CN110386739A - A kind of aquaculture sewage sludge modularized treatment system and its treatment process - Google Patents

Abstract

The invention relates to the technical field of sewage sludge treatment, and discloses a modular treatment system for aquaculture sewage sludge, including a physical and chemical treatment module, a biological treatment module, a biogas utilization module and a sludge drying module. The physical and chemical treatment module includes a grid adjustment module pool, physicochemical tank and sedimentation tank, biological treatment module includes hydrolytic acidification reaction tank, IC reaction tank, BAF aeration tank and air flotation machine, biogas utilization module includes biogas desulfurizer, biogas generator, biogas burner and biogas slurry collection box, The sludge drying module includes a sludge thickening tank, a filter press, a drying room and a sludge incinerator; the invention also discloses a treatment process of a breeding industry sewage sludge modular treatment system. The invention occupies a small area, is convenient for installation and maintenance, and has low cost. It can selectively assemble components according to actual needs, realize resource recycling, high efficiency, energy saving and environmental protection, and greatly reduce the emission of polluting gases. Waste water was recycled.

Description

A modular treatment system for aquaculture sewage sludge and its treatment process

technical field

The invention relates to the technical field of sewage sludge treatment, in particular to a modular treatment system for aquaculture sewage sludge and a treatment process thereof.

Background technique

Aquaculture sludge is not only pollution but also a resource that we can use for urban development. Aquaculture sewage has typical "three highs" characteristics, that is, the concentration of organic matter is high, among which CODcr (chemical oxygen demand) is as high as 3000-12000 mg/l, ammonia nitrogen is as high as 800-2200 mg/l, and SS (suspended solids) exceeds the standard by dozens of times. And the color is deep, contains a large number of bacteria, and the content of organic phosphorus is also high. If it is directly discharged into farmland and lakes, it will cause serious pollution. The current livestock and poultry breeding pollution has become a major problem in my country's environmental governance.

At present, domestic and foreign sewage treatment technologies are mainly physical treatment, biological treatment and chemical treatment. The physical treatment method includes grid and solid-liquid separation, the biological treatment method includes hydrolytic acidification, anaerobic, aerobic treatment and air flotation treatment, and the chemical treatment is to add chemical substances in each treatment process to make the chemical substances and sewage Hazardous substances undergo chemical reactions and are transformed, including neutralization, oxidation, reduction, decomposition, coagulation and chemical precipitation, etc., in order to speed up the processing speed. For sludge treatment, concentration-dehydration (vacuum, pressurization, belt)-drying (direct, indirect) treatment process is generally used, and the treated mud is used for combustion, landfill and brick making.

At present, the status quo of domestic wastewater treatment is relatively chaotic, and there is no standardized treatment method. Domestic livestock and poultry manure has a single harmless treatment method, and the investment in facilities is too large, and the operating cost is too high. Although the pollution control of the biogasification project can meet the requirements of ecologicalization and reduction, it has not yet achieved the goal of harmlessness, and improper treatment of biogas slurry and biogas residue will cause secondary pollution. Therefore, it has become a top priority to develop a farming wastewater treatment mode and process that is convenient to handle, low in maintenance costs, and can be recycled and utilized in an all-round way, and it is also of great engineering practice value.

Contents of the invention

Based on the above problems, the present invention provides a modular treatment system for aquaculture sewage sludge and its treatment process. The present invention can realize the modular treatment of sewage sludge in aquaculture farms, and can recycle the sludge and sewage in the treatment process. Utilization, high processing efficiency, energy saving and environmental protection, greatly reducing the emission of polluting gases, easy installation, easy maintenance, and low maintenance costs.

In order to solve the above technical problems, the present invention provides a modular treatment system for aquaculture sewage sludge, including a physical and chemical treatment module, a biological treatment module, a biogas utilization module and a sludge drying module; the physical and chemical treatment module includes The grid adjustment tank, the materialization tank and the sedimentation tank connected in sequence, the biological treatment module includes the hydrolytic acidification reaction tank, the IC reaction tank, the BAF aeration tank and the air flotation machine connected in sequence through the pipeline, and the hydrolytic acidification reaction tank and the The sedimentation tank is communicated through pipelines; the biogas utilization module includes a biogas desulfurizer, a biogas generator, a biogas burner and a biogas slurry collection box, and the inlet of the biogas desulfurizer and the liquid inlet of the biogas slurry collection box are connected to the The IC reaction pool is connected through pipelines, and the gas inlets of the biogas generator and the biogas burner are connected with the gas outlet of the biogas desulfurizer through pipelines; the sludge drying module includes sludge thickening tanks, Filter press, drying room and sludge incinerator, the filter residue inlet of the sludge thickening tank and the filter residue outlet of the grid adjustment tank, physical and chemical tank, sedimentation tank, IC reaction tank, BAF aeration tank and air flotation machine all pass through The pipelines are connected, and the sludge incinerator is respectively connected with the sludge thickening tank and the drying room through the pipeline for transferring heat, and the sludge thickening tank and the drying room are respectively connected with the biogas combustion furnace through the pipeline for transferring heat connected.

Further, the grills in the grill adjustment pool adopt upflow grills.

Further, a return pool is also included, and both the air flotation machine and the drying room are connected with the return pool through pipelines.

In order to solve the above technical problems, the present invention also provides a treatment process of a modular sewage sludge treatment system in the aquaculture industry. First, the aquaculture sewage is added to the grid adjustment tank to remove floating and suspended solids in the sewage, and then the Sewage is discharged from the grid adjustment tank into the materialization tank and sedimentation tank in sequence for solid-liquid separation, hydrolysis and acidification reaction tank for hydrolysis and acidification treatment, IC reaction tank for anaerobic treatment, BAF aeration tank for aerobic treatment and air flotation machine for air flotation treatment, and recycle and reuse the sewage after the above treatment; discharge the filter residue discharged from the above-mentioned grid adjustment tank, physical and chemical tank, sedimentation tank, IC reaction tank, BAF aeration tank and air flotation machine into the sludge concentration The preliminary sludge dehydration treatment is carried out in the pool. The heat of the sludge thickening tank is provided by the sludge incinerator and the biogas combustion furnace. The heat in the drying room is provided by the biogas combustion furnace and the sludge incinerator. The mud cake after being treated in the drying room is transported into the sludge incinerator for incineration to generate heat, and the sewage generated after being treated in the drying room is It is transported to the backwater pool for recycling through pipelines; in addition, the biogas generated in the IC reaction pool is transported into the biogas desulfurizer, desulfurized by high-pressure water washing process, and then transported to the biogas generator for power generation and biogas combustion furnace for combustion. The biogas slurry in the IC reaction tank is discharged into the biogas slurry collection box to be used as raw material for organic fertilizer.

Further, the BAF aeration tank adopts a delayed aeration process to control dissolved oxygen, the dissolved oxygen concentration in the aeration tank is higher than 3-5 mg/L, and the dissolved oxygen concentration at the outlet of the aeration tank is controlled at 2 mg/l.

Further, the dissolved oxygen concentration in the aeration tank is controlled at 5-10 mg/L.

Further, when the BAF aeration tank treats the sewage, add dewatered activated sludge into the BAF aeration tank, and the amount of dehydrated activated sludge added is 0.5%-0.8% of the water storage capacity of the aeration tank.

Further, the hydraulic retention time of the hydrolytic acidification tank is 8-10 hours.

Further, the hydraulic retention time of the hydrolytic acidification tank is 10 hours.

Compared with the prior art, the beneficial effects of the present invention are: the present invention occupies a small area, is convenient for installation and maintenance, and has low maintenance costs, and can selectively assemble components according to the complexity of actual sludge and sewage treatment; the present invention can Realize the modular treatment of farm sewage sludge, which can recycle the sludge and sewage in the process of treatment, with high treatment efficiency, energy saving and environmental protection, greatly reducing the emission of polluting gases, and recycling waste water; The biogas produced in the anaerobic treatment stage can be used as the energy source of high-temperature steam required for sludge drying, and can also be used as fuel in the anaerobic stage after being desulfurized and purified by the high-pressure water washing process provided by this system. At the same time, it can provide electric energy for all electrical equipment in this system; in addition, the sludge drying module uses a filter press and drying dehydration treatment to control the water content of the sludge below 40%, which is easier to burn and ensures drying The mud cake is incinerated smoothly, and the dried mud cake can also be used as fertilizer, fuel or raw material for preparing sintered bricks, and the treated wastewater can also be used as flushing water and landscape water.

Description of drawings

FIG. 1 is a schematic frame diagram of a processing system provided by an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the examples and accompanying drawings. As a limitation of the present invention.

Example:

Referring to Figure 1, a modular treatment system for aquaculture sewage sludge, the treatment system includes a physical and chemical treatment module, a biological treatment module, a biogas utilization module, a sludge drying module and a return pond.

The physical and chemical treatment module includes a grid regulating tank, a physical and chemical tank and a sedimentation tank that are connected in sequence through pipelines. The aquaculture sewage flows into the grid regulating tank, physical and chemical tank and sedimentation tank in sequence. It can achieve the purpose of not easy to block and easy to clean. The grid adjustment tank is used to remove floating and suspended solids in sludge sewage, and the physical and chemical tank and sedimentation tank are used to separate solid and liquid in sewage.

The biological treatment module includes a hydrolytic acidification reaction tank, an IC reaction tank, a BAF aeration tank and an air flotation machine connected in sequence through pipelines. The hydrolytic acidification reaction tank and the sedimentation tank are connected through pipelines, and the sludge and sewage in the sedimentation tank can be collected from the sedimentation tank. It flows into the hydrolytic acidification reaction tank, and then flows into the IC reaction tank, BAF aeration tank and air flotation machine from the hydrolytic acidification reaction tank for corresponding treatment; The wastewater that reaches the standard can be used as reused water for flushing livestock houses or as landscape water.

The biogas utilization module includes a biogas desulfurizer, a biogas generator, a biogas burner and a biogas slurry collection box. Both the gas inlet of the biogas desulfurizer and the liquid inlet of the biogas slurry collection box are connected to the IC reaction pool through pipelines, and the biogas generator The air inlet of the biogas burner and the air inlet of the biogas burner are connected with the gas outlet of the biogas desulfurizer through pipelines; the biogas generated in the IC reaction tank enters the biogas desulfurizer and is desulfurized by high-pressure water washing process, and then enters the biogas generator respectively. And the biogas combustion furnace, the biogas generator uses biogas to generate electricity to power the treatment system, and the biogas combustion furnace generates heat energy for the sludge drying module by burning biogas; in addition, the biogas slurry collection box collects the biogas slurry in the IC reaction tank, Biogas slurry can be used as a raw material for organic fertilizers.

The sludge drying module includes a sludge thickening tank, a filter press, a drying room and a sludge incinerator connected in sequence, the filter residue inlet of the sludge thickening tank and the grid adjustment tank, a physicochemical tank, a sedimentation tank, an IC reaction tank, and a BAF The filter residue outlets of the aeration tank and the air flotation machine are connected through pipelines, and the sludge incinerator is respectively connected with the sludge thickening tank and the drying room through heat transfer pipelines, and the sludge thickening tank and the drying room are also connected with the biogas The combustion furnace is connected through the heat transfer pipeline, and the drying room is connected with the return pool through the drainage pipeline; the filter residue discharged from the grid adjustment tank, the physical and chemical tank, the sedimentation tank, the IC reaction tank, the BAF aeration tank and the air flotation machine are all Entering the sludge concentration tank, the hot gas in the biogas burner and sludge incinerator enters the sludge concentration tank through the heat transfer pipeline, and heats the sludge in the sludge concentration tank to reduce the sludge concentration in the sludge concentration tank. water content, so as to facilitate the later treatment of the filter press; the sludge discharged from the sludge thickening tank is processed by the filter press to obtain mud cakes, and part of the mud cakes can be transported out for aerobic composting treatment for returning to the field. Part of the mud cake enters the drying room after being perforated, and the hot gas in the biogas incinerator and sludge incinerator enters the drying room through the heat transfer pipeline, and the mud cake in the drying room is heated to make the mud biscuit, and after drying The mud cake can be used as a raw material for making bricks and fertilizers. At the same time, the partially dried mud cake can be put into the sludge incinerator for incineration to generate heat for use in the sludge thickening tank and drying room; after the sludge is dried, it can be obtained The sewage without polluting substances can be returned to the backwater pool as reused water for flushing the livestock house.

In addition to the technical features and related processes specified in the present invention, the grid adjustment tank, physical and chemical tank, sedimentation tank, hydrolysis acidification reaction tank, IC reaction tank, BAF aeration tank, air flotation machine, biogas desulfurizer, Biogas generators, biogas burners, biogas slurry collection tanks, sludge thickening tanks, filter presses, drying rooms, sludge incinerators and backwater tanks are all common wastewater treatment structures.

The present invention also provides a treatment process of a modular sewage sludge treatment system in the aquaculture industry. First, the aquaculture sewage is added to the grid adjustment tank to remove floating and suspended matter in the sewage, and then the sewage is discharged from the grid adjustment tank Sequentially discharged into the physical and chemical tank and sedimentation tank for solid-liquid separation, hydrolytic acidification reaction tank for hydrolytic acidification treatment, IC reaction tank for anaerobic treatment, BAF aeration tank for aerobic treatment and air flotation machine for air flotation treatment, and the above The treated sewage is recycled and reused; the filter residues discharged from the above-mentioned grid adjustment tank, physical and chemical tank, sedimentation tank, IC reaction tank, BAF aeration tank and air flotation machine are all discharged into the sludge thickening tank for sludge preliminary treatment. Dehydration treatment, the heat of the sludge concentration tank is provided by the sludge incinerator and biogas combustion furnace, and the sludge treated in the sludge concentration tank is transported into the filter press to make mud cakes and then transported to the drying room for drying treatment. The heat in the room is provided by the biogas combustion furnace and the sludge incinerator. The mud cake treated in the drying room is transported into the sludge incinerator for incineration to generate heat. In addition, the biogas generated in the IC reaction pool is transported to the biogas desulfurizer and desulfurized by the high-pressure water washing process, and then transported to the biogas generator for power generation and biogas combustion furnace for combustion. At the same time, the biogas in the IC reaction pool The biogas slurry is discharged into the biogas slurry collection box and used as raw material for organic fertilizer.

The above-mentioned BAF aeration tank adopts a delayed aeration process to control dissolved oxygen, and the dissolved oxygen concentration in the aeration tank is controlled to be higher than 3-5 mg/L, and the dissolved oxygen concentration in the aeration tank in this embodiment is controlled at 5-10 mg /L, the dissolved oxygen concentration at the outlet of the aeration tank is controlled at 2mg/l, after sufficient delayed aeration treatment, the activated sludge enters the stage of microbial endogenous metabolism, therefore, the amount of sludge discharge will be reduced; in BAF aeration Add dewatered activated sludge to the BAF aeration tank when the tank treats the sewage. The amount of dehydrated activated sludge added is 0.5%-0.8% of the water storage capacity of the aeration tank. Adding dehydrated activated sludge can adjust the sewage performance and increase Its adsorption creates favorable conditions for follow-up treatment and reduces the operating cost of the system; the hydraulic retention time of the hydrolytic acidification tank is 8-10 hours, and the hydraulic retention time of the hydrolytic acidification tank in the present embodiment is 10 hours. It is found through experiments , when the hydraulic retention time is 8h, the removal rate of COD in the sewage is 21% to 23%, and when the hydraulic retention time is increased to 10h, the COD removal rate can be increased to 26% to 29%. It has no obvious effect on the removal of COD. The removal of SS in the hydrolytic acidification tank is quite stable at the residence time, and the removal rate is maintained at 70% to 75%. The hydraulic retention time is selected as 10h. At this time, the pH of the hydrolytic acidification tank is stable at 6.5-6.7, the removal rate of COD is about 27%, and the removal rate of total phosphorus is 4%-6%, which improves the biodegradability of wastewater.

The above is the embodiment of the present invention. The specific parameters in the above-mentioned embodiments and the embodiments are only for clearly expressing the invention verification process, and are not used to limit the scope of patent protection of the present invention. The scope of patent protection of the present invention is still subject to its claims. Equivalent structural changes made in the description and accompanying drawings should all be included in the protection scope of the present invention.

Claims (9)

1. A modular treatment system for aquaculture sewage sludge, characterized in that it includes a physical and chemical treatment module, a biological treatment module, a biogas utilization module and a sludge drying module; Grid adjustment tank, physical and chemical tank and sedimentation tank, the biological treatment module includes hydrolytic acidification reaction tank, IC reaction tank, BAF aeration tank and air flotation machine connected in sequence through pipelines, and the hydrolytic acidification reaction tank and sedimentation tank are connected through pipes The biogas utilization module includes a biogas desulfurizer, a biogas generator, a biogas burner and a biogas slurry collection box, and both the air inlet of the biogas desulfurizer and the liquid inlet of the biogas slurry collection box pass through the IC reaction pool The pipeline is connected, and the inlet of the biogas generator and the biogas burner are connected with the gas outlet of the biogas desulfurizer through the pipeline; the sludge drying module includes a sludge thickening tank, a filter press, Drying room and sludge incinerator, the filter residue inlet of the sludge thickening tank is connected with the filter residue outlet of the grid adjustment tank, physical and chemical tank, sedimentation tank, IC reaction tank, BAF aeration tank and air flotation machine through pipelines , the sludge incinerator is respectively connected with the sludge thickening tank and the drying room through the heat transfer pipeline, and the sludge thickening tank and the drying room are respectively connected with the biogas combustion furnace through the heat transfer pipeline. 2. A modular treatment system for aquaculture sewage sludge according to claim 1, characterized in that, the grille in the grille regulating tank adopts an upflow grille. 3. The modularized treatment system for aquaculture sewage sludge according to claim 1, further comprising a backwater pool, the air flotation machine and the drying room are connected to the backwater pool through pipelines. 4. Based on the treatment process of a kind of aquaculture sewage sludge modular treatment system described in any one of claims 1-3, it is characterized in that, at first, the aquaculture sewage is added to the grid adjustment tank to remove the floating sludge in the sewage. Then the sewage is discharged from the grid adjustment tank into the materialization tank and the sedimentation tank for solid-liquid separation, the hydrolytic acidification reaction tank for hydrolytic acidification treatment, the IC reaction tank for anaerobic treatment, and the BAF aeration tank for aerobic treatment. Treatment and air flotation machine for air flotation treatment, and recycle and reuse the sewage after the above treatment; discharge from the above-mentioned grid adjustment tank, physical and chemical tank, sedimentation tank, IC reaction tank, BAF aeration tank and air flotation machine The filter residues are all discharged into the sludge thickening tank for preliminary sludge dehydration treatment. The heat of the sludge thickening tank is provided by the sludge incinerator and biogas combustion furnace, and the sludge treated in the sludge thickening tank is transported into the filter press After the mud cake is made, it is transported to the drying room for drying treatment. The heat in the drying room is provided by the biogas combustion furnace and the sludge incinerator. The mud cake treated in the drying room is transported into the sludge incinerator for incineration to generate heat. The sewage generated after the treatment in the drying room is transported to the backwater tank for recycling through pipelines; in addition, the biogas generated in the IC reaction tank is transported into the biogas desulfurizer, desulfurized by high-pressure water washing process, and then transported to the biogas generator for power generation and The biogas combustion furnace is used for combustion, and at the same time, the biogas slurry in the IC reaction tank is discharged into the biogas slurry collection box to be used as a raw material for organic fertilizers. 5. the treatment process of a kind of aquaculture sewage sludge modular treatment system according to claim 4, it is characterized in that, described BAF aeration tank adopts time-delay aeration process to control dissolved oxygen, and the dissolved oxygen in the aeration tank The concentration is higher than 3-5mg/L, and the dissolved oxygen concentration at the outlet of the aeration tank is controlled at 2mg/l. 6. The treatment process of a modular treatment system for aquaculture sewage sludge according to claim 5, wherein the dissolved oxygen concentration in the aeration tank is controlled at 5-10 mg/L. 7. the treatment process of a kind of aquaculture sewage sludge modular treatment system according to claim 4, is characterized in that, in BAF aeration tank, adds dewatered activated sludge in BAF aeration tank when sewage is processed, The added amount of dewatered activated sludge is 0.5%-0.8% of the water storage capacity of the aeration tank. 8. The treatment process of a modular treatment system for aquaculture sewage sludge according to claim 4, characterized in that the hydraulic retention time of the hydrolytic acidification tank is 8-10 hours. 9. The treatment process of a modular treatment system for aquaculture sewage sludge according to claim 8, wherein the hydraulic retention time of the hydrolytic acidification tank is 10 hours.