CN112225394A - Method for treating and utilizing wastewater of cassava alcohol plant - Google Patents
Method for treating and utilizing wastewater of cassava alcohol plant Download PDFInfo
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Abstract
The invention provides a method for treating and utilizing wastewater of a cassava alcohol plant, which comprises the following steps: the cassava washing wastewater is recycled to the cassava washing procedure after being treated by the first water inlet grating and the first grit chamber; high-concentration production wastewater is treated by a second water inlet grid, a second grit chamber, an adjusting tank, a high-temperature anaerobic fermentation system, a flocculating agent, a solid-liquid separation device and a ferrous ion adding and medium-temperature anaerobic fermentation system, part of treated effluent is disinfected and decolored and then recycled to a powder slurry mixing process, the rest of effluent is mixed with low-concentration plant wastewater treated by a third water inlet grid and then enters a two-stage aerobic treatment system for treatment, part of treated effluent is recycled to a cassava washing process, part of treated effluent is recycled to plant miscellaneous water, the rest of effluent is treated by a membrane advanced treatment system, and clear water is recycled to a powder slurry mixing process, a circulating cooling water system water replenishing process and desalted water preparation station raw water. The invention aims to overcome the defects of the existing cassava alcohol plant production wastewater treatment technology line.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a method for treating and utilizing wastewater of a cassava alcohol plant.
Background
Under the background of energy shortage and increasingly serious environmental pollution, fuel ethanol is widely regarded as a potential energy source. In recent years, the country has greatly encouraged the development of non-food crops as raw materials to develop fuel ethanol, and in the non-food crops, the fuel ethanol produced by cassava as a raw material has obvious advantages. The bottleneck problem that the ethanol fermentation industry is restricted by factors such as low raw material utilization level, high water consumption of unit products, difficult treatment of high-concentration production wastewater such as waste mash generated in a distillation process and the like in the production process of cassava alcohol.
At present, the treatment method of high-concentration production wastewater such as waste mash in the production process of cassava alcohol mainly utilizes anaerobic fermentation to generate methane gas, and the high-BOD and high-COD waste liquid is subjected to anaerobic, aerobic and acid-base pH regulation according to the traditional process until the waste liquid finally meets the national discharge standard, so that a large amount of acid and base are consumed, secondary environmental pollution is easily caused, comprehensive utilization of the wastewater is not facilitated, industrial production is not facilitated, and production cost is not reduced.
Disclosure of Invention
The invention aims to provide a method for treating and utilizing wastewater of a cassava alcohol plant, and aims to overcome the defects of the existing technical route for treating the production wastewater of the cassava alcohol plant.
The invention is realized by the following technical scheme:
a method for treating and utilizing wastewater of a cassava alcohol plant comprises the following steps:
cassava washing wastewater is treated by a first water inlet grid and a first grit chamber to remove cassava skin and silt, and the treated water is reused in a cassava washing process;
treating the high-concentration production wastewater by a second water inlet grid and a second grit chamber to remove cassava residues and silt, and treating the high-concentration production wastewater in a high-temperature anaerobic fermentation system after passing through a regulating tank to obtain high-temperature anaerobic water outlet water;
adding a flocculating agent into the high-temperature anaerobic water effluent, and then feeding the high-temperature anaerobic water effluent into a solid-liquid separation device to remove cassava fiber residues and sludge to obtain solid-liquid separation water effluent;
adding ferrous ions into the effluent of the solid-liquid separation, and then treating the effluent in a medium-temperature anaerobic fermentation system to obtain medium-temperature anaerobic effluent;
after being disinfected and decolored, a part of medium-temperature anaerobic water effluent in the medium-temperature anaerobic water effluent is recycled to the slurry mixing process, and the rest of medium-temperature anaerobic water effluent is mixed with plant area low-concentration wastewater treated by a third water inlet grille and then enters a two-stage aerobic treatment system for treatment to obtain aerobic water effluent;
and recycling a part of aerobic water in the aerobic water effluent to a cassava washing process, recycling a part of the aerobic water effluent to miscellaneous water in a plant area, and enabling the rest of the aerobic water effluent to enter a membrane advanced treatment system for treatment to obtain advanced treatment clean water and advanced treatment wastewater, wherein the advanced treatment clean water meets the reclaimed water recycling standard and is recycled to a powder slurry mixing process, a circulating cooling water system water supplementing water and desalted water preparation station raw water.
Further, the adding concentration of ferrous ions is 10-24 mg/L.
Further, the flocculant is APAM, Ca (OH)2Wherein the adding concentration of APAM is 15mg/L, Ca (OH)2The adding concentration of the (D) is 1.5-2.0 g/L.
Further, the total amount of the medium-temperature anaerobic water effluent recycled to the powder slurry stirring process is not more than 30% of the total amount of the medium-temperature anaerobic water effluent.
Further, the two-stage aerobic treatment system sequentially adopts A2The O treatment process, the Fenton treatment process and the contact oxidation treatment process are used for treatment, or a two-stage aerobic treatment system sequentially adopts the A2The treatment process comprises an O treatment process, a Fenton treatment process and a CASS treatment process.
Further, the membrane advanced treatment system comprises a basket filter, a full-automatic multi-medium filter, an ultrafiltration device, an ultrafiltration water production tank, a nanofiltration device and a nanofiltration water production tank which are sequentially connected, wherein part of ultrafiltration water in the ultrafiltration water production tank is disinfected and then recycled to a slurry stirring process, the rest of ultrafiltration water enters the nanofiltration device for treatment, and nanofiltration water in the nanofiltration water production tank is disinfected and then recycled to a circulating cooling water system for water supplement and raw water of a desalination preparation station.
Further, the high-temperature anaerobic fermentation system and the medium-temperature anaerobic fermentation system adopt a CSTR anaerobic fermentation treatment process, a UASB anaerobic fermentation treatment process or an IC anaerobic fermentation treatment process.
Further, ferrous ions are added into the effluent of the solid-liquid separation water, and the effluent enters a medium-temperature anaerobic fermentation system for treatment after being cooled by a heat exchanger.
Compared with the prior art, the invention has the beneficial effects that:
1. part of medium-temperature anaerobic effluent obtained after the high-concentration production wastewater is treated by the high-temperature anaerobic fermentation treatment system and the medium-temperature anaerobic fermentation treatment system is disinfected and decolored and then directly recycled to the slurry mixing process, so that the water consumption of the original water source is effectively reduced, the treatment scale, the occupied area and the operation cost of the subsequent production wastewater are also effectively reduced, and the recycling of the part of medium-temperature anaerobic effluent provides rich absorbable nitrogen for the growth of the yeasts, thereby being beneficial to the metabolism and fermentation of the yeasts;
2. adding a flocculating agent before solid-liquid separation to reduce concentrations of SS, metal ions, chromaticity and the like in effluent of the solid-liquid separation, and adding ferrous ions before treatment of a medium-temperature anaerobic fermentation system to promote sulfate degradation and sulfide removal;
3. the deep treatment clean water treated by the membrane deep treatment system is recycled to the powder slurry mixing process, SO that the problems of VFA (volatile fatty acid) and SO (SO) in a fermentation system can be effectively solved4 2+And viscosity and other concentration increase to inhibit yeast fermentation, and simultaneously, the deep treatment clear water is recycled to the circulating cooling water system for supplementing water and the raw water of a demineralized water preparation station to supply water for the main water consumption process of cassava alcohol production, so that the water consumption and the energy consumption are reduced;
4. according to the requirements of each water unit on the water consumption and the water quality of a plant area and the water quantity and the water quality characteristics of wastewater discharged by each water discharge unit, the principle of plant area quality-based water supply and multi-stage utilization is taken, the utilization rate of water resources of the plant area is improved, and the water consumption and the energy consumption are reduced.
5. High-concentration production wastewater such as distilled waste liquid has the characteristic of high water temperature, and is treated by adopting a high-temperature anaerobic fermentation system, so that not only can heat energy be effectively utilized, but also the advantage of high-temperature fermentation load can be exerted, and the occupied area and energy consumption for treating the production wastewater are reduced.
Drawings
FIG. 1 is a schematic view of the process flow of the method for treating and utilizing wastewater from cassava alcohol plants.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally put in use of products of the present invention, and are only for convenience of description and simplification of description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the present invention.
Referring to fig. 1, fig. 1 is a schematic process flow diagram of the method for treating and utilizing wastewater from a cassava alcohol plant according to the present invention. In the flow of the existing production process of the cassava alcohol factory, fresh cassava is peeled by a peeling machine and then enters a cleaning machine for cleaning, the cleaned fresh cassava is crushed by a crusher and then is stirred with water to obtain cassava powder slurry, the cassava powder slurry is put into a saccharification tank for fermentation after the processes of primary preheating, a pre-liquefaction tank, jet liquefaction, post-maturation column, secondary preheating, flash evaporation cooling and the like, and then enters a distillation tower for distillation after passing through a preheater. The distilled distillation waste liquid, the distillation waste water, the waste mash and other high-concentration production waste water are recycled after being qualified. The injection liquefaction process needs a demineralized water preparation station to prepare demineralized water and generate steam in a boiler room to provide heat, and the saccharification tank, the fermentation tank and the distillation tower need a circulating cooling water system to provide cooling water.
The invention provides a method for treating and utilizing wastewater of a cassava alcohol plant, which improves the existing wastewater treatment of the cassava alcohol plant, improves the utilization rate of water resources of a plant area and reduces water consumption and energy consumption on the basis of plant area dual water supply and multi-stage utilization according to the requirements of water consumption units and water quality of the plant area and the water quantity and water quality characteristics of wastewater discharged by drainage units, and comprises the following specific processes:
recycling cassava washing water: the fresh cassava needs to be peeled by a peeling machine before being subjected to a crushing process and then enters a cleaning machine for cleaning, tap water is generally adopted as a water source for peeling and cleaning the fresh cassava, impurities of fresh cassava washing wastewater mainly contain silt and cassava peel, therefore, a first water inlet grid and a first sand settling tank are arranged near the cassava washing process, the cassava washing wastewater is treated by the first water inlet grid and the first sand settling tank to remove the cassava peel and the silt, the treated water is recycled to the cassava washing process, and part or all of the water treated by the first water inlet grid and the first sand settling tank is used for replacing the tap water, so that the consumption of the tap water is reduced, the process requirements are met, the wastewater discharge is realized, and resources are comprehensively utilized.
Recycling production wastewater: high-concentration production wastewater such as distillation waste liquid, distillation wastewater, waste mash and the like in the alcohol production process is precipitated by a second grid water inlet grid and a second grit chamber, cassava residue and silt are removed, then the cassava residue and the silt enter an adjusting tank, and the cassava residue and the silt enter a high-temperature anaerobic fermentation system for treatment after the water quantity, the water quality, the water temperature and the pH are adjusted by the adjusting tank. The high-temperature anaerobic fermentation system adopts a CSTR anaerobic fermentation treatment process, a UASB anaerobic fermentation treatment process or an IC anaerobic fermentation treatment process, preferably adopts a CSTR anaerobic fermentation treatment process, and the treatment temperature of the CSTR anaerobic fermentation treatment process is as follows: 50-55 ℃. The high-temperature anaerobic water effluent is obtained after being treated by a high-temperature anaerobic fermentation system, and the COD (chemical oxygen demand) of the high-temperature anaerobic water effluent is about 5720-6600 mg/L and BOD5(Biochemical Oxygen Demand, which is an important index for indirectly indicating the degree of water pollution by organic matters by using the dissolved Oxygen consumed by microbial metabolism) is about 2400-3500 mg/L. High-concentration production wastewater such as distillation waste liquid, distillation waste water, waste mash and the like in the alcohol production process has the characteristic of high water temperature, and a high-temperature anaerobic fermentation system is adopted for treatment, so that not only can heat energy be effectively utilized, but also the advantage of high-temperature fermentation load can be exerted, and the occupied area and energy consumption of production wastewater treatment are reduced.
Adding a flocculating agent into the effluent of the high-temperature anaerobic water, wherein the flocculating agent adopts APAM (anionic polyacrylamide) and Ca (OH)2(calcium hydroxide), wherein the adding concentration of APAM is 15mg/L, Ca (OH)2The adding concentration of the flocculant is 1.5-2.0 g/L, then the high-temperature anaerobic water effluent added with the flocculant enters a solid-liquid separation device for sludge-water separation, cassava fiber residues and sludge in the high-temperature anaerobic water effluent are removed, solid-liquid separation water effluent is obtained, the COD of the solid-liquid separation water effluent is about 4576-5280 mg/L, BOD5About 2000-3000 mg/L. The solid-liquid separation device adopts a plate-and-frame filter press. And a flocculating agent is added before solid-liquid separation, so that SS (suspended solid or suspended substance), metal ions, chromaticity and the like in the solid-liquid separation water effluent are reduced.
Ferrous ion Fe is added into the effluent of the solid-liquid separation2+Ferrous ion Fe2+The adding concentration of the iron ions is 10-24 mg/L, and then ferrous ions Fe are added2+The solid-liquid separation water effluent is cooled by a heat exchanger and then enters a medium-temperature anaerobic fermentation system for treatment. The medium-temperature anaerobic fermentation system adopts a CSTR anaerobic fermentation treatment process, a UASB anaerobic fermentation treatment process or an IC anaerobic fermentation treatment process, preferably adopts the UASB anaerobic fermentation treatment process, and the treatment temperature of the UASB anaerobic fermentation treatment process is as follows: 32 to 35 ℃. The medium-temperature anaerobic water effluent is obtained after being treated by a medium-temperature anaerobic fermentation system, the COD of the medium-temperature anaerobic water effluent is about 2750-3200 mg/L, and BOD5About 1200 to 1800 mg/L. Ferrous ions are added before the treatment of the medium-temperature anaerobic fermentation system to promote the degradation of sulfate and the removal of sulfide.
Part of the medium-temperature anaerobic water effluent is recycled to the slurry mixing process after being disinfected and decolored by ozone, preferably, the total amount of the medium-temperature anaerobic water effluent recycled to the slurry mixing process is not more than 30 percent of the total amount of the medium-temperature anaerobic water effluent, and the specific recycling proportion is according to VFA (volatile fatty acid) and SO (SO) in the slurry mixing process4 2+And viscosity and other concentration regulation factors. Part of medium-temperature anaerobic water effluent is adopted to replace a water source of a slurry mixing process, so that the water consumption of the original water source is effectively reduced, and the treatment scale, the occupied area and the operation of subsequent production wastewater are effectively reducedAnd meanwhile, the part of medium-temperature anaerobic water effluent is recycled, so that rich absorbable nitrogen is provided for the growth of the yeast, and the metabolism and fermentation of the yeast are facilitated. Mixing the other medium-temperature anaerobic effluent with plant low-concentration wastewater treated by a third water inlet grid to obtain mixed liquor, wherein the plant low-concentration wastewater is other wastewater except distilled waste liquor, distilled wastewater, waste mash and other high-concentration production wastewater, such as circulating cooling water discharge sewage, ground washing water, desalted water preparation station backwashing water and the like; the mixed liquid enters a two-stage aerobic treatment system for treatment to obtain aerobic water outlet water. Further, the two-stage aerobic treatment system sequentially adopts A2The mixed liquid is treated by an O treatment process, a Fenton treatment process and a contact oxidation treatment process, or a two-stage aerobic treatment system adopts A in sequence2And the mixed solution is treated by an O treatment process, a Fenton treatment process and a CASS treatment process. The COD of the aerobic effluent is about 40-60 mg/L, BOD5About 10 to 12.5 mg/L.
And recycling a part of aerobic water in the aerobic water effluent to a cassava washing process, and recycling a part of aerobic water effluent to plant area miscellaneous water, wherein the plant area miscellaneous water comprises plant area workshop equipment cleaning water, ground washing water, greening water and the like. And the rest of the aerobic effluent enters a membrane advanced treatment system for treatment to obtain advanced treatment clear water and advanced treatment wastewater. The water quality of the deeply processed clean water meets the reclaimed water reuse standard of 'urban sewage recycling industrial water quality' GB/T19923-2005. Further, the membrane advanced treatment system comprises a basket filter, a full-automatic multi-medium filter, an ultrafiltration device, an ultrafiltration water production tank, a nanofiltration device and a nanofiltration water production tank which are sequentially connected, aerobic water effluent is filtered by the basket filter and the full-automatic multi-medium filter and then enters the ultrafiltration device for treatment, ultrafiltration water is obtained, the ultrafiltration water flows into the ultrafiltration water production tank for storage, part of the ultrafiltration water in the ultrafiltration water production tank is disinfected and then recycled to the slurry mixing process, the rest of the ultrafiltration water in the ultrafiltration water production tank enters the nanofiltration device for treatment, the nanofiltration water is obtained, the nanofiltration water flows into the nanofiltration water production tank for storage, and the nanofiltration water in the nanofiltration water production tank is disinfected and then recycled to a circulating cooling water system and raw water of a desalination water preparation station. The deep treatment clear water treated by the membrane deep treatment system is recycled to the powder slurry mixing process, the phenomenon that yeast fermentation is inhibited due to accumulation of harmful substances and increase of viscosity in a fermentation system can be effectively solved, meanwhile, the deep treatment clear water is recycled to the circulating cooling water system and the raw water of a desalted water preparation station, partial original water sources are replaced to supply water for the main water consumption process of cassava alcohol production, and water consumption and energy consumption are reduced. The deep treatment wastewater can be used as miscellaneous water for ground washing, boiler ash cooling, dust suppression by spraying, lime pulping and the like. The method for treating and utilizing the wastewater of the cassava alcohol plant can establish a water balance diagram of the plant area according to the characteristics of water consumption and water discharge of each water unit, and realize zero discharge of the wastewater of the plant area.
Compared with the prior art, the invention has the beneficial effects that:
1. part of medium-temperature anaerobic water effluent obtained after high-concentration production wastewater is treated by the high-temperature anaerobic fermentation treatment system and the medium-temperature anaerobic fermentation treatment system is disinfected and decolored and then directly recycled to the slurry mixing process, so that the water consumption of the original water source is effectively reduced, the treatment scale, the occupied area and the operation cost of the subsequent production wastewater are effectively reduced, and the recycling of the part of medium-temperature anaerobic water effluent provides rich absorbable nitrogen for the growth of saccharomycetes, thereby being beneficial to the metabolism and fermentation of the saccharomycetes;
2. adding a flocculating agent before solid-liquid separation to reduce SS, metal ions, chromaticity and the like in the effluent of the solid-liquid separation, and adding ferrous ions before treatment in a medium-temperature anaerobic fermentation system to promote sulfate degradation and sulfide removal;
3. the deep treatment clean water treated by the membrane deep treatment system is recycled to the powder slurry mixing process, SO that the problems of VFA (volatile fatty acid) and SO (SO) in a fermentation system can be effectively solved4 2+And viscosity and other concentration increase to inhibit yeast fermentation, and simultaneously, the deep treatment clear water is recycled to the circulating cooling water system for supplementing water and the raw water of a demineralized water preparation station to supply water for the main water consumption process of cassava alcohol production, so that the water consumption and the energy consumption are reduced;
4. according to the requirements of each water unit on the water consumption and the water quality of a plant area and the water quantity and the water quality characteristics of wastewater discharged by each water discharge unit, the principle of plant area quality-based water supply and multi-stage utilization is taken, the utilization rate of water resources of the plant area is improved, and the water consumption and the energy consumption are reduced.
5. High-concentration production wastewater such as distilled waste liquid has the characteristic of high water temperature, and is treated by adopting a high-temperature anaerobic fermentation system, so that not only can heat energy be effectively utilized, but also the advantage of high-temperature fermentation load can be exerted, and the occupied area and energy consumption for treating the production wastewater are reduced.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention will still fall within the scope of the technical solution of the present invention without departing from the content of the technical solution of the present invention.
Claims (8)
1. A method for treating and utilizing wastewater of a cassava alcohol plant is characterized by comprising the following steps:
cassava washing wastewater is treated by a first water inlet grid and a first grit chamber to remove cassava skin and silt, and the treated water is reused in a cassava washing process;
treating the high-concentration production wastewater by a second water inlet grid and a second grit chamber to remove cassava residues and silt, and treating the high-concentration production wastewater in a high-temperature anaerobic fermentation system after passing through a regulating tank to obtain high-temperature anaerobic water outlet water;
adding a flocculating agent into the high-temperature anaerobic water effluent, and then feeding the high-temperature anaerobic water effluent into a solid-liquid separation device to remove cassava fiber residues and sludge to obtain solid-liquid separated water effluent;
adding ferrous ions into the solid-liquid separated water effluent, and then treating the water effluent in a medium-temperature anaerobic fermentation system to obtain medium-temperature anaerobic water effluent;
part of medium-temperature anaerobic water effluent in the medium-temperature anaerobic water effluent is recycled to the slurry mixing process after being disinfected and decolored, and the rest of medium-temperature anaerobic water effluent is mixed with plant area low-concentration wastewater treated by a third water inlet grid and then enters a two-stage aerobic treatment system for treatment to obtain aerobic water effluent;
and recycling a part of aerobic water in the aerobic water outlet to a cassava washing process, recycling a part of the aerobic water outlet to miscellaneous water in a plant area, and treating the rest of the aerobic water outlet in a membrane advanced treatment system to obtain advanced treatment clear water and advanced treatment wastewater, wherein the advanced treatment clear water meets the reclaimed water recycling standard and is recycled to a powder slurry mixing process, a circulating cooling water system water supplementing process and desalted water preparation station raw water.
2. The method for treating and utilizing the wastewater of the cassava alcohol plant according to claim 1, wherein the addition concentration of the ferrous ions is 10-24 mg/L.
3. The method for treating and utilizing the wastewater of the cassava alcohol plant according to claim 1, wherein the flocculant adopts APAM and Ca (OH)2Wherein the adding concentration of APAM is 15mg/L, Ca (OH)2The adding concentration of the (D) is 1.5-2.0 g/L.
4. The method for treating and utilizing the wastewater of the cassava alcohol plant according to claim 1, wherein the amount of the water recycled to the slurry mixing process is not more than 30% of the total amount of the effluent of the medium-temperature anaerobic water.
5. The method for treating and utilizing the wastewater of the cassava alcohol plant according to claim 1, wherein the two-stage aerobic treatment system sequentially adopts A2The O treatment process, the Fenton treatment process and the contact oxidation treatment process are used for treatment, or the two-stage aerobic treatment system sequentially adopts the A2The treatment process comprises an O treatment process, a Fenton treatment process and a CASS treatment process.
6. The cassava alcohol plant wastewater treatment and utilization method according to claim 1, wherein the membrane advanced treatment system comprises a basket filter, a full-automatic multi-media filter, an ultrafiltration device, an ultrafiltration water production tank, a nanofiltration device and a nanofiltration water production tank which are connected in sequence, wherein a part of ultrafiltration water in the ultrafiltration water production tank is sterilized and then recycled to a slurry mixing process, the rest of ultrafiltration water enters the nanofiltration device for treatment, and nanofiltration water in the nanofiltration water production tank is sterilized and then recycled to a circulating cooling water system and raw water of a demineralized water preparation station.
7. The method for treating and utilizing the wastewater of the cassava alcohol plant according to claim 1, wherein the high-temperature anaerobic fermentation system and the medium-temperature anaerobic fermentation system adopt a CSTR anaerobic fermentation treatment process, a UASB anaerobic fermentation treatment process or an IC anaerobic fermentation treatment process.
8. The method for treating and utilizing the wastewater of the cassava alcohol plant according to claim 1, wherein ferrous ions are added into the effluent of the solid-liquid separation water, and the effluent enters a medium-temperature anaerobic fermentation system for treatment after being cooled by a heat exchanger.
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