CN107500404B - Composite uncoupler for sludge reduction and preparation method thereof - Google Patents
Composite uncoupler for sludge reduction and preparation method thereof Download PDFInfo
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- CN107500404B CN107500404B CN201711000488.8A CN201711000488A CN107500404B CN 107500404 B CN107500404 B CN 107500404B CN 201711000488 A CN201711000488 A CN 201711000488A CN 107500404 B CN107500404 B CN 107500404B
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- dinitrophenol
- uncoupler
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- diatomite
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
A composite uncoupler for sludge reduction comprises 2, 4-dinitrophenol, soluble nickel salt solute and refined diatomite; wherein the weight ratio of the 2, 4-dinitrophenol to the soluble nickel salt to the refined diatomite is 1: (0.055-0.37): (0.1055-1.37). The preparation method of the compound uncoupler comprises the following steps: weighing 2, 4-dinitrophenol, soluble nickel salt and refined diatomite according to the proportion; preparing 2, 4-dinitrophenol into a 2, 4-dinitrophenol solution with the concentration of 5.5-12 mg/L; and uniformly mixing the 2, 4-dinitrophenol solution, soluble nickel salt and refined diatomite to prepare the composite uncoupler for sludge reduction. The compound uncoupler of the invention keeps good sludge reduction effect, simultaneously can obviously weaken the damage of the uncoupler to the sludge performance, and improve the problem of water quality deterioration caused by adding the uncoupler, so that the system can still keep the treatment effect which should be achieved after DNP is added.
Description
The technical field is as follows:
the invention belongs to the technical field of uncouplers, and particularly relates to a composite uncoupler for sludge reduction and a preparation method thereof.
Background art:
the activated sludge process is a sewage biological treatment technology which is widely used in the world so far, but the generated excess sludge causes direct or indirect pollution to the environment, so that the excess sludge is very necessary to be treated. The yield of the excess sludge is generally large and accounts for 0.3-0.5% of the sewage treatment capacity (the water content is 97%). Meanwhile, the investment and operation cost of sludge treatment is huge, and almost accounts for 25-65% of the investment and operation cost of the whole sewage treatment plant. The disposal of excess sludge becomes a heavy burden for sewage treatment plants. Therefore, it has been a subject of great interest to reduce or minimize the rate of excess sludge production in activated sludge wastewater treatment processes. The conventional sludge reduction techniques mainly include a recessive growth method, a biological capture method, an uncoupling method and the like, and although the methods have obvious advantages and disadvantages respectively, the uncoupling method is relatively more acceptable and has more development prospect because the reduction of the sludge yield is maximum.
ATP is involved in the synthesis and catabolism processes of organisms, and energy (ATP) and raw materials are provided for anabolism through ATP generated by anabolism and small molecular organic compounds, so that normal life activities of the organisms are maintained. ATP is generated by phosphorylation of ADP in the biological oxidative phosphorylation process, the addition of a decoupling agent decouples anabolism and catabolism of the activated sludge, most of the energy generated in the catabolism process is dissipated in the form of heat, ATP cannot be synthesized effectively, and therefore, the addition of the decoupling agent effectively inhibits anabolism and promotes catabolism, namely, the metabolic rate is greater than the synthesis rate. When the microorganism oxidizes the substrate, the self-synthesis speed is reduced, the overall apparent yield coefficient is reduced, and the sludge yield is reduced.
Common uncouplers in the prior art are 2, 4-dinitrophenol, trichlorophenol, 2, 4-dichlorophenol, 3, 4, 5-tetrachlorosalicylamide, and the like. Among them, DNP is most widely used because it has the most significant effect of reducing the amount of excess sludge, and the sludge yield can be reduced by 60% in some activated sludge treatment processes. Although all uncouplers have a common disadvantage of reducing the activity of the sludge after addition to the system, this disadvantage of DNP is more pronounced but is relatively more harmful to the microorganisms.
The invention content is as follows:
the invention aims to provide a composite uncoupler for sludge reduction and a preparation method thereof, which takes 2, 4-Dinitrophenol (DNP) as a main component and can reduce the side effect of sludge performance reduction caused by DNP addition in a sewage treatment system to the minimum by adding other auxiliary components.
In order to achieve the purpose, the invention adopts the following technical scheme:
a composite uncoupler for sludge reduction comprises 2, 4-dinitrophenol, soluble nickel salt and refined diatomite; wherein the weight ratio of the 2, 4-dinitrophenol to the soluble nickel salt to the refined diatomite is 1: (0.055-0.37): (0.1055-1.37).
The soluble nickel salt is nickel chloride.
The specific surface area of the diatomite is 30-60 m2/g。
The preparation method of the composite uncoupler for sludge reduction comprises the following steps:
(1) weighing 2, 4-dinitrophenol, soluble nickel salt and refined diatomite according to the proportion;
(2) preparing 2, 4-dinitrophenol into a 2, 4-dinitrophenol solution with the concentration of 5.5-12 mg/L;
(3) and uniformly mixing the 2, 4-dinitrophenol solution, soluble nickel salt and refined diatomite to prepare the composite uncoupler for sludge reduction.
The working principle of the invention is as follows:
in the activated sludge process sewage treatment system, sewage and sludge are not in a homogeneous mixed state with each other, and the sludge is suspended in the system mainly in the form of micelle particles despite the mechanical stirring action of aeration. In experiments, the inventors found that the damage of DNP to microorganisms is strongly correlated with the concentration of DNP in the aqueous phase, with higher concentrations causing greater damage to microorganisms. The uncoupling effect of DNP is greatly related to the concentration of DNP in the sludge micelle particles, and the uncoupling effect is larger when the concentration is higher. In addition, nickel ions are indispensable trace elements for microorganisms, and a proper amount of nickel ions is helpful for improving the activity of microorganisms, thereby improving the efficiency of decomposing organic matters. The pure diatomite is porous, light in weight and small in relative density, the density of pure and dry diatomite is only 0.4-0.9 g/cm3, and the fine diatomite is large in pore size distribution range, high in porosity and strong in adsorption capacity, so that the settleability of activated sludge can be improved, and the quality of effluent water can be further improved by adsorbing organic matters in sewage. The essence of the invention is that DNP, soluble nickel salt and refined diatomite are mixed according to a certain concentration to prepare a composite uncoupler, and the inventor observes in experiments that the refined diatomite has larger porosity and specific surface and can adsorb substances with 3-4 times of self mass. Therefore, the adsorbent not only has stronger adsorption effect on DNP and divalent nickel ions, but also has large adsorption capacity. After DNP, soluble nickel salt and diatomite are mixed according to a certain concentration, the diatomite is adsorbed and loaded with DNP and divalent nickel ions like a carrier to form a 'loaded' composite uncoupler, and the DNP and the divalent nickel ions loaded on the 'carrier' do not diffuse rapidly in water like pure DNP and divalent nickel ions but are released slowly at a relatively low rate, so that the 'loaded' composite uncoupler can be regarded as a slow-release uncoupler. Further experiments by the inventors have found that the dissolution rate of the "loaded" complex decoupling agent in the wastewater is significantly slower when the agent is introduced into the system, and thus the concentration in the aqueous phase of the wastewater is significantly reduced, compared to pure DNP. On the other hand, because the diatomite is easy to aggregate and dissolve with the sludge micelle particles, DNP and divalent nickel ions are slowly released into the sludge micelle after the diatomite aggregates and dissolves with the sludge micelle particles, so that higher DNP and divalent nickel ion concentrations can be obtained in the sludge micelle.
DNP and divalent nickel ions have a good synergistic effect on the reduction of the decoupling activated sludge, and the DNP and the divalent nickel ions are matched in a proper proportion for use to reduce the total addition of the decoupling agent, so that the improvement of the sewage treatment efficiency is further facilitated.
The invention has the beneficial effects that:
(1) by adopting the composite uncoupler of the invention to treat sludge, the quality of effluent is improved relative to the DNP added independently on the premise of not influencing the decrement effect;
(2) the composite uncoupler disclosed by the invention is used for treating sludge, so that the performance of the sludge, including settleability and activity, can be obviously improved;
(3) compared with the single addition of DNP, the compound uncoupler of the invention can further reduce the sludge yield and can also reduce the addition of DNP.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to examples.
In the following examples 1 to 9 and comparative examples 1 to 2:
(1) the sludge reduction rate is defined as:
wherein the sludge yield 1 is the sludge yield without adding a decoupling agent in the system, and the sludge yield 2 is the sludge yield after adding the decoupling agent in the system;
(2) the composition and the ratio of the decoupling agent are shown in table 1.
TABLE 1
Example 1
A composite uncoupler for sludge reduction comprises 2, 4-dinitrophenol, nickel chloride and refined diatomite; wherein the weight ratio of the 2, 4-dinitrophenol to the nickel chloride to the diatomite is 1:0.055:0.1055, and the specific surface area of the diatomite is 30m2/g。
The preparation method of the composite uncoupler for sludge reduction comprises the following steps:
(1) weighing 2, 4-dinitrophenol, nickel chloride and refined diatomite according to the proportion;
(2) preparing 2, 4-dinitrophenol into a 2, 4-dinitrophenol solution with the concentration of 12 mg/L;
(3) and uniformly mixing the 2, 4-dinitrophenol solution, nickel chloride and diatomite to prepare the composite uncoupler for sludge reduction.
Example 2
A composite uncoupler for sludge reduction comprises 2, 4-dinitrophenol, nickel chloride and refined diatomite; wherein the weight ratio of the 2, 4-dinitrophenol to the nickel chloride to the refined diatomite is 1:0.069:0.20311, and the specific surface area of the refined diatomite is 50m2/g。
The preparation method of the composite uncoupler for sludge reduction comprises the following steps:
(1) weighing 2, 4-dinitrophenol, nickel chloride and refined diatomite according to the proportion;
(2) preparing 2, 4-dinitrophenol into a 2, 4-dinitrophenol solution with the concentration of 11.5 mg/L;
(3) and uniformly mixing the 2, 4-dinitrophenol solution, nickel chloride and diatomite to prepare the composite uncoupler for sludge reduction.
Example 3
A composite uncoupler for sludge reduction comprises 2, 4-dinitrophenol, nickel chloride and refined diatomite; wherein the weight ratio of the 2, 4-dinitrophenol to the nickel chloride to the refined diatomite is 1:0.092:0.33852, and the specific surface area of the refined diatomite is 55m2/g。
The preparation method of the composite uncoupler for sludge reduction comprises the following steps:
(1) weighing 2, 4-dinitrophenol, nickel chloride and refined diatomite according to the proportion;
(2) preparing 2, 4-dinitrophenol into a 2, 4-dinitrophenol solution with the concentration of 9 mg/L;
(3) and uniformly mixing the 2, 4-dinitrophenol solution, nickel chloride and diatomite to prepare the composite uncoupler for sludge reduction.
Example 4
A composite uncoupler for sludge reduction comprises 2, 4-dinitrophenol, nickel chloride and refined diatomite; wherein the weight ratio of the 2, 4-dinitrophenol to the nickel chloride to the refined diatomite is 1:0.11:0.4662, and the specific surface area of the refined diatomite is 40m2/g。
The preparation method of the composite uncoupler for sludge reduction comprises the following steps:
(1) weighing 2, 4-dinitrophenol, nickel chloride and refined diatomite according to the proportion;
(2) preparing 2, 4-dinitrophenol into a 2, 4-dinitrophenol solution with the concentration of 8.5 mg/L;
(3) and uniformly mixing the 2, 4-dinitrophenol solution, nickel chloride and diatomite to prepare the composite uncoupler for sludge reduction.
Example 5
A composite uncoupler for sludge reduction comprises 2, 4-dinitrophenol, nickel chloride and refined diatomite; wherein, the 2, 4-dinitrophenolThe weight ratio of the nickel chloride to the refined diatomite is 1:0.138:0.6259, and the specific surface area of the refined diatomite is 42m2/g。
The preparation method of the composite uncoupler for sludge reduction comprises the following steps:
(1) weighing 2, 4-dinitrophenol, nickel chloride and refined diatomite according to the proportion;
(2) preparing 2, 4-dinitrophenol into a 2, 4-dinitrophenol solution with the concentration of 8 mg/L;
(3) and uniformly mixing the 2, 4-dinitrophenol solution, nickel chloride and diatomite to prepare the composite uncoupler for sludge reduction.
Example 6
A composite uncoupler for sludge reduction comprises 2, 4-dinitrophenol, nickel chloride and refined diatomite; wherein the weight ratio of the 2, 4-dinitrophenol to the nickel chloride to the refined diatomite is 1:0.183:0.79261, and the specific surface area of the refined diatomite is 48m2/g。
The preparation method of the composite uncoupler for sludge reduction comprises the following steps:
(1) weighing 2, 4-dinitrophenol, nickel chloride and refined diatomite according to the proportion;
(2) preparing 2, 4-dinitrophenol into a 2, 4-dinitrophenol solution with the concentration of 7.5 mg/L;
(3) and uniformly mixing the 2, 4-dinitrophenol solution, nickel chloride and diatomite to prepare the composite uncoupler for sludge reduction.
Example 7
A composite uncoupler for sludge reduction comprises 2, 4-dinitrophenol, nickel chloride and refined diatomite; wherein the weight ratio of the 2, 4-dinitrophenol to the nickel chloride to the refined diatomite is 1:0.22:0.9638, and the specific surface area of the refined diatomite is 46m2/g。
The preparation method of the composite uncoupler for sludge reduction comprises the following steps:
(1) weighing 2, 4-dinitrophenol, nickel chloride and refined diatomite according to the proportion;
(2) preparing 2, 4-dinitrophenol into a 2, 4-dinitrophenol solution with the concentration of 6.5 mg/L;
(3) and uniformly mixing the 2, 4-dinitrophenol solution, nickel chloride and diatomite to prepare the composite uncoupler for sludge reduction.
Example 8
A composite uncoupler for sludge reduction comprises 2, 4-dinitrophenol, nickel chloride and refined diatomite; wherein the weight ratio of the 2, 4-dinitrophenol to the nickel chloride to the refined diatomite is 1:0.275:1.122, and the specific surface area of the refined diatomite is 35m2/g。
The preparation method of the composite uncoupler for sludge reduction comprises the following steps:
(1) weighing 2, 4-dinitrophenol, nickel chloride and refined diatomite according to the proportion;
(2) preparing 2, 4-dinitrophenol into a 2, 4-dinitrophenol solution with the concentration of 6 mg/L;
(3) and uniformly mixing the 2, 4-dinitrophenol solution, nickel chloride and diatomite to prepare the composite uncoupler for sludge reduction.
Example 9
A composite uncoupler for sludge reduction comprises 2, 4-dinitrophenol, nickel chloride and refined diatomite; wherein the weight ratio of the 2, 4-dinitrophenol to the nickel chloride to the refined diatomite is 1:0.37:1.37, and the specific surface area of the refined diatomite is 60m2/g。
The preparation method of the composite uncoupler for sludge reduction comprises the following steps:
(1) weighing 2, 4-dinitrophenol, nickel chloride and refined diatomite according to the proportion;
(2) preparing 2, 4-dinitrophenol into a 2, 4-dinitrophenol solution with the concentration of 5.5 mg/L;
(3) and uniformly mixing the 2, 4-dinitrophenol solution, nickel chloride and diatomite to prepare the composite uncoupler for sludge reduction.
Comparative example 1
A composite uncoupler for sludge reduction comprises 2, 4-dinitrophenol, and the preparation method comprises the following steps:
weighing 2, 4-dinitrophenol to prepare a 2, 4-dinitrophenol solution, wherein the concentration of the solution is 12mg/L, and the solution is the composite uncoupler for sludge reduction.
Comparative example 2
A composite uncoupler for sludge reduction comprises components of 2, 4-dinitrophenol and nickel chloride; wherein, the preparation method of the 2, 4-dinitrophenol nickel chloride with the weight ratio of 1:0.069 comprises the following steps:
(1) weighing 2, 4-dinitrophenol and nickel chloride according to the proportion;
(2) preparing 2, 4-dinitrophenol into a 2, 4-dinitrophenol solution with the concentration of 11.5 mg/L;
(3) and uniformly mixing the 2, 4-dinitrophenol solution and nickel chloride to prepare the composite uncoupler for sludge reduction.
The sewage treatment test was performed on the composite decoupling agent for sludge reduction prepared in examples 1 to 9 and comparative examples 1 to 2 by the following method:
the experimental sewage is simulated domestic sewage, and the water inlet quality is as follows:
COD：300mg/L；
TN：50～60mg/L；
TP：2～3mg/L；
PH：7.6；
the sewage is treated by Sequencing Batch Reactor (SBR) process, the volume of the reactor is 4.5L, and the operating process conditions are as follows:
sludge loading: about 0.2kgCOD/(kgMLSS d);
reaction temperature: 20-30 ℃;
dissolved oxygen: 4-6 mg/L;
in examples 1 to 9 and comparative examples 1 to 2, the amount of decoupling agent added (in terms of DNP concentration) to the wastewater and the test results are shown in Table 2:
TABLE 2
Claims (2)
1. The preparation method of the compound uncoupler for sludge reduction is characterized in that the components of the compound uncoupler are 2, 4-dinitrophenol, a nickel chloride solute and diatomite; wherein the weight ratio of the 2, 4-dinitrophenol to the nickel chloride to the diatomite is 1:0.138:0.6259, 1:0.183:0.79261 or 1:0.22: 0.9638;
the preparation method comprises the following steps:
(1) weighing 2, 4-dinitrophenol, nickel chloride and refined diatomite according to the proportion;
(2) preparing 2, 4-dinitrophenol into a 2, 4-dinitrophenol solution with the concentration of 5.5-12 mg/L;
(3) the 2, 4-dinitrophenol solution, nickel chloride and diatomite are uniformly mixed to prepare the composite uncoupler for sludge reduction, and when the composite uncoupler is specifically used for sludge reduction, the quality of treated sewage is COD: 300mg/L, TN: 50-60 mg/L, TP: 2-3 mg/L, pH: 7.6; the dosage of the uncoupler is 6.5mg/L, 7.5mg/L or 8mg/L, and the dosage is calculated by the mass of 2, 4-dinitrophenol; obtaining corresponding COD removal rate and sludge reduction rate, wherein:
when the addition amount of the uncoupler is 6.5mg/L, the COD removal rate is 87.2mg/L, and the sludge reduction rate is 52.7%;
when the addition amount of the uncoupler is 7.5mg/L, the COD removal rate is 87.3mg/L, and the sludge reduction rate is 54.6%;
when the addition amount of the uncoupler is 8mg/L, the COD removal rate is 85.8mg/L, and the sludge reduction rate is 60.4%.
2. The method for producing the composite decoupling agent for sludge reduction according to claim 1, wherein the specific surface area of the diatomite is 30 to 60m2/g。
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