Treatment method of papermaking biochemical sludge

Abstract

The invention provides a treatment method of papermaking biochemical sludge. The treatment method comprises the following steps: obtaining biochemical sludge to be treated; preparing a mixed solution of sludge reduction bacteria and a sludge reduction bacteria compound enzyme; and adding the prepared mixed solution of the sludge reduction bacteria and the sludge reduction bacteria compound enzyme into the biochemical sludge to be treated, and reacting for a preset time. According to the treatment method, a mixed solution of sludge reduction bacteria and a sludge reduction bacteria compound enzyme is added into biochemical sludge, organic matrixes in the residual biochemical sludge are reacted in a specific environment, and after a certain retention reaction time, the organic matrixes are converted into carbon source nutrients which are extremely easy to utilize by organisms to be utilized, so that the total biomass quantity in a system is reduced, and the energy consumption of the system is reduced. At the moment, part of microorganisms and potential energy are lost in the form of heat and excrement, and finally, the yield of the biochemical residual sludge is greatly reduced; therefore, the purposes of energy conservation, emission reduction, clean production, improvement of the cyclic utilization efficiency of water resources and reduction of the production cost are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of papermaking biochemical sludge treatment, and in particular to a method for treating papermaking biochemical sludge. Background Art

[0002] As the market demand for mechanical pulp gradually increases, chemical-mechanical pulp and papermaking enterprises are faced with the challenge of breaking through production capacity and improving product quality. As the company's production scale gradually expands and pulp and paper production capacity gradually increases, the wastewater treatment load increases, and the amount of biochemical sludge generated increases accordingly. At the same time, because biochemical sludge is difficult to dewater (the dryness of the fiber and inorganic sludge in the primary sedimentation tank is about 35%-40% after spiral pressing and dehydration, and the dryness of the biochemical sludge after spiral pressing and dehydration is only about 15%-20%), the biochemical sludge is mixed with the fiber and inorganic sludge in the primary sedimentation tank for spiral pressing and dehydration, and the overall sludge dryness also drops to below 30%, and the sludge treatment volume also drops by about 25%-30%, which seriously affects the sludge treatment capacity and leads to a substantial increase in the cost of sludge solid waste treatment. If expansion is carried out, a large amount of costs such as land and equipment will be required, which is not conducive to the healthy development of enterprises and the entire industry. With the increasing requirements for environmental protection and the development of environmental biological treatment technology, while developing production, enterprises are also responding to the call of superiors to contribute to the social environmental protection responsibility. Therefore, they are also continuously increasing their investment in research and development for environmental protection, strengthening the research and development and promotion of sewage treatment technology, and striving to improve the ability and level of water environment treatment in order to achieve green and clean production, energy conservation and emission reduction.

[0003] Since the higher the organic content in biochemical sludge, the worse the dehydration performance and the higher the water content, the sludge treatment capacity has encountered a production bottleneck. The equipment uses mechanical pressure to destroy cells with low structural strength and separate free water, but the dehydration effect is limited. It is difficult to separate the water outside the cells from the water inside the cells. Therefore, sludge treatment restricts the capacity improvement of upstream workshops. The existing sludge reduction technology has the defects of incomplete nitrification and poor reduction effect of biological anaerobic digestion technology, and high equipment investment and operation costs of high-temperature and high-pressure hot water hydrolysis reduction technology. Summary of the invention

[0004] The present application provides a method for treating papermaking biochemical sludge, the method comprising:

[0005] obtaining biochemical sludge to be treated;

[0006] preparing a mixed solution of sludge reducing bacteria and sludge reducing bacteria complex enzyme;

[0007] The prepared mixed solution of sludge reducing bacteria and sludge reducing bacteria complex enzyme is added to the biochemical sludge to be treated and reacted for a preset time.

[0008] In some optional embodiments, in the mixed solution of the sludge reducing bacteria and the sludge reducing bacteria complex enzyme, the weight ratio of the sludge reducing bacteria and the sludge reducing bacteria complex enzyme is (0.5-2):1.

[0009] In some optional embodiments, in the mixed solution of the sludge reducing bacteria and the sludge reducing bacteria complex enzyme, the ratio of the sludge reducing bacteria and the sludge reducing bacteria complex enzyme is 1:1 in terms of weight.

[0010] In some optional embodiments, in the mixed solution of the sludge reducing bacteria and the sludge reducing bacteria complex enzyme, the weight ratio of the sludge reducing bacteria: the sludge reducing bacteria complex enzyme: the clean water is 1:1:(50-200).

[0011] In some optional embodiments, in the step of preparing the mixed solution of sludge reducing bacteria and sludge reducing bacteria complex enzyme, the temperature is controlled at 28-32° C. and the reaction is continued for 16-20 hours.

[0012] In some optional embodiments, the sludge reduction bacteria include, by weight: 3-5 parts of microbial cells, 2-4 parts of spores and cell nutrients, 1-3 parts of microbial carriers and bran; the sludge reduction complex enzyme includes, by weight: 3-4 parts of complex biological enzymes, 1-2 parts of microbial culture medium, 1-2 parts of microbial fermentation extract, and 2-3 parts of microbial growth factors.

[0013] In some optional embodiments, in the step of adding the prepared mixture of sludge reducing bacteria and sludge reducing bacteria complex enzyme to the biochemical sludge to be treated and reacting for a preset time, the sludge reducing bacteria and sludge reducing bacteria complex enzyme mixture is added to the biochemical sludge for multiple times, and the amount added each time gradually decreases.

[0014] In some optional embodiments, from the 1st to 9th day after the first addition of the mixed solution of sludge reducing bacteria and sludge reducing bacteria complex enzyme, the daily dosage of the mixed solution is 0.18-0.20% of the amount of sewage in the pool, and the sludge concentration is controlled at 0.25-0.40%; from the 10th to 30th day, the daily dosage of the mixed solution is 0.10-0.12% of the amount of sewage in the pool; the sludge concentration is controlled at 0.25-0.40%; from the 31st to 40th day, the daily dosage of the mixed solution is 0.07-0.09% of the amount of sewage in the pool, and the sludge concentration is controlled at 0.25-0.40%; from the 41st to 60th day, the daily dosage of the mixed solution is 0.04-0.06% of the amount of sewage in the pool, and the sludge concentration is controlled at 0.25-0.40%.

[0015] In some optional embodiments, the amount of dissolved oxygen in the control pool is 2-5 mg / L.

[0016] In some optional embodiments, in the step of adding the prepared mixed solution of sludge reducing bacteria and sludge reducing bacteria complex enzyme to the biochemical sludge to be treated and reacting for a preset time, the preset time is 3.5-4.5 hours.

[0017] The method for treating papermaking biochemical sludge provided in the embodiment of the present application adds a mixed solution of sludge reducing bacteria and sludge reducing bacteria complex enzyme to the biochemical sludge, reacts the organic matrix in the biochemical excess sludge in a specific environment, and after a certain residence reaction time, converts it into a carbon source nutrient that is extremely easy to utilize by organisms, thereby reducing the total number of organisms in the system and shifting to higher nutrients in the food chain. At this time, part of the microorganisms and potential energy are lost in the form of heat and excrement, ultimately greatly reducing the output of biochemical excess sludge; thereby achieving the goals of energy conservation and emission reduction, clean production, striving to improve the recycling efficiency of water resources, and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic flow chart of an embodiment of a method for treating papermaking biochemical sludge of the present application;

[0020] Figure 2 It is a specific process flow diagram of the method for treating papermaking biochemical sludge in this application. DETAILED DESCRIPTION

[0021] The present application is further described in detail below in conjunction with the accompanying drawings and examples. It is particularly noted that the following examples are only used to illustrate the present application, but are not intended to limit the scope of the present application. Similarly, the following examples are only some embodiments of the present application rather than all embodiments, and all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0022] The terms "first", "second", and "third" in the embodiments of the present application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second", and "third" can expressly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the embodiments of the present application, all directional indications (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. The terms "including" and "having" in the embodiments of the present application and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or components inherent to these processes, methods, products, or devices.

[0023] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0024] In order to solve the sludge treatment problem encountered in papermaking production, a new process method for reducing biochemical sludge in sewage plants is needed, which can increase the reduction of sludge in biochemical pools, thereby reducing the operating load of the sludge treatment system without increasing expansion and equipment costs, achieving a breakthrough in the production capacity of upstream workshops while not affecting the bottleneck of downstream sludge system operation, and ensuring the purpose of stable production of sewage workshops, so as to serve as a new technical process for sludge reduction in chemical pulp sewage plants. Therefore, this application is filed.

[0025] See also Figure 1 , Figure 1 1 is a flow chart of an embodiment of a method for treating papermaking biochemical sludge of the present application. The method for treating papermaking biochemical sludge in this embodiment includes but is not limited to the following steps.

[0026] Step S100, obtaining biochemical sludge to be treated.

[0027] Step S200, preparing a mixed solution of sludge reducing bacteria and sludge reducing bacteria complex enzyme.

[0028] In this step, the sludge reducing bacteria include, by weight: 3-5 parts of microbial cells, 2-4 parts of spores and cell nutrients, and 1-3 parts of microbial carriers and bran; the sludge reducing complex enzyme includes, by weight: 3-4 parts of complex biological enzymes, 1-2 parts of microbial culture medium, 1-2 parts of microbial fermentation extract, and 2-3 parts of microbial growth factors.

[0029] Optionally, in the mixed solution of sludge reducing bacteria and sludge reducing bacteria complex enzyme, the ratio of sludge reducing bacteria and sludge reducing bacteria complex enzyme is (0.5-2):1 by weight. In some embodiments, the ratio of sludge reducing bacteria and sludge reducing bacteria complex enzyme is 1:1 by weight. The sludge reducing bacteria and sludge reducing bacteria complex enzyme are mixed and activated, tamed, and enriched before being added for use.

[0030] The added sludge reduction bacteria and sludge reduction complex enzyme can be mixed in a weight ratio of 1:1, and the dilution ratio with water is: sludge reduction bacteria: sludge reduction complex enzyme: clean water = 1:1:(50-200), specifically 1:1:(100-150), such as 1:1:100, 1:1:120, 1:1:150 and other values, which are not listed here. Mixed into the activation dissolution barrel, the temperature is controlled at 28-32°C, and the air delivered by the blower is introduced to mix the liquid and provide dissolved oxygen for the microorganisms. The dissolved oxygen is controlled at 2-5mg / L. After continuous reaction for 16-20 hours, activation, acclimation, and enrichment are completed, and the activated mixed solution is obtained.

[0031] Please continue reading Figure 1 The method for treating papermaking biochemical sludge in the embodiment of the present application further includes step S300, adding the prepared mixed solution of sludge reducing bacteria and sludge reducing bacteria complex enzyme to the biochemical sludge to be treated and reacting for a preset time.

[0032] The preset reaction time is 3.5-4.5 hours. The mixed solution of sludge reducing bacteria and sludge reducing bacteria complex enzyme degrades the remaining biochemical sludge, that is, the cell structure is destroyed by enzymes, which can release water inside and outside the cells at the same time, and further decompose organic matter through microorganisms to minimize the remaining residue, reduce the amount of sludge and reduce sludge discharge, thereby achieving the purpose of reducing the operating load of sludge dehydration treatment.

[0033] The wastewater treatment of chemical-mechanical pulp and paper mills traditionally adopts the SBR (sequencing batch reactor activated sludge process) wastewater treatment process. The wastewater from the upstream chemical-mechanical pulp and papermaking workshops is removed by the screen to remove large particles of suspended matter and floating matter, and then flows into the water collection regulating tank by gravity. The water quality is homogenized, the water volume is adjusted, and the pH value is adjusted at the same time. The regulating tank is equipped with a submersible mixer to prevent the suspended matter from settling. The suspended matter is lifted to the flocculation tank through the sewage pump. PAC (PAC is the alias and abbreviation of polyaluminium chloride) and PAM (PAM is the alias and abbreviation of polyacrylamide) are added to the flocculation tank and stirred by the mixer. Mixing, under the action of the adsorption bridge of the flocculant, the fine suspended matter gathers into large suspended matter, and then flows into the primary sedimentation tank by gravity. The suspended matter completes solid-liquid separation in the primary sedimentation tank. The effluent of the primary sedimentation tank is lifted to the cooling tower by the cooling tower water inlet pump. After the sewage is cooled, it enters the SBR reaction tank. In the SBR tank, the processes of water intake, aeration reaction, sedimentation, drainage, and sludge discharge are completed. In the SBR tank, under the action of various facultative, aerobic, and anaerobic microorganisms, most of the organic matter in the sewage is decomposed into CO2 and water, and the microorganisms complete their own proliferation. The effluent of the SBR enters the shallow flotation tank for deep treatment. The flotation tank adds water purifiers and PAM to further remove suspended matter and some organic pollutants in the sewage. The effluent of the flotation tank meets the discharge standards. In the sewage treatment process, the sludge of the primary sedimentation tank and the biochemical sludge of the SBR tank are dehydrated by a screw press, and the sludge is burned as an organic fertilizer or as an auxiliary fuel for the power plant.

[0034] The increased sludge treatment operation load of the sewage workshop during the production test of the upstream workshop can easily lead to large biochemical sludge output and poor dehydration efficiency of the SBR, and the limited design capacity of the original sludge extrusion dehydration equipment. By expanding the sludge treatment production line, the investment costs of site, equipment, etc. are expensive, and the poor efficiency of mechanical dehydration equipment still exists as a bottleneck, and it is not easy to save energy and reduce emissions, clean production, and save costs. By making improvements on the basis of existing processes, the method in the embodiment of the present application adds a process for reducing the output of biochemical sludge, using microorganisms and biological enzymolysis to degrade the remaining sludge, and mixing the system sludge while providing dissolved oxygen through auxiliary aeration equipment, destroying the cell structure through enzymes, and releasing water inside and outside the cells at the same time, and further decomposing organic matter through microorganisms to minimize the remaining residue.

[0035] The purpose of the method in the embodiment of the present application is to reduce the amount of SBR biochemical sludge in the treatment of chemical-mechanical pulp and papermaking wastewater. Since the SBR biochemical sludge under high load has the characteristics of high organic content, poor dehydration performance, and high water content, the method in the embodiment of the present application adds a biochemical sludge reduction process, adds a certain amount of microbial reduction strains and auxiliary biological enzymes, and after a certain acclimation time, achieves biochemical sludge reduction and reduces biochemical sludge production, in order to achieve energy conservation and emission reduction, clean production, and strive to improve the recycling efficiency of water resources and reduce production costs. The method in the embodiment of the present application mainly combines the sludge reduction method based on lysis-hidden growth and the reduction method based on endogenous respiration and maintenance metabolism to carry out innovative research. The organic matrix in the biochemical excess sludge is mainly reacted in a specific environment through hydrolytic enzymes and microbial decomposition technology. After a certain residence reaction time, it is converted into carbon source nutrients that are extremely easy for organisms to utilize, which reduces the total number of organisms in the system and shifts to higher nutrients in the food chain. At this time, some microorganisms and potential energy are lost in the form of heat and excrement, ultimately greatly reducing the output of biochemical excess sludge.

[0036] The method for treating papermaking biochemical sludge in the embodiment of the present application mainly adds a biochemical sludge reduction process on the basis of the SBR pool treatment process, and achieves the purpose of sludge reduction, reducing sludge treatment, and improving system operation efficiency through a certain amount of sludge reduction bacteria and sludge reduction complex enzymes, as well as a certain enrichment time and aeration time of microorganisms in the SBR pool. A process for reducing biochemical sludge in a sewage plant includes two parts: one is the preparation and activation process of sludge reduction bacteria and sludge reduction bacteria complex enzyme mixed solution, and the other is the addition process of sludge reduction bacteria and sludge reduction bacteria complex enzyme mixed solution. Both parts are new processes added to this method. The two-part process method involves an SBR water inlet tank, an SBR tank, a centrifugal blower, an aerator, a decanter, a residual sludge discharge pump, a sludge mixing tank, a biochemical effluent tank, sludge reduction bacteria, sludge reduction complex enzymes, and a strain activation and taming dissolution barrel device. The preparation and addition of reagents in the process are relatively simple. When adding, you only need to open the valve, no pumping is required, and it is also easy to operate. Figure 2 , Figure 2 It is a specific process flow diagram of the method for treating papermaking biochemical sludge in this application.

[0037] The process flow and description are as follows:

[0038] Obtain the biochemical excess sludge to be treated. The pulping and papermaking wastewater flows into the water collection and regulating tank by gravity after the large particles of suspended solids and floating objects are removed by the screen. The wastewater in the regulating tank is lifted to the flocculation tank by the sewage pump. PAC (polyaluminium chloride) and PAM (polyacrylamide) are added to the flocculation tank and stirred by the mixer. Under the action of the adsorption bridge of the flocculant, the fine suspended solids are aggregated into large suspended solids and then flow into the primary sedimentation tank by gravity. The suspended solids are separated into solids and liquids in the primary sedimentation tank. The effluent of the primary sedimentation tank is lifted to the cooling tower by the cooling tower water inlet pump. After the wastewater is cooled, it enters the SBR reaction tank. The SBR tank completes the process of sequencing batch (water inlet, aeration reaction, sedimentation and sludge discharge, drainage) biochemical treatment, etc., in which only a small part of the sludge is discharged in the sludge discharge process, and the excess biochemical sludge to be treated by reduction is obtained.

[0039] In the SBR tank (biochemical treatment test tank step 9), the sequential batch process is completed, including water intake (i.e., sewage to be biochemically treated is taken in from the cooling tower), aeration reaction (to fully mix the sewage in the tank with the residual sludge, and provide dissolved oxygen for the microorganisms in the tank at the same time), sedimentation and sludge discharge (sludge and water separation, sludge accumulation and discharge treatment), drainage (supernatant sewage is deep-processed) and other processes (SBR operation conditions: water intake 15-25%, water intake 2 hours, aeration 2 hours, sedimentation 2 hours <sludge discharge 0.5-1 hour before the end of sedimentation, and decanting for 2 hours simultaneously), which is a sequential batch treatment. After the sequential batch treatment until the sludge discharge is completed, the residual biochemical sludge to be treated is obtained, and the water intake is aerated. At the same time of aeration, according to the requirements of the embodiment, the valve of the dissolving and preparing barrel (18) is opened to directly add the above-mentioned sludge reduction bacteria and sludge reduction complex enzyme activation and taming mixed solution, and the main reaction time (preset reaction time) is 3.5-4.5 hours.

[0040] Optionally, in step S300 of the embodiment of the present application, the sludge reducing bacteria and the sludge reducing bacteria complex enzyme mixture are added to the biochemical sludge multiple times, and the amount added each time gradually decreases.

[0041] In one embodiment, from the 1st to the 9th day after the first addition of the mixed solution of sludge reducing bacteria and sludge reducing bacteria complex enzyme, the daily dosage of the mixed solution is 0.18-0.20% of the sewage volume in the pool, the sludge concentration is controlled at 0.25-0.40%, the dissolved oxygen is controlled at 2-5 mg / L, and the daily sludge reduction in the biochemical pool is 1.5-3.5% of the mass of the sludge in the SBR pool. From the 10th to the 30th day, the daily dosage of the mixed solution is 0.10-0.12% of the sewage volume in the pool, the sludge concentration is controlled at 0.25-0.40%, the dissolved oxygen is controlled at 2-5 mg / L, and the daily sludge reduction in the biochemical pool is 3.5-5.5% of the mass of the sludge in the SBR pool. On the 31st to 40th day, the daily dosage of the mixed solution is 0.07-0.09% of the sewage volume in the pool, the sludge concentration is controlled at 0.25-0.40%, the dissolved oxygen is controlled at 2-5 mg / L, and the daily sludge reduction in the biochemical pool is 5.5-7.5% of the sludge mass in the SBR pool. On the 41st to 60th day, the daily dosage of the mixed solution is 0.04-0.06% of the sewage volume in the pool, the sludge concentration is controlled at 0.25-0.40%, the dissolved oxygen is controlled at 2-5 mg / L, and the daily sludge reduction in the biochemical pool is 8.5-10.5% of the sludge mass in the SBR pool.

[0042] In addition, in some other embodiments, it can also include obtaining the biochemical sludge to be biochemically treated, obtaining sludge reduction bacteria, and treating the residual biochemical sludge with the mixed liquid after the sludge reduction bacteria are activated, and the residual sludge in the system is degraded and reduced. Obtain the biochemical sludge treated with sludge reduction. Among them, the sludge reduction bacteria and the sludge reduction bacteria complex enzyme degrade and reduce the residual sludge in the SBR pool, and the steps include: reducing the discharge of residual sludge to the sludge concentration tank (10), and reducing the entry into the subsequent sludge disposal system (sludge mixing tank (11) and screw press sludge dehydration (12)), reducing the sludge treatment operation load, and achieving energy conservation, emission reduction, and clean production. It should be noted here that in the embodiments of the present application, only the steps related to the present application are described in detail. In addition, the detailed steps of the SBR sewage treatment method are within the understanding of those skilled in the art and will not be repeated here.

[0043] According to the process flow in the embodiment of the present application, the experiment was conducted, and the implementation method of treating the residual biochemical sludge with sludge reduction bacteria and sludge reduction complex enzymes is shown in the following table. The following table shows the process parameters for the biochemical sludge reduction of chemical-mechanical pulp and papermaking wastewater.

[0044]

[0045] Example 1: The dosage of sludge reduction bacteria and sludge reduction complex enzyme was 0.05% (1st to 9th day), 0.08% (10th to 30th day), 0.11% (31st to 40th day), and 0.19% (41st to 60th day), respectively. The dosage was relative to the daily water intake, that is, the dosage was relative to the amount of sewage in the pool.

[0046] Example 2: The dosage of sludge reducing bacteria and sludge reducing complex enzymes were 0.19% (1st to 9th day), 0.11% (10th to 30th day), 0.08% (31st to 40th day), and 0.05% (41st to 60th day), respectively. The addition amount was relative to the daily water inlet, that is, the addition amount was relative to the amount of sewage in the pool.

[0047] The table below shows the results of the implementation of biochemical sludge reduction in chemical-mechanical pulp and papermaking wastewater.

[0048]

[0049] It can be seen from the implementation results in the above table that the dosage of sludge reducing bacteria and complex enzyme in Example 2 decreases from 0.19% → 0.11% → 0.08 → 0.05% in sequence. According to the same process parameters of the biochemical pool, when the cycle reaches 60 days, the sludge reduction rate reaches 66.7% (compared with the comparative example), and the sludge reduction effect is obvious; while the dosage of sludge reducing bacteria and complex enzyme increases from 0.05% → 0.08% → 0.11% → 0.19% in sequence. According to the same process parameters of the biochemical pool, when the cycle reaches 60 days, the sludge reduction rate is 59.5% (compared with the comparative example), and the reduction effect is not as good as that of Example 2. Therefore, in the early stage of adding sludge reducing bacteria and complex enzyme, it is advisable to increase the dosage first and then gradually reduce the dosage, so as to shorten the enrichment period of the reducing bacteria in the biochemical pool, reduce the dosage cost and accelerate the sludge reduction, that is, Example 2 has a better effect.

[0050] The method for treating papermaking biochemical sludge in the embodiment of the present application has a simple process and is easy to operate. The process only requires the addition of a set of sludge reduction bacteria and a sludge reduction composite enzyme dissolving and mixing barrel dosing device. The organic matrix in the biochemical excess sludge is reacted and retained in a specific environment and device through hydrolytic enzyme and microbial decomposition technology, and converted into a carbon source nutrition that is extremely easy for organisms to utilize. By using enzymes to destroy the cell structure, the water inside and outside the cell can be released at the same time, and the organic matter can be further decomposed by microorganisms to minimize the remaining residue, reduce the amount of sludge and reduce sludge discharge, thereby achieving the purpose of reducing the operating load of sludge dehydration treatment. The sludge reduction rate reaches 66.7%, which improves the system operation capacity while also reducing sludge emissions, providing important guarantees for achieving energy conservation and emission reduction, clean production, and reducing production costs. At the same time, it also opens up a new technology and process method for reducing biochemical sludge in chemical-mechanical pulp and papermaking wastewater treatment.

[0051] Under the traditional process, under the premise of ensuring the normal operation of the chemical-mechanical pulp and papermaking wastewater system, while the company's pulp and paper production capacity is gradually increasing, the wastewater treatment load increases, and the amount of biochemical sludge produced increases accordingly. The original design capacity of the sludge treatment system has a bottleneck, and as the treatment capacity increases, the sludge output increases, which is not conducive to energy conservation and emission reduction, and the production and treatment costs increase by about several million yuan per year. However, by adopting this new process method, the above costs can be saved, and the comprehensive savings benefits are significant.

[0052] The method for treating papermaking biochemical sludge provided in the embodiment of the present application is to add a mixed solution of sludge reducing bacteria and sludge reducing bacteria complex enzyme to the biochemical sludge, react the organic matrix in the biochemical excess sludge in a specific environment, and after a certain residence reaction time, convert it into a carbon source nutrition that is extremely easy for the organism to utilize, so that the total number of organisms in the system is reduced, and a shift is made to higher nutrition in the food chain. At this time, part of the microorganisms and potential energy are lost in the form of heat and excrement, and the output of biochemical excess sludge is ultimately greatly reduced; thereby achieving energy conservation and emission reduction, clean production, and striving to improve the recycling efficiency of water resources and reduce production costs. Improve wastewater treatment efficiency, reduce pollutant emissions, and reduce the negative impact of pollutant emissions on the environment. At the same time, it helps to promote technological progress and industrial upgrading of sewage treatment. It meets the national strategic requirements for green and clean production, energy conservation and emission reduction, and environmental protection.

[0053] The above descriptions are only some embodiments of the present application, and do not limit the protection scope of the present application. Any equivalent device or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for treating papermaking biochemical sludge, characterized in that: The processing method comprises: obtaining biochemical sludge to be treated; preparing a mixed solution of sludge reducing bacteria and sludge reducing bacteria complex enzyme; The prepared mixed solution of sludge reducing bacteria and sludge reducing bacteria complex enzyme is added to the biochemical sludge to be treated and reacted for a preset time.

2. The processing method according to claim 1, characterized in that: In the mixed solution of the sludge reducing bacteria and the sludge reducing bacteria complex enzyme, the weight ratio of the sludge reducing bacteria and the sludge reducing bacteria complex enzyme is (0.5-2):

1.

3. The processing method according to claim 2, characterized in that: In the mixed solution of the sludge reducing bacteria and the sludge reducing bacteria complex enzyme, the sludge reducing bacteria and the sludge reducing bacteria complex enzyme are mixed in a weight ratio of 1:

1.

4. The processing method according to claim 3, characterized in that: In the mixed solution of the sludge reducing bacteria and the sludge reducing bacteria complex enzyme, the weight ratio of the sludge reducing bacteria: the sludge reducing bacteria complex enzyme: the clean water is 1:1:(50-200).

5. The processing method according to claim 4, characterized in that: In the step of preparing the mixed solution of sludge reducing bacteria and sludge reducing bacteria complex enzyme, the temperature is controlled at 28-32° C. and the reaction is continued for 16-20 hours.

6. The processing method according to claim 1, characterized in that: The sludge reduction bacteria include, by weight: 3-5 parts of microbial cells, 2-4 parts of spores and cell nutrients, and 1-3 parts of microbial carriers and bran; the sludge reduction composite enzyme includes, by weight: 3-4 parts of composite biological enzymes, 1-2 parts of microbial culture medium, 1-2 parts of microbial fermentation extract, and 2-3 parts of microbial growth factors.

7. The processing method according to claim 1, characterized in that: In the step of adding the prepared mixture of sludge reducing bacteria and sludge reducing bacteria complex enzyme to the biochemical sludge to be treated and reacting for a preset time, the sludge reducing bacteria and sludge reducing bacteria complex enzyme mixture is added to the biochemical sludge multiple times, and the amount added each time gradually decreases.

8. The processing method according to claim 7, characterized in that: From the 1st to the 9th day after the first addition of the mixed solution of sludge reducing bacteria and sludge reducing bacteria complex enzyme, the daily dosage of the mixed solution is 0.18-0.20% of the amount of sewage in the pool, and the sludge concentration is controlled at 0.25-0.40%; from the 10th to the 30th day, the daily dosage of the mixed solution is 0.10-0.12% of the amount of sewage in the pool; the sludge concentration is controlled at 0.25-0.40%; from the 31st to the 40th day, the daily dosage of the mixed solution is 0.07-0.09% of the amount of sewage in the pool, and the sludge concentration is controlled at 0.25-0.40%; from the 41st to the 60th day, the daily dosage of the mixed solution is 0.04-0.06% of the amount of sewage in the pool, and the sludge concentration is controlled at 0.25-0.40%.

9. The processing method according to claim 8, characterized in that: Control the amount of dissolved oxygen in the pool to 2-5 mg / L.

10. The processing method according to claim 1, characterized in that: In the step of adding the prepared mixed solution of sludge reducing bacteria and sludge reducing bacteria complex enzyme to the biochemical sludge to be treated and reacting for a preset time, the preset time is 3.5-4.5 hours.

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