CN102908849B - The processing method of discharged exhaust gas in sewage disposal field - Google Patents
The processing method of discharged exhaust gas in sewage disposal field Download PDFInfo
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- CN102908849B CN102908849B CN201110217405.7A CN201110217405A CN102908849B CN 102908849 B CN102908849 B CN 102908849B CN 201110217405 A CN201110217405 A CN 201110217405A CN 102908849 B CN102908849 B CN 102908849B
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Abstract
The invention discloses a kind of processing method of discharged exhaust gas in sewage disposal field, comprise following content: discharged exhaust gas in sewage disposal field heats up 2 ~ 40 DEG C, through desulfurization section and the discharge of hydrocarbon concentration homogenizing zone, desulfurization section uses solid desulfurating agent, and hydrocarbon concentration homogenizing zone uses the material with concentration homogenization.The advantages such as compared with prior art, it is high that the inventive method has treatment effeciency, and cost is low, and plant running is stable, the purified treatment of optimum process various biochemical aeration formula discharged exhaust gas in sewage disposal field.
Description
Technical field
The present invention relates to a kind of processing method of discharged exhaust gas in sewage disposal field, specifically sewage farm biochemical treatment apparatus, particularly the processing method of biochemical aeration sewage-treatment plant discharging waste gas.
Background technology
Sewage farm is the important sewage treatment facility in oil plant, urban operating mechanism.Biochemical processing has that cost is low, high treating effect, is the important step of sewage disposal, and wherein aerobic treatment needs to pass into large quantity of air in sewage, adds the reasons such as dirty evaporation of water, causes sewage farm to airborne release large quantity of exhaust gas.This type of waste gas is large-minded but harmful constituent concentration is lower, and total hydrocarbon concentration is generally several mg/m under normal circumstances
3, meet discharge standard, but when running into damage, total hydrocarbon concentration can reach tens to a hundreds of mg/m
3.This type of waste gas needs the main cause of administering to be to have stench taste, and have a strong impact on surrounding environment, threaten to health, stench taste mainly comes from the activated sludge spittle, trace hydrogen sulfide and other sulfur-containing compound that wherein contain.
Discharged exhaust gas in sewage disposal field is because of large-minded, and pollutant levels are low, and therefore suitable treatment technology is limited.Traditional exhaust gas treatment method is as uneconomical in this kind of waste gas of process such as absorption method, burning method, Production by Catalytic Combustion Process, condensation method, absorption process.Absorption method adsorbent amount is large, regeneration difficulty, fluctuation of service.Burning method and Production by Catalytic Combustion Process all need supplementary a large amount of fuel, and energy consumption is high, less economical.Condensation method and absorption process are not more suitable for this type of low concentration gas.It is low that this kind of waste gas of biological method purification has operating cost, non-secondary pollution advantage, be the ideal process method of this type of waste gas, but biological clarification generally needs multistep treatment, and unit scale is large, and purification efficiency is unstable.
CN200710031286.X proposes to adopt absorption-bio combined processing method, absorbs and adopts common absorption equipment, and bioanalysis also adopts a conventional filter equipment, and the method can make hydrogen sulfide and ammonia clearance reach more than 99%.The method equipment takes up an area comparatively large, limited to hydrocarbons clearance.CN01127539.1 describes a kind of method purifying hydrogen sulfide, and CN1133568 describes a kind of method that absorption process removes hydrogen sulfide.Said method all only can remove hydrogen sulfide.CN01804540.5 proposes a kind of biological purification method that agitator is housed, made the biofilm detachment of the non-activity of filling surface by agitator and remove, thus extend the service life of bioreactor, microbial method is for the larger sulfide waste gas of fluctuation of concentration, then be difficult to ensure purifying rate, also larger on biological cleaning impact.CN200910204294 discloses a kind of processing method of multi-component stink exhaust gas, adopts pretreatment-microbial method Combined Treatment, has the deficiency of microbial method technology equally.
CN01114172.7 adopts the method for pretreatment-catalytic combustion, by the waste gas purification containing complex component, the method purification efficiency is high, harsh environmental protection standard requirement can be met, but the method energy consumption is comparatively large, when pollutant levels in waste gas are very low, needs to reach reaction temperature or postcombustion by electrical heating, for environmental protecting device, economical poor.CN200610046441 discloses a kind of comprehensive purifying method of foul waste gas, washs-adsorption treatment to discharged exhaust gas in sewage disposal field, and adsorbent equipment regeneration gas carries out catalytic combustion process.The method needs the catalytic combustion process in conjunction with other high-concentration organic waste gas, and adsorbent equipment has scale greatly simultaneously, the deficiencies such as fluctuation of service.
Summary of the invention
The advantages such as above-mentioned the deficiencies in the prior art, the present invention proposes a kind of processing method of discharged exhaust gas in sewage disposal field, it is high that the inventive method has treatment effeciency, and cost is low, and plant running is stable.
The processing method of discharged exhaust gas in sewage disposal field of the present invention comprises following content: discharged exhaust gas in sewage disposal field heats up 2 ~ 40 DEG C and preferably heats up 5 ~ 25 DEG C, then through desulfurization section and the discharge of hydrocarbon concentration homogenizing zone, desulfurization section uses solid desulfurating agent, and hydrocarbon concentration homogenizing zone uses the material with concentration homogenization.
In the inventive method, sewage farm is biochemical aeration formula sewage farm, and first discharged exhaust gas in sewage disposal field can carry out through pretreatment section the pretreatment that is suitable for, and then heats up through desulfurization section and the discharge of hydrocarbon concentration homogenizing zone.Pretreatment can adopt packed tower to carry out with industry water the mode of washing etc.
In the inventive method, discharged exhaust gas in sewage disposal field and catalytic combustion system tail gas or other high-temperature flue gas adopt and directly to mix or the mode of heat exchange heats up, and the mode of preferably directly mixing heats up.Catalytic combustion system is organic waste gas purifying processing device, and emission temperature after Btu utilization, still more than 100 DEG C, generally cannot be carried out Energy harvesting again and directly discharge, utilize this heat to be heated up by discharged exhaust gas in sewage disposal field in the inventive method.
In the inventive method, desulfurization section can use solid desulfurating agent conventional in this area, the active component of solid desulfurating agent is one or more in iron oxide, zinc oxide, NaOH, potassium hydroxide, calcium hydroxide, magnesium hydroxide, cupric oxide, FeOOH etc., preferred low temperature (less than 80 DEG C) desulphurizing activated high component, as one or more in FeOOH, NaOH, potassium hydroxide, calcium hydroxide, magnesium hydroxide etc., other Suitable ingredients can be contained, as adhesive, reinforcing agent, carrier etc. in solid desulfurating agent simultaneously.Waste gas is generally 200 ~ 10000h by the volume space velocity of desulfurization section
-1, preferably 300 ~ 5000h
-1.Specifically can determine according to situations such as the service cycles of the performance of the concentration of waste gas medium sulphide content, desulfurizing agent and expectation.
In the inventive method, the material with concentration homogenization is the combination of one or more in active carbon, molecular sieve, silica gel, aluminium oxide, diatomite, and waste gas is generally 200 ~ 20000h by the volume space velocity of hydrocarbon concentration homogenizing zone
-1, preferably 500 ~ 10000h
-1.Specifically can determine according to the composition of waste gas, change in concentration situation etc., in general, unit scale required when air speed is large is little, but concentration homo-effect is slightly poor; Air speed hour, unit scale is large, and concentration homo-effect is good.
In the inventive method, desulfurization section and hydrocarbon concentration homogenizing zone and pretreatment section can be arranged in one apparatus, also can be successively set in two or more devices.Desulfurizing agent needed the desulfurizing agent that more renews after losing efficacy, and performance and the consumption of service life of desulfurizing agent and waste gas medium sulphide content concentration and desulfurizing agent are relevant.The service life of hydrocarbon concentration homogenized material is longer, does not need to change, after inefficacy also can by heating, vacuumize or pass into the modes such as hot logistics and recover concentration homogenizing performance.
Find through research, the average hydro carbons concentration in discharged exhaust gas in sewage disposal field some cycles meets discharge standard, and only under less abnormal condition, hydro carbons discharge does not meet emission request.Concentration unstable hydrocarbon class, by arranging hydrocarbon concentration homogenizing zone, is all turned to the concentration of stable equilibrium by the present invention, does not need other to process, just can reach discharge standard.The principle that concentration homogenizing zone plays concentration homogenization is: adsorbent has adsorption and desorption effect to hydro carbons, if hydrocarbons is stablized in waste gas, and the adsorption and desorption of adsorbent to hydrocarbons is in poised state, so, waste gas is by after adsorbent bed, and hydro carbons concentration does not change; Suppose in this state, the hydro carbons concentration in waste gas raises suddenly, and so, original adsorption and desorption balance is destroyed, and adsorbent starts the adsorbance increasing hydro carbons, and therefore, by adsorbent bed, the hydro carbons concentration in waste gas can decrease; Otherwise the hydro carbons concentration in waste gas reduces suddenly, and adsorbent starts desorb hydrocarbon materials, can be increased to some extent by the hydrocarbons concentration in the waste gas after adsorbent bed.Therefore, the effect of hydro carbons concentration in homogenizing discharge gas is created.
When adopting common solid desulfurating agent and adsorbent to process sewage farm discharge gas, through after a period of time, often there is the phenomenon that growth of microorganism produces foundry loam in solid desulfurating agent and adsorbent, the serviceability of desulfurizing agent and adsorbent is caused to decline, the phenomenon of bed blocking can be there is time serious, solid desulfurating agent and adsorbent were lost efficacy, and emission-control equipment can not long period steady running.The present invention is found by research, by discharged exhaust gas in sewage disposal field temperature is slightly raised, although this temperature is still in suitable micro-organisms growth temperature range, effectively can control growth of microorganism, and then ensure the steady running of the present invention's main emission-control equipment long period.Its main cause may be, the waste gas of sewage farm discharge have passed through the abundant Long contact time with sewage, and a large amount of water vapours is evaporated in discharging waste gas, makes vapour content in discharging waste gas very high.Generally, the temperature in sewage farm is higher than environment temperature, therefore the temperature of discharging waste gas is also higher than environment temperature, when combustion gas enters aftertreatment device, it constantly declines along with temperature, and now water vapour wherein can be condensed into liquid phase water in emission-control equipment, and a small amount of microorganism in waste gas, can be carried secretly, microorganism in the presence of water, understands smooth flourish, and then produces the operation that microorganism viscosity mud affects emission-control equipment.In the inventive method, after waste gas enters emission-control equipment, by suitable intensification, although the temperature raised is not high, but effectively can reduce the condensation of water vapour in waste gas, when there is not liquid phase water, microorganism can not effectively grow, and avoids desulfurizing agent that growth of microorganism causes and the phenomenon that adsorbent lost efficacy produces.The mode that the inventive method uses catalytic combustion tail gas directly to mix with discharged exhaust gas in sewage disposal field, do not need to increase equipment investment, also do not increase operating cost, the economy of emission-control equipment is given prominence to.
Accompanying drawing explanation
Fig. 1 is the apparatus structure schematic diagram that sewage farm of the present invention waste gas processing method uses;
Wherein: 1-discharged exhaust gas in sewage disposal field, 2-pretreatment section spray liquid, 3-desulfurization section, 4-hydrocarbon concentration homogenizing zone, 5-discharging waste gas, 6-catalytic combustion system emission.
Detailed description of the invention
Technology contents and the effect of processing method of the present invention is further illustrated below in conjunction with accompanying drawing.
As shown in Figure 1, first discharged exhaust gas in sewage disposal field 1 adopts packing layer to carry out spray washing pretreatment, and remove the impurity such as the mud mist carried secretly in waste gas, pretreatment section spray liquid 2 can use industry water, and pretreatment section can also remove a small amount of sulfide etc.To mix with catalytic combustion system emission 6 through pretreated waste gas and heat up, then successively by desulfurization section 3 and hydrocarbon concentration homogenizing zone 4, last discharging waste gas 5 is discharged.Scheme and the effect of the inventive method is further illustrated below in conjunction with embodiment.
Embodiment 1
Sulfur compound 20mg/m in certain sewage farm, oil refining enterprise activated sludge aeration pond loss waste gas
3left and right, hydrocarbons 2 ~ 150mg/m
3(normal value is 10mg/m in left and right
3below, 100mg/m can be reached during damage
3left and right), flow is 20000Nm
3about/h.Adopt technological process as shown in Figure 1, spray pretreatment section uses industry water, and liquid gas volume ratio is 1L/m
3.Row's discharge temperature after the process of spray pretreatment section is 28 DEG C.
The temperature of catalytic combustion system tail gas is 120 DEG C, is 40 DEG C, enters desulfurization section with the pretreated sewage farm mixed mixture temperature of waste gas.
The active carbon (NaOH accounts for 20% of activated carbon weight by weight) of desulfurization section working load NaOH, desulfurization section volume space velocity is 8000h
-1.
Hydrocarbon concentration homogenizing zone uses commercially available dewatering silica gel for concentration homogenized material, hydrocarbon concentration homogenizing zone volume space velocity 1000h
-1.
Show through long period (more than 6 months) test, although there is damage, after the inventive method process, discharge the sulfide concentration of gas all lower than 1mg/m
3, hydrocarbon concentration is all lower than 10mg/m
3, discharge gas does not have obvious stench taste, and emission-control equipment pressure drop is not risen, and after off-test, desulfurization section and concentration homogenizing zone all do not produce obvious microorganism viscosity mud.
Comparative example 1
According to method and the condition of embodiment 1, just without with catalytic combustion system tail gas mixing heating step.After running in 60 days, emission-control equipment pressure drop is obviously risen, and exhaust-gas treatment successful reduces, and after off-test, the desulfurizing agent bed of desulfurization section has obvious microorganism viscosity mud, plugs desulfurizing agent bed.
Embodiment 2
Certain petrifaction sewage Treatment stations biochemical aeration tank discharging waste gas, sulfide 5mg/m
3left and right, hydro carbons concentration is generally 5mg/m
3left and right, sometimes may more than 50mg/m
3left and right.
Adopt technological process as shown in Figure 1, spray pretreatment section uses industry water, and liquid gas volume ratio is 0.5L/m
3.Row's discharge temperature after the process of spray pretreatment section is 25 DEG C.
The temperature of catalytic combustion system tail gas is 120 DEG C, is 45 DEG C, enters desulfurization section with the pretreated sewage farm mixed mixture temperature of waste gas.
Desulfurization section uses FeOOH desulfurizer (the method preparation by described in CN200810112428.X embodiment 1), and desulfurization section volume space velocity is 1000h
-1.
Hydrocarbon concentration homogenizing zone uses commercially available de-hydrocarbon to be concentration homogenized material, hydrocarbon concentration homogenizing zone volume space velocity 10000h
-1.
Show through long period (more than 6 months) test, although there is damage, after the inventive method process, discharge the sulfide concentration of gas all lower than 1mg/m
3, hydrocarbon concentration is all lower than 10mg/m
3, discharge gas does not have obvious stench taste, and emission-control equipment pressure drop is not risen, and after off-test, desulfurization section and concentration homogenizing zone all do not produce obvious microorganism viscosity mud.
Embodiment 3
According to process and the handling object of embodiment 1, just cancel spray pretreatment section, the temperature of discharged exhaust gas in sewage disposal field is 31 DEG C.
The temperature of catalytic combustion system tail gas is 120 DEG C, is 42 DEG C, enters desulfurization section with the pretreated sewage farm mixed mixture temperature of waste gas.
The active carbon (NaOH accounts for 20% of activated carbon weight by weight) of desulfurization section working load NaOH, desulfurization section volume space velocity is 5000h
-1.
Hydrocarbon concentration homogenizing zone uses commercially available dewatering silica gel for concentration homogenized material, hydrocarbon concentration homogenizing zone volume space velocity 2000h
-1.
Show through long period (more than 6 months) test, although there is damage, after the inventive method process, discharge the sulfide concentration of gas all lower than 1mg/m
3, hydrocarbon concentration is all lower than 10mg/m
3, discharge gas does not have obvious stench taste, and emission-control equipment pressure drop is not risen, and after off-test, desulfurization section and concentration homogenizing zone all do not produce obvious microorganism viscosity mud.
Comparative example 2
According to method and the condition of embodiment 3, just without with catalytic combustion system tail gas mixing heating step.After running in 30 days, emission-control equipment pressure drop is obviously risen, and exhaust-gas treatment successful reduces, and after off-test, the desulfurizing agent bed of desulfurization section has obvious microorganism viscosity mud, plugs desulfurizing agent bed.
Claims (10)
1. the processing method of a discharged exhaust gas in sewage disposal field, it is characterized in that comprising following content: discharged exhaust gas in sewage disposal field utilizes catalytic combustion system tail gas or other high-temperature flue gas to heat up 2 ~ 40 DEG C, then through desulfurization section and the discharge of hydrocarbon concentration homogenizing zone, desulfurization section uses solid desulfurating agent, hydrocarbon concentration homogenizing zone uses the material with concentration homogenization, wherein adsorbent not only has suction-operated to hydro carbons, also has desorption, and makes to maintain near poised state to the absorption of hydro carbons and parsing; Described sewage farm is biochemical aeration formula sewage farm, and desulfurization section uses that the active component of solid desulfurating agent is iron oxide, one or more in zinc oxide, NaOH, potassium hydroxide, calcium hydroxide, magnesium hydroxide, cupric oxide and FeOOH.
2. in accordance with the method for claim 1, it is characterized in that: through desulfurization section and the discharge of hydrocarbon concentration homogenizing zone after discharged exhaust gas in sewage disposal field intensification 5 ~ 25 DEG C.
3. according to the method described in claim 1 or 2, it is characterized in that: first discharged exhaust gas in sewage disposal field carries out pretreatment through pretreatment section, and then heat up through desulfurization section and the discharge of hydrocarbon concentration homogenizing zone.
4. in accordance with the method for claim 3, it is characterized in that: pretreatment adopts packed tower to carry out the pretreatment mode washed with industry water.
5. in accordance with the method for claim 1, it is characterized in that: adopt discharged exhaust gas in sewage disposal field and catalytic combustion system tail gas or other high-temperature flue gas, adopt and directly to mix or the mode of heat exchange heats up.
6. in accordance with the method for claim 1, it is characterized in that: waste gas is 200 ~ 10000h by the volume space velocity of desulfurization section
-1.
7. in accordance with the method for claim 1, it is characterized in that: waste gas is 300 ~ 5000h by the volume space velocity of desulfurization section
-1.
8. in accordance with the method for claim 1, it is characterized in that: the material with concentration homogenization that hydrocarbon concentration homogenizing zone uses is the combination of one or more in active carbon, molecular sieve, silica gel, aluminium oxide and diatomite.
9. according to the method described in claim 1 or 8, it is characterized in that: waste gas is 200 ~ 20000h by the volume space velocity of hydrocarbon concentration homogenizing zone
-1.
10. according to the method described in claim 1 or 8, it is characterized in that: waste gas is 500 ~ 10000h by the volume space velocity of hydrocarbon concentration homogenizing zone
-1.
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| CN108246061A (en) * | 2016-12-29 | 2018-07-06 | 中国石油天然气集团公司 | The processing method for the exhaust gas containing VOCs that a kind of loss of sewage lifting pond goes out |
| CN108246064A (en) * | 2016-12-29 | 2018-07-06 | 中国石油天然气集团公司 | A kind of comprehensive purifying method for the exhaust gas containing VOCs that sewage farm loss goes out |
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| JP2007144298A (en) * | 2005-11-28 | 2007-06-14 | Shiyoutetsu Kin | Efficient flue gas desulfurization method and apparatus |
| CN100496678C (en) * | 2006-04-25 | 2009-06-10 | 中国石油化工股份有限公司 | Combined purification method for effluvial exhaust air |
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