CN115745334A - Sludge deodorization conditioner and sludge deodorization stabilization treatment method - Google Patents
Sludge deodorization conditioner and sludge deodorization stabilization treatment method Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 249
- 238000004332 deodorization Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000006641 stabilisation Effects 0.000 title claims abstract description 7
- 238000011105 stabilization Methods 0.000 title claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 107
- 230000003750 conditioning effect Effects 0.000 claims abstract description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
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Abstract
The invention discloses a sludge deodorization conditioner and a treatment method for sludge deodorization stabilization, and relates to the field of municipal sludge treatment. The sludge deodorization conditioner comprises: the composition comprises a first conditioning agent and a second conditioning agent, wherein the first conditioning agent comprises a cross-linking agent and a charge neutralizing agent, and the second conditioning agent comprises an oxidizing agent and a framework building agent. The conditioner provided by the invention can efficiently neutralize the potential of sludge colloid, compress colloid double electric layers, reduce Zeta potential, break the molecular structure of substances emitting malodor in sludge and fundamentally eliminate the generation source of the malodor substances. The conditioner can destroy zoogloea and microbial cell walls in sludge, release bound water in the sludge, construct a permeable skeleton and a water conservancy channel, greatly improve the dehydration performance of the sludge, and ensure that a mud cake after dehydration does not release foul smell and rebound. The sludge deodorization process provided by the invention is simple, the conditioning parameters can be automatically controlled by a computer, and the industrial and large-scale production is easy to realize.
Description
Technical Field
The invention relates to the field of municipal sludge treatment, in particular to a sludge deodorization conditioner and a sludge deodorization stabilization treatment method.
Background
With the rapid development of cities, the sewage treatment capacity is increased rapidly, and the problem of harmless treatment of sludge serving as an important byproduct of sewage treatment is an important bottleneck for restricting the benign development of sewage treatment plants. The most important link is to dewater sludge firstly on the premise of resource utilization of sludge composting, incineration, brick making, pottery making and the like. However, since the sludge is an extremely complex heterogeneous body composed of bacterial cells, organic debris, inorganic particles, colloids, and the like, has an extremely high water content (up to 99% or more), a high organic content, is easily decomposed and smelly, and has fine particles, a small specific gravity, and a colloidal liquid state, it is difficult to perform solid-liquid separation by conventional sedimentation.
At present, sludge dewatering processes commonly adopted for sludge dewatering in sewage plants in various big cities are as follows: (1) Cationic Polyacrylamide (CPAM) is combined with a centrifugal dehydration process, but the dehydration efficiency is not high, the water content of the dehydrated sludge is still about 80%, the sludge is still viscous and fluid, and is extremely easy to decay and stink, the environmental sanitation is poor, and the physical and mental health and the subsequent resource utilization of workers are seriously influenced. (2) The process improves the sludge dewatering efficiency to a certain extent, the water content of a mud cake can be reduced to below 50% under the optimal condition, but organic matters which are easily degraded by microorganisms cannot be eliminated, the treated sludge is still black and stink, resource utilization such as brick making and the like is difficult to carry out, and the sludge is difficult to burn due to the addition of a large amount of lime and only can be buried, so that the sludge resource is greatly wasted. (3) A centrifugal dehydration and low-temperature drying process is characterized in that coal gangue, lime and the like are added into sludge (with the water content of 80%) subjected to centrifugal dehydration for conditioning, the water content of the sludge is adjusted to 72%, then a sludge slitter is used for slitting and low-temperature drying is carried out, although the water content of the sludge subjected to drying can reach about 40%, the process has the problem of malodor in the production process, the production energy consumption is high, and the environmental sanitation problem and the production cost performance are low, so that the process is difficult to popularize.
Moreover, many sludge conditioners have many components at present, the preparation process is too complex, and the pH value of the sludge needs to be adjusted to be neutral or acidic before use, so that the production cost and the popularization and application difficulty of the conditioners are increased.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a sludge deodorization conditioner which can fully release sludge bound water and eliminate microorganism easily-degradable odorous organic matters in sludge, thereby greatly improving the dehydration performance and compressibility of the sludge, eliminating the stinking smell of the sludge, stabilizing the sludge after dehydration, avoiding the release of the stinking smell and pathogens after long-term stacking, and paving a road for the smooth resource utilization of the subsequent sludge. In addition, the method for deodorizing the sludge is provided, the process flow is greatly simplified, the dehydration efficiency is high, and the pH value of the sludge does not need to be independently adjusted.
The invention is realized by the following steps:
in a first aspect, the present invention provides a sludge deodorization conditioner comprising: the sludge treatment system comprises a first conditioning agent and a second conditioning agent, wherein the first conditioning agent comprises a cross-linking agent and a charge neutralizing agent for neutralizing the surface charge of the sludge, and the second conditioning agent comprises an oxidizing agent and a skeleton building agent.
The electric potential of the sludge colloid is neutralized by the charge neutralizer in the first conditioner, and the double electric layers of the sludge colloid are compressed, so that the Zeta potential of the sludge colloid is reduced, and the sludge colloid particles are aggregated. And the destabilized sludge particles are caught and agglomerated by the functional structure of the cross-linking agent. Meanwhile, the first conditioner can improve the osmotic pressure of sludge microorganism cells, so that the microorganisms die and the cells are broken and dehydrated. In addition, the first conditioning agent acts to activate the oxidizing agent.
The oxidant in the second conditioner can destroy molecular structures such as protein, ammonia, organic amine, methyl mercaptan, skatole and the like in the sludge through chemical action 'cutting', for example, the molecular structures and cell walls of zoogloea can be destroyed, and the molecular structures and functional groups of the protein which is easy to generate substances such as hydrogen sulfide, ammonia, methyl mercaptan and the like are subjected to chain scission and conversion, so that the generation source of the sludge malodorous substances is eliminated, and the sludge does not emit malodorous substances any more. Meanwhile, the oxidant in the second conditioner further destroys the biodegradable components (soluble organic carbon (DOC), soluble protein, amino acid and the like) in the sludge under the activation action of the first conditioner, and the biochemical stability of the sludge is improved. In addition, under the synergistic effect of the first conditioner and the second conditioner, crystal particles can be generated, and a network framework (namely a dehydration framework) and a water conservancy channel which are easy to permeate water are constructed, so that the dehydration performance of the conditioned sludge is improved. Through the conditioning, the conditioned sludge is stabilized, the dehydration performance is greatly improved, the dehydrated sludge cake does not release foul smell and rebound, and the subsequent resource utilization (incineration, brick making, pottery making and the like) of the sludge is ensured to be smoothly implemented.
By taking the specific resistance of Sludge (SRF) and the water content of a mud cake as evaluation indexes, after the sludge deodorization conditioner provided by the invention is conditioned and dehydrated, compared with the sludge deodorization conditioner before conditioning, the optimal sludge deodorization conditioner can reduce the specific resistance of the sludge by 85-92% and reduce the water content of the mud cake to 30-58%.
In a preferred embodiment of the present invention, the cross-linking agent is at least one selected from the group consisting of sodium carboxymethylcellulose (CMC-Na), synthetic organic flocculants, and inorganic flocculants.
The cross-linking agent has higher adsorption activity, can adsorb fine particles in sludge to form larger flocs, and simultaneously forms a water channel with the framework construction agent to achieve the purpose of improving the sludge dewatering performance. The water conservancy channel refers to a cross-linking agent for adsorbing particles in the sludge to form larger flocs, and after the larger flocs are grafted or contacted with the framework construction agent, larger gaps can be reserved so that water can freely shuttle, and therefore higher dehydration efficiency is achieved. If larger flocs are not formed, the sludge has finer particles and smaller specific gravity, and the solid-liquid separation is difficult to realize quickly and efficiently.
The skeleton building agent has a microporous structure, and in addition, compared with sludge particles, the skeleton building agent has the performance of higher hardness after being combined with a cross-linking agent and flocs, is not easy to collapse, and is favorable for forming a stable water conservancy channel, thereby achieving higher dehydration efficiency.
In an alternative embodiment, the synthetic organic flocculant is selected from polyacrylamide or sodium polyacrylate and the inorganic flocculant is selected from FeCl 3 、Fe 2 (SO 4 ) 3 、AlCl 3 And Al 2 (SO 4 ) 3 At least one of (1).
In an alternative embodiment, the synthetic organic flocculant is selected from cationic polyacrylamide and the inorganic flocculant is selected from AlCl 3 And Al 2 (SO 4 ) 3 。
In a preferred embodiment of the present invention, the charge neutralizer is a negative charge neutralizer.
In an alternative embodiment, the negative charge neutralizer is selected from the group consisting of NaCl, naOH, CH 3 COONa、MgCl 2 、MgSO 4 、CaCl 2 、Ca(NO 3 ) 2 、FeCl 2 、FeSO 4 At least one of quaternary ammonium salts and quaternary ammonium bases.
In an alternative embodiment, the negative charge neutralizer is selected from FeSO 4 And FeCl 2 At least one of (a).
In a preferred embodiment of the present invention, the oxidizing agent is at least one selected from the group consisting of perbromates, perchlorates, periodates, persulfates, permanganates, ferric nitrate, calcium peroxide, hydrogen peroxide, sodium dichloroisocyanurate, sodium ferrate, nitrite compounds, perborate compounds, hypochlorite compounds, chlorite compounds, and percarbamides.
In an alternative embodiment, the oxidizing agent is selected from KMnO 4 、KClO 3 、NaClO 2 、Ca(ClO 2 ) 2 、CaO 2 、H 2 O 2 At least one of percarbamide, sodium persulfate, potassium hydrogen persulfate, sodium dichloroisocyanurate and sodium ferrate;
in an alternative embodiment, the oxidizing agent is selected from at least one of sodium persulfate, potassium persulfate, dichloroisocyanuric acid, and calcium hypochlorite.
Taking ferrous salt and sodium salt in the first conditioner and hypochlorite in the second conditioner as examples, the action process is as follows:
2Fe 2+ +ClO - +4OH - +H 2 O＝2Fe(OH) 3 ↓+Cl -
hypochlorite ion inReacting Fe with alkaline environment 2+ Is oxidized into Fe 3+ Then with OH in alkali - Combined into Fe (OH) 3 Precipitation of Fe (OH) in solution 3 The colloid can aggregate particles in the sludge to form sediment for removal. Meanwhile, hypochlorite ions can penetrate cell walls and cell membranes of microorganisms to destroy molecular structures of proteins, nucleic acids and the like of the microorganisms, so that the microorganisms are killed finally, and the purpose of stabilizing the sludge is achieved.
Meanwhile, under the alkaline environment, hypochlorite ions can continuously oxidize ferric hydroxide into ferrate ions.
3NaClO+10NaOH+2FeCl 3 ＝2Na 2 FeO 4 +6NaCl+5H 2 O
The iron in the ferrate ion has the highest valence state +6, has very strong oxidizability, can oxidize most organic matters and has selectivity. The reaction equation of ferrate in alkaline solution, weak alkaline, neutral, slightly acidic and acidic solution environments is as follows:
under a neutral environment: feO 4 2- +4H 2 O+3e-＝Fe(OH) 3 +5H 2 O
Under an alkaline environment: feO 4 2- +4OH - +3e-＝Fe(OH) 3 +OH -
Under an acid environment: feO 4 2- +8H + +3e-＝Fe 3+ +4H 2 O
The mechanism of the ferrate ions for breaking chains of macromolecules such as protein, fat, amino acid and the like in the sludge and improving the dehydration performance is mainly through the strong oxidizing property, the coagulation aiding effect of hydrolysis products and the final product Fe (OH) 3 The synergistic effect of the three components with higher adsorption activity is achieved. The strong oxidizing property can destroy the organic protective layer on the colloid surface to make it easy to destabilize, and the high-valence positive charge hydrolysate thereof destabilizes the inorganic colloid in the water by electric neutralization, finally generating Fe (OH) 3 Can adsorb flocs and smaller particles in water to form larger flocs, and simultaneously forms a water channel with the framework construction agent to achieve the purpose of improving the sludge dewatering performance.
In an alternative embodiment, ferrate is not directly added as the oxidant, which is because ferrate itself is easily deactivated and has high production cost, and the use of oxidant such as hypochlorite to oxidize ferrous salt to produce ferrate has the advantages of low production cost and being produced in situ.
In a preferred embodiment of the present invention, the skeleton-forming agent is at least one selected from the group consisting of diatomaceous earth powder, fly ash, pulverized coal, gangue powder, blast furnace dust, and zeolite powder.
In the preferred embodiment of the invention, the first conditioning agent is a mixture of a medium crosslinking agent and a charge neutralizing agent, and the mixing mass ratio of the crosslinking agent to the charge neutralizing agent in the first conditioning agent is (0.1-5): 1.
The sludge dewatering efficiency is good and the fishy smell removing effect is good under the mixing mass ratio. For example, the mixing mass ratio is (0.1-1): 1, or (1-5): 1, or (0.2-2): 1.
In an optional embodiment, the second conditioner is a mixture of an oxidant and a skeleton-forming agent, and the mixing mass ratio of the oxidant to the skeleton-forming agent in the second conditioner is 1: (0.01-10). For example, the mixing mass ratio is 1: (0.01-5), or 1: (0.01-0.05).
For example, the first conditioner and the second conditioner in the sludge deodorization conditioner are separately packaged and are separately added when in use.
In a second aspect, the present invention also provides a treatment method for sludge deodorization and stabilization by using a sludge deodorization conditioner, which comprises the following steps: firstly, fully stirring and mixing the sludge to be treated with a first conditioner, and then adding a second conditioner for fully stirring and mixing.
The sludge deodorization conditioner is used for conditioning the sludge, can be directly used without adjusting the pH value of the sludge in advance, simplifies the sludge conditioning flow, saves a large amount of cost, improves the sludge treatment efficiency, and has good economic benefit for sludge treatment.
The conditioning process provided by the invention is simple and efficient, the conditioning program can realize automatic control of a computer, and the industrial and large-scale production is easy to realize.
In other embodiments, the conditioned sludge is pumped into a high pressure belt press or a plate and frame filter press to achieve deep dehydration and stabilization of the sludge.
In the embodiment of the invention with better application, the first conditioner is mixed with the sludge to be treated, and then the second conditioner is added to be fully stirred and mixed. Such conditioning step can significantly improve the dewatering properties of the conditioned sludge; if the conditioning sequence is changed, the second conditioning agent can lead the sludge particles to be more finely divided, and the first conditioning agent is difficult to form dense and larger flocs, so that the dehydration performance of the conditioned sludge is obviously reduced.
In an optional embodiment, the addition amount of the first conditioning agent accounts for 0.1-50% of the mass of the sludge to be treated; for example, 0.1% -10%, or 1% -50%, or 20% -50%.
In an alternative embodiment, the first conditioning agent is added in an amount of 1% to 8% by mass of the sludge to be treated.
In an optional embodiment, the addition amount of the second conditioner accounts for 0.1-50% of the mass of the sludge to be treated; for example, 0.1% -10%, or 1% -50%, or 20% -50%.
In an alternative embodiment, the second conditioner is added in an amount of 4% to 22% by mass of the sludge to be treated.
The first conditioner is matched with the second conditioner under the addition amount, and the deodorization device has good deodorization effect and dehydration efficiency.
In the preferred embodiment of the invention, the first conditioner is mixed with the sludge to be treated, and then stirred for 5-60min at the stirring speed of 50-500 r/min;
in an alternative embodiment, the second conditioner is added and then stirred for 5-60min at a stirring speed of 30-200 rpm.
In the embodiment of the invention, the sludge to be treated is municipal concentrated sludge with the water content of 95-99% or municipal dewatered sludge with the water content of about 80%.
The invention has the following beneficial effects:
according to the invention, the electric potential of the sludge colloid is neutralized by the charge neutralizer in the first conditioner, and the double electric layers of the sludge colloid are compressed, so that the Zeta potential of the sludge colloid is reduced, and further, the sludge colloid particles are aggregated. And the destabilized sludge particles are caught and agglomerated by the functional structure of the cross-linking agent. Meanwhile, the first conditioner can improve the osmotic pressure of sludge microbial cells, so that the microorganisms die, and the cells are broken and dehydrated. In addition, the first conditioning agent acts to activate the oxidizing agent.
The oxidant in the second conditioner can destroy molecular structures such as protein, ammonia, organic amine, methyl mercaptan, skatole and the like in the sludge through chemical action 'cutting', for example, the molecular structures and cell walls of zoogloea can be destroyed, and the molecular structures and functional groups of the protein which is easy to generate substances such as hydrogen sulfide, ammonia, methyl mercaptan and the like are subjected to chain scission and conversion, so that the generation source of the sludge malodorous substances is eliminated, and the sludge does not emit malodorous substances any more. Meanwhile, the oxidant in the second conditioner further destroys the biodegradable components (soluble organic carbon (DOC), soluble protein, amino acid and the like) in the sludge under the activation action of the first conditioner, and the biochemical stability of the sludge is improved.
In addition, crystal particles can be generated under the synergistic action of the first conditioning agent and the second conditioning agent, and a network framework (namely a dehydration framework) and a water conservancy channel which are easy to permeate water are constructed, so that the dehydration performance of the conditioned sludge is improved. Through the conditioning, the conditioned sludge is stabilized, the dehydration performance is greatly improved, the dehydrated sludge cake does not release foul smell and rebound, and the subsequent resource utilization (incineration, brick making, pottery making and the like) of the sludge is ensured to be smoothly implemented.
The sludge deodorization conditioner provided by the invention is used for conditioning sludge, can be directly used without adjusting the pH value of the sludge in advance, simplifies the sludge conditioning flow, saves a large amount of cost, improves the sludge treatment efficiency, and has excellent economic benefit for sludge treatment. The conditioning process provided by the invention is simple and efficient, the conditioning program can realize automatic control of a computer, and the industrial and large-scale production is easy to realize.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
FIG. 1 is a schematic diagram showing the effect of neutralizing and aggregating colloidal particles of sludge electrically after a first conditioner is added;
FIG. 2 is a schematic diagram showing the effect of the second conditioner of the present invention on the cell wall of the zoogloea being broken and the bound water being released;
FIG. 3 is a sample graph of sludge cake conditioned by the conditioning process of example 1;
FIG. 4 is a sample graph of sludge cake conditioned by the conditioning process of example 2;
FIG. 5 is a sample plot of sludge cakes conditioned by the conditioning process of example 3;
FIG. 6 is a sample graph of sludge cake conditioned by the conditioning process of example 4;
FIG. 7 is a sample graph of sludge cake conditioned by the conditioning process of example 5;
FIG. 8 is a sample plot of sludge cake conditioned by the conditioning process of example 6;
FIG. 9 is a sample plot of sludge cake conditioned by the conditioning process of example 7;
FIG. 10 is a sample plot of sludge cakes conditioned by the conditioning process of example 8.
Detailed Description
Reference will now be made in detail to embodiments of the invention, one or more examples of which are described below. Each example is provided by way of explanation, not limitation, of the invention. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment, can be used on another embodiment to yield a still further embodiment.
The technical principle of the sludge deodorization conditioner is shown in fig. 1 and fig. 2, fig. 1 is a schematic diagram of the effect of neutralizing and aggregating sludge colloid particles after the addition of the first conditioner, a double electric layer of the colloid particles with negative charges in the sludge is neutralized and compressed by the first conditioner, and meanwhile, the sludge particles after destabilization are caught and aggregated by a functional structure of the first conditioner; FIG. 2 is a schematic diagram showing the effect of breaking cell walls of zoogloea in sludge and releasing bound water after the second conditioner is added. The functional groups of the second conditioner destroy the zoogloea structure and the cell wall under the excitation of the first conditioner, and break chains and convert the protein molecular structure and the functional groups of substances such as hydrogen sulfide, ammonia, methyl mercaptan and the like, so that a generation source of sludge malodorous substances is eliminated, and simultaneously, the first conditioner and the second conditioner react to generate water-insoluble crystal particles, so that a sludge dewatering framework and a water conservancy channel are constructed, and the dewatering performance of sludge is greatly improved. By taking the specific resistance of the Sludge (SRF) and the water content of the mud cake as evaluation indexes, after the sludge is conditioned and dehydrated by the sludge deodorization conditioner, compared with the sludge before conditioning, the specific resistance of the sludge is reduced by 85-92%, and the water content of the mud cake is reduced to 30-58%.
The sludge specific resistance is as follows: resistance per unit mass of sludge per unit area of filtration when filtered under a certain pressure.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The features and properties of the present invention are described in further detail below with reference to examples.
In the following examples and comparative examples, the agent A is the first conditioner, the agent B is the second conditioner, and the municipal sludge deodorization and deodorization stabilizing AB conditioner is the sludge deodorization conditioner.
Example 1
A stabilized AB conditioner for removing fishy smell and odor of municipal sludge is prepared from NaCl and FeSO 4 Mixed with CPAM, the agent B is persulfuric acidHydrogen potassium, caO 2 Mixing with diatomite powder. NaCl and FeSO in the agent A 4 And CPAM at a weight ratio of 1; potassium hydrogen persulfate and CaO in the agent B 2 And the weight ratio of the diatomite powder is 4.
The sludge of the concentration tank of the municipal sewage treatment plant in Lanzhou city is measured, the water content of the sludge is 97.3 percent, the pH value is 7.8, and the sludge is black and smelly. The conditioning process comprises the following steps:
(1) Adding an agent A into the sludge, wherein the adding amount of the agent A is 0.4 percent of the dry weight of the sludge, and fully mixing and stirring the mixture for 25min at the rotating speed of 300 r/min;
(2) Then adding agent B, wherein the adding amount of the agent B is 0.4 percent of the dry basis weight of the sludge, and fully mixing and stirring for 20min at the rotating speed of 150 r/min.
Through determination, the specific resistance of the conditioned sludge is reduced by 88.3 percent, and after a conditioned sludge sample is subjected to vacuum filtration under 0.074Mpa, a mud cake is earthy yellow, has the water content of about 73 percent, has no stink and has normal soil smell; the mud cake sample does not rebound after being placed for 3 days, and does not generate any odor.
Example 2
A municipal sludge deodorization and deodorization stabilizing AB conditioner is prepared by FeSO 4 、AlCl 3 And CPAM, and the agent B is prepared by mixing MgO and Ca (ClO) 2 powder. FeSO in agent A 4 、AlCl 3 And CPAM at a weight ratio of 1; the weight ratio of MgO to Ca (ClO) 2 in the agent B is 1:1.
The sludge of the concentration tank of the municipal sewage treatment plant in Lanzhou city is measured, the water content of the sludge is 97.3 percent, the pH value is 7.8, and the sludge is black and smelly. The conditioning process comprises the following steps:
(1) Adding an agent A into the sludge, wherein the adding amount of the agent A is 11 percent of the dry basis weight of the sludge, and fully mixing and stirring for 10min at the rotating speed of 300 r/min;
(2) Then adding agent B, the adding amount of which is 37 percent of the dry basis weight of the sludge, and fully mixing and stirring for 10min at the rotating speed of 150 r/min.
Through determination, the specific resistance of the conditioned sludge is reduced by 82.6 percent, and after a conditioned sludge sample is subjected to vacuum filtration under 0.074Mpa, a mud cake is earthy yellow, has the water content of about 83.5 percent and has no stink; the mud cake sample does not rebound after being placed for 3 days, and no foul smell is generated.
Example 3
A municipal sludge deodorization and deodorization stabilizing AB conditioner is prepared by adding CH to an agent A 3 COONa、MgCl 2 、Fe 2 (SO 4 ) 3 The agent B is prepared by mixing CaO and Ca (ClO) 2 powder. In agent A CH 3 COONa、MgCl 2 、Fe 2 (SO4) 3 The weight ratio of (1); the weight ratio of CaO to Ca (ClO) 2 in the agent B is 1:2.
The sludge of the concentration tank of the municipal sewage treatment plant in Lanzhou city is measured, the water content of the sludge is 97.3 percent, the pH value is 7.8, and the sludge is black and smelly. The conditioning process comprises the following steps:
(1) Adding an agent A into the sludge, wherein the adding amount of the agent A is 3.6 percent of the dry basis weight of the sludge, and fully mixing and stirring for 15min at the rotating speed of 200 r/min;
(2) Then adding agent B, the adding amount of which is 22 percent of the dry basis weight of the sludge, and fully mixing and stirring for 25min at the rotating speed of 150 r/min.
Through determination, the specific resistance of the conditioned sludge is reduced by 89.3 percent, and after a conditioned sludge sample is subjected to vacuum filtration under 0.074Mpa, a mud cake is earthy yellow, has the water content of about 78 percent and has no stink; the mud cake sample does not rebound after being placed for 3 days, and no foul smell is generated.
Example 4
A municipal sludge deodorization and deodorization stabilizing AB conditioner is prepared from CaCl 2 、MgCl 2 Mixing with CPAM powder, and mixing agent B with sodium ferrate and blast furnace ash powder. CaCl in the agent A 2 、MgCl 2 And CPAM in a weight ratio of 1; the weight ratio of the sodium ferrate in the agent B to the blast furnace ash powder is 1:1.
The sludge of the concentration tank of the municipal sewage treatment plant in Lanzhou city is measured, the water content of the sludge is 97.3 percent, the pH value is 7.8, and the sludge is black and smelly. The conditioning process comprises the following steps:
(1) Adding an agent A into the sludge, wherein the adding amount of the agent A is 8.4 percent of the dry basis weight of the sludge, and fully mixing and stirring for 12min at the rotating speed of 150 r/min;
(2) Then adding agent B, wherein the adding amount of the agent B is 12.6 percent of the dry basis weight of the sludge, and fully mixing and stirring for 20min at the rotating speed of 150 r/min.
Through determination, the specific resistance of the conditioned sludge is reduced by 85.6 percent, and after a conditioned sludge sample is subjected to vacuum filtration under 0.074Mpa, a mud cake is earthy yellow, has the water content of about 80 percent and has no stink; the mud cake sample does not rebound after being placed for 3 days, and no foul smell is generated.
Example 5
A municipal sludge deodorization and deodorization stabilizing AB conditioner is composed of FeCl 2 、Al 2 (SO 4 ) 3 The agent B consists of sodium dichloroisocyanurate and zeolite powder; feCl in A 2 、Al 2 (SO 4 ) 3 The weight ratio of the quaternary ammonium salt is 1; the weight ratio of the sodium dichloroisocyanurate to the zeolite powder in the agent B is 1:3.
The sludge of a concentration tank of a municipal sewage treatment plant in Lanzhou city is taken, and the water content of the sludge is 97.3 percent, the pH value of the sludge is 7.8, the sludge is black and has bad odor. The conditioning process comprises the following steps:
(1) Adding an agent A into the sludge, wherein the adding amount of the agent A is 11 percent of the dry basis weight of the sludge, and fully mixing and stirring for 40min at the rotating speed of 300 r/min;
(2) Then adding the agent B, wherein the adding amount of the agent B is 14.8 percent of the dry weight of the sludge, and fully mixing and stirring for 50min at the rotating speed of 200 r/min.
Through determination, the specific resistance of the conditioned sludge is reduced by 90.3 percent, and after a conditioned sludge sample is subjected to vacuum filtration under 0.074Mpa, a mud cake is earthy yellow, has the water content of about 78 percent and has no stink; the mud cake sample does not rebound after being placed for 3 days, and does not generate any odor.
Example 6
A stabilized AB conditioner for removing fishy smell and odor of municipal sludge is prepared from AlCl 3 CPAM powder, and agent B is Ca (ClO) 2 Blast furnace dust and CaO. AlCl in agent A 3 CPAM is 1, 0.01, ca (ClO) in the agent B 2 The weight ratio of the blast furnace ash to the CaO is 2.
The method comprises the steps of taking sludge in a concentration tank of municipal sewage treatment plants in Shandong cities, measuring the water content of the sludge to be 98.2 percent, measuring the pH value to be 7.8, and enabling the sludge to be black and smelly. The conditioning process comprises the following steps:
(1) Adding an agent A into the sludge, wherein the adding amount of the agent A is 1.07 percent of the dry basis weight of the sludge, and fully mixing and stirring for 15min at the rotating speed of 120 r/min;
(2) Then adding agent B, the adding amount of which is 14.3 percent of the dry basis weight of the sludge, and fully mixing and stirring for 10min at the rotating speed of 100 r/min.
Through determination, the specific resistance of the conditioned sludge is reduced by 89.6 percent, the conditioned sludge is pumped into a plate-and-frame filter press, and after being pressed and dehydrated under the pressure of 0.6MPa, a mud cake is brownish yellow, has no stink and normal mud smell, and has the water content of 45 percent; the mud cakes are not rebounded after being stacked for 3 days, and no foul smell is generated.
Example 7
A municipal sludge deodorization and deodorization stabilizing AB conditioner is composed of FeCl 2 、Al 2 (SO 4 ) 3 The agent B consists of dichloroisocyanuric acid, calcium hypochlorite, blast furnace ash and zeolite powder. FeCl in agent A 2 、Al 2 (SO 4 ) 3 The weight ratio of (A) to (B) is 2.
The sludge dewatered by a centrifuge in a municipal sewage treatment plant in Dalian city is measured, the water content of the sludge is 81.2 percent, the pH value is 6.9, and the sludge is black, plastic and fishy. The conditioning process comprises the following steps:
(1) Adding an agent A into the sludge, wherein the adding amount of the agent A is 2 percent of the dry weight of the sludge, and fully mixing and stirring the mixture for 40min at the rotating speed of 200 r/min;
(2) Then adding agent B, the adding amount of which is 4 percent of the dry basis weight of the sludge, and fully mixing and stirring for 50min at the rotating speed of 100 r/min.
The specific resistance of the conditioned sludge is reduced by 90.3 percent through measurement, the conditioned sludge is pumped into a plate-and-frame filter press, and after being pressed and dehydrated under the pressure of 0.8MPa, a mud cake is earthy yellow, has no stink and normal mud smell, and has the water content of about 60 percent; the mud cakes are not rebounded after being stacked for 3 days, and no foul smell is generated.
Example 8
A deodorizing and deodorizing stabilized AB conditioner for municipal sludge is prepared from FeSO 4 、AlCl 3 The agent B consists of sodium persulfate, potassium hydrogen persulfate and blast furnace ash powder. FeSO in A agent 4 、AlCl 3 The weight ratio of sodium persulfate to potassium hydrogen persulfate to blast furnace ash powder in the agent B is 2.
The sludge of the concentration tank of the municipal sewage treatment plant in Dalian city is measured, the water content of the sludge is 97.3%, the pH value is 7.1, and the sludge is black, sticky and fishy. The conditioning process comprises the following steps:
(1) Adding an agent A into the sludge, wherein the adding amount of the agent A is 8 percent of the dry weight of the sludge, and fully mixing and stirring the mixture for 30min at the rotating speed of 180 r/min;
(2) Then adding an agent B, wherein the adding amount of the agent B is 22 percent of the dry weight of the sludge, and fully mixing and stirring for 60min at the rotating speed of 100 r/min.
The specific resistance of the conditioned sludge is reduced by 92.1 percent through measurement, the conditioned sludge is pumped into a plate-and-frame filter press, and after being pressed and dehydrated under the pressure of 0.8MPa, a mud cake is earthy yellow, has no stink and normal mud smell, and has the water content of 58 percent; the mud cakes are not rebounded after being stacked for 3 days, and no foul smell is generated.
Example 9
A municipal sludge deodorization and deodorization stabilizing AB conditioner is prepared by FeSO 4 The B agent is composed of CaO 2 And coal gangue powder. FeSO in agent A 4 The weight ratio of the polyethyleneimine to the B agent is 1.01 2 And the proportion of the coal gangue powder is 4:1.
The sludge of the concentration tank of the municipal sewage treatment plant in Dalian city is measured, the water content of the sludge is 97.3%, the pH value is 7.1, and the sludge is black, sticky and fishy. The conditioning process comprises the following steps:
(1) Adding an agent A into the sludge, wherein the adding amount of the agent A is 8 percent of the dry basis weight of the sludge, and fully mixing and stirring the mixture for 30min at the rotating speed of 180 r/min;
(2) Then adding agent B, the adding amount of which is 22 percent of the dry basis weight of the sludge, and fully mixing and stirring for 60min at the rotating speed of 100 r/min.
Comparative example 1
In contrast to example 7, the agent A consists of FeCl 2 、Al 2 (SO 4 ) 3 The agent B only consists of blast furnace ash and zeolite powder, and the agent B does not contain dichloroisocyanuric acid and calcium hypochlorite. The sludge after conditioning has poor dehydration performance and unstable mud cake property and is easy to blacken and stink under the conditions of the same adding sequence and mixing and stirring time. Laboratory bench test results show that: adopting the formula of the conditioner in the comparative example 1, and the vacuum dehydration time of the sample is 20min; the mud cake turns black and smelly after being stored for 24 hours.
The laboratory bench test results for example 7 were (replicate 1): the vacuum dehydration time of the sample is 4min 30sec; the mud cake has no black and odorous phenomenon after being stored for 72 hours.
Comparative example 2
In contrast to example 7, the agent A consists of FeCl 2 、Al 2 (SO 4 ) 3 The agent B only consists of dichloroisocyanuric acid and calcium hypochlorite. The difference is that the agent B does not contain blast furnace dust and zeolite powder, the other raw materials are the same, and the preparation method is the same.
The sludge after conditioning has poor dehydration performance under the conditions of the same adding sequence and mixing and stirring time. Laboratory bench test results show that: the conditioner formulation of comparative example 2 was used and the sample vacuum dewatering time was 15min 35sec.
The laboratory bench test results for example 7 were (replicate 2): the vacuum dehydration time of the sample is 4min, 10sec; the mud cake has no black and odorous phenomenon after being stored for 72 hours.
Comparative example 3
Compared with example 7, the difference is only that the agent A does not contain Al 2 (SO 4 ) 3 The other raw materials are the same, and the preparation method is the same. The agent A is made of FeCl 2 The agent B consists of dichloroisocyanuric acid, calcium hypochlorite, blast furnace ash and zeolite powder. The sludge after conditioning has poor dewatering performance under the conditions of the same adding sequence and mixing and stirring time.
Laboratory bench test results show that: the conditioner formulation of comparative example 3 was used and the vacuum dewatering time for the samples was 9min 20sec. The laboratory bench results for example 7 were (replicate 3): the vacuum dehydration time of the sample is 4min 25sec; the mud cake has no black and odorous phenomenon after being stored for 72 hours.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A sludge deodorization conditioner, which is characterized by comprising: a first conditioning agent comprising a cross-linking agent and a charge neutralizing agent for neutralizing the surface charge of the sludge, and a second conditioning agent comprising an oxidizing agent and a framework building agent.
2. The sludge deodorization conditioner as claimed in claim 1, wherein the cross-linking agent is selected from at least one of sodium carboxymethylcellulose, artificially synthesized organic flocculants and inorganic flocculants;
preferably, the artificially synthesized organic flocculant is selected from polyacrylamide or sodium polyacrylate, and the inorganic flocculant is selected from FeCl 3 、Fe 2 (SO 4 ) 3 、AlCl 3 And Al 2 (SO 4 ) 3 At least one of (a);
preferably, the artificially synthesized organic flocculant is selected from cationic polyacrylamide, and the inorganic flocculant is selected from AlCl 3 And Al 2 (SO 4 ) 3 。
3. The sludge deodorizing conditioner of claim 1, wherein said charge neutralizer is a negative charge neutralizer;
preferably, the negative charge neutralizer is selected from NaCl, naOH, CH 3 COONa、MgCl 2 、MgSO 4 、CaCl 2 、Ca(NO 3 ) 2 、FeCl 2 、FeSO 4 At least one of quaternary ammonium salts and quaternary ammonium bases;
preferably, the negative charge neutralizer is selected from FeSO 4 And FeCl 2 At least one of (1).
4. The sludge deodorization conditioner as claimed in claim 1, wherein said oxidizing agent is selected from at least one of perbromate, perchlorate, periodate, persulfate, permanganate, ferric nitrate, calcium peroxide, hydrogen peroxide, sodium dichloroisocyanurate, sodium ferrate, nitrite compound, perborate compound, hypochlorite compound, chlorite compound, and percarbamide;
preferably, the oxidizing agent is selected from KMnO 4 、KClO 3 、NaClO 2 、Ca(ClO 2 ) 2 、CaO 2 、H 2 O 2 At least one of percarbamide, sodium persulfate, oxone, sodium dichloroisocyanurate, and sodium ferrate;
preferably, the oxidizing agent is selected from at least one of sodium persulfate, potassium hydrogen persulfate, dichloroisocyanuric acid, and calcium hypochlorite.
5. The sludge deodorization conditioner as claimed in claim 1, wherein the skeleton-constituting agent is at least one selected from the group consisting of diatomaceous earth powder, fly ash, pulverized coal, gangue powder, blast furnace dust and zeolite powder.
6. The sludge deodorization conditioner as claimed in claim 1, wherein the first conditioner is a mixture of the crosslinking agent and the charge neutralizer, and the mixing mass ratio of the crosslinking agent to the charge neutralizer in the first conditioner is (0.1-5): 1;
preferably, the second conditioner is a mixture of the oxidant and the skeleton building agent, and the mixing mass ratio of the oxidant to the skeleton building agent in the second conditioner is 1: (0.01-10).
7. A treatment method for sludge deodorization stabilization by using the sludge deodorization conditioner as claimed in any one of claims 1 to 6, which is characterized by comprising the steps of: firstly, mixing the sludge to be treated with the first conditioner, and then adding the second conditioner for mixing.
8. The treatment method according to claim 7, characterized in that the first conditioner is added in an amount of 0.1-50% of the mass of the sludge to be treated; more preferably, the adding amount of the first conditioner accounts for 1-8% of the mass of the sludge to be treated;
preferably, the addition amount of the second conditioner accounts for 0.1-50% of the mass of the sludge to be treated; more preferably, the adding amount of the second conditioner accounts for 4-22% of the mass of the sludge to be treated.
9. The treatment method according to claim 8, characterized in that the first conditioner is mixed with the sludge to be treated and then stirred at a stirring speed of 50-500 rpm for 5-60min;
preferably, after the second conditioner is added, stirring is carried out for 5-60min at a stirring speed of 30-200 revolutions/minute.
10. The treatment method according to claim 9, wherein the sludge to be treated is municipal concentrated sludge having a water content of 95 to 99% or municipal dewatered sludge having a water content of about 80%.
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| CN117401878A (en) * | 2023-12-14 | 2024-01-16 | 内蒙古博裕农业科技有限责任公司 | Method for efficiently dehydrating sludge and application thereof |
| CN117401878B (en) * | 2023-12-14 | 2024-02-13 | 内蒙古博裕农业科技有限责任公司 | Method for efficiently dehydrating sludge and application thereof |
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