CN102976552B - A method for advanced treatment of refractory organic nitrogen-containing industrial wastewater - Google Patents

Abstract

The invention relates to a method for deep treatment on difficultly-degraded organic nitrogen-containing industrial wastewater and belongs to the field of industrial wastewater treatment methods. The method comprises the following steps of 1, putting a suspended filler into a moving-bed biomembrane reactor, carrying out biomembrane culture, after the biomembrane culture, inputting difficultly-degraded nitrogen-containing industrial wastewater subjected to biochemical treatment into the moving-bed biomembrane reactor, and carrying out treatment, wherein the moving-bed biomembrane reactor operates by continuous water feeding, continuous draining and continuous aeration methods, 2, inputting the wastewater treated by the moving-bed biomembrane reactor into a membrane bioreactor, wherein the membrane bioreactor is added with activated sludge and operates by the continuous water feeding, continuous draining and continuous aeration methods, and 3, through a cartridge filter, treating the wastewater treated by the membrane bioreactor, and then filtering the treated wastewater by a reverse osmosis device. According to recycle water demands, it is determined if the step 3 is adopted so that quality-classification recycle is realized.

Description

A method for advanced treatment of refractory organic nitrogen-containing industrial wastewater

technical field

The invention belongs to the field of industrial wastewater treatment methods, in particular to an advanced treatment method for organic nitrogen-containing industrial wastewater.

Background technique

The pollutants contained in industrial wastewater are complex, and most industrial wastewater contains pollutants that are difficult to biodegrade. This makes the effluent of conventional biochemical treatment processes still contain some pollutants such as difficult biodegradable organic matter and ammonia nitrogen, which cannot meet the comprehensive requirements of wastewater. Therefore, it is necessary to increase the advanced wastewater treatment process to achieve the discharge of wastewater up to the standard, so as to realize the reuse of wastewater.

At present, the commonly used wastewater advanced treatment processes mainly include: (1) Coagulation and sedimentation process, which is used for advanced wastewater treatment and has a good treatment effect. The effluent quality can meet the national discharge standards, but a certain amount of The chemical agent, and the post-filtration process is required to remove the residual suspended particles in the wastewater, and the treatment cost is high; (2) The activated carbon adsorption process, which is often used in the intensive advanced treatment of wastewater, is affected by the types of pollutants in the influent The impact is small, the treatment effect is good, and the effluent water quality is better than the national comprehensive discharge standard for wastewater. However, due to the high operating cost of the device and the difficulty of activated carbon regeneration, it has not been popularized and applied in the actual advanced wastewater treatment; (3) Enhanced biological treatment As a commonly used enhanced biological treatment technology, the biological aerated filter process is usually used in the advanced biological treatment of wastewater. This process has a good treatment effect on nitrogen-containing pollutants in industrial wastewater, but it is difficult for industrial wastewater The removal effect of biodegradable organic matter is not ideal, and the effluent after treatment by this process still contains fine suspended particles, and it is difficult to discharge the treated wastewater up to the standard, and it is also impossible to realize the reuse of industrial wastewater.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for the advanced treatment of refractory organic nitrogen-containing industrial wastewater. The method has a good removal effect on residual nitrogen-containing pollutants and refractory biodegradable organic matter in the wastewater, and can achieve standard Discharge, and realize the reuse of waste water according to the different quality requirements of the reused water.

The advanced treatment method of refractory organic nitrogen-containing industrial wastewater described in the present invention can be treated by the following two methods according to the demand for reused water, so as to achieve the purpose of quality separation and reuse.

The process steps of method one are as follows:

(1) Put the suspended filler into the moving bed biofilm reactor and carry out biofilm cultivation. After the biofilm cultivation, the refractory organic nitrogen-containing industrial wastewater that has undergone biochemical treatment is input into the moving bed biofilm reactor for treatment. The moving bed biofilm reactor adopts the mode of continuous water intake, continuous drainage and continuous aeration;

(2) The wastewater treated by the moving bed biofilm reactor is input into the membrane bioreactor, and the activated sludge is placed in the membrane bioreactor, which is operated by continuous water inflow, gap drainage and continuous aeration. The wastewater is discharged after passing through the membrane filtration module of the membrane bioreactor, that is, the advanced treatment of refractory organic nitrogen-containing industrial wastewater is completed.

The waste water treated by the method can meet the reuse of the waste water when the water quality requirement is not high, such as spraying roads, landscape water and the like.

The process steps of method two are as follows:

(1) Put the suspended filler into the moving bed biofilm reactor and carry out biofilm cultivation. After the biofilm cultivation, the refractory organic nitrogen-containing industrial wastewater that has undergone biochemical treatment is input into the moving bed biofilm reactor for treatment. The moving bed biofilm reactor adopts the mode of continuous water intake, continuous drainage and continuous aeration;

(2) Input the wastewater treated by the moving bed biofilm reactor into the membrane bioreactor, and the membrane bioreactor is filled with activated sludge, and is operated by means of continuous water inflow, interstitial drainage and continuous aeration;

(3) The wastewater treated by the membrane bioreactor is filtered through a security filter and then filtered by a reverse osmosis device to complete the advanced treatment of refractory organic nitrogen-containing industrial wastewater.

The waste water treated by the method can meet the reuse of waste water when the water quality requirement is high, such as a circulating cooling water system.

In the above two methods, the dosage of the suspended filler is 25 to 45% of the effective volume of the moving bed biofilm reactor, and the hydraulic retention time of the wastewater in the moving bed biofilm reactor is 8 to 12 h. The amount of aeration mentioned above is limited to the concentration of dissolved oxygen in the moving bed biofilm reactor reaching 2-5 mg/L.

In the above two methods, the amount of activated sludge in the membrane bioreactor is controlled at 4 to 6 g per liter of wastewater, and the hydraulic retention time of the wastewater in the membrane bioreactor is 6 to 10 h. The aeration rate of air is limited when the concentration of dissolved oxygen in the membrane bioreactor reaches 3-6 mg/L, and the ratio of the drainage time of the intermittent drainage to the stop drainage time is 7:1-9:1.

In the above two methods, the biofilm cultivation method is as follows: add wastewater to the moving bed biofilm reactor and add activated sludge, the COD concentration in the wastewater is controlled at 300 ~ 500mg/L, and the ammonia nitrogen concentration is controlled at 15 ~40mg/L, the amount of waste water added is 70~90% of the effective volume of the moving bed biofilm reactor, the amount of activated sludge added is 2~3g per liter of waste water, and then aerated for 6 h, Stop the aeration for 2 hours, and discharge the wastewater when the COD concentration in the wastewater drops to 200~300mg/L and the ammonia nitrogen concentration drops to 5~15mg/L; The operation of gas and discharge of waste water is completed until the inner surface of the suspended filler is completely covered by biofilm.

In the above method two, some concentrated water will be generated during the operation of the reverse osmosis device, and the concentrated water can be discharged and treated with Fenton's reagent after each period of operation to further transform the non-biodegradable pollutants therein, and the Fenton's reagent The treated wastewater is passed into the moving bed membrane bioreactor for treatment, which can realize the effective treatment of non-degradable organic matter.

In the above two methods, the material of the suspended filler is usually polyethylene or its modified material, the density is 0.96-0.98 g/cm ³ , and the shape is a cylinder with a cross support structure inside, and its inner surface is completely made of The density of biofilm after coverage is close to that of wastewater.

The moving bed biofilm reactor, membrane bioreactor, security filter and reverse osmosis device used in the above two methods are commercially available.

The present invention has the following beneficial effects:

1. The present invention can overcome the problem that the existing nitrogen-containing industrial wastewater advanced treatment technology has poor removal effect on the refractory organic matter contained in the wastewater, and the effluent is difficult to reach the standard, and can realize the recovery of nitrogen-containing industrial wastewater according to different industrial wastewater reuse requirements. Quality reuse.

2. The inner surface of the suspended packing in the moving bed biofilm reactor technique of the method of the present invention grows with a biofilm, and this biofilm is a collection of microorganisms, which has a good removal ability for organic matter and ammonia nitrogen, and the suspended packing has no effect on microorganisms. It has a good fixation effect, which can reduce the impact of hydraulic shearing on biofilm, so as to ensure that the reactor still has a good pollutant removal effect under unfavorable operating conditions.

3. The moving bed biofilm reactor technology adopted in the method of the present invention, under the action of aeration, the suspended filler after hanging the film circulates in the bioreactor, and relies on the metabolism of the microbial flora in the biofilm to remove the waste water. Pollutants, mass transfer effect is good, overcoming the problem that the biofilm process is prone to clogging.

4. The membrane bioreactor process adopted in the method of the present invention has a longer sludge age, so the microbial population therein has better adaptability to the refractory biodegradable organic matter in the wastewater, and passes through the moving bed biofilm reactor. Treatment, the concentration of pollutants in the wastewater is very low, and the organic matter available for microbial growth in the membrane bioreactor is limited, which can effectively reduce the impact of biofilm pollution on the filtration performance of the membrane.

5. The membrane bioreactor process adopted in the method of the present invention can simultaneously realize the biodegradation of pollutants in wastewater and the filtration function of fine suspended solids, and the effluent treated by this process can meet the reuse of wastewater when the water quality requirements are not high , the effluent treated by the reverse osmosis device can meet the reuse of wastewater when the water quality requirements are high, realize the graded reuse of wastewater, achieve the goal of zero discharge of industrial wastewater, and eliminate the impact of industrial wastewater on the ecological environment from the source. social benefits.

Description of drawings

Fig. 1 is the first process flow diagram of the advanced treatment method of refractory organic nitrogen-containing industrial wastewater of the present invention;

Fig. 2 is the second process flow chart of the advanced treatment method of refractory organic nitrogen-containing industrial wastewater according to the present invention.

In the figure, 1—moving bed biofilm reactor, 2—membrane bioreactor, 3—inlet pump, 4—perforated aeration pipe, 5—aeration pump, 6—suspended packing, 7—membrane module, 8-1 - the first water outlet pump, 8-2 - the second water outlet pump, 9 - security filter, 10 - reverse osmosis device.

Detailed ways

The advanced treatment method of the refractory organic nitrogen-containing industrial wastewater according to the present invention will be further described through examples below. In each of the following embodiments, the main body of the moving bed biofilm reactor 1 is a cylinder with a height-to-diameter ratio of 2:1, and the bottom is provided with an aeration tube 4 communicating with the external aeration pump 5, and its effective volume is It is 10L; the membrane bioreactor 2 is an internal circulation structure, and a membrane filter assembly 7 is fixed in the inner sleeve. The bottom of the membrane bioreactor is provided with an aeration pipe 4 connected with the external aeration pump 5, which is effective The volume is 12L. The security filter 9 is selected according to the actual amount of water processed, and the water production rate of the reverse osmosis device is 20L/h. The material of the suspended filler is polyethylene, the density is 0.96-0.98 g/cm ³ , the shape is a cylinder, and the external dimension is Φ25mm×10mm. It has a cross support structure inside, and its inner surface is completely covered by biofilm. Density close to the density of waste water.

Example 1

In this example, the water quality of the refractory organic nitrogen-containing industrial wastewater after biochemical treatment: the COD concentration is 300 mg/L, the ammonia nitrogen concentration is 20 mg/L, and the pH value is 7.5.

In this embodiment, the advanced treatment process of refractory organic nitrogen-containing industrial wastewater is as shown in Figure 1, and the steps are as follows:

(1) Put the suspended filler 6 made of polyethylene into the moving bed biofilm reactor 1 and carry out biofilm cultivation. The amount of the suspended filler 6 is 25% of the effective volume of the moving bed biofilm reactor. The biofilm cultivation method is as follows: add wastewater with a COD concentration of 500 mg/L and an ammonia nitrogen concentration of 40 mg/L to the moving bed biofilm reactor, the amount of the wastewater added is 90% of the effective volume of the reactor, and then add activated sludge , the dosage of activated sludge is 3g per liter of wastewater, and it is operated in the way of aeration for 6 hours and stop aeration for 2 hours. When the concentration of COD in the wastewater drops to 300mg/L and the concentration of ammonia nitrogen drops to 15mg/L, it is drained; Then repeat the above-mentioned operations of adding waste water, intermittent aeration and discharging waste water to the moving bed biofilm reactor until the inner surface of the suspended packing is completely covered by the biofilm and the cultivation is completed.

After the biofilm cultivation is completed, the biochemically treated refractory organic nitrogen-containing industrial wastewater is pumped into the moving bed biofilm reactor through the water inlet pump 3 from the bottom of the moving bed biofilm reactor 1 for treatment. Reactor 1 operates in a mode of continuous water inflow, continuous drainage, and continuous aeration. The hydraulic retention time of the wastewater in the moving bed biofilm reactor is 8h, and the aeration rate of the aeration is the same as that of the moving bed biofilm reaction. The concentration of dissolved oxygen in the tank is limited to 2mg/L;

(2) The waste water treated by the moving bed biofilm reactor 1 flows into the upper part of the membrane bioreactor 2 by gravity from its upper part, and activated sludge is placed in the membrane bioreactor, and continuous water inflow and interstitial drainage are adopted. , continuous aeration mode operation, the amount of activated sludge in the membrane bioreactor is controlled at 4 g per liter of waste water, the hydraulic retention time of the waste water in the membrane bioreactor is 6 h, the aeration The aeration rate reaches 3 mg/L as the limit with the dissolved oxygen concentration in the membrane bioreactor 2, and the ratio of the drainage of the intermittent drainage to the time of stopping the drainage is 7:1, and the wastewater after treatment passes through the membrane bioreactor. The membrane filtration module 7 is then pumped out by the first water outlet pump 8-1 to complete the advanced treatment of refractory organic nitrogen-containing industrial wastewater.

The refractory nitrogen-containing organic industrial wastewater treated in this example was tested and analyzed, and the result was: the COD concentration was 90 mg/L, and the ammonia nitrogen concentration in the effluent was lower than 10 mg/L.

Example 2

In this example, the water quality of the refractory organic nitrogen-containing industrial wastewater after biochemical treatment: the COD concentration is 300 mg/L, the ammonia nitrogen concentration is 20 mg/L, and the pH value is 7.5.

In this embodiment, the advanced treatment process of refractory organic nitrogen-containing industrial wastewater is as shown in Figure 1, and the steps are as follows:

(1) Put the suspended filler 6 made of polyethylene into the moving bed biofilm reactor 1 and carry out biofilm cultivation, the amount of the suspended filler is 45% of the effective volume of the moving bed biofilm reactor, and the biological The membrane culture method is as follows: add wastewater with a COD concentration of 300mg/L and an ammonia nitrogen concentration of 15mg/L to the moving bed biofilm reactor, the amount of wastewater added is 70% of the effective volume of the reactor, and then add activated sludge, The dosage of activated sludge is 2g per liter of wastewater, and it is operated in the mode of aeration for 6 hours and stop aeration for 2 hours. When the COD in the wastewater drops to 200mg/L and the concentration of ammonia nitrogen drops to 5mg/L, it is drained; then repeat The above-mentioned operations of adding wastewater to the moving bed biofilm reactor, intermittently aerating and discharging wastewater until the inner surface of the suspended filler is completely covered by the biofilm will end the cultivation;

After the biofilm cultivation is completed, the biochemically treated refractory organic nitrogen-containing industrial wastewater is pumped into the moving bed biofilm reactor through the water inlet pump 3 from the bottom of the moving bed biofilm reactor 1 for treatment. The reactor operates in a mode of continuous water inflow, continuous drainage, and continuous aeration. The hydraulic retention time of the wastewater in the moving bed biofilm reactor is 12 h, and the aeration rate of the aeration is as high as that of the moving bed biofilm reaction. The concentration of dissolved oxygen in the tank is limited to 5 mg/L;

(2) The waste water treated by the moving bed biofilm reactor flows into the upper part of the membrane bioreactor 2 by gravity from its upper part, and activated sludge is placed in the membrane bioreactor, and continuous water inflow, interstitial drainage, Continuous aeration mode operation, the amount of activated sludge in the membrane bioreactor is controlled at 6 g per liter of wastewater, the hydraulic retention time of the wastewater in the membrane bioreactor is 10 h, the aeration of the aeration The gas volume is limited when the dissolved oxygen concentration in the membrane bioreactor reaches 6 mg/L, and the ratio of the drainage of the intermittent drainage to the time of stopping the drainage is 9:1; the treated wastewater is filtered through the membrane of the membrane bioreactor The component 7 is then pumped out by the first water outlet pump 8-1, and the advanced treatment of refractory organic nitrogen-containing industrial wastewater is completed.

The refractory nitrogen-containing organic industrial wastewater treated in this example was tested and analyzed, and the results were: the COD concentration was 80 mg/L, and the ammonia nitrogen concentration in the effluent was lower than 5 mg/L.

Example 3

In this example, the water quality of the refractory organic nitrogen-containing industrial wastewater after biochemical treatment: the COD concentration is 300 mg/L, the ammonia nitrogen concentration is 20 mg/L, and the pH value is 7.5.

In this embodiment, the advanced treatment process of refractory organic nitrogen-containing industrial wastewater is as shown in Figure 2, and the steps are as follows:

(1) Put the suspended filler 6 made of polyethylene into the moving bed biofilm reactor 1 and carry out biofilm cultivation, the amount of the suspended filler is 25% of the effective volume of the moving bed biofilm reactor, and the biological The membrane culture method is as follows: add COD concentration 500mg/L, ammonia nitrogen concentration 40mg/L wastewater into the moving bed biofilm reactor, the amount of wastewater added is 90% of the effective volume of the reactor, and then add activated sludge, The dosage of activated sludge is 3g per liter of wastewater, and it is operated in the mode of aeration for 6 hours and stop aeration for 2 hours. When the concentration of COD in the wastewater drops to 300mg/L and the concentration of ammonia nitrogen drops to 15mg/L, it is drained; then Repeat the above operations of adding waste water, intermittent aeration and discharging waste water to the moving bed biofilm reactor until the inner surface of the suspended packing is completely covered by the biofilm, and the cultivation ends.

After the biofilm cultivation is completed, the biochemically treated refractory organic nitrogen-containing industrial wastewater is pumped into the moving bed biofilm reactor through the water inlet pump 3 from the bottom of the moving bed biofilm reactor 1 for treatment. The reactor operates in a mode of continuous water inflow, continuous drainage, and continuous aeration. The hydraulic retention time of the wastewater in the moving bed biofilm reactor is 8h, and the aeration rate of the aeration is the same as that of the moving bed biofilm reactor. The concentration of dissolved oxygen in the tank is limited to 2mg/L;

(2) The waste water treated by the moving bed biofilm reactor flows into the upper part of the membrane bioreactor 2 by gravity from its upper part, and activated sludge is placed in the membrane bioreactor, and continuous water inflow, interstitial drainage, The mode of continuous aeration is operated, the amount of activated sludge in the membrane bioreactor is controlled at 4 g per liter of wastewater, and the hydraulic retention time of the wastewater in the membrane bioreactor is 6 h. The gas volume is limited when the dissolved oxygen concentration in the membrane bioreactor reaches 3 mg/L. The ratio of the intermittent drainage to the time of stopping drainage is 7:1, and the treated wastewater is filtered through the membrane of the membrane bioreactor. After the assembly 7, it is pumped out by the first outlet pump 8-1;

(3) The wastewater treated by the membrane bioreactor is pumped into the security filter 9 by the first outlet pump 8-1, and the outlet water of the security filter 9 is filtered by the reverse osmosis device 10, and then the second outlet pump 8-2 Pump out to complete the advanced treatment of refractory organic nitrogen-containing industrial wastewater.

The refractory nitrogen-containing organic industrial wastewater treated in this example was tested and analyzed, and the result was: the COD concentration was 40 mg/L, and the ammonia nitrogen concentration in the effluent was 3 mg/L.

Example 4

In this example, the water quality of the refractory organic nitrogen-containing industrial wastewater after biochemical treatment: the COD concentration is 300 mg/L, the ammonia nitrogen concentration is 20 mg/L, and the pH value is 7.5.

In this embodiment, the advanced treatment process of refractory organic nitrogen-containing industrial wastewater is as shown in Figure 2, and the steps are as follows:

(1) Put the suspended filler 6 made of polyethylene into the moving bed biofilm reactor 1 and carry out biofilm cultivation, the amount of the suspended filler is 45% of the effective volume of the moving bed biofilm reactor, and the biological The membrane culture method is as follows: add wastewater with a COD concentration of 300mg/L and an ammonia nitrogen concentration of 15mg/L to the moving bed biofilm reactor, the amount of wastewater added is 70% of the effective volume of the reactor, and then add activated sludge, The dosage of activated sludge is 2g per liter of wastewater, and it is operated in the mode of aeration for 6 hours and stop aeration for 2 hours. When the concentration of COD in the wastewater drops to 200mg/L and the concentration of ammonia nitrogen is 5mg/L respectively; then repeat The above-mentioned operations of adding wastewater to the moving bed biofilm reactor, intermittently aerating and discharging wastewater until the inner surface of the suspended filler is completely covered by the biofilm will end the cultivation.

After the biofilm cultivation is completed, the biochemically treated refractory organic nitrogen-containing industrial wastewater is pumped into the moving bed biofilm reactor through the water inlet pump 3 from the bottom of the moving bed biofilm reactor 1 for treatment. The reactor operates in a mode of continuous water inflow, continuous drainage, and continuous aeration. The hydraulic retention time of the wastewater in the moving bed biofilm reactor 1 is 12 h, and the aeration rate of the aeration is calculated as the moving bed biofilm reactor 1. The dissolved oxygen concentration in the reactor is limited to 5 mg/L;

(2) The waste water treated by the moving bed biofilm reactor 1 flows into the upper part of the membrane bioreactor 2 by gravity from its upper part, and activated sludge is placed in the membrane bioreactor, and continuous water inflow and interstitial drainage are adopted. , continuous aeration mode operation, the amount of activated sludge in the membrane bioreactor is controlled at 6 g per liter of waste water, the hydraulic retention time of the waste water in the membrane bioreactor is 10 h, the aeration The amount of aeration is limited when the concentration of dissolved oxygen in the membrane bioreactor reaches 6 mg/L, the ratio of the drainage of the intermittent drainage to the time of stopping drainage is 9:1, and the treated wastewater passes through the membrane of the membrane bioreactor. After the filter assembly 7 is pumped out by the first outlet pump 8-1;

(3) The wastewater treated by the membrane bioreactor is pumped into the security filter 9 by the first outlet pump 8-1, and the outlet water of the security filter 9 is filtered by the reverse osmosis device 10, and then the second outlet pump 8-2 Pump out to complete the advanced treatment of refractory organic nitrogen-containing industrial wastewater.

The refractory nitrogen-containing organic industrial wastewater treated in this example was tested and analyzed, and the results were: the COD concentration was 30 mg/L, and the ammonia nitrogen concentration in the effluent was 1 mg/L.

Claims (4)

1. the deep treatment method of a difficult degradation organic nitrogen-containing trade effluent is characterized in that processing step is as follows:

(1) floating stuffing dropped in MBBR and carry out the microbial film cultivation, after microbial film is cultivated and is finished, to in the difficult degradation organic nitrogen-containing trade effluent input MBBR through biochemical treatment, be processed, described MBBR adopts the mode of continuous water inlet, continuous drainage, continuous aeration to move;

(2) the waste water input membrane bioreactor that will process through MBBR, throw in active sludge is arranged in described membrane bioreactor, adopt the mode of water inlet continuously, gap draining, continuous aeration to move, waste water after processing discharges after the membrane filtration module of membrane bioreactor, completes the advanced treatment of difficult degradation organic nitrogen-containing trade effluent;

Described microbial film cultural method is as follows: in MBBR, add waste water and add active sludge, in described waste water, COD concentration is controlled at 300～500mg/L, ammonia nitrogen concentration is controlled at 15～40mg/L, the add-on of described waste water is 70～90% of MBBR useful volume, the dosage of described active sludge is every liter of waste water 2～3g, then with aeration 6h, the mode of stopping aeration 2h, move, in waste water, COD concentration is down to when 200～300mg/L, ammonia nitrogen concentration are down to 5～15mg/L and is discharged waste water;

Repeat the above-mentioned operation to adding waste water, intermittent aeration and discharge waste water in MBBR, until the floating stuffing internal surface finishes to cultivate while being covered by microbial film fully.

2. the deep treatment method of a difficult degradation organic nitrogen-containing trade effluent is characterized in that processing step is as follows:

(1) floating stuffing dropped in MBBR and carry out the microbial film cultivation, after microbial film is cultivated and is finished, to in the difficult degradation organic nitrogen-containing trade effluent input MBBR through biochemical treatment, be processed, described MBBR adopts the mode of continuous water inlet, continuous drainage, continuous aeration to move;

(2) the waste water input membrane bioreactor that will process through MBBR, throw in active sludge arranged in described membrane bioreactor, adopts continuously the mode of water inlet, gap draining, continuous aeration to move;

(3) waste water after Membrane Bioreactor for Wastewater Treatment is adopted after cartridge filter reverse osmosis unit filtered the advanced treatment that completes difficult degradation organic nitrogen-containing trade effluent;

Described microbial film cultural method is as follows: in MBBR, add waste water and add active sludge, in described waste water, COD concentration is controlled at 300～500mg/L, ammonia nitrogen concentration is controlled at 15～40mg/L, the add-on of described waste water is 70～90% of MBBR useful volume, the dosage of described active sludge is every liter of waste water 2～3g, then with aeration 6h, the mode of stopping aeration 2h, move, in waste water, COD concentration is down to when 200～300mg/L, ammonia nitrogen concentration are down to 5～15mg/L and is discharged waste water;

Repeat the above-mentioned operation to adding waste water, intermittent aeration and discharge waste water in MBBR, until the floating stuffing internal surface finishes to cultivate while being covered by microbial film fully.

3. according to the deep treatment method of the described difficult degradation organic nitrogen-containing of claim 1 or 2 trade effluent, the injected volume that it is characterized in that described floating stuffing is 25～45% of MBBR useful volume, the hydraulic detention time of described waste water in MBBR is 8～12h, and the aeration rate of described aeration reaches 2～5mg/L with the dissolved oxygen concentration in MBBR and is limited.

4. according to the deep treatment method of the described difficult degradation organic nitrogen-containing of claim 1 or 2 trade effluent, it is characterized in that the active mud content in described membrane bioreactor is controlled at every liter of waste water 4～6g, the hydraulic detention time of described waste water in membrane bioreactor is 6～10h, the aeration rate of described aeration reaches 3～6mg/L with the dissolved oxygen concentration in membrane bioreactor and is limited, and the water discharge time of described intermittent drainage is 7:1～9:1 with the ratio that stops water discharge time.

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