CN103172170A - Sequencing batch completely autotrophic ammonia removal technology running method - Google Patents

Abstract

A sequencing batch completely autotrophic ammonia removal (CANON) technology running method belongs to the technical field of high-ammonia-nitrogen wastewater processing. The method comprises the following steps: 1, directly inoculating volcanic CANON biofilter backwash sludge for saving a long starting time; 2, determining the running DO value of the technology, and improving the dissolved oxygen when the DO value is 0-0.5, and most preferably 0.4, to improve the reaction rate; and 3, carrying out appropriate extended aeration to completely remove ammonia nitrogen in a reaction system without influencing the stable running of the system. The running method successfully solves a long starting time problem of the CANON technology, has the advantages of simplicity, obvious effect, and convenience for subsequent technological treatment because of the complete removal of ammonia nitrogen, and is a feasible and effective method for the running of the sequencing batch CANON technology.

Description

A kind of sequence batch (Full Autotrophic Ammonium Removal Process operation method

Technical field

The present invention relates to the high ammonia-nitrogen wastewater process field, relate to specifically the operation method that solves sequence batch (whole process autotrophic denitrification CANON technique under the high ammonia-nitrogen wastewater condition.

Background technology

Along with Economic development mankind's activity aggravation, water pollution increasingly sharpens, and wherein the pollution of nitrogen can cause the series of problems such as body eutrophication, isolated atmosphere oxygen enrichment, generation toxic substance, increase cost of water treatment.The sludge digestion liquid of Sewage Plant and various trade effluent (chemical fertilizers production, food-processing, dyeing, garbage loading embeading and percolate etc.) ammonia nitrogen quantity discharged is very large, it has the characteristics such as ammonia nitrogen concentration is high, C/N is low, therefore this type of wastewater treatment difficulty, be one of important factor that causes China's water environment pollution.

The typical water quality of the low high ammonia nitrogen of carbon source, treatment process mainly contains biological process and physico-chemical process at present, and wherein the physico-chemical process waste water of processing low C/N has that processing costs is high, complicated operation easily produces the shortcomings such as secondary pollution; Therefore biological denitrificaion has some superiority.In biological denitrification process, whole process autotrophic denitrification CANON technique has that aeration rate is few, to need not the characteristics such as additional carbon, reaction unit are few be the possibility that is fit to described waste water.But CANON technique is long start time, and operational conditions is harsh, is difficult to long steady running, thereby affects application and the popularization of this technique.

Therefore, for long problem CANON technique start time, and how to make this technique be the key of this technique in application at the state of steady running.Application for sequence batch (whole process autotrophic denitrification CANON technique has great significance.

Summary of the invention

The object of the invention is to solve the problem of whole process autotrophic denitrification CANON technique length start time and operational conditions harshness.For reaching above-mentioned technique effect, technical scheme of the present invention is achieved in that

The operation method of a kind of sequence batch (CANON technique provided by the present invention, be under normal temperature condition (17-25 ℃) take artificial high ammonia nitrogen water distribution as water inlet, experimental installation as shown in Figure 1, inside is provided with mechanical stirring device, the bottom is provided with the aerating apparatus aeration and is controlled by spinner-type flowmeter.In test mainly by changing the DO value and realizing reaction time.

The present invention adopts the sequencing batch activated sludge biological tank, direct inoculation volcanics biological filter back flushing CANON

Mud, postvaccinal sludge concentration 1.5-5g/L; Sequencing batch operation is adopted in test, and the draining ratio is

70%-50%, initial pH is 8.10 ± 0.10;

Technique is normally moved the control of dissolved oxygen DO: the adaptation of primary stage of inoculation volcanic filling material recoil CANON mud should be taked DO value 0.05-0.1mg/L; Improve gradually afterwards the DO value to 0.5mg/L to increase speed of reaction; Stable, namely nitrogen removal rate reaches more than 80% and moves 5 days, should keep afterwards DO value 0.4-0.5mg/L; Keep technological temperature greater than 17-25 ℃;

Reaction end within rear 2 hours appears in the dissolved oxygen curve flex point.

Principle is described as follows:

A, inoculation volcanics biological filter back flushing ripe CANON process sludge out are directly used in sequence batch (CANON technique.Keep the DO value and can directly obtain good removal effect for 0.05-0.1mg/L.

B, keep after inoculation DO value for 0.05-0.1mg/L approximately 7 days namely stable afterwards, but by raising DO Reaction time shorten, improve the operating load of this technique.Reduced to 11.5 hours by improving constantly DO value to the 0.4mg/L required time of reaction from 22 hours; Occurred a large amount of inferior nitrogen accumulation in reactor when the DO value surpasses 0.5mg/L, caused simultaneously the sharply decline of pH value, find almost not have after testing total nitrogen loss, but the DO value is reduced to 0.4mg/L can recover normal.

C, extended aeration on this technique without large impact.Because the variation of influent concentration and the growth of sludge quantity all can affect the reaction times, extended aeration will inevitably occur or react inadequate phenomenon as controlling parameter with the time; This technique continued aeration 2 hours after finishing by DO value hop Indicator Reaction, and its result shows does not affect the operation of next cycle, and makes the removal of ammonia nitrogen reach 100%.

Summing up as above can this process operation mode

The present invention is by the control of DO value in reactor, and the CANON microbial film that can be is directly recoiled out in the volcanics biological filter directly applies to sequence batch (CANON technique, has directly saved the start time of CANON technique.Simple to operate in operational process, easily control, reached respectively more than 99% and 85% with the reactor reaction device water outlet ammonia nitrogen of the present invention's operation and the clearance of total nitrogen, the removal of total nitrogen load has reached 0.6kg/m ³/ d has reached removal effect preferably.

The present invention has following beneficial effect:

1) adopt volcanics biological filter back flushing CANON mud out, the start time of having saved this technique;

2) can realize preferably the steady running of CANON technique by controlling DO, simply effective as the end of reaction time with DO;

3) extended aeration is less to this technogenic influence, and the extended aeration of short period of time can fully be removed the ammonia nitrogen in water body and not affect the operation of the next cycle of technique.

Description of drawings:

Fig. 1 is the CANON testing apparatus schematic diagram that the present invention adopts.

1. whipping appts, 2. online WTW probe, 3. water outlet, 4. pneumatic pump, 5. aeration ring

Fig. 2 is ammonia nitrogen removal frank and the total nitrogen removal effect figure that adopts present method.

Embodiment

Below in conjunction with embodiment, the present invention is described further, protection scope of the present invention is not limited to this.

The present invention is the operation method of sequence batch (whole process autotrophic denitrification (CANON) technique, its thinking is: the mud that the CANON technique of inoculation volcanics biological filter recoils out, directly apply to the CANON technique of sequence batch (by low dissolved axygen, and then obtain best operating performance by regulating the DO value.Operational conditions be influent ammonium concentration greater than 200mg/L, basicity concentration is 4 times of ammonia nitrogen concentration, changing the water ratio is 0.7, keeps temperature of reaction and is not less than 17 ℃.

The present invention directly applies to sequencing batch active sludge CANON technique by the CANON process sludge that inoculation volcanics biological filter comes off, and begins to regulate the DO value less than 0.1mg/L at seed sludge, makes mud adapt to gradually new operation architecture.

The size of the present invention by regulation and control DO value makes this technique can obtain relatively high operating load and operating performance preferably.Improve DO value and to improve speed of reaction after mud adapts to sequencing batch operation in 0.05～0.5mg/L scope, thereby will destroy whole reaction system the inferior nitrogen of one-tenth a large amount of residual over this scope.

Ammonia nitrogen in reactor all can be removed by suitable extended aeration.The indication parameter that flex point can be used as reaction terminating appears in the DO value, but still may there be the ammonia nitrogen of part residual, therefore this example adopt continue that the DO value mutation after it is carried out aeration 0～2 hour can the ammonia nitrogen removal in reactor is clean, the while can not have any impact to system again.

Specific embodiment

The artificial high ammonia nitrogen water distribution of sequence batch (CANON art breading is to add appropriate (NH in tap water ₄) ₂SO ₄, NaHCO ₃, KH ₂PO ₄Configuration forms, and does not contain organic carbon source.Concrete water quality is as follows:

The ammonia nitrogen mass concentration is 380-420mg/L; The nitrite nitrogen concentration is 0-5mg/L; The phosphoric acid salt mass concentration is 0.5-2mg/L; The mass concentration of basicity is (with CaCO ₃) be 1600-1800mg/L.

The biological reaction tank that reactor adopts synthetic glass to process, internal diameter 250mm, height 250mm, cumulative volume 12L, effective volume 10L.Adopt the sequencing batch operation mode, inside is provided with whipping appts, and the bottom is provided with aerating apparatus, controls the aeration rate size by spinner-type flowmeter.

It is 0.7 that normal operating phase changes the water ratio, and aeration rate is 0.2L/min, and temperature is 17～25 ℃, and pH is 8.0-8.2, and be 12～36 hours per working time in cycle, instant water coming-in wherein, and sedimentation time is 0.5 hour, draining 3 minutes.Reactor can reach 0.55kgN/m ³The removal load of/d and 85% clearance.

Primary stage of inoculation is kept the DO value and is adapted to new environment for 0.05mg/L-0.1mg/L can make rapidly mud; Through the operation in 7 cycles, the DO value being increased to the 0.2mg/L reactor still has good removal effect, and tapered to 24 hour by before 36 hours reaction time.Can shorten the reaction times of reactor by improving constantly the DO value afterwards in 0.05～0.45mg/L scope, will destroy the steady running of system when the DO value surpasses 0.5mg/L.

Add new biological filter back flushing not impact of mud operation out in stable system.Operation the 44th day, add the mud identical with inoculation in system, keep simultaneously other conditions constant, can Reaction time shorten.

Can be with the removal fully in reactor with the lookup delay aeration at the run duration of whole test, in the cycle, in short-term extended aeration does not affect the steady running of reactor.

This method operation scheme is simple, need not start time, and ammonia nitrogen removal frank is high.Within the whole service phase, the transformation efficiency of ammonia nitrogen is about 100%, and the clearance average out to 86.2% of total nitrogen can obtain maximum removal load and be 0.6kgN/m ³/ d.

Claims (1)

1. the operation method of a sequence batch (Full Autotrophic Ammonium Removal Process is characterized in that:

Adopt the sequencing batch activated sludge biological tank, direct inoculation volcanics biological filter back flushing CANON mud, postvaccinal sludge concentration 1.5-5g/L; Sequencing batch operation is adopted in test, and draining is than being 70%-50%, and initial pH is 8.10 ± 0.10;

Technique is normally moved the control of dissolved oxygen DO: the adaptation of primary stage of inoculation volcanic filling material recoil CANON mud should be taked DO value 0.05-0.1mg/L; Improve gradually afterwards the DO value to 0.5mg/L to increase speed of reaction; Stable, namely nitrogen removal rate reaches more than 80% and moves 5 days, should keep afterwards DO value 0.4-0.5mg/L; Keep technological temperature greater than 17-25 ℃;

Reaction end within rear 2 hours appears in the dissolved oxygen curve flex point.

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