A composite agent for quickly starting an anaerobic reactor and application thereof

Abstract

The application discloses a composite medicament for quickly starting an anaerobic reactor and application thereof, and comprises a biomass carbon carrier and a trace element solution. ‑1 MnSO4·1H2O, 0.02g·L ‑1 ZnCl2, 0.005g·L ‑1 CuCl2·2H2O, 0.03g·L ‑1 CoCl2·6H2O, 0.025g·L ‑1 FeSO4·7H2O, and the solvent is deionized water; the mass percentage of the biomass carbon carrier in the trace element solution is 30-40%. The application discloses a composite medicament which is applied to an upflow anaerobic sludge bed, the reaction condition is controlled by adding the composite medicament, and the purpose of quickly starting the reactor and stably operating the reactor is achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of sewage anaerobic biological treatment, and particularly relates to a composite medicament for quickly starting an anaerobic reactor and application thereof. BACKGROUND

[0002] The anaerobic reactor is sensitive to changes in environmental conditions during operation, has a long starting time, and is unstable and unreliable in operation, and slow formation of granular sludge makes the sludge easy to be lost, thereby reducing the working efficiency.

[0003] Sewage anaerobic biological treatment has the characteristics of low energy consumption, recoverable biogas, low operation cost, and low residual sludge yield, and is widely recognized and applied in sewage treatment practices. However, at present, the anaerobic reactor is unstable and unreliable in operation, and the anaerobic digestion efficiency is low.

[0004] Therefore, there is an urgent need in the art for a method for quickly starting and stably operating an anaerobic reactor. SUMMARY

[0005] This section is intended to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, the abstract and the title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0006] In view of the above and / or problems existing in the prior art, the present application is proposed.

[0007] Therefore, the purpose of the present application is to overcome the deficiencies in the prior art and provide a composite medicament for quickly starting an anaerobic reactor.

[0008] To solve the above technical problems, the present application provides the following technical scheme: a composite medicament for quickly starting an anaerobic reactor, comprising a biomass carbon carrier and a trace element solution, wherein,

[0009] The trace element solution comprises 0.015g·L -1 MnSO4·1H2O, 0.02g·L -1 ZnCl2, 0.005g·L - 1 CuCl2·2H2O, 0.03g·L -1 CoCl2·6H2O, 0.025g·L -1 FeSO4·7H2O, and the solvent is deionized water.

[0010] The biomass carbon carrier accounts for 30-40% of the mass percentage of the trace element solution.

[0011] As a preferred scheme of the composite agent of the present application, wherein: the biomass carrier, the preparation method thereof comprises,

[0012] The surface impurities of the biomass carrier are washed with deionized water, and after drying, sterilization, and cooling under ultraviolet light, the pretreated biomass carrier is prepared;

[0013] The pretreated biomass carrier is placed in a shaking flask and mixed with wood ash and ant nest, and after oscillation treatment, centrifugation is performed to obtain a centrifugation product;

[0014] Sodium alginate is added to the centrifugation product, and after thorough mixing, a calcium chloride solution is added, and after standing, deionized water is washed and dried to obtain the biomass carbon carrier.

[0015] As a preferred scheme of the composite agent of the present application, wherein: the biomass carrier comprises a mixture of straw and rice husk prepared by mixing in a mass ratio of 1:1, and the particle size of the straw and rice husk is 2-4 mm.

[0016] As a preferred scheme of the composite agent of the present application, wherein: after drying, sterilization, wherein the sterilization temperature is 121°C, and the sterilization time is 20 min.

[0017] As a preferred scheme of the composite agent of the present application, wherein: the pretreated biomass carrier is placed in a shaking flask and mixed with wood ash and ant nest, wherein the mass ratio of the pretreated biomass carrier, wood ash, and ant nest is 2-5:1-2:1-2.

[0018] As a preferred scheme of the composite agent of the present application, wherein: after oscillation treatment, centrifugation is performed to obtain a centrifugation product, wherein the oscillation parameters are: a shaking bed at 120 r·min -1 and centrifugation parameters are: 2000 r·min -1 for 8 h, and centrifugation parameters are: 2000 r·min

[0019] As a preferred scheme of the composite agent of the present application, wherein: sodium alginate is added to the centrifugation product, and after thorough mixing, a calcium chloride solution is added, wherein the mass fraction of sodium alginate is 2-4%, the mass fraction of the calcium chloride solution is 2-4%, and the concentration of the calcium chloride solution is 2%; and after standing, deionized water is washed and dried, wherein the standing time is 12-14 h.

[0020] As a preferred scheme of the composite agent of the present application, wherein: the composite agent further comprises bentonite, wherein the bentonite content is 0.3-0.5 g / L, and the bentonite particle size is passed through a 200-mesh sieve.

[0021] Still another object of the present application is to overcome the deficiencies in the prior art and provide a preparation method of a composite medicament for quickly starting an anaerobic reactor, comprising mixing a biomass carbon carrier and a trace element solution, adding bentonite, placing on a shaker for adsorption for 4-8 hours, and drying at 30-40 DEG C for 20-24 hours to obtain the composite medicament product.

[0022] Another object of the present application is to overcome the deficiencies in the prior art and provide an application of the composite medicament in the quick starting and stable operation of an anaerobic reactor.

[0023] The present application has the following advantages:

[0024] (1) The present application discloses a composite medicament applied in an upflow anaerobic sludge bed, which controls the reaction conditions by adding the composite medicament, so as to achieve the purposes of quick starting and stable operation of the reactor.

[0025] (2) The present application provides a method for quickly starting and stably operating an anaerobic reactor by using a composite medicament, which has the advantages of improving the formation speed of granular sludge, improving the efficiency of reaction work, preventing sludge loss, enhancing microbial activity, shortening the starting time of the reactor, and being convenient to operate. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor. Among them:

[0027] Figure 1 It is a structure schematic diagram of the anaerobic reactor in the embodiment of the present application.

[0028] Figure 2 It is a running effect diagram without adding the composite medicament in the embodiment of the present application.

[0029] Figure 3 It is a running effect diagram with adding the composite medicament in the embodiment of the present application.

[0030] Figure 4 It is a particle size distribution diagram of the granular sludge in the embodiment of the present application.

[0031] Figure 5 It is a settling performance diagram of the granular sludge in the embodiment of the present application. DETAILED DESCRIPTION

[0032] In order to make the above objects, features and advantages of the present application more apparent and understandable, the following will make a detailed description of the specific embodiments of the present application in combination with the embodiment description.

[0033] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details set forth in this description. In other instances, well-known methods have not been described in detail in order not to unnecessarily obscure aspects of the present application.

[0034] Secondly, the "one embodiment" or "an embodiment" as referred to herein covers a specific implementation of features, structures or characteristics included in at least one implementation of the present application. The appearances of "in one embodiment" or "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive.

[0035] Embodiment 1

[0036] The present embodiment provides a composite agent for quickly starting an anaerobic reactor and its application, which mainly includes:

[0037] (1) Preparation of biomass carbon carrier:

[0038] The carrier surface impurities are washed with deionized water, and after drying, it is sterilized at 121℃ for 20min and cooled under ultraviolet lamp. The biomass carrier is prepared from a mixture of straw and rice husk in a mass ratio of 1:1, and the particle size of the straw and rice husk is 2-4mm.

[0039] The carrier is placed in a flask and mixed with wood ash and ant nest in a mass ratio of 5:2:1, and shaken in a shaking table at 120r·min -1 for 8h, and then centrifuged at 2000r·min -1 for 5min to obtain a centrifuged product. 2% sodium alginate is added, mixed thoroughly, and then 2% calcium chloride solution (concentration of 2%) is added. After 12h, it is washed with deionized water and dried to obtain the biomass carbon carrier.

[0040] (2) Preparation of composite agent product:

[0041] The biomass carbon carrier and trace element solution are mixed, bentonite is added, and after shaking adsorption for 4h on a shaking table, it is dried at 40℃ for 24h to obtain the composite agent product.

[0042] The trace element solution solvent is deionized water, which includes 0.015g·L -1 MnSO4·1H2O, 0.02g·L - 1 ZnCl2, 0.005g·L -1 CuCl2·2H2O, 0.03g·L -1CoCl2·6H2O and 0.025 g·L -1 FeSO4·7H2O, bentonite content 0.4 g / L, bentonite particle size over 200 mesh screen, biomass carbon carrier accounting for 30% of the mass percentage of trace element solution.

[0043] (3) Application of composite agent in rapid start-up and stable operation of anaerobic reactor:

[0044] The structural diagram of the anaerobic reactor is shown in Figure 1 , including a water distribution bucket 101, a water inlet pump 102, an external circulation pump 103, a first sampling port 104, a second sampling port 105, a third sampling port 106, a fourth sampling port 107, a gas collection hood 108, an external circulation pipe 109, a gas-liquid lifting pipe 110, a water outlet pipe 111, a backflow pipe 112, a biogas outlet 113, a gas-liquid separation chamber 114, a water suction pipe 115, a water inlet pipe 116, and a main reactor 117.

[0045] Specifically, one end of the water suction pipe 115 is detachably connected with the water inlet pipe 116 through the water distribution bucket 101, the water inlet pump 102 is installed with the main reactor 117 through the water inlet pipe 116, one end of the gas-liquid lifting pipe 110 located inside the main reactor 117 is installed with the gas collection hood 108, a filter screen is arranged on the water suction pipe 115, the biogas outlet 113 is detachably installed on the side of the gas-liquid separation chamber 114 away from the gas-liquid lifting pipe 110, the backflow pipe 112 is installed on the side of the gas-liquid separation chamber 114 close to the gas-liquid lifting pipe 110, one end of the backflow pipe 112 away from the gas-liquid separation chamber 114 is connected with the water inlet pipe 116, one end of the external circulation pipe 109 is installed on one side of the main reactor 117, and the other end of the external circulation pipe 109 is connected with the water inlet pipe 116.

[0046] Further, the main reactor 117 is made of cylindrical organic glass, with an inner diameter of 24 cm, a height of 192 cm, an effective volume of 62 L, and is equipped with ORP, pH online monitoring and temperature control devices, and the volume of the water distribution bucket 101 is 500 L.

[0047] Further, the water distribution bucket 101 provides a simulated wastewater for preparing the device to run, the wastewater in the water distribution bucket is pumped into the bottom of the reactor 117 by the water inlet pump 102, the water inlet of the reactor is discharged from the upper water outlet 111 by entering from the bottom; the wastewater and sludge are contacted at the bottom of the reactor 117, and the organic matter in the wastewater is removed by anaerobic digestion at the bottom of the reactor.

[0048] Anaerobic digestion will produce a large amount of gas, gas and water flow upward; gas upward movement in the process of being collected by the gas hood 108, the gas collected after the same reactor on the top of the biogas outlet 113 to exclude. For ease of detection of the internal conditions of the reactor, the reactor is equipped with a sufficient amount of sampling port 104, 105, 106, 107, to ensure that the reactor can be taken to each position of the water sample.

[0049] The reactor is equipped with an external circulation pump 103, in the initial stage of the reactor start due to the small amount of gas production reactor mass transfer effect is poor, can open the external circulation pump 103 to increase the reactor mass transfer effect.

[0050] Specifically, the start-up phase, sludge is added to two parallel reactors, sludge inoculation amount MLSS = 20 g·L -1 , one of the reactors added composite agents, the amount of 5% of the sludge dry weight, and the use of external circulation pump to mix the agent and sludge evenly; another reactor as a blank control without adding agents.

[0051] By controlling the water bucket 101 in the water C:N:P is 300:5:1, in which the carbon source is provided by glucose, sodium acetate and milk powder, nitrogen source is provided by urea, phosphorus source is provided by dipotassium hydrogen phosphate, water temperature is 30 ℃; reactor start-up initial COD is 6000 mg·L -1 , the pH is adjusted to 6.5-8.0 by sodium carbonate.

[0052] In the initial stage of start-up, the reactor is subjected to smothering exposure to activate microorganisms, during which the external circulation pump is opened twice a day, each time for 0.5 h, to ensure sufficient mass transfer effect, until the COD removal rate reaches 50% after the start of continuous water.

[0053] The initial reactor volume load is 3 kg·(m 3 ·d) -1 , the continuous water COD concentration is 3000 mg·L -1 , when the reactor COD removal rate reaches 70%, the reactor volume load is increased by 50% by shortening the hydraulic retention time, until the design load (composite agent reactor COD removal rate is stable to reach more than 90% load) is reached.

[0054] The seed sludge of the experiment is taken from the residual sludge after extrusion of a secondary sedimentation tank of a municipal wastewater treatment plant, with a moisture content of 82%, VSS / TSS of 0.38, washed by a sieve with a pore size of 0.58 mm, inoculated with flocculent sludge with a particle size of less than 0.58 mm, and the water used in the experiment is artificial simulated wastewater, the carbon source of the simulated wastewater is provided by glucose, sodium acetate and milk powder, the nitrogen source is provided by urea, and the phosphorus source is provided by dipotassium hydrogen phosphate, the COD:N:P ratio of the simulated wastewater is 300:5:1, the initial concentration of the influent COD is 6000 mg·L-1, and the pH is adjusted by sodium carbonate.

[0055] The results are shown in Figure 2 and Figure 3 It can be seen that the COD removal rate of the reactor with the addition of the composite medicament stably reaches more than 90% in 40 days, which is 12 days faster than the control group.

[0056] At the same time, further analysis shows that with the start-up process of the reactor, the gas production of both reactors shows an upward trend, and when the design load of 23.7 kg·(m 3 ·d) -1 ) is reached, the upward trend of the gas production of the reactor with the addition of the medicament is significantly accelerated, while the control is relatively flat.

[0057] During the entire start-up process, the COD removal rate and the gas production of the reactor with the addition of the medicament are higher than those of the control. The COD removal rate and the gas production of the reactor with the addition of the medicament reach 96% and 0.49 m 3 ·(kgCOD·d) -1 , respectively.

[0058] Example 2

[0059] Under the conditions of Example 1, the particle size distribution of the granular sludge and the settling performance of the granular sludge are analyzed, as shown in Figure 4 and Figure 5 .

[0060] It can be seen that the proportion of granular sludge in different particle size ranges in the reactor with the addition of the medicament is higher than that in the reactor without the addition of the medicament, indicating that the granulation degree of the reactor with the addition of the medicament is higher.

[0061] The settling performance of the granular sludge in the blank control reactor at the completion of the start-up shows that the settling performance of the reactor with the addition of the medicament is better.

[0062] In summary, the present application discloses a composite medicament applied in an upflow anaerobic sludge bed, which controls the reaction conditions by adding the composite medicament, so as to achieve the purpose of rapid start-up and stable operation of the reactor, while enhancing the microbial activity, shortening the start-up time of the reactor, and facilitating operation.

[0063] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced, without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A composite agent for use in the rapid start-up of an anaerobic reactor, characterized in that it comprises: The composite medicament comprises a biomass carbon carrier and a trace element solution, wherein, The trace element solution comprises 0.015 g L -1 MnS04*1 H20, 0.02 g L -1 ZnCI2, 0.005 g L -1 CuCI2*2 H20, 0.03 g L -1 CoCI2*6 H20 and 0.025 g L -1 FeS04*7 H20, solvent: deionized water; The biomass carbon carrier accounts for 30-40% of the mass percentage of the trace element solution. The preparation method of the biomass carbon carrier comprises washing the surface impurities of the biomass carrier with deionized water, drying, sterilizing, and cooling under ultraviolet light to obtain a pretreated biomass carrier. The pretreated biomass carrier is placed in a flask and mixed with wood ash and ant nests, and then subjected to oscillation treatment and centrifugation to obtain a centrifuged product, wherein the mass ratio of the pretreated biomass carrier, wood ash, and ant nests is 2-5:1-2:1-2. Sodium alginate is added to the centrifuged product, and after being mixed thoroughly, a calcium chloride solution is added, and then the product is washed with deionized water and dried to obtain the biomass carbon carrier, wherein the mass fraction of the sodium alginate is 2-4%, the mass fraction of the calcium chloride solution is 2-4%, and the product is washed with deionized water and dried after being left to stand for 12-14 h.

2. The combination agent of claim 1, wherein: The biomass carrier comprises a mixture of straw and rice husk mixed in a mass ratio of 1:1, and the particle size of the straw and rice husk is 2-4 mm.

3. The combination agent of claim 1, wherein: The drying is followed by sterilization, wherein the sterilization temperature is 121°C, and the sterilization time is 20 min.

4. The combination agent of claim 1, wherein: After the oscillation treatment, centrifugation is performed to obtain a centrifugation product, wherein the oscillation parameters are: a shaker 120 r·min -1 After oscillation for 8 h, centrifugation parameters are: 2000 r·min -1 Centrifugation is performed for 5 min.

5. The combination of any one of claims 1 to 4, wherein: The composite medicament further comprises bentonite, wherein the content of the bentonite is 0.3-0.5 g / L, and the particle size of the bentonite is passed through a 200-mesh sieve.

6. A method of preparing the combination agent according to any one of claims 1 to 5, characterized by: The composite medicament is obtained by mixing the biomass carbon carrier and the trace element solution, adding bentonite, and then oscillating adsorption for 4-8 h on a shaking bed, followed by drying at 30-40°C for 20-24 h.

7. The composite medicament of any one of claims 1-4 for use in the rapid start-up and stable operation of an anaerobic reactor.

Images