1 After turning off the adjustment tank aeration part of the lift pump, resulting in a decrease in the mixing and mixing of the original water in the adjustment pool, and reducing the capacity of the regulating tank to degrade sewage pollutants, so that the concentration of pollutants raised to the mixing tank is increased, Increased organic load in the later period. (Note: The adjusted pool area is about 15,000 square meters, and the height is 2 meters. Before most of the whole pool was aerated, most of the rear diversion wall was down, only a small part and the aeration at the lift pump! Before the wastewater treatment plant's filter press was broken, there was no pressure sludge, and the sludge was directly discharged into the conditioning tank after the sludge concentration tank.So I estimate that the sediment sludge in the conditioning tank is more than 1 meter, that is to say, turn off the exposure. After the gas, the raw water is basically flowed from the mud surface and then directly pumped up to the mixing pool for dosing.) (As we all know, the wastewater from the wastewater treatment plant is a very complicated printing and dyeing wastewater, plus a regulating diversion wall diversion The bottom sludge is very high, so aeration is very necessary. Aeration can make pool water pollutants evenly distributed and play a pre-productive role because aerobic treatment efficiency is an order of magnitude higher than anaerobic treatment efficiency. That is, the anaerobic treatment is 10 times faster, and it can degrade COD more quickly and consume contaminants such as sulfides, and it can also oxidize the reducing materials in advance! So I think that turning off the aeration is a very important factor that makes the quality of the effluent water worse. The factors) 2. Since the adjustment tank aeration is turned off, the total gas volume does not decrease, causing the biogas pool gas volume to be excessively large for a short period of time, and the microorganisms on the packing material are washed away, resulting in a reduction of microorganisms in the biochemical pool and a decrease in treatment efficiency. At the same time, due to the bacteria and micelles in the biochemical pool, too much debris from the floc causes the sand filter load to be too high and a part of it flows out with the outflow, resulting in a short time COD discharge. 3. After the COD rises, on the one hand, it urges the upstairs mixing pool operator to increase the dose to improve the treatment conditions of the mixing pool, plus the adjustment pool treatment efficiency decreases, which leads to an increase in the salinity of the mixed pool outlet water, and thus the salt content of the biochemical pool. Too high, this inhibits the microbial activity in the biochemical pool and reduces the efficiency of the biochemical pool treatment. The second reason is that the anaerobic pond contains too much mud in the second compartment and plans to take measures to drain the mud. (I think that the reason for the analysis is wrong. The mud in the anaerobic tank is cumulative. It is impossible to bring impact load to the system in a short time and cause the COD of the effluent to rise rapidly.) 4. After a period of time, the system self-regulates and recovers (the biochemical pool adapts to the influent water quality and aeration intensity, etc.), plus the addition of the water purification king, bleaching water, and the responsible person's treatment of the sludge in the two anaerobic ponds. With certain results, the water quality of the effluent after the 23rd has slowly returned to normal. However, due to the problem of regulating the sludge in the pool, the water raised to the mixing tank contains more mud and the pollutant concentration is higher. In addition, after the system is restored to a certain degree, the person in charge later orders the operator to reduce the amount of the drug in the mixing tank to save the drug charges, resulting in a decrease in the materialization efficiency, a poor separation effect of the cement water in the mixed tank, and the efficiency of the biochemical tank treatment. The reasons for these limitations are that the system operation is unstable due to several reasons, and the quality of effluent water fluctuates with the raw water quality. The top of the form now describes the problem: 1. Chromaticity problem: The test data is as follows: At 8 o'clock on the morning of January 22, samples are taken: a deep blue water of the sedimentation tank, chroma 150 times, blue-green after filtration, and chroma 45 times ( Note: The experimental conditions are very simple, visual inspection of the dilution factor method, and the use of medium-speed quantitative filter paper--the stupid method may not be of much significance.) The anaerobic tank water is blue-black, with 200-times chroma, yellow-green after filtration, and 65-fold chroma. Samples were taken at 9 o'clock on the morning of January 23rd: The entrance of the pool was adjusted to black, chroma was 800 times, and the filter was blue-black, and the chroma was 200 times. The color of the sedimentation pond was dark blue, the color was 150 times, and the filtered blue color was 53 times the color. Anaerobic tank water blue and black, color 220 times, filtered blue, color 70 times (turn yellow after placing for a while) outlet outlet bright yellow, color 65 times, filtered yellow, color 43 times 1 On the morning of the 28th, on the morning of the 28th, there was a sink in the sinking pond that was bright green. At 10:30 sampling, the chroma was 58 times. The color of the other 7 sinks was relatively deep. At this time, the discharge outlet was yellow, and the chroma was 73 times. The color problem of printing and dyeing wastewater has plagued many water users, and I am also very confused about this. According to the actual situation, most of the color water in the wastewater treatment plant of my wastewater plant is bright yellow when it is good, yellow when it is poor, and yellow or green when it is worst. dark green. I analyzed the reasons there are two, one is the conversion of Fe2+ ions into Fe3+ yellow, and the other is the return of yellow caused by various dyes into the water. This involves the role of a hidden color such as PH, there is the anaerobic broken health is not completely, causing the problem of oxidation after the color return.
2, PH problem. The test data is as follows: Introduction: The anaerobic tank is followed by the biological contact oxidation tank, which is divided into two levels of water, because the old pond was designed to process 5 kilotons/day. Later, the anaerobic pond plus biochemical pool same as the old system was added for the expansion treatment. (However, one difference is that the two biochemical tanks are different in packing. This point will be mentioned later.) From both sides of the water in a sink, enter the old and new systems. Each stage of biochemical pool is divided into 12 long grids to run. January 24 (Between several times before this time, because the data sheet was not taken, do not write it, but it probably means that the water from the first grid is about 9 to 12 grids and the water dropped to 8 or higher). 1 cell water PH=8.99 3rd cell water PH=8.82 5th cell water PH=8.66 7th cell water PH=8.33 9th cell water PH=8.03 old cell, 1st cell water PH=9.05 3rd cell water PH= 8.73 pH of the 5th cell PH = 8.43 pH of the 7th cell PH = 8.03 pH of the 9th cell PH = 8.12 pH of the 11th cell PH = 8.022 On the 4th of January, most companies did not produce water, the influent water was clear, and the mixing pond was not administered. 10 points start sampling --- new pool, the first grid of water PH = 9.96 the third grid of water PH = 9.95 the fifth grid of water PH = 9.71 the seventh grid of water PH = 9.53 the 9 grid of water PH = 9.28 the 11 grid of water PH =9.1410 points 20 samples --- the old pool, the first effluent PH = 9.79 The third effluent PH = 9.43 the fifth effluent PH = 9.09 the seventh effluent PH = 8.44 the quartile of the 9th PH = 8.33 the 11th effluent PH = 8.23 ​​(The effluent of a sinking pond has been mixed with the returned sludge water for a certain period of time, so the pH of the old pond inlet is relatively low). The comparison shows that the old pond is better than Xinchi, and the microbial self PH is better. This is below. This is illustrated in the efficiency test. The above simple data can also show that the pH of anaerobic and biochemical pools is at a relatively high level, especially in the anaerobic pond PH. I feel very serious when I arrive at the wastewater treatment plant, because I started to find that the influent water flows into the mixing tank after adjusting tanks. After the drug treatment, the pH is generally 9:00 to 10:00. If it is lower than 8:5 or 8 then the operator must add caustic soda to increase the PH value. The book says that 6 to 9 are required for microbial growth. The environment, preferably between 6.5 and 8.5, or in the middle, here it is estimated that the pH of the anaerobic after entering the sedimentation tank is generally between 9:00 and 10:00. Finally, the contact oxidation tank is also at least 9 or higher. In this case, the efficiency of microbial growth is affected by the low efficiency. I asked the foreman on this issue. He said it was unclear. Anyway, he knew that after one year of commissioning, the PH would be higher, the water would be better, and the PH would be less watery. it is good. He said that once an engineer came over to him, the engineer did not know how to explain it. This is strange. According to my analysis, it is estimated that it is due to the addition of ferrous iron. The higher PH is favorable to the conversion of ferrous iron to trivalent iron, and the flocculation effect is better. It also facilitates later precipitation to reduce the salinity of the biochemical pool. The initial pH may be higher when the microorganisms have adapted to high PH. But I think that from 9:00 to 10:00, and sometimes even 11 o'clock a few moments, the impact of such a high pH on the back anaerobic and biochemical pools is self-evident! The processing effect will certainly be discounted, which is what I do The COD efficiency experiment can be seen in the experiment. 3. System efficiency problems Due to the approaching New Year's Day on February 4th, many companies stopped production, so the influent COD was about 200 or so, the comparison was clear, the mixing pool was not administered, and the COD efficiency test was conducted at 2 o'clock in the afternoon. Sample Influent COD=204 PH=10.75 Sand Filter tank new pond water (behind the new pond of biochemical pond) COD=136.6 PH=9.06 Old sand filter pond water (behind old pond of biochemical pond) COD=71.3 PH=8.16 Here we can see that the new pond efficiency is obviously lower than the old one The pool, new anaerobic pool + biochemical pool together only 33% efficiency, the old anaerobic pool + biochemical pool was 65%, the overall poor, on the one hand PH is too high, there are other factors such as adjusting the pool. The new pool uses fiber bundle fillers, the old pool is a single rectangular combination of fillers, and the non-horizontal aeration head assembly also affects its efficiency. In addition, the new pond effluent suspended solids are small and small, and the old ponds are more coarse and more. It is estimated that the new pond is not well packed and the aeration is not uniform (in some places there is no aeration). There is also the possibility that the microorganisms in the new pond are unfavorable due to unsuitable conditions. The legendary filamentous bacteria in contact with the oxidation tank expand, so that large floes cannot be seen.
1 After turning off the adjustment tank aeration part of the lift pump, resulting in a decrease in the mixing and mixing of the original water in the adjustment pool, and reducing the capacity of the regulating tank to degrade sewage pollutants, so that the concentration of pollutants raised to the mixing tank is increased, Increased organic load in the later period. (Note: The adjusted pool area is about 15,000 square meters, and the height is 2 meters. Before most of the whole pool was aerated, most of the rear diversion wall was down, only a small part and the aeration at the lift pump! Before the wastewater treatment plant's filter press was broken, there was no pressure sludge, and the sludge was directly discharged into the conditioning tank after the sludge concentration tank.So I estimate that the sediment sludge in the conditioning tank is more than 1 meter, that is to say, turn off the exposure. After the gas, the raw water is basically flowed from the mud surface and then directly pumped up to the mixing pool for dosing.) (As we all know, the wastewater from the wastewater treatment plant is a very complicated printing and dyeing wastewater, plus a regulating diversion wall diversion The bottom sludge is very high, so aeration is very necessary. Aeration can make pool water pollutants evenly distributed and play a pre-productive role because aerobic treatment efficiency is an order of magnitude higher than anaerobic treatment efficiency. That is, the anaerobic treatment is 10 times faster, and it can degrade COD more quickly and consume contaminants such as sulfides, and it can also oxidize the reducing materials in advance! So I think that turning off the aeration is a very important factor that makes the quality of the effluent water worse. The factors) 2. Since the adjustment tank aeration is turned off, the total gas volume does not decrease, causing the biogas pool gas volume to be excessively large for a short period of time, and the microorganisms on the packing material are washed away, resulting in a reduction of microorganisms in the biochemical pool and a decrease in treatment efficiency. At the same time, due to the bacteria and micelles in the biochemical pool, too much debris from the floc causes the sand filter load to be too high and a part of it flows out with the outflow, resulting in a short time COD discharge. 3. After the COD rises, on the one hand, it urges the upstairs mixing pool operator to increase the dose to improve the treatment conditions of the mixing pool, plus the adjustment pool treatment efficiency decreases, which leads to an increase in the salinity of the mixed pool outlet water, and thus the salt content of the biochemical pool. Too high, this inhibits the microbial activity in the biochemical pool and reduces the efficiency of the biochemical pool treatment. The second reason is that the anaerobic pond contains too much mud in the second compartment and plans to take measures to drain the mud. (I think that the reason for the analysis is wrong. The mud in the anaerobic tank is cumulative. It is impossible to bring impact load to the system in a short time and cause the COD of the effluent to rise rapidly.) 4. After a period of time, the system self-regulates and recovers (the biochemical pool adapts to the influent water quality and aeration intensity, etc.), plus the addition of the water purification king, bleaching water, and the responsible person's treatment of the sludge in the two anaerobic ponds. With certain results, the water quality of the effluent after the 23rd has slowly returned to normal. However, due to the problem of regulating the sludge in the pool, the water raised to the mixing tank contains more mud and the pollutant concentration is higher. In addition, after the system is restored to a certain degree, the person in charge later orders the operator to reduce the amount of the drug in the mixing tank to save the drug charges, resulting in a decrease in the materialization efficiency, a poor separation effect of the cement water in the mixed tank, and the efficiency of the biochemical tank treatment. The reasons for these limitations are that the system operation is unstable due to several reasons, and the quality of effluent water fluctuates with the raw water quality. The top of the form now describes the problem: 1. Chromaticity problem: The test data is as follows: At 8 o'clock on the morning of January 22, samples are taken: a deep blue water of the sedimentation tank, chroma 150 times, blue-green after filtration, and chroma 45 times ( Note: The experimental conditions are very simple, visual inspection of the dilution factor method, and the use of medium-speed quantitative filter paper--the stupid method may not be of much significance.) The anaerobic tank water is blue-black, with 200-times chroma, yellow-green after filtration, and 65-fold chroma. Samples were taken at 9 o'clock on the morning of January 23rd: The entrance of the pool was adjusted to black, chroma was 800 times, and the filter was blue-black, and the chroma was 200 times. The color of the sedimentation pond was dark blue, the color was 150 times, and the filtered blue color was 53 times the color. Anaerobic tank water blue and black, color 220 times, filtered blue, color 70 times (turn yellow after placing for a while) outlet outlet bright yellow, color 65 times, filtered yellow, color 43 times 1 On the morning of the 28th, on the morning of the 28th, there was a sink in the sinking pond that was bright green. At 10:30 sampling, the chroma was 58 times. The color of the other 7 sinks was relatively deep. At this time, the discharge outlet was yellow, and the chroma was 73 times. The color problem of printing and dyeing wastewater has plagued many water users, and I am also very confused about this. According to the actual situation, most of the color water in the wastewater treatment plant of my wastewater plant is bright yellow when it is good, yellow when it is poor, and yellow or green when it is worst. dark green. I analyzed the reasons there are two, one is the conversion of Fe2+ ions into Fe3+ yellow, and the other is the return of yellow caused by various dyes into the water. This involves the role of a hidden color such as PH, there is the anaerobic broken health is not completely, causing the problem of oxidation after the color return.
2, PH problem. The test data is as follows: Introduction: The anaerobic tank is followed by the biological contact oxidation tank, which is divided into two levels of water, because the old pond was designed to process 5 kilotons/day. Later, the anaerobic pond plus biochemical pool same as the old system was added for the expansion treatment. (However, one difference is that the two biochemical tanks are different in packing. This point will be mentioned later.) From both sides of the water in a sink, enter the old and new systems. Each stage of biochemical pool is divided into 12 long grids to run. January 24 (Between several times before this time, because the data sheet was not taken, do not write it, but it probably means that the water from the first grid is about 9 to 12 grids and the water dropped to 8 or higher). 1 cell water PH=8.99 3rd cell water PH=8.82 5th cell water PH=8.66 7th cell water PH=8.33 9th cell water PH=8.03 old cell, 1st cell water PH=9.05 3rd cell water PH= 8.73 pH of the 5th cell PH = 8.43 pH of the 7th cell PH = 8.03 pH of the 9th cell PH = 8.12 pH of the 11th cell PH = 8.022 On the 4th of January, most companies did not produce water, the influent water was clear, and the mixing pond was not administered. 10 points start sampling --- new pool, the first grid of water PH = 9.96 the third grid of water PH = 9.95 the fifth grid of water PH = 9.71 the seventh grid of water PH = 9.53 the 9 grid of water PH = 9.28 the 11 grid of water PH =9.1410 points 20 samples --- the old pool, the first effluent PH = 9.79 The third effluent PH = 9.43 the fifth effluent PH = 9.09 the seventh effluent PH = 8.44 the quartile of the 9th PH = 8.33 the 11th effluent PH = 8.23 ​​(The effluent of a sinking pond has been mixed with the returned sludge water for a certain period of time, so the pH of the old pond inlet is relatively low). The comparison shows that the old pond is better than Xinchi, and the microbial self PH is better. This is below. This is illustrated in the efficiency test. The above simple data can also show that the pH of anaerobic and biochemical pools is at a relatively high level, especially in the anaerobic pond PH. I feel very serious when I arrive at the wastewater treatment plant, because I started to find that the influent water flows into the mixing tank after adjusting tanks. After the drug treatment, the pH is generally 9:00 to 10:00. If it is lower than 8:5 or 8 then the operator must add caustic soda to increase the PH value. The book says that 6 to 9 are required for microbial growth. The environment, preferably between 6.5 and 8.5, or in the middle, here it is estimated that the pH of the anaerobic after entering the sedimentation tank is generally between 9:00 and 10:00. Finally, the contact oxidation tank is also at least 9 or higher. In this case, the efficiency of microbial growth is affected by the low efficiency. I asked the foreman on this issue. He said it was unclear. Anyway, he knew that after one year of commissioning, the PH would be higher, the water would be better, and the PH would be less watery. it is good. He said that once an engineer came over to him, the engineer did not know how to explain it. This is strange. According to my analysis, it is estimated that it is due to the addition of ferrous iron. The higher PH is favorable to the conversion of ferrous iron to trivalent iron, and the flocculation effect is better. It also facilitates later precipitation to reduce the salinity of the biochemical pool. The initial pH may be higher when the microorganisms have adapted to high PH. But I think that from 9:00 to 10:00, and sometimes even 11 o'clock a few moments, the impact of such a high pH on the back anaerobic and biochemical pools is self-evident! The processing effect will certainly be discounted, which is what I do The COD efficiency experiment can be seen in the experiment. 3. System efficiency problems Due to the approaching New Year's Day on February 4th, many companies stopped production, so the influent COD was about 200 or so, the comparison was clear, the mixing pool was not administered, and the COD efficiency test was conducted at 2 o'clock in the afternoon. Sample Influent COD=204 PH=10.75 Sand Filter tank new pond water (behind the new pond of biochemical pond) COD=136.6 PH=9.06 Old sand filter pond water (behind old pond of biochemical pond) COD=71.3 PH=8.16 Here we can see that the new pond efficiency is obviously lower than the old one The pool, new anaerobic pool + biochemical pool together only 33% efficiency, the old anaerobic pool + biochemical pool was 65%, the overall poor, on the one hand PH is too high, there are other factors such as adjusting the pool. The new pool uses fiber bundle fillers, the old pool is a single rectangular combination of fillers, and the non-horizontal aeration head assembly also affects its efficiency. In addition, the new pond effluent suspended solids are small and small, and the old ponds are more coarse and more. It is estimated that the new pond is not well packed and the aeration is not uniform (in some places there is no aeration). There is also the possibility that the microorganisms in the new pond are unfavorable due to unsuitable conditions. The legendary filamentous bacteria in contact with the oxidation tank expand, so that large floes cannot be seen.
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