs, making it more difficult to separate the aged sludge, and the severe disturbance can also reduce the settling performance of the sludge, resulting in sludge running and sludge running problems. The low-pressure sludge screen used in the present application works under low-pressure hydraulic conditions, which not only avoids floc breakage, but also realizes effective screening of aged sludge and activated sludge under the action of limited centrifugal force.

[0160] The bacterial flora screen 3 is suitable for selective separation between different bacterial flora, and the low-pressure sludge screen 7 is suitable for grading separation of new and old sludge in the same bacterial flora. Both have essential differences in structural design and functional positioning, and can form a complementary effect in the whole system to ensure the stability of the bacterial flora structure and the treatment efficiency.

[0161] Further, in the present embodiment, the denitrification reactor 6 is provided with a stirring device 10 connected to a driving motor, which is used to prevent the sludge in the denitrification reactor 6 from settling.

[0162] In summary, the beneficial effects of the present embodiment are as follows:

[0163] 1. The present application can effectively degrade the toxic ammonium-containing organic waste liquid into harmless ammonia nitrogen, and further convert the ammonia nitrogen into N2 with a conversion rate of >99%, solving the problem of difficult effective treatment of toxic ammonium-containing organic waste liquid.

[0164] 2. The bacterial flora screen used in the present application can screen and collect special dominant bacterial flora, improve the abundance of dominant bacterial flora, and solve the problem of ineffective screening of dominant bacterial species in the existing biochemical system.

[0165] 3. The bacterial flora screen and the low-pressure sludge screen used in the present application gradually screen bacterial flora with good settling function. With the increase of running time, the settling performance of the sludge will continue to improve, solving the problem of insufficient sludge settling performance in the existing biochemical system.

[0166] 4. The hydraulic cyclone method is used to screen the dominant bacterial flora. Under the hydraulic conditions of cyclone, the dominant bacterial flora adhere to each other and are finally retained in the reactor. With the increase of running time, this part of the bacterial flora gradually forms more comprehensive granular flocs, solving the problem of poor sludge granulation effect in the existing biochemical system.

[0167] 5、The present application adopts special low-pressure sludge screener to effectively separate aging and dead bacteria, retain high-activity bacteria groups in the system, discharge the aging and dead bacteria alone, improve the treatment effect, realize sludge reduction, reduce sludge disposal cost, and solve the problems of large sludge discharge and high sludge disposal cost of the existing biochemical system.

[0168] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0169] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0170] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes to the technical solution and inventive concept of the present application within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method for the treatment of an ammonium-containing organic waste liquid, characterized in that, It comprises the following steps: Step S1: Microbial selection and strengthening: the solution oxygen in the microbial selection and strengthening reactor (1) is controlled at 0.5-3 mg / L, the sludge concentration is controlled at 4500-6500 mg / L, and the activity of the special TMAH ammoniating bacteria group is domesticated based on the gradient concentration of TMAH of 500-4000 mg / L; 10%-25% of the water volume of the TMAH waste liquid to be treated is introduced into the microbial selection and strengthening reactor (1); nutrient agents and enzymatic agents are added, and the special TMAH ammoniating bacteria group after domestication forms specific detoxification enzyme systems; Step S2: Ammoniation reaction: the dissolved oxygen in the ammoniation reactor (2) is controlled at 0.5-2 mg / L, the sludge concentration is controlled at 3500-6000 mg / L, the domesticated specific detoxification enzyme systems are introduced into the ammoniation reactor (2), and the ammonium-containing organic matter is converted into non-toxic ammonia nitrogen through step-by-step demethylation reaction, the concentration of the waste liquid TMAH is 500-1500 mg / L, and a three-phase mixed liquid is formed in the ammoniation reactor (2) during the reaction process; Step S3: Bacterial group screening: the three-phase mixed liquid is sent into the bacterial group screening device (3), the upward cyclone flow state and cyclone separation are used to settle and backflow the dense ammoniating bacteria floc particles to the microbial selection and strengthening reactor (1) for cyclic domestication, and the light inert nitrifying bacteria not participating in the ammoniation reaction are introduced into the subsequent nitrification reactor (5); Step S4: Nitrification reaction: the dissolved oxygen in the nitrification reactor (5) is controlled at 0.5-3 mg / L; the TMAH organic nitrogen in the TMAH wastewater has been completely converted into ammonia nitrogen in the ammoniation reactor (2) in step S2, the TMAH waste liquid concentration is ≤10-50 mg / L when entering the nitrification reactor (5), and the nitrifying bacteria are no longer inhibited; the originally inhibited free-state inert nitrifying bacteria delivered from the bacterial group screening device (3) are reactivated in the nitrification reactor (5), and the nitrification rate of ammonia nitrogen and the overall nitrogen removal efficiency of the system are improved through the joint action of the nitrifying bacteria in the nitrification reactor (5); Step S5: Denitrification reaction: the dissolved oxygen in the denitrification reactor (6) is controlled under the anoxic condition of 0.5 mg / L or below, the nitrated nitrogen is converted into nitrogen gas under the participation of an external carbon source or easily degradable organic wastewater, and the total nitrogen concentration of the effluent is further reduced; Step S6: Sludge screening and backflow: in the low-pressure sludge screening device (7), the high-activity sludge is separated from the aged sludge by using the low-pressure cyclone under the water inlet pressure of 1-2 m, the high-activity sludge is collected through the activated sludge collection tank (8) and backflowed to the front end of the nitrification reactor (5), the aged sludge enters the settler (9) for settlement, the supernatant after settlement is backflowed or discharged, and the aged sludge after settlement is regularly discharged from the bottom of the settler (9).

2. The treatment method for an ammonium-containing organic waste liquid according to claim 1, characterized by, The nutritional agent adopts Fe 2+ - Furfuric acid complex as an electron shuttle, construct a buffer adaptation system under the concentration gradient of TMAH 500-4000 mg / L, reduce the toxic effects of quaternary ammonium cations and methyl radicals on the bacterial population, while improving the toxicity resistance of the bacterial population, screening resistant strains, and realizing directional bacterial domestication and stress-resistant gene mining; The enzymatic agent uses ion addition and trace enzyme-promoting elements to promote the transmembrane transport of TMAH and activate the expression of intracellular TMAH demethylation enzymes, thereby improving the degradation rate of the TMAH ammoniating bacteria group.

3. The treatment method for an ammonium-containing organic waste liquid according to claim 2, characterized by, The nutritional agent comprises FeSO4 in an amount of 8-20 wt%, potassium fulvate in an amount of 3-8 wt%, KH2PO4 in an amount of 2-5 wt%, and the rest is water, based on the total weight of the nutritional agent; The enzymatic agent comprises ZnSO4 in an amount of 3.2-8.2 wt%, CuSO4 in an amount of 0.2-1.5 wt%, yeast extract in an amount of 0.5-1.5 wt%, vitamin B in an amount of 0.1-0.5 wt%, urea in an amount of 10-20 wt%, and the rest is water, based on the total weight of the enzymatic agent.

4. A treatment system based on the treatment method according to any one of claims 1 to 3, characterized in that, The system comprises, in sequence, a microorganism selection and strengthening reactor (1), an ammoniation reactor (2), a microbial population filter (3), an overflow sludge collection tank (4), a nitrification reactor (5), a denitrification reactor (6), a low-pressure sludge filter (7), an activated sludge collection tank (8), and a settler (9); The microorganism selection and strengthening reactor (1) is used for selecting and strengthening special TMAH ammoniating bacteria under the condition of a TMAH concentration gradient, and adding a nutritional agent and an enzymatic agent to improve the activity of the bacteria; The ammoniation reactor (2) is connected with the microorganism selection and strengthening reactor (1) and is used for generating ammonia nitrogen by gradually demethylating TMAH; The microbial population filter (3) is used for separating TMAH ammoniating bacteria with high specific gravity from nitrifying bacteria with low specific gravity in a mixed liquid, and returning the TMAH ammoniating bacteria to the microorganism selection and strengthening reactor (1) through a reflux pipeline and sending the nitrifying bacteria to a subsequent reactor; The overflow sludge collection tank (4) is used for collecting sludge overflowing from the microbial population filter (3) and conveying the sludge to a downstream; The nitrification reactor (5) is used for converting ammonia nitrogen generated by the ammoniation reactor (2) into nitrate nitrogen under aerobic conditions; The denitrification reactor (6) is connected with the nitrification reactor (5) and is used for converting nitrate nitrogen into nitrogen gas under the participation of a carbon source; The low-pressure sludge filter (7) is used for separating high-activity bacteria from aging bacteria under the condition of low-pressure cyclone; The activated sludge collection tank (8) is used for collecting and returning high-activity sludge to the front end of the nitrification reactor (5); The settler (9) is used for precipitating separated aging light sludge and discharging water and sludge.

5. A treatment system for a treatment method of an ammonium-containing organic waste liquid according to claim 4, characterized by, The microbial population filter (3) comprises a straight cylinder portion (31), internal guide vanes (32), a water collecting hopper (33), a sludge inlet pipe (36), a water distribution pipe (37), and a sludge outlet pipe (38); The straight cylinder portion (31) is a cylindrical structure; The internal guide vanes (32) are arranged in the straight cylinder portion (31) through guide vane fixing shafts (35), are located above the water distribution pipe (37), and are coaxially arranged with the straight cylinder portion (31) and the water distribution pipe (37), and are used for guiding the upward water flow into a cyclone state, so that the high-specific-gravity sludge sinks along the wall and the light-specific-gravity sludge floats up. The guide vane fixing shaft (35) is arranged on the central axis of the straight cylinder portion (31) and is used for fixing and supporting the internal guide vanes (32); each of the internal guide vanes (32) is an integral whole, the two side edges of the internal guide vane (32) are welded and fixed with the inner wall of the straight cylinder portion (31) and the outer wall of the fixing shaft, and the inclination angle of each of the internal guide vanes (32) is less than 30°, the height of the internal guide vane (32) accounts for 40% to 60% of the height of the straight cylinder portion (31); The water collecting hopper (33) is arranged in the straight cylinder portion (31), coaxial with the internal guide vanes (32) and above the internal guide vanes (32), and is used for collecting the light sludge and guiding the light sludge into the nitrification reactor (5); The sludge inlet pipe (36) is arranged at the bottom of the straight cylinder portion (31) and is used for guiding the three-phase mixed liquid into the bacterial population selector (3); the water distribution pipe (37) is connected to the sludge inlet pipe (36), the water distribution pipe (37) is funnel-shaped with the upper part being wide and the lower part being narrow, and is used for uniformly distributing the three-phase mixed liquid into the straight cylinder portion (31); The sludge outlet pipe (38) is arranged at the bottom of the straight cylinder portion (31) and is connected to the microbial selection and enhancement reactor (1) in a reflux manner, and is used for refluxing the collected heavy sludge to the microbial selection and enhancement reactor (1).

6. A treatment system for a treatment method of an ammonium-containing organic waste liquid according to claim 5, characterized by, The low-pressure sludge selector (7) further comprises a sedimentation hopper (34), the sedimentation hopper (34) is arranged at the bottom end of the internal guide vane (32) and outside the water distribution pipe (37), and is used for collecting the water distributed by the water distribution pipe (37) to the internal guide vane (32).

7. The treatment system for the treatment method of an ammonium-containing organic waste liquid according to claim 4, characterized by, The low-pressure sludge selector (7) comprises a water inlet (71), a straight cylinder portion (73), a tapered portion (74), an overflow pipe (75) and a underflow port (76); The water inlet (71) adopts two groups, which are respectively connected to the water outlet of the denitrification reactor (6), and are oppositely arranged on the side walls of the straight cylinder portion (73) on both sides, and are used for introducing the mixed liquid of the denitrification reactor (6) into the straight cylinder portion (73) from two opposite directions; The straight cylinder portion (73) is in a cylindrical structure, the tapered portion (74) is arranged below the straight cylinder portion (73) in a conical structure and is connected to the straight cylinder portion (73) in an integral structure to form a treatment area; The overflow pipe (75) is inserted in the center of the straight cylinder portion (73), the depth of the overflow pipe (75) inserted in the straight cylinder portion (73) is 50% to 80% of the height of the straight cylinder portion (73), the lower end of the overflow pipe (75) is located in the middle area of the straight cylinder portion (73), the upper end of the overflow pipe (75) is higher than the top of the straight cylinder portion (73) and is fixed on the straight cylinder portion (73), and is connected to the sedimentation device (9) through a flange; an annular cyclone channel is formed between the outer wall of the overflow pipe (75) and the inner wall of the straight cylinder portion (73); the mixed liquid of the denitrification reactor (6) is introduced into the straight cylinder portion (73) from two opposite directions, and the mixed liquid in two directions forms a cyclone through the annular cyclone channel. The underflow port (76) is located at the bottom of the conical section (74) and extends into the activated sludge collecting tank (8) for collecting the activated sludge settled from the conical section (74); During the cyclone formation, the light-weighted aging bacteria group migrates to the center with the water flow and finally flows out from the upper part of the overflow pipe (75); the quality-dense activated bacteria group is settled in the conical section (74) and enters the underflow port (76).

8. A treatment system for a treatment method of an ammonium-containing organic waste liquid according to claim 7, characterized by, The tubular static mixer (72) is arranged at the front end of the water inlet port and is used for dispersing the aging bacteria bodies attached to the surface of the flocculation before the water inlet, so that the water inlet is fully mixed and dispersed before entering the straight cylinder section (73).

9. The treatment system for the treatment method of an ammonium-containing organic waste liquid according to claim 7, characterized by, The water inlet port (71) is provided with two symmetrically arranged water inlet ports on the two sides of the straight cylinder section (73) for enhancing the cyclone effect under the low pressure condition.

10. The treatment system for the treatment method of an ammonium-containing organic waste liquid according to claim 4, characterized by, The denitrification reactor (6) is provided with a stirring device (10) connected with a driving motor for preventing the sludge in the denitrification reactor (6) from being deposited.

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