CN115745334A - Sludge deodorization conditioner and sludge deodorization stabilization treatment method - Google Patents

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

A sludge deodorization conditioner and a treatment method for sludge deodorization stabilization

technical field

The invention relates to the field of municipal sludge treatment, in particular to a sludge deodorizing conditioner and a sludge deodorizing and stabilizing treatment method.

Background technique

With the rapid development of cities, the amount of sewage treatment has increased sharply. Sludge is an important by-product of sewage treatment, and its harmless disposal has always been an important bottleneck restricting the healthy development of sewage treatment plants. Sludge composting, incineration, brick making, pottery making and other resource utilization premise and the most important link is dehydration of sludge first. However, because sludge is an extremely complex heterogeneous body composed of bacterial cells, organic fragments, inorganic particles, colloids, etc., and has a very high water content (up to 99%), high organic matter content, and is extremely perishable. It is smelly, and the particles are finer, the specific gravity is smaller, and it is in a colloidal liquid state, so it is difficult to separate solids and liquids by conventional sedimentation.

At present, the sludge dewatering processes commonly used in sewage plants in major cities are: (1) Cationic polyacrylamide (CPAM) combined with centrifugal dehydration process, but the dehydration efficiency is not high, and the moisture content of sludge is still 80% after dehydration On the left and right, the sludge is still viscous and fluid, and it is easily corrupted and smelly, and the environmental sanitation is poor, which seriously affects the physical and mental health of the staff and the subsequent utilization of resources. (2) Iron salt, lime combined plate and frame filter press dehydration process, this process improves the sludge dehydration efficiency to a certain extent, and the moisture content of the mud cake can be reduced to below 50% under optimal conditions, but this process cannot eliminate microorganisms Easily degradable organic matter, the sludge after treatment is still black and smelly, it is difficult to make bricks and other resources, and it is difficult to incinerate due to the addition of a large amount of lime, so it can only be landfilled, resulting in a great waste of sludge resources . (3) Centrifugal dehydration combined with low-temperature drying process. This process is to reduce the moisture content to 72% by adding coal gangue, lime, etc. to the centrifugally dehydrated sludge (with a moisture content of 80%), and then use the sludge The strip cutting machine performs low-temperature drying after cutting the strips. Although the moisture content of the sludge can be reduced to about 40% after drying, there are odor problems in the production process, and the production energy consumption is high, environmental hygiene problems and low production cost performance lead to this process. Difficult to promote.

Moreover, many sludge conditioners currently have many components, the preparation process is too complicated, and the pH value of the sludge needs to be adjusted to neutral or acidic before use, thereby increasing the production cost of the conditioner and the difficulty of popularization and application.

In view of this, the present invention is proposed.

Contents of the invention

The object of the present invention is to provide a sludge deodorizing conditioner to fully release sludge bound water and eliminate odorous organic matter that is easily degraded by microorganisms in sludge, thereby greatly improving the dehydration performance and compressibility of sludge and eliminating sludge It also stabilizes the dehydrated sludge, and long-term stacking will no longer produce odor and pathogens, paving the way for the smooth utilization of subsequent sludge resources. In addition, the method also provides a sludge deodorization treatment method, which greatly simplifies the technological process, has high dehydration efficiency, and does not need to separately adjust the pH value of the sludge.

The present invention is achieved like this:

In a first aspect, the present invention provides a sludge deodorizing conditioner, which includes: a first conditioner and a second conditioner, the first conditioner includes a cross-linking agent and a neutralizer for neutralizing the surface charge of the sludge The tempering agent, the second conditioning agent includes an oxidizing agent and a backbone building agent.

The electric potential of the sludge colloid is neutralized by the charge neutralizing agent in the first conditioner, the electric double layer of the sludge colloid is compressed, the Zeta potential of the sludge colloid is reduced, and the sludge colloid particles aggregate. The destabilized sludge particles were captured and aggregated by the functional structure of the cross-linking agent. At the same time, the first conditioning agent can increase the osmotic pressure of the sludge microbial cells, causing the microorganisms to die and the cells to rupture and dehydrate. In addition, the primary conditioning agent acts to activate the oxidizing agent.

The oxidant in the second conditioner can chemically "cut" and destroy molecular structures such as proteins, ammonia, organic amines, methyl mercaptan, and skatole in the sludge, for example, it can destroy the structure of bacterial micelles and cell walls, and make it easy to produce vulcanization The protein molecular structure and functional groups of hydrogen, ammonia, methyl mercaptan and other substances are broken and transformed, thereby eliminating the source of sludge odor substances and making the sludge no longer emit odor. At the same time, the oxidant in the second conditioner further destroys the biodegradable components (soluble organic carbon (DOC), soluble protein, amino acid, etc.) in the sludge under the activation of the first conditioner, and improves the biochemical stability of the sludge. In addition, under the synergistic effect of the first conditioner and the second conditioner, crystal particles can be produced to construct a water-permeable network skeleton (ie, dehydration skeleton) and water conservancy channels, thereby improving the dehydration performance of the conditioned sludge. Through the above conditioning, the conditioned sludge is stabilized, and the dehydration performance is greatly improved. After dehydration, the mud cake no longer releases foul smell and rebounds, ensuring the smooth subsequent resource utilization of sludge (incineration, brick making, pottery making, etc.) implement.

With the sludge specific resistance (SRF) and the water content of the mud cake as evaluation indicators, after conditioning and dehydration by the sludge deodorizing conditioner provided by the present invention, compared with before conditioning, the optimal sludge deodorization conditioner can make The specific resistance of the sludge is reduced by 85%-92%, and the water content of the mud cake is reduced to 30%-58%.

In a preferred embodiment of the application of the present invention, the crosslinking agent is selected from at least one of carboxymethylcellulose sodium (CMC-Na), artificially synthesized organic flocculants and inorganic flocculants.

The above-mentioned cross-linking agent has high adsorption activity, can adsorb fine particles in the sludge to form larger flocs, and at the same time form a water conservancy channel with the skeleton builder to achieve the purpose of improving the dewatering performance of the sludge. The water conservancy channel means that the cross-linking agent adsorbs the particles in the sludge to form larger flocs. After the larger flocs are grafted or contacted with the skeleton construction agent, they can retain larger gaps so that water can shuttle freely, thereby achieving higher dehydration efficiency. If large flocs are not formed, the sludge itself has finer particles and a smaller specific gravity, making it difficult to achieve solid-liquid separation quickly and efficiently.

On the one hand, the skeleton builder has a microporous structure. In addition, compared with sludge particles, after being combined with crosslinking agents and flocs, it has higher hardness and is not easy to collapse, which is conducive to the formation of stable water conservancy channels, so as to achieve High dehydration efficiency.

In an optional 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 ) at least one of ₃ .

In an optional embodiment, 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 .

In a preferred embodiment of the application of the present invention, the charge neutralizer is an anionic charge neutralizer.

In an optional embodiment, 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 , quaternary ammonium salts and at least one of quaternary ammonium bases.

In an optional embodiment, the negative charge neutralizer is selected from at least one of FeSO ₄ and FeCl ₂ .

In a preferred embodiment of the present invention, the oxidizing agent is selected from perbromate, perchlorate, periodate, persulfate, permanganate, ferric nitrate, calcium peroxide, hydrogen peroxide, di At least one of sodium chloroisocyanurate, sodium ferrate, nitrite compound, perborate compound, hypochlorite compound, chlorite compound and percarbamide.

In an optional embodiment, the oxidizing agent is selected from KMnO ₄ , KClO ₃ , NaClO ₂ , Ca(ClO ₂ ) ₂ , CaO ₂ , H ₂ O ₂ , percarbamide, sodium persulfate, potassium hydrogen persulfate, At least one of sodium dichloroisocyanurate and sodium ferrate;

In an optional embodiment, the oxidizing agent is at least one selected from sodium persulfate, potassium hydrogen persulfate, dichloroisocyanuric acid and calcium hypochlorite.

Take the ferrous salt in the first conditioning agent, sodium salt and the hypochlorite in the second conditioning agent as an example, its action process is as follows:

2Fe ²⁺ +ClO ^- +4OH ^- +H ₂ O＝2Fe(OH) ₃ ↓+Cl ^-

The hypochlorite ion oxidizes Fe ²⁺ to Fe ³⁺ in an alkaline environment, and then combines with ^OH in the alkali to form Fe(OH) ₃ precipitation. In the solution, Fe(OH) ₃ is colloidal, which can remove sludge Accumulation of medium particles to form precipitates and removal. At the same time, hypochlorite ions can penetrate the cell wall and cell membrane of microorganisms, destroy the molecular structure of microorganisms such as proteins and nucleic acids, and eventually lead to the death of microorganisms and achieve the purpose of stabilizing sludge.

At the same time, in an alkaline environment, hypochlorite ions can continue to oxidize ferric hydroxide into ferrate ions.

3NaClO+10NaOH+2FeCl ₃ ＝2Na ₂ FeO ₄ +6NaCl+5H ₂ O

Iron in ferrate ions is the highest valence state + 6 valence, which has very strong oxidizing properties and can oxidize most organic substances with selectivity. The reaction equation of ferrate in alkaline solution, weak alkaline, neutral and slightly acidic and acidic solution environment is as follows:

In neutral environment: FeO ₄ ^2- +4H ₂ O+3e-＝Fe(OH) ₃ +5H ₂ O

Under alkaline environment: FeO ₄ ^2- +4OH ^- +3e-＝Fe(OH) ₃ +OH ^-

Under acidic environment: FeO ₄ ^2- +8H ⁺ +3e-＝Fe ³⁺ +4H ₂ O

The mechanism by which ferrate ion breaks the chains of protein, fat, amino acid and other macromolecules in sludge and improves the dehydration performance is mainly through its strong oxidative properties, the coagulation aiding effect of hydrolyzate, and the higher adsorption of the final product Fe(OH) ₃ The synergistic effect of the active three is completed. Strong oxidative properties can destroy the organic protective layer on the surface of the colloid, making it easy to destabilize, while its high-valent positively charged hydrolyzed product destabilizes the inorganic colloid in water through electrical neutralization, and the final Fe(OH) ₃ can adsorb flocs And smaller particles in the water to form larger flocs, and at the same time form a hydraulic channel with the skeleton builder to improve the sludge dewatering performance.

In an optional embodiment, choose not to directly add ferrate as an oxidizing agent, this setting is because ferrate itself is easy to inactivate, and the preparation cost is high, and the oxidizing agent such as hypochlorite is used to oxidize ferrous salt to prepare Ferrate has the advantages of low preparation cost and ready-to-use.

In a preferred embodiment of the application of the present invention, the skeleton construction agent is at least one selected from diatomaceous earth powder, fly ash, coal powder, coal gangue powder, blast furnace ash and zeolite powder.

In a preferred embodiment of the present invention, the first conditioning agent is a mixture of the crosslinking agent and the charge neutralizing agent, and the mixing mass ratio of the crosslinking agent and the charge neutralizing agent in the first conditioning agent is (0.1- 5): 1.

Under the above mixing mass ratio, it has good sludge dehydration efficiency and good effect of removing fishy smell. 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 conditioning agent is a mixture of an oxidizing agent and a skeleton building agent, and the mixing mass ratio of the oxidizing agent and the skeleton building agent in the second conditioning agent 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 packaged separately and added separately when used.

In the second aspect, the present invention also provides a treatment method for sludge deodorization and stabilization using a sludge deodorization conditioner, which includes the following steps: first fully stirring and mixing the sludge to be treated with the first conditioner, Then add the second conditioner to fully stir and mix.

Using the above-mentioned sludge deodorizing conditioner for sludge conditioning can be used directly without adjusting the pH value of the sludge in advance, which simplifies the sludge conditioning process, saves a lot of costs, and improves the sludge treatment efficiency. Excellent economic benefits.

The conditioning process provided by the invention is simple and efficient, and the conditioning program can realize computer automatic control, which is easy for industrialization and large-scale production.

In other embodiments, the conditioned sludge is pumped into a high-pressure belt machine or a plate-and-frame filter press to achieve deep dehydration and stabilization of the sludge.

In a preferred embodiment of the application of the present invention, the first conditioner is firstly mixed with the sludge to be treated, and then the second conditioner is added for thorough stirring and mixing. Such a conditioning step can significantly improve the dehydration of the conditioned sludge; if the conditioning sequence is changed, the second conditioner will make the sludge particles more finely divided, and it is difficult to form dense and larger flocs through the first conditioner, resulting in the dehydration of the conditioned sludge. The dehydration performance is significantly reduced.

In an optional embodiment, the addition of the first 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 optional embodiment, the addition amount of the first conditioner accounts for 1%-8% of the mass of the sludge to be treated.

In an optional embodiment, the 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 optional embodiment, the amount of the second conditioner accounts for 4%-22% of the mass of the sludge to be treated.

When the first conditioner is combined with the second conditioner in the above-mentioned addition amount, it has good fishy odor removal effect and dehydration efficiency.

In a preferred embodiment of the application of the present invention, after mixing the first conditioner with the sludge to be treated, stir at a stirring speed of 50-500 rpm for 5-60 min;

In an optional embodiment, after adding the second conditioner, stir at a stirring speed of 30-200 rpm for 5-60 min.

In a preferred embodiment of the application of the present invention, the sludge to be treated is municipal thickened sludge with a water content of 95% to 99% or municipal dewatered sludge with a water content of about 80%.

The present invention has the following beneficial effects:

In the present invention, the charge neutralizer in the first conditioner neutralizes the potential of the sludge colloid, compresses the electric double layer of the sludge colloid, reduces the Zeta potential of the sludge colloid, and then aggregates the sludge colloid particles. The destabilized sludge particles were captured and aggregated by the functional structure of the cross-linking agent. At the same time, the first conditioning agent can increase the osmotic pressure of the sludge microbial cells, causing the microorganisms to die and the cells to rupture and dehydrate. In addition, the primary conditioning agent acts to activate the oxidizing agent.

The oxidant in the second conditioner can chemically "cut" and destroy molecular structures such as proteins, ammonia, organic amines, methyl mercaptan, and skatole in the sludge, for example, it can destroy the structure of bacterial micelles and cell walls, and make it easy to produce vulcanization The protein molecular structure and functional groups of hydrogen, ammonia, methyl mercaptan and other substances are broken and transformed, thereby eliminating the source of sludge odor substances and making the sludge no longer emit odor. At the same time, the oxidant in the second conditioner further destroys the biodegradable components (soluble organic carbon (DOC), soluble protein, amino acid, etc.) in the sludge under the activation of the first conditioner, and improves the biochemical stability of the sludge.

In addition, under the synergistic effect of the first conditioner and the second conditioner, crystal particles can be produced to construct a water-permeable network skeleton (ie, dehydration skeleton) and water conservancy channels, thereby improving the dehydration performance of the conditioned sludge. Through the above conditioning, the conditioned sludge is stabilized, and the dehydration performance is greatly improved. After dehydration, the mud cake no longer releases foul smell and rebounds, ensuring the smooth subsequent resource utilization of sludge (incineration, brick making, pottery making, etc.) implement.

Using the sludge deodorizing conditioner provided by the invention for sludge conditioning can be used directly without adjusting the pH value of the sludge in advance, which simplifies the sludge conditioning process, saves a lot of cost, and improves the sludge treatment efficiency. Sludge treatment has excellent economic benefits. The conditioning process provided by the invention is simple and efficient, and the conditioning program can realize computer automatic control, which is easy for industrialization and large-scale production.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

Fig. 1 is a schematic diagram of the effect of sludge colloidal particles being electrically neutralized and aggregated after the first conditioner of the present invention is added;

Fig. 2 is a schematic diagram of the effect of breaking the cell wall of the bacteria gelatin group and releasing bound water after the second conditioner of the present invention is added;

Fig. 3 is the sample figure of the sludge mud cake after the conditioning process of embodiment 1;

Fig. 4 is the sludge mud cake sample figure after the conditioning process of embodiment 2;

Fig. 5 is the sludge mud cake sample figure after the conditioning process of embodiment 3;

Fig. 6 is the sludge mud cake sample figure after the conditioning process of embodiment 4;

Fig. 7 is the sludge mud cake sample figure after the conditioning process of embodiment 5;

Fig. 8 is the sludge mud cake sample figure after the conditioning process of embodiment 6;

Fig. 9 is the sludge mud cake sample figure after the conditioning process of embodiment 7;

Fig. 10 is a sample diagram of the sludge cake after being conditioned by the conditioning process of Example 8.

Detailed ways

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. In fact, 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 example, 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 deodorizing conditioner of the present invention is shown in Figure 1 and Figure 2. Figure 1 is a schematic diagram of the effect of the sludge colloidal particles being electrically neutralized and aggregated after the first conditioner of the present invention is added. The electric double layer of colloidal particles with negative charge is neutralized and compressed by the first conditioner, while the destabilized sludge particles are captured and agglomerated by the functional structure of the first conditioner; Schematic diagram of the effect of cracking the cell wall of bacterial micelles in sludge and releasing bound water. Excited by the first conditioning agent, the functional group of the second conditioning agent destroys the bacterial micelle structure and cell wall, and makes the protein molecular structure and functional groups that are prone to produce hydrogen sulfide, ammonia, methyl mercaptan and other substances break and transform, thereby Eliminate the source of sludge malodorous substances, and at the same time, the first conditioner and the second conditioner react to form water-insoluble crystal particles, build a sludge dehydration framework and water conservancy channels, and greatly improve the dewatering performance of sludge. Taking sludge specific resistance (SRF) and mud cake water content as evaluation indicators, after being conditioned and dehydrated by the sludge deodorizing conditioner of the present invention, compared with before conditioning, the sludge specific resistance has decreased by 85%-92%, and the sludge The moisture content of the cake is reduced to 30%-58%.

Sludge specific resistance refers to the resistance of unit filtration area when a unit mass of sludge is filtered under a certain pressure.

In order to make the purpose, 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. Those who do not indicate the specific conditions in the examples are carried out according to the conventional conditions or the conditions suggested by the manufacturer. The reagents or instruments used were not indicated by the manufacturer, and they were all conventional products that could be purchased from the market.

The characteristics and performance of the present invention will be described in further detail below in conjunction with the examples.

In the following examples and comparative examples, agent A is the first conditioner, agent B is the second conditioner, and municipal sludge deodorization and deodorization stabilization AB conditioner is the sludge deodorization conditioner.

Example 1

A stabilized AB conditioner for municipal sludge deodorization and deodorization, the A agent is made by mixing NaCl, FeSO ₄ and CPAM, and the B agent is made by mixing potassium hydrogen persulfate, CaO ₂ and diatomaceous earth powder. The weight ratio of NaCl, FeSO ₄ and CPAM in agent A is 1:5:0.1; the weight ratio of potassium persulfate, CaO ₂ and diatomaceous earth powder in agent B is 4:2:1.

Sludge from the thickening tank of Lanzhou City Municipal Sewage Treatment Plant was measured. The moisture content of the sludge was 97.3%, the pH was 7.8, the sludge was black, and had an unpleasant odor. The conditioning process is as follows:

(1) Add Agent A to the sludge, the dosage of Agent A is 0.4% of the dry weight of the sludge, and fully mix and stir for 25 minutes at a speed of 300r/min;

(2) Then add agent B, the dosage of agent B is 0.4% of the dry weight of sludge, and fully mix and stir at 150r/min for 20min.

It has been determined that the specific resistance of the sludge after conditioning is reduced by 88.3%. After the sludge sample is vacuum filtered at 0.074Mpa, the mud cake is khaki-yellow and has a moisture content of about 73%. The cake sample does not rebound after being placed for 3 days, and does not produce any foul smell.

Example 2

A stabilized AB conditioner for municipal sludge deodorization and deodorization, the A agent is made by mixing FeSO ₄ , AlCl ₃ and CPAM, and the B agent is made by mixing MgO and Ca(ClO)2 powder. The weight ratio of FeSO ₄ , AlCl ₃ and CPAM in agent A is 1:1:0.1; the weight ratio of MgO to Ca(ClO)2 in agent B is 1:1.

Sludge from the thickening tank of Lanzhou City Municipal Sewage Treatment Plant was measured. The moisture content of the sludge was 97.3%, the pH was 7.8, the sludge was black, and had an unpleasant odor. The conditioning process is as follows:

(1) Add Agent A to the sludge, the dosage of Agent A is 11% of the dry weight of the sludge, and fully mix and stir for 10 minutes at a speed of 300r/min;

(2) Then add agent B, the dosage of agent B is 37% of the dry weight of sludge, and fully mix and stir at 150r/min for 10min.

It was determined that the specific resistance of the sludge after conditioning was reduced by 82.6%. After the sludge sample was vacuum filtered at 0.074Mpa, the mud cake was khaki, with a moisture content of about 83.5%, and no foul smell; the mud cake sample was left for 3 days. No rebound, no foul smell.

Example 3

A stabilized AB conditioner for municipal sludge deodorization and deodorization, agent A is made by mixing CH ₃ COONa, MgCl ₂ , Fe ₂ (SO ₄ ) ₃ , agent B is made by mixing CaO and Ca(ClO)2 powder . The weight ratio of CH ₃ COONa, MgCl ₂ , Fe ₂ (SO4) ₃ in agent A is 1:1:5; the weight ratio of CaO and Ca(ClO)2 in agent B is 1:2.

Sludge from the thickening tank of Lanzhou City Municipal Sewage Treatment Plant was measured. The moisture content of the sludge was 97.3%, the pH was 7.8, the sludge was black, and had an unpleasant odor. The conditioning process is as follows:

(1) Add Agent A to the sludge, the dosage of Agent A is 3.6% of the dry weight of the sludge, and fully mix and stir at 200r/min for 15min;

(2) Then add agent B, the dosage of agent B is 22% of the dry weight of sludge, and fully mix and stir for 25 minutes at a speed of 150r/min.

It was determined that the specific resistance of the sludge after conditioning was reduced by 89.3%. After the sludge sample was vacuum filtered at 0.074Mpa, the mud cake was khaki, with a moisture content of about 78%, and no foul smell; the mud cake sample was left for 3 days. No rebound, no foul smell.

Example 4

A stabilized AB conditioner for municipal sludge deodorization and deodorization, agent A is made by mixing CaCl ₂ , MgCl ₂ and CPAM powder, and agent B is made by mixing sodium ferrate and blast furnace ash powder. The weight ratio of CaCl ₂ , MgCl ₂ and CPAM in agent A is 1:1:0.01; the weight ratio of sodium ferrate and blast furnace ash powder in agent B is 1:1.

Sludge from the thickening tank of Lanzhou City Municipal Sewage Treatment Plant was measured. The moisture content of the sludge was 97.3%, the pH was 7.8, the sludge was black, and had an unpleasant odor. The conditioning process is as follows:

(1) Add Agent A to the sludge, the dosage of Agent A is 8.4% of the dry weight of the sludge, and fully mix and stir at 150r/min for 12min;

(2) Then add agent B, the dosage of agent B is 12.6% of the dry weight of sludge, and fully mix and stir at 150r/min for 20min.

It was determined that the specific resistance of the sludge after conditioning was reduced by 85.6%. After the sludge sample was vacuum-filtered at 0.074Mpa, the mud cake was khaki, with a moisture content of about 80%, and no foul smell; the mud cake sample was left for 3 days. No rebound, no foul smell.

Example 5

A stabilized AB conditioner for municipal sludge deodorization and deodorization, agent A is composed of FeCl ₂ , Al ₂ (SO ₄ ) ₃ , and quaternary ammonium salt, agent B is composed of sodium dichloroisocyanurate and zeolite powder; The weight ratio of FeCl ₂ , Al ₂ (SO ₄ ) ₃ , and quaternary ammonium salt is 1:1:0.1; the weight ratio of sodium dichloroisocyanurate and zeolite powder in agent B is 1:3.

Sludge from the thickening tank of Lanzhou City Municipal Sewage Treatment Plant was measured. The moisture content of the sludge was 97.3%, the pH was 7.8, the sludge was black, and had an unpleasant odor. The conditioning process is as follows:

(1) Add Agent A to the sludge, the dosage of Agent A is 11% of the dry weight of the sludge, and fully mix and stir for 40min at a speed of 300r/min;

(2) Then add agent B, the dosage of agent B is 14.8% of the dry weight of the sludge, and fully mix and stir for 50 minutes at a speed of 200r/min.

It was determined that the specific resistance of the sludge after conditioning was reduced by 90.3%. After the sludge sample was vacuum filtered at 0.074Mpa, the mud cake was khaki, with a moisture content of about 78%, and no foul smell; the mud cake sample was left for 3 days. No rebound, no foul smell.

Example 6

A municipal sludge deodorizing and deodorizing stabilized AB conditioner, the A agent is composed of AlCl ₃ and CPAM powder, and the B agent is composed of Ca(ClO) ₂ , blast furnace ash and CaO. The weight ratio of AlCl ₃ , CPAM in agent A is 1:0.01, and the weight ratio of Ca(ClO) ₂ , blast furnace dust, and CaO in agent B is 2:1:1.

Sludge from the thickening tank of Zhucheng Municipal Wastewater Treatment Plant in Shandong Province was taken. It was determined that the moisture content of the sludge was 98.2%, the pH was 7.8, the sludge was black, and had an unpleasant odor. The conditioning process is as follows:

(1) Add Agent A to the sludge, the dosage of Agent A is 1.07% of the dry weight of the sludge, and fully mix and stir at 120r/min for 15min;

(2) Then add agent B, the dosage of agent B is 14.3% of the dry weight of sludge, and fully mix and stir at 100r/min for 10min.

It has been determined that the specific resistance of the sludge after conditioning is reduced by 89.6%. The sludge after conditioning is pumped into a plate-and-frame filter press, and after dehydration under a pressure of 0.6MPa, the sludge cake is brownish-yellow, has no foul smell and has a normal soil smell. The moisture content is 45%; the mud cake does not rebound after 3 days of stacking, and there is no foul smell.

Example 7

A stabilized AB conditioner for municipal sludge deodorization and deodorization, agent A is composed of FeCl ₂ , Al ₂ (SO ₄ ) ₃ , agent B is composed of dichloroisocyanuric acid, calcium hypochlorite, blast furnace ash, and zeolite powder . The weight ratio of FeCl ₂ and Al ₂ (SO ₄ ) ₃ in A agent is 2:1, and the weight ratio of B agent is composed of dichloroisocyanuric acid, calcium hypochlorite, blast furnace ash and zeolite powder is 1:1:1: 0.2.

Take the sludge dehydrated by centrifuge from Dalian Municipal Sewage Treatment Plant. It is measured that the moisture content of the sludge is 81.2%, the pH is 6.9, and the sludge is black plastic and smelly. The conditioning process is as follows:

(1) Add Agent A to the sludge, the dosage of Agent A is 2% of the dry weight of the sludge, and fully mix and stir for 40min at a speed of 200r/min;

(2) Then add agent B, the dosage of agent B is 4% of the dry weight of sludge, and fully mix and stir at 100r/min for 50min.

It has been determined that the specific resistance of the sludge after conditioning is reduced by 90.3%, and the sludge after conditioning is pumped into a plate and frame filter press, and after dehydration under a pressure of 0.8MPa, the mud cake is earthy yellow, has no foul smell and has a normal soil smell. The moisture content is about 60%; the mud cake does not rebound after being piled for 3 days, and there is no foul smell.

Example 8

A stabilized AB conditioner for municipal sludge deodorization and deodorization, agent A is composed of FeSO ₄ and AlCl ₃ , agent B is composed of sodium persulfate, potassium hydrogen persulfate and blast furnace ash powder. The weight ratio of FeSO ₄ and AlCl ₃ in agent A is 2:1, and the weight ratio of sodium persulfate, potassium hydrogen persulfate and blast furnace ash powder in agent B is 1:1:1.

Sludge from the thickening tank of Dalian Municipal Sewage Treatment Plant was taken. It was determined that the moisture content of the sludge was 97.3%, the pH was 7.1, and the sludge was black and viscous with a fishy smell. The conditioning process is as follows:

(1) Add Agent A to the sludge, the dosage of Agent A is 8% of the dry weight of the sludge, and fully mix and stir at 180r/min for 30min;

(2) Then add agent B, the dosage of agent B is 22% of the dry weight of sludge, and fully mix and stir for 60 minutes at a speed of 100r/min.

It has been determined that the specific resistance of the sludge after conditioning is reduced by 92.1%. The sludge after conditioning is pumped into a plate-and-frame filter press, and after dehydration under a pressure of 0.8MPa, the mud cake is earthy yellow, has no foul smell and has a normal earthy smell. The moisture content is 58%; the mud cake does not rebound after being piled for 3 days, and there is no foul smell.

Example 9

A municipal sludge deodorizing and deodorizing stabilized AB conditioner, the A agent is composed of FeSO ₄ and polyethyleneimine, and the B agent is composed of CaO ₂ and coal gangue powder. The weight ratio of FeSO ₄ and polyethyleneimine in agent A is 1:0.01, and the ratio of CaO ₂ and coal gangue powder in agent B is 4:1.

Sludge from the thickening tank of Dalian Municipal Sewage Treatment Plant was taken. It was determined that the moisture content of the sludge was 97.3%, the pH was 7.1, and the sludge was black and viscous with a fishy smell. The conditioning process is as follows:

(1) Add Agent A to the sludge, the dosage of Agent A is 8% of the dry weight of the sludge, and fully mix and stir at 180r/min for 30min;

(2) Then add agent B, the dosage of agent B is 22% of the dry weight of sludge, and fully mix and stir for 60 minutes at a speed of 100r/min.

Comparative example 1

Compared with Example 7, agent A is composed of FeCl ₂ and Al ₂ (SO ₄ ) ₃ , agent B is only composed of blast furnace ash and zeolite powder, and agent B does not contain dichloroisocyanuric acid or calcium hypochlorite. Under the conditions of the same dosing sequence and mixing time, the dewatering performance of the conditioned sludge is poor, the properties of the mud cake are unstable, and it is easy to turn black and smell bad. The laboratory test results show that: the conditioner formula of Comparative Example 1 is used, and the vacuum dehydration time of the sample is 20 minutes; the mud cake turns black and smelly after 24 hours of storage.

The results of the small laboratory test of Example 7 are (repeat 1): the sample vacuum dehydration time is 4min 30sec; there is no black and smelly phenomenon after the mud cake is stored for 72h.

Comparative example 2

Compared with Example 7, agent A is composed of FeCl ₂ and Al ₂ (SO ₄ ) ₃ , and agent B is composed of only dichloroisocyanuric acid and calcium hypochlorite. The only difference is that agent B does not contain blast furnace ash and zeolite powder, and the rest of the raw materials are the same, and the preparation method is the same.

Under the conditions of the same dosing sequence and mixing time, the dewatering performance of the conditioned sludge is poor. The laboratory test results show that: the conditioner formula of Comparative Example 2 is adopted, and the vacuum dehydration time of the sample is 15min 35sec.

The results of the small laboratory test of Example 7 are (repeat 2): the vacuum dehydration time of the sample is 4min 10sec; there is no black and smelly phenomenon after the mud cake is stored for 72h.

Comparative example 3

Compared with Example 7, the only difference is that agent A does not contain Al ₂ (SO ₄ ) ₃ , and the rest of the raw materials are the same, and the preparation method is the same. Agent A is composed of FeCl ₂ , and agent B is composed of dichloroisocyanuric acid, calcium hypochlorite, blast furnace ash, and zeolite powder. Under the conditions of the same dosing sequence and mixing time, the dewatering performance of the conditioned sludge is poor.

The laboratory test results show that: the conditioner formula of Comparative Example 3 is adopted, and the vacuum dehydration time of the sample is 9min20sec. The results of the small laboratory test of Example 7 are (repeat 3): the vacuum dehydration time of the sample is 4min 25sec; there is no black and odor phenomenon after the mud cake is stored for 72h.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A sludge deodorizing conditioner, characterized in that it comprises: a first conditioner and a second conditioner, wherein the first conditioner comprises a cross-linking agent and is used to neutralize sludge surface charges The second conditioning agent includes an oxidizing agent and a backbone building agent. 2. sludge deodorizing conditioner according to claim 1, is characterized in that, described linking agent is selected from at least one in sodium carboxymethylcellulose, artificially synthesized organic flocculants and inorganic flocculants; Preferably, 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 Preferably, the synthetic organic flocculant is selected from cationic polyacrylamide, and the inorganic flocculant is selected from AlCl ₃ and Al ₂ (SO ₄ ) ₃ . 3. sludge deodorizing conditioning agent according to claim 1, is characterized in that, described charge neutralizer is 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 , quaternary ammonium salts and quaternary ammonium bases at least one of Preferably, the negative charge neutralizer is selected from at least one of FeSO ₄ and FeCl ₂ . 4. sludge deodorizing conditioner according to claim 1, is characterized in that, described oxygenant is selected from perbromate, perchlorate, periodate, persulfate, permanganate, nitric acid Iron, calcium peroxide, hydrogen peroxide, sodium dichloroisocyanurate, sodium ferrate, nitrite compounds, perborate compounds, hypochlorite compounds, chlorite compounds, and percarbamides at least one; Preferably, the oxidizing agent is selected from KMnO ₄ , KClO ₃ , NaClO ₂ , Ca(ClO ₂ ) ₂ , CaO ₂ , H ₂ O ₂ , percarbamide, sodium persulfate, potassium hydrogen persulfate, dichloroisocyanuric acid at least one of sodium and sodium ferrate; Preferably, the oxidizing agent is at least one selected from sodium persulfate, potassium hydrogen persulfate, dichloroisocyanuric acid and calcium hypochlorite. 5. sludge deodorizing conditioner according to claim 1, is characterized in that, described framework construction agent is selected from diatomite powder, fly ash, coal powder, coal gangue powder, blast furnace ash and zeolite powder at least one. 6. The sludge deodorizing conditioner according to claim 1, characterized in that, the first conditioner is a mixture of the crosslinking agent and the charge neutralizer, and in the first conditioner The mixing mass ratio of the crosslinking agent to the charge neutralizing agent is (0.1-5):1; Preferably, the second conditioning agent is a mixture of the oxidizing agent and the skeleton building agent, and the mixing mass ratio of the oxidizing agent and the skeleton building agent in the second conditioning agent is 1:(0.01-10). 7. A treatment method for sludge deodorization and stabilization using the sludge deodorization conditioner described in any one of claims 1-6, characterized in that it comprises the steps of: first mixing the sludge to be treated with the The first conditioning agent is mixed, and then the second conditioning agent is added and mixed. 8. The treatment method according to claim 7, characterized in that, the added amount of the first conditioner accounts for 0.1%-50% of the mass of the sludge to be treated; more preferably, the first conditioner The amount of addition accounts for 1%-8% of the quality of the sludge to be treated; Preferably, the added amount of the second conditioner accounts for 0.1%-50% of the mass of the sludge to be treated; more preferably, the added amount of the second conditioner accounts for 4% of the mass of the sludge to be treated %-twenty two%. 9. The treatment method according to claim 8, characterized in that, after mixing the first conditioner with the sludge to be treated, stir at a stirring speed of 50-500 rpm for 5-60 min; Preferably, after adding the second conditioner, stir at a stirring speed of 30-200 rpm for 5-60 min. 10 . The treatment method according to claim 9 , wherein the sludge to be treated is municipal thickened sludge with a water content of 95% to 99% or municipal dewatered sludge with a water content of about 80%. 11 .

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