CN105236701A - Method for dehydrating sludge by utilizing bioleaching sludge co-conditioning - Google Patents
Method for dehydrating sludge by utilizing bioleaching sludge co-conditioning Download PDFInfo
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Abstract
The invention provides a method for dehydrating sludge by utilizing bioleaching sludge co-conditioning. The method comprises: adding leached biological sludge which is reacted into primary sludge to obtain a mixed liquid, so as to neutralize surface negative charge of the primary sludge particles by utilizing biological acidification of the leached biological sludge; regulating the pH value of the obtained primary sludge mixed liquid to be 3-4; adding ferrous sulfate crystals into the primary sludge mixed liquid; dissolving the ferrous sulfate crystals by stirring to obtain a mixture; then adding peroxides into the obtained mixture, ferrous ions in the ferrous sulfate crystals and the peroxides will combine under an acidic condition to form hydroxyl radicals with strong oxidization, the strong oxidization action is utilized during the reaction to damage and strip microbial cells and extracellular polymeric substances in the primary sludge, and release water inside the microbial cells and bound water on the surfaces of the extracellular polymeric substances; and carrying out solid-liquid separating and dehydrating treatment on the primary sludge mixed liquid by utilizing a high-pressure diaphragm plate-and-frame filter press, thereby obtaining dehydrated sludge with moisture content lower than 55%.
Description
Technical field
The present invention relates to environment project and technical field of sludge treatment, particularly relate to a kind of method utilizing bioleaching mud co-conditioning to carry out sludge dewatering.
Background technology
Along with the fast development in recent years of China's urban wastewater treatment industry, sludge yield also gets more and more, and the subsequent disposal of mud has become a difficult problem for many urban wastewater treatment firms, therefore improves dehydration property, can sludge reduction be realized, there is good economic benefit and environmental protection social benefit.
A kind of conventional sludge disposal technology is sludge conditioning, sludge conditioning can change the physics and chemistry character of mud, but the dewatered sludge water ratio finally produced due to it is higher, general water ratio is about 80%, sludge yield is very large, and difficulty is disposed in the follow-up transport of the dewatered sludge of generation, and is difficult to recycling, mud joint disposal costly, the environmental requirement that very difficult adaptation is more and more higher.And the final mud produced has very large foreign odor taste, and the Working environment of process for producing is poor, does not also have effective germicidal treatment.
A kind of sludge organism of recent appearance nurses one's health new bioleaching technology, refer to by thickened sludge by mushroom microorganism (such as, ferrous thiobacillus, thiobacillus ferrooxidans etc.) etc. multiple-microorganism when aerobic, act on mud, break the flucculation structure of mud, improve the settling property of mud, thus change the dewatering of mud, reach the object of sludge dewatering successful, realize the degree of depth mummification of mud.
But will through the biological respinse conditioning of 40 hours, drop leaching treating pond is invested and takes up an area more, and the conditioning of drop soaking technology biology needs aeration aerating power consumption more, and running cost is higher.Bioleaching technique is grasped and is controlled more complicated, needs certain study and training, and wants the practical work experience of long period just can better red-tape operati.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method utilizing bioleaching mud co-conditioning to carry out sludge dewatering, solves the problems of the technologies described above all to solve rear section.
In order to solve the problem, the invention discloses a kind of method utilizing bioleaching mud co-conditioning to carry out sludge dewatering, comprising:
The drop leaching biological sludge reacted is added to primary sludge, the biological acidification utilizing described drop to soak biological sludge on the surface negative charge of described primary sludge particle, the volume ratio that described primary sludge and described drop soak biological sludge is (0.5:1)-(1:1), and the water ratio of described primary sludge is 93%-97%;
The pH value adjusting the primary sludge mixed solution obtained is 3-4;
Ferrous sulfate crystal is added in described primary sludge, after stirring and dissolving, add superoxide, described ferrous sulfate crystal ferrous ions and described superoxide are combined to form the hydroxyl radical free radical of tool strong oxidation in acid condition, utilize its strong oxidizing property to destroy and peel off microorganism cells and Extracellular polymers in described primary sludge, discharge described microorganism cells internal water and described Extracellular polymers surface-bonded water, the mass concentration of described ferrous sulfate crystal is 85%-90%, the mass ratio of the oven-dry weight of described ferrous sulfate crystal and described primary sludge is 5%-10%, the mass concentration of described superoxide is 27.5%-30%, the mass ratio of the oven-dry weight of described superoxide and described primary sludge and 8%-10%,
By autoclave diaphragm plate-and-frame filter press, solid-liquid separation dehydration process is carried out to described primary sludge mixed solution, obtain the dewatered sludge that water ratio is less than 55%.
Preferably, described ferrous sulfate crystal is ferrous sulfate or Feromax.
Preferably, described superoxide is hydrogen peroxide or SPC-D.
Preferably, pH value≤4 of described drop leaching biological sludge.
Preferably, the time of stirring after adding described ferrous sulfate crystal is 5-10 minute, and the time of stirring after adding described superoxide is 15-30 minute, and described method is 0.5-1 hour consuming time altogether.
Preferably, the pH value of described adjustment primary sludge is that 3-4 comprises:
Utilize online pH meter to measure to add the pH value of mixing sludge after described drop leaching biological sludge;
In described mixing sludge, add technical grade sulfuric acid, stir 3-5 minute, adjust ph is between 3-4, and described technical grade h 2 so 4 concentration is 93%-98%.
Preferably, when stirring, mechanical stirring or pressurized air is adopted to stir.
Preferably, described method also comprises:
The first heavy mud conditioning of next batch is carried out, to realize sequence batch (circular treatment according to the timed interval of presetting.
Compared with prior art, the present invention includes following advantage:
The drop leaching mud reacted is utilized to be added in the water ratio 93-97% primary sludge of town sewage plant generation, by drop leaching mud biological acidification on mud granule surface negative charge, adding a small amount of mineral acid again regulates the pH of primary sludge mixed solution within the scope of 3.0-4.0, add ferrous sulfate crystal and superoxide again, the oxidative damage utilizing it to be combined to form the hydroxyl radical free radical of tool strong oxidation in acid condition peels off microorganism cells and Extracellular polymers in mud, by aforesaid method by the most surfaces planar water release in mud, the dehydration property of the first heavy mud of efficient improvement.Eventually pass the semi-oriented mud that barrier film plate-and-frame filter press processed obtains water ratio less than 55%, than conventional sludge treatment decrement 1/2-2/3, for follow-up recycling and disposal provide better condition.
Meanwhile, in dehydration, the foreign odor taste of mud is eliminated, and the harmful levels of pathogens such as intestinal bacteria are significantly killed, and reach primary sludge mixed solution dehydration property and nurse one's health the object with effective sterilization fast.
Whole conditioning process time is 0.5-1 hour, can fast processing primary sludge mixed solution, needed for conditioner, volume is less, greatly save and take up an area and initial cost, process of simultaneously nursing one's health does not need long-time aeration, just short period of time conventional mechanical or pressurized air stir, and significantly save and run power consumption, production cost is lower.
Further, after the mud of this batch of co-conditioning all enters into autoclave diaphragm plate-and-frame filter press, the first heavy mud conditioning of next batch can be carried out, sequence batch (circular treatment, and arbitrary time span can be taked according between the condition of production two batches, technology controlling and process is simple, easily grasps operation.
In sum, the embodiment of the present invention can significantly improve the dehydration property of primary sludge, fast processing primary sludge, reduces running cost, and realizes effective sterilization and the minimizing of primary sludge, and technology controlling and process is simple, easily grasps operation.
Accompanying drawing explanation
Fig. 1 is conventional municipal Sludge Chemical Conditioning schema;
Fig. 2 is the schematic diagram of bioleaching technology in background technology;
Fig. 3 is a kind of method flow diagram utilizing bioleaching mud co-conditioning to carry out sludge dewatering of the embodiment of the present invention;
Fig. 4 utilizes bioleaching mud co-conditioning to carry out the method schematic diagram of sludge dewatering in an example of the embodiment of the present invention.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, and below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Along with the fast development in recent years of China's urban wastewater treatment industry, more than 3000 has been had to China's town sewage plant in 2013, calculate by 80% water ratio, estimate that the generation of the annual mud of China can reach more than 3,000 ten thousand tons, dissimilar mud can be produced: be mainly primary sludge water ratio at 93%-97% and secondary sludge (being also excess sludge) water ratio about 99% according to water technology difference, usual method is that these two kinds of mud mixing are together processed (thickened sludge water ratio is at 97%-98%) after gravity concentration, according to the total of dry-matter in thickened sludge, primary sludge accounts for 30%-50%, secondary sludge accounts for 50%-70%.
In mud, organic matter degradation is few, oils degradation efficiency is poor, water ratio is high, sludge stabilization is not good, and dehydration difficulty, does not reach the requirement of subsequent disposal usually, cause the mud later stage dispose difficulty and expense too high, constrain the disposal of the minimizing of mud, innoxious, resource utilization, improve dehydration property, can sludge reduction be realized extremely important.
Conventional sludge disposal technology is Sludge Chemical Conditioning, with reference to figure 1, gives the schematic diagram of Sludge Chemical Conditioning technology in background technology, specifically can comprise:
Primary sludge and excess sludge are added sludge condensation homogeneous pond (water ratio about 98%), after adding coagulating agent+PAM or iron trichloride+lime or other chemical agents, enter Sludge Chemical Conditioning pond, through solid-liquid separation (whizzer/belt filter press), obtain dewatered sludge (water ratio 75%-85%).
The topmost technological deficiency of this technology is:
1) moisture percentage in sewage sludge that finally produces of ordinary method is high, and the final mud average moisture content produced is about 80%, and sludge output is huge, and transport constant, landfill is constant, and follow-up disposal costs is higher, comprehensive utilization difficulty.
2) mud that ordinary method finally produces has very large foreign odor taste, and the Working environment of process for producing is poor.
3) ordinary method does not carry out effective germicidal treatment.
A kind of sludge organism of recent appearance nurses one's health new bioleaching technology, with reference to figure 2, gives the schematic diagram of bioleaching technology in background technology, specifically can comprise:
By the excess sludge of sewage work and primary sludge are carried out mixing concentrated after obtain thickened sludge (water ratio about 98%), carry out blast aeration and after adding special bacteria nutrient chemical, enter 40 hours sludge bioleaching pond residence time, then after carrying out sludge modification, enter mudpan, supernatant liquor after precipitation is entered mixing pit, again enter sewage work and continue process, remainder carries out solid-liquid separation (not needing to add flocculation agent to be dewatered by specific customization sheet frame), liquid after solid-liquid separation enters mixing pit, again enter sewage work and continue process, solid part after solid-liquid separation carries out high mass dryness fraction dewatered sludge (moisture 60%, khaki color, odorless), carry out recycling.
This technology mushroom microorganism (microbial composite bacteria) used is found by professor Zhou Lixiang of Agricultural University Of Nanjing, and the specificity microorganism (see patent No. ZL02112924.X and ZL02137921.1) after improvement, training.
The above-mentioned special mushroom microorganism of inoculation (about 40 hours) reaction through after a while under given conditions in the thickened sludge (water ratio about 98%) of urban wastewater treatment firm, reach the object that sludge quality changes, mud after process can be concentrated to moisture 92% by natural gravity, volume reduces 2/3, and leaching ability of heavy metal rate reaches more than 80%.
Mud can not add any flocculation agent through mechanism filter-pressing dehydration to water content less than 60%, and dewatered sludge generation reduces more than 1/2.
In reaction process, the foul smell of mud is eliminated, and the harmful levels of pathogens such as intestinal bacteria are significantly killed.And the organic matter in mud after mummification remains unchanged substantially, remains beneficiating ingredient in mud, is convenient to follow-up recycling.
The topmost technological deficiency of this technology is:
1) although just the final sludge output of heavy mud is less for the process of drop soaking technology, and water ratio is less than 60%, is as good as stink, through the biological respinse conditioning of 40 hours, drop leaching treating pond is invested and takes up an area more.
2) conditioning of drop soaking technology biology needs aeration aerating power consumption more, and running cost is higher.
3) bioleaching technique is grasped and is controlled more complicated, needs certain study and training, and wants the practical work experience of long period just can better red-tape operati.
Along with scientific-technical progress, the technology such as chemical oxidation have been applied to the dewatering improving mud.Fenton reagent is Fe
2+and H
2o
2the strong oxidizing solution of composition, can be organic in rapid reaction oxidized sludge, destroy microorganisms cell and Extracellular polymers, release cells internal water and Extracellular polymers surface-bonded water, the efficient dehydration property improving just heavy mud.
If application number is 201210449383.1, name is called a kind of method that mud co-conditioning dewaters, application publication number is CN102910793A, then Fenton reagent is utilized to be oxidized and tensio-active agent (cetyl trimethylammonium bromide by the direct acidification sludge of mineral acid (pH=5), CTMAB) sludge conditioning is carried out, add cationic polyacrylamide (CPAM) flocculation treatment, then centrifugal dewatering of sludge, obtain the dewatered sludge of water ratio 78.2%.But this method dehydrating effect is general, and sludge reduction is also not obvious, and use pharmacy variety quantity more, production cost is higher.
Give a kind of method flow diagram utilizing bioleaching mud co-conditioning to carry out sludge dewatering of the embodiment of the present invention see Fig. 3, comprising:
Step 11, adds the drop leaching biological sludge reacted to primary sludge, the biological acidification utilizing described drop to soak biological sludge on the surface negative charge of described primary sludge particle.
Wherein, the volume ratio that described primary sludge and described drop soak biological sludge is (0.5:1)-(1:1), and the water ratio of described primary sludge is 93%-97%.
Step 12, the pH value adjusting the primary sludge mixed solution obtained is 3-4.
Specifically, pH can be measured by online pH meter, and adopt technical grade sulfuric acid to adjust pH.Specifically, the pH value of described adjustment primary sludge mixed solution is that 3-4 comprises:
Sub-step 121, utilizes online pH meter to measure to add the pH value of mixing sludge after described drop leaching biological sludge.
Sub-step 122, adds technical grade sulfuric acid in described mixing sludge, and stir 3-5 minute, adjust ph is between 3-4, and the mass concentration of described technical grade sulfuric acid is 93%-98%.
Step 13, ferrous sulfate crystal is added in described primary sludge, after stirring and dissolving, add superoxide, described ferrous sulfate crystal ferrous ions and described superoxide are combined to form the hydroxyl radical free radical of tool strong oxidation in acid condition, utilize its oxidative damage to peel off microorganism cells and Extracellular polymers in described primary sludge, discharge described microorganism cells internal water and described Extracellular polymers surface-bonded water.
Wherein, the mass concentration of described ferrous sulfate crystal is 85%-90%, the mass ratio of the oven-dry weight of described ferrous sulfate crystal and described primary sludge is 5%-10%, the mass concentration of described superoxide is 27.5%-30%, the mass ratio of the oven-dry weight of described superoxide and described primary sludge and 8%-10%.
In the embodiment of the present invention, described ferrous sulfate crystal can be ferrous sulfate FeSO
47H
2o also can be Feromax FeSO
4h
2o.
In the embodiment of the present invention, preferably, described superoxide can be oxydol H
2o
2or SPC-D 2Na
2cO
33H
2o
2(being commonly called as Solid hydrogen peroxide).
This patent chemical agent used such as ferrous sulfate crystal and superoxide etc. can replace with other chemical agent of similar action.
In the embodiment of the present invention, preferably, when stirring, adopt mechanical stirring or pressurized air to stir, any whipped form namely reaching the well-mixed object of material can replace.
The foreign odor taste of this step mud in dehydration is eliminated, and the harmful levels of pathogens such as intestinal bacteria are significantly killed, and reach primary sludge dehydration property and nurse one's health the object with effective sterilization fast.
Step 14, carries out solid-liquid separation dehydration process by autoclave diaphragm plate-and-frame filter press to described primary sludge, obtains the dewatered sludge that water ratio is less than 55%.
By aforesaid method by the most surfaces planar water release in mud, the efficient dehydration property improving just heavy mud.Eventually pass the semi-oriented mud that barrier film plate-and-frame filter press processed obtains water ratio less than 55%, than conventional sludge treatment decrement 1/2-2/3, for follow-up recycling and disposal provide better condition.
In the embodiment of the present invention, preferably, pH value≤4 of described drop leaching biological sludge.
In the embodiment of the present invention, preferably, the time of stirring after adding described ferrous sulfate crystal is 5-10 minute, and the time of stirring after adding described superoxide is 15-30 minute, 0.5-1 hour consuming time altogether in the whole process of the method, can fast processing primary sludge, needed for conditioner, volume is less, greatly saves and takes up an area and initial cost, process of simultaneously nursing one's health does not need long-time aeration, just short period of time conventional mechanical or pressurized air stir, and significantly save and run power consumption, production cost is lower.
In the embodiment of the present invention, preferably, can also execution above-mentioned steps after, after namely the mud of this batch of co-conditioning all enters into autoclave diaphragm plate-and-frame filter press, carry out the first heavy mud conditioning of next batch according to the timed interval of presetting, realize sequence batch (circular treatment.And arbitrary time span can be taked according between the condition of production two batches, technology controlling and process is simple, easily grasps operation.
In sum, the embodiment of the present invention can significantly improve the dehydration property of primary sludge, fast processing primary sludge, and reduce running cost, and realize effective sterilization and the minimizing of primary sludge, technique is simple to operation.
The present invention is understood better in order to make those skilled in the art, be described by the concrete method utilizing bioleaching mud co-conditioning to carry out sludge dewatering of example to the embodiment of the present invention, Fig. 4 shows in an example of the embodiment of the present invention and utilizes bioleaching mud co-conditioning to carry out the method schematic diagram of sludge dewatering, can comprise:
A. excess sludge (water ratio 98%) adds sludge bioleaching pond, drop leaching biological sludge pH≤4 of having reacted;
B. in first heavy mud co-conditioning pond, primary sludge (water ratio 93%-97%) is soaked biological sludge with drop to mix, carry out mechanical stirring, adding a small amount of mineral acid control pH is 3-4, adds FeSO
47H
2o and H
2o
2, the residence time is 0.5-1 hour altogether;
C. carry out mechanical dehydration with barrier film plate-and-frame filter press after sludge modification, obtain the dewatered sludge of high mass dryness fraction, water ratio is less than 55%, odorless, can carry out the utilization of resources further.
More specifically, can comprise the following steps:
1) primary sludge adds the drop leaching biological sludge conditioning of having reacted: get municipal sewage plant primary sludge, water ratio 93%-97%, volume ratio in drop leaching biological sludge and primary sludge: the ratio of 0.5:1-1:1 mixes simultaneously and adds the drop reacted and soak biological sludge (pH≤4), the biological acidification utilizing the drop that react to soak mud on mud granule surface negative charge, regulate the pH value of just heavy mud mixed solution, utilize online pH meter to measure the pH value of mixed solution.
2) adjustment of primary sludge pH of mixed controls: according to the value of the online pH meter of mixed solution, in the volume ratio of mass concentration 93%-98% technical grade sulfuric acid with first heavy mud: the ratio of 0.001:1-0.003:1 adds a small amount of technical grade sulfuric acid, stir 3-5 minute, adjust ph is between 3-4.
3) primary sludge chemical conditioning: by the FeSO of mass concentration 85%-90% in the first heavy mud mixed solution regulating pH value
47H
2o adds FeSO with the ratio of the mass ratio 5%-10% of first heavy mud oven-dry weight
47H
2o, stirs 5-10 minute, by the H of concentration 27.5%-30% after to be dissolved
2o
2h is added with the ratio of the mass ratio 8%-10% of first heavy mud oven-dry weight
2o
2, stir 15-30 minute.Ferrous ion and hydrogen peroxide is utilized to be combined to form the hydroxyl radical free radical (OH) of tool strong oxidation in acid condition, can be organic in rapid reaction oxidized sludge, destroy microorganisms cell and Extracellular polymers, release cells internal water and Extracellular polymers surface-bonded water, the dehydration property of the first heavy mud of efficient improvement, in simultaneous reactions process, the foreign odor taste of mud is eliminated, and the harmful levels of pathogens such as intestinal bacteria are significantly killed, and reach primary sludge dehydration property and nurse one's health the object with effective sterilization fast.
4) mechanical dehydration: by autoclave diaphragm plate-and-frame filter press, solid-liquid separation dehydration process is carried out for the first heavy mud mixed solution after co-conditioning, pressing filtering liquid is back to Sewage Plant leading portion and sewage combination treatment, the dewatered sludge of output is as good as stink, water ratio is less than 55%, than conventional sludge treatment decrement 1/2-2/3, for follow-up recycling and disposal provide better condition.Whole conditioning process time is 0.5-1 hour, and needed for conditioner, volume is less, greatly saves and takes up an area and initial cost, and process of simultaneously nursing one's health does not need long-time aeration, and just short period of time conventional mechanical stirs, and significantly save and run power consumption, production cost is lower.
5) after the mud of this batch of co-conditioning all enters into autoclave diaphragm plate-and-frame filter press, the first heavy mud conditioning of next batch can be carried out, sequence batch (circular treatment, and arbitrary time span can be taked according between the condition of production two batches, technology controlling and process is simple, easily grasps operation.
Below by way of the effect of a detailed programs application note embodiment of the present invention.
Wuxi sludge of sewage treatment plant mummification dehydration project
In existing bioleaching process sludge drying engineering according to Fig. 4 shown in the design done of technical process and construction, adopt the inventive method to need to do some improvement to existing utility as follows:
1) former drop soaking technology 2 depot reactions are completed the settling tank of bioleaching mud wherein 1 be transformed into just heavy mud co-conditioning pond, concrete grammar is at former settling tank (volume 400m
3) upper installation 9 rated output 3KW, the machine mixer of rotating speed 60r/min.
2) by the first heavy mud co-conditioning pond of Sewage Plant originally heavy mud discharge line access transformation.
3) between dosing, FeSO is increased
47H
2o and H
2o
2and the throwing device of sulfuric acid.
4) former 4 groups of biological leaching basins run simultaneously, change operation 2 groups into.
Apply method of the present invention and data that bioleaching drying technique of the prior art carries out sludge treatment compare:
To process 200,000 tons of sewage to day, it is example that the dewatered sludge of 200 ton per day 80% water ratio that conversion produces carries out co-conditioning drying and other treatment, and result is as shown in the table.
For embodiment of the method, in order to simple description, therefore it is all expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not by the restriction of described sequence of operation, because according to the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in specification sheets all belongs to preferred embodiment, and involved action and parts might not be that the present invention is necessary.
Above a kind of method utilizing bioleaching mud co-conditioning to carry out sludge dewatering provided by the present invention is described in detail, apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (8)
1. utilize bioleaching mud co-conditioning to carry out a method for sludge dewatering, it is characterized in that, comprising:
The drop leaching biological sludge reacted is added to primary sludge, the biological acidification utilizing described drop to soak biological sludge on the surface negative charge of described primary sludge particle, the volume ratio that described primary sludge and described drop soak biological sludge is (0.5:1)-(1:1), and the water ratio of described primary sludge is 93%-97%;
The pH value adjusting the primary sludge mixed solution obtained is 3-4;
Ferrous sulfate crystal is added in described primary sludge, after stirring and dissolving, add superoxide, described ferrous sulfate crystal ferrous ions and described superoxide are combined to form the hydroxyl radical free radical of tool strong oxidation in acid condition, utilize its strong oxidizing property to destroy and peel off microorganism cells and Extracellular polymers in described primary sludge, discharge described microorganism cells internal water and described Extracellular polymers surface-bonded water, the mass concentration of described ferrous sulfate crystal is 85%-90%, the mass ratio of the oven-dry weight of described ferrous sulfate crystal and described primary sludge is 5%-10%, the mass concentration of described superoxide is 27.5%-30%, the mass ratio of the oven-dry weight of described superoxide and described primary sludge and 8%-10%,
By autoclave diaphragm plate-and-frame filter press, solid-liquid separation dehydration process is carried out to described primary sludge mixed solution, obtain the dewatered sludge that water ratio is less than 55%.
2. method according to claim 1, is characterized in that,
Described ferrous sulfate crystal is ferrous sulfate or Feromax.
3. method according to claim 1, is characterized in that, described superoxide is hydrogen peroxide or SPC-D.
4. method according to claim 1, is characterized in that, pH value≤4 of described drop leaching biological sludge.
5. method according to claim 1, is characterized in that, the time of stirring after adding described ferrous sulfate crystal is 5-10 minute, and the time of stirring after adding described superoxide is 15-30 minute, and described method is 0.5-1 hour consuming time altogether.
6. method according to claim 1, is characterized in that, the pH value of described adjustment primary sludge is that 3-4 comprises:
Utilize online pH meter to measure to add the pH value of mixing sludge after described drop leaching biological sludge;
In described mixing sludge, add technical grade sulfuric acid, stir 3-5 minute, adjust ph is between 3-4, and described technical grade h 2 so 4 concentration is 93%-98%.
7. method according to claim 1, is characterized in that, when stirring, adopts mechanical stirring or pressurized air to stir.
8. method according to claim 1, is characterized in that, also comprises:
The first heavy mud conditioning of next batch is carried out, to realize sequence batch (circular treatment according to the timed interval of presetting.
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| CN110563291A (en) * | 2019-09-09 | 2019-12-13 | 湖南鑫恒环境科技有限公司 | Comprehensive harmless treatment method of sludge and application of treated sludge |
| CN111635113A (en) * | 2020-04-27 | 2020-09-08 | 同济大学 | Method for dewatering and conditioning sludge by using calcium peroxide |
| CN117023944A (en) * | 2023-10-08 | 2023-11-10 | 杭州尚善若水环保科技有限公司 | Sludge mixing dehydration method in LCD manufacturing industry |
| CN117023944B (en) * | 2023-10-08 | 2024-01-23 | 杭州尚善若水环保科技有限公司 | Sludge mixing dehydration method in LCD manufacturing industry |
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