WO2022121308A1 - 一种飞灰水洗废水与湿法脱酸废水协同处理方法 - Google Patents
一种飞灰水洗废水与湿法脱酸废水协同处理方法 Download PDFInfo
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- fly ash
- wastewater
- washing
- water
- deacidification
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- 239000002351 wastewater Substances 0.000 title claims abstract description 57
- 239000010881 fly ash Substances 0.000 title claims abstract description 56
- 238000005406 washing Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000002195 synergetic effect Effects 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 150000003839 salts Chemical class 0.000 claims abstract description 22
- 239000002738 chelating agent Substances 0.000 claims abstract description 15
- 239000012065 filter cake Substances 0.000 claims abstract description 15
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 11
- 238000001704 evaporation Methods 0.000 claims abstract description 10
- 230000008020 evaporation Effects 0.000 claims abstract description 7
- 239000010865 sewage Substances 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 9
- 239000010802 sludge Substances 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 7
- 239000003546 flue gas Substances 0.000 claims description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 238000001556 precipitation Methods 0.000 claims description 6
- 239000006228 supernatant Substances 0.000 claims description 6
- 239000006004 Quartz sand Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000005189 flocculation Methods 0.000 claims description 3
- 230000016615 flocculation Effects 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 claims description 3
- 239000005416 organic matter Substances 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 150000003841 chloride salts Chemical class 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 5
- 238000002425 crystallisation Methods 0.000 abstract description 4
- 230000008025 crystallization Effects 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract description 4
- 238000004056 waste incineration Methods 0.000 abstract description 4
- 239000008213 purified water Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000011259 mixed solution Substances 0.000 abstract description 2
- 238000004062 sedimentation Methods 0.000 abstract 1
- 235000002639 sodium chloride Nutrition 0.000 description 19
- 239000000243 solution Substances 0.000 description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 238000005201 scrubbing Methods 0.000 description 4
- 230000009920 chelation Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 239000007832 Na2SO4 Substances 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 235000011148 calcium chloride Nutrition 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 235000011147 magnesium chloride Nutrition 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Definitions
- the invention relates to the technical field of waste incineration power generation wastewater treatment equipment, in particular to a method for synergistic treatment of fly ash washing wastewater and wet deacidification wastewater.
- Waste incineration power generation is currently the mainstream waste treatment method.
- a flue gas treatment system is configured, usually "SNCR furnace denitrification + semi-dry deacidification + dry deacidification + activated carbon injection + bag dust removal. "This combined process, this process does not produce secondary wastewater.
- the wet deacidification + SCR denitrification process outside the furnace is especially added.
- the wet deacidification system is in the form of a scrubbing tower. The flue gas enters the scrubbing tower and will react with the scrubbing liquid (30% concentration of NaOH).
- the wastewater has a high pH value, mainly NaCl and Na2SO4, and contains a small amount of NaOH.
- the coagulation, precipitation, evaporation and crystallization process is configured for desalination treatment to achieve the separation of salt and water.
- Fly ash contains a variety of heavy metals, which will pollute the environment. At present, the method of chelation is usually used for treatment. The detailed steps are as follows: 1. The weight of fly ash is 1.4-3% of chelating agent and 8-20% of water. Add the fly ash to the mixer for mixing; 2. After mixing, the fly ash is put into the ton bag through the baler; 3. After chelation, the fly ash is dried for 5-7 days, and after passing the inspection, it is pulled out of the factory and sent to the landfill for landfill. There are also a lot of soluble salts in fly ash, mainly in the form of chloride salts such as KCl, NaCl, MgCl2, ZnCl2, CaCl2, etc. The mass fraction of soluble salts is generally 15%-30%. This kind of salt has the value of resource utilization, and at the same time, the presence of high concentration of chloride salt is not conducive to the solidification and chelation of fly ash.
- the mass fraction of soluble salts is
- the present invention proposes a method for the synergistic treatment of fly ash washing wastewater and wet deacidification wastewater, wherein the chloride salts in the fly ash are extracted by washing with the fly ash, and then treated by curing with a chelating agent.
- fly ash After the fly ash is washed with water, the moisture content of the filter cake pressed by the plate and frame filter press is 40-50%. In the usual chelating method, the amount of water added to the chelating agent is 8-20%.
- the coagulation, precipitation, evaporation and crystallization process is used to separate salt and purify water.
- the evaporated salt can be sold in the market.
- the purified water is reused as supplementary water for the fly ash washing process, which not only solves the problem of salt and heavy metal enrichment in fly ash problems, and achieved the goal of waste recycling and zero discharge of wastewater.
- the technical solution adopted by the present invention to solve the technical problem is a method for synergistic treatment of fly ash washing wastewater and wet deacidification wastewater, which is characterized by comprising the following steps:
- Step 1 the washing liquid is pumped into the wet deacidification system to react with the flue gas, and the washing liquid is discharged through the deacidified waste water after circulating treatment by the circulating pump;
- step 2 fly ash and water are added into the mixer according to the ratio of 1 to 3 for stirring and mixing;
- Step 3 After stirring and mixing evenly, the filter cake is transported to the plate and frame filter press for dehydration by the pump to obtain the filter cake; then the filter cake is transported to another mixer through the screw conveyor, and the chelating agent is added for stirring, and then loaded into the baler. in ton bags;
- Step 4 The fly ash washing wastewater that is removed is transported to the deacidification wastewater tank by a pump to be mixed with the deacidification wastewater, and then transported to a sewage treatment device for flocculation, precipitation, evaporation and concentration, and the salt is extracted for reuse;
- Step 5 then add sodium carbonate, heavy metal collector, flocculant and heavy metal ions;
- Step 6 Enter the clarifier to separate the sludge from the water, the sludge enters the sludge tank, and the supernatant enters the intermediate tank;
- Step 7 The supernatant liquid enters the quartz sand and activated carbon filter for filtration, and the effluent enters the oxidation device to remove the organic matter in the water;
- Step 8 Evaporating to produce a large amount of crystalline salt, which is sequentially separated out and packed, and the evaporated water is collected and reused to the fly ash washing device.
- the wet deacidification system is a washing tower.
- the washing solution is a NaOH solution with a concentration of 25-30%.
- step 1 the washing liquid is sprayed out in the form of spray and driven into the wet deacidification system by a pump.
- the moisture content of the filter cake is about 40-50%.
- step 3 the packed big bag is allowed to stand for 5 to 7 days.
- the beneficial effects of the present invention are as follows: a method for synergistic treatment of fly ash washing wastewater and wet deacidification wastewater proposed by the present invention extracts the chloride salts in the fly ash by washing the fly ash with water, and then uses a chelating agent to solidify and treat it. Handling fly ash. It not only solves the problem of salt and heavy metal enrichment in fly ash, but also achieves the goal of waste recycling and zero discharge of wastewater.
- FIG. 1 is a schematic flow chart of a method for synergistic treatment of fly ash washing wastewater and wet deacidification wastewater.
- a method for synergistic treatment of fly ash washing wastewater and wet deacidification wastewater is characterized by comprising the following steps:
- Step 1 the washing liquid is pumped into the wet deacidification system to react with the flue gas, and the washing liquid is discharged through the deacidified waste water after circulating treatment by the circulating pump;
- step 2 fly ash and water are added into the mixer according to the ratio of 1 to 3 for stirring and mixing;
- Step 3 After stirring and mixing evenly, the filter cake is transported to the plate and frame filter press for dehydration by the pump to obtain the filter cake; then the filter cake is transported to another mixer through the screw conveyor, and the chelating agent is added for stirring, and then loaded into the baler. in ton bags;
- Step 4 The fly ash washing wastewater that is removed is transported to the deacidification wastewater tank by a pump to be mixed with the deacidification wastewater, and then transported to a sewage treatment device for flocculation, precipitation, evaporation and concentration, and the salt is extracted for reuse;
- Step 5 then add sodium carbonate, heavy metal collector, flocculant and heavy metal ions;
- Step 6 Enter the clarifier to separate the sludge from the water, the sludge enters the sludge tank, and the supernatant enters the intermediate tank;
- Step 7 The supernatant liquid enters the quartz sand and activated carbon filter for filtration, and the effluent enters the oxidation device to remove the organic matter in the water;
- Step 8 Evaporating to produce a large amount of crystalline salt, which is sequentially separated out and packed, and the evaporated water is collected and reused to the fly ash washing device.
- step 1 the wet deacidification system is a washing tower.
- the washing solution is a 25-30% concentration NaOH solution.
- step 1 the washing liquid is sprayed out in the form of spray and driven into the wet deacidification system by a pump.
- the moisture content of the filter cake is about 40-50%.
- the present invention suggests that, in step 3, the packed big bag is allowed to stand for 5 to 7 days.
- the moisture content of the filter cake pressed by the plate and frame filter press after washing the fly ash with water is 40-50%.
- the increase in the amount of water can improve the contact surface between the chelating agent and the fly ash and improve the contact efficiency, so it can significantly reduce the amount of chelating agent and fly ash.
- the generated fly ash washing wastewater is pumped into the deacidification wastewater tank, and mixed with the deacidification wastewater generated by the original wet deacidification system in the factory, because the Ph value of the two wastewaters is relatively high.
- the distilled salt can be sold in the market, and the purified water is reused as the supplementary water for the fly ash washing process, which solves the enrichment of salts and heavy metals, and also achieves the goal of recycling waste and zero discharge of wastewater.
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
一种飞灰水洗废水与湿法脱酸废水协同处理方法，通过飞灰水洗的方式提取飞灰中的氯盐，再用螯合剂固化处理的方式来处理飞灰。飞灰水洗后通过板框压滤机压出的滤饼含水率为40-50％，水量增多能提高螯合剂与飞灰的接触面，提升接触效率，因此可显著减少螯合剂用量，减少生产成本；同时产生的飞灰水洗废水通过泵打入脱酸废水池，与垃圾焚烧发电厂的湿法脱酸系统产生的脱酸废水混合，通过泵将混合液输送至污水处理设施，共同进行混凝沉淀蒸发结晶工艺进行盐的分离与水质净化，蒸出的盐可进行市场化售卖，净化后的水重新用于飞灰水洗工艺的补充水，既解决了飞灰中盐类与重金属富集问题，又实现了废物资源化与废水零排放的目标。
Description
本发明涉及垃圾焚烧发电废水处理设备技术领域，具体是一种飞灰水洗废水与湿法脱酸废水协同处理方法。
垃圾焚烧发电是目前主流的垃圾处理方式，根据各地烟气排放标准的不同，配置烟气处理系统，通常为“SNCR炉内脱硝+半干法脱酸+干法脱酸+活性炭喷射+布袋除尘”这一组合工艺，这套工艺不会产生二次废水。但由于有些地区的烟气排放标准高于国标，特别增加了湿法脱酸+SCR炉外脱硝工艺。湿法脱酸系统为洗涤塔形式，烟气进入洗涤塔会和洗涤液(30％浓度的NaOH)循环反应，一段时间后洗涤液盐分增加，需要排放，该废水即为脱酸废水。该废水PH值高，以NaCl、Na2SO4为主，含少量NaOH，配置混凝沉淀蒸发结晶工艺进行除盐处理，实现盐分和水的分离。
飞灰中含有多种重金属，会对环境造成污染，目前通常采用螯合的方式进行处理，详细步骤如下：1.将飞灰重量1.4-3％比例的螯合剂、8-20％比例的水和飞灰一起加入搅拌机内搅拌；2.搅拌后飞灰通过打包机装入吨袋中；3.螯合后飞灰晾晒5-7天，检测合格后拉出厂进入填埋场填埋。飞灰中也存在大量的易溶性盐，主要以KCl、NaCl、MgCl2、ZnCl2、CaCl2等氯盐的形式存在，易溶盐的质量分数一般为15％-30％。该类盐具有资源化的价值，同时高浓度的氯盐的存在也不利于飞灰的固化螯合。
发明内容
为解决现有技术问题，本发明提出一种飞灰水洗废水与湿法脱酸废水协同处理方法，通过飞灰水洗的方式提取飞灰中的氯盐，再用螯合剂固化处理的方式来处理飞灰。飞灰水洗后通过板框压滤机压出的滤饼含水率为40-50％，而通常的螯合方法，螯合剂加水量为8-20％，水量增多能提高螯合剂与飞灰的接触面，提升接触效率，因此可显著减少螯合剂用量，减少生产成本；同时产生的飞灰水洗废水通过泵打入脱酸废水池，与垃圾焚烧发电厂的湿法脱酸系统产生的脱酸废水混合，由于两种废水的Ph值都较高且相似(PH＝10-12),同时都含有大量盐类，因此无需考虑其他条件，通过泵将混合液输送至污水处理设施，共同进行混凝沉淀蒸发结晶工艺进行盐的分离与水质净化，蒸出的盐可进行市场化售卖，净化后的水重新用于飞灰水洗工艺的补充水，既解决了飞灰中盐类与重金属富集问题，又实现了废物资源化与废水零排放的目标。
本发明解决技术问题采用的技术方案是，一种飞灰水洗废水与湿法脱酸废水协同处理方法，其特征是，包括以下步骤：
步骤一、洗涤液通过泵打入湿法脱酸系统内与烟气进行反应，洗涤液通过循环泵循环处理后的脱酸废水进行排放；
步骤二、飞灰与水根据1比3的比例加入搅拌机内进行搅拌混合均匀；
步骤三、搅拌混合均匀后通过泵输送至板框压滤机压滤脱水得到滤饼；随后将滤饼通过螺旋输送机输送至另一搅拌机内并加入螯合剂进行搅拌，之后通过打包机装入吨袋中；
步骤四、脱出的飞灰水洗废水通过泵输送到脱酸废水池与脱酸废水混合后，再输送至污水处理装置进行絮凝沉淀蒸发浓缩，提取盐分进行再利用；
步骤五、之后加入碳酸钠、重金属捕集剂、絮凝剂与重金属离子；
步骤六、进入澄清器进行污泥与水的分离，污泥进入污泥池，上清液进入中间水池；
步骤七、上清液进入石英砂与活性炭过滤器进行过滤，出水进入氧化装置，去除水中有机物；
步骤八、蒸发产生大量结晶盐，依次析出打包，蒸发出的水收集回用至飞灰水洗装置。
优选的，在步骤一中，湿法脱酸系统为洗涤塔。
优选的，在步骤一中，洗涤液为25-30％浓度的NaOH溶液。
优选的，在步骤一中，洗涤液以喷淋形式喷出由泵打入湿法脱酸系统内。
优选的，在步骤三中，滤饼含水率约为40-50％。
优选的，在步骤三中，打包后的吨袋静置5到7天。
本发明的有益效果是：本发明提出的一种飞灰水洗废水与湿法脱酸废水协同处理方法，通过飞灰水洗的方式提取飞灰中的氯盐，再用螯合剂固化处理的方式来处理飞灰。既解决了飞灰中盐类与重金属富集问题，又实现了废物资源化与废水零排放的目标。
图1为一种飞灰水洗废水与湿法脱酸废水协同处理方法的流程示意图。
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明实施例中，一种飞灰水洗废水与湿法脱酸废水协同处理方法，其特征是，包括以下步骤：
步骤一、洗涤液通过泵打入湿法脱酸系统内与烟气进行反应，洗涤液通过循环泵循环处理后的脱酸废水进行排放；
步骤二、飞灰与水根据1比3的比例加入搅拌机内进行搅拌混合均匀；
步骤三、搅拌混合均匀后通过泵输送至板框压滤机压滤脱水得到滤饼；随后将滤饼通过螺旋输送机输送至另一搅拌机内并加入螯合剂进行搅拌，之后通过打包机装入吨袋中；
步骤四、脱出的飞灰水洗废水通过泵输送到脱酸废水池与脱酸废水混合后，再输送至污水处理装置进行絮凝沉淀蒸发浓缩，提取盐分进行再利用；
步骤五、之后加入碳酸钠、重金属捕集剂、絮凝剂与重金属离子；
步骤六、进入澄清器进行污泥与水的分离，污泥进入污泥池，上清液进入中间水池；
步骤七、上清液进入石英砂与活性炭过滤器进行过滤，出水进入氧化装置，去除水中有机物；
步骤八、蒸发产生大量结晶盐，依次析出打包，蒸发出的水收集回用至飞灰水洗装置。
本发明提示，在步骤一中，湿法脱酸系统为洗涤塔。
本发明提示，在步骤一中，洗涤液为25-30％浓度的NaOH溶液。
本发明提示，在步骤一中，洗涤液以喷淋形式喷出由泵打入湿法脱酸系统内。
本发明提示，在步骤三中，滤饼含水率约为40-50％。
本发明提示，在步骤三中，打包后的吨袋静置5到7天。
专利号为201811562206.8的技术是通过飞灰与水与螯合剂直接搅拌混合，搅拌后同样采用板框压滤机压滤，螯合后飞灰装入吨袋，水与螯合剂进行循环重新用于飞灰的搅拌混合。此类通常的螯合方法，螯合剂加水量为8-20％。与该公开的专利方案相比，
本案提出的技术，飞灰水洗后通过板框压滤机压出的滤饼含水率为40-50％，水量增多能提高螯合剂与飞灰的接触面，提升接触效率，因此可显著减少螯合剂用量，减少生产成本；同时产生的飞灰水洗废水通过泵打入脱酸废水池，与厂内原有的湿法脱酸系统产生的脱酸废水混合，由于两种废水的Ph值都较高且相似(PH＝10-12),同时都含有大量盐类，因此无需考虑其他条件，通过泵将混合液输送至污水处理设施，共同进行混凝沉淀蒸发结晶工艺进行盐的分离与水质净化，蒸出的盐可进行市场化售卖，净化后的水重新用于飞灰水洗工艺的补充水，解决了盐类与重金属富集，也实现废物资源化与废水零排放的目标。
Claims (6)
- 一种飞灰水洗废水与湿法脱酸废水协同处理方法，其特征是，包括以下步骤：步骤一、洗涤液通过泵打入湿法脱酸系统内与烟气进行反应，洗涤液通过循环泵循环处理后的脱酸废水进行排放；步骤二、飞灰与水根据1比3的比例加入搅拌机内进行搅拌混合均匀；步骤三、搅拌混合均匀后通过泵输送至板框压滤机压滤脱水得到滤饼；随后将滤饼通过螺旋输送机输送至另一搅拌机内并加入螯合剂进行搅拌，之后通过打包机装入吨袋中；步骤四、脱出的飞灰水洗废水通过泵输送到脱酸废水池与脱酸废水混合后，再输送至污水处理装置进行絮凝沉淀蒸发浓缩，提取盐分进行再利用；步骤五、之后加入碳酸钠、重金属捕集剂、絮凝剂与重金属离子；步骤六、进入澄清器进行污泥与水的分离，污泥进入污泥池，上清液进入中间水池；步骤七、上清液进入石英砂与活性炭过滤器进行过滤，出水进入氧化装置，去除水中有机物；步骤八、蒸发产生大量结晶盐，依次析出打包，蒸发出的水收集回用至飞灰水洗装置。
- 根据权利要求1所述的一种飞灰水洗废水与湿法脱酸废水协同处理方法，其特征是，在步骤一中，湿法脱酸系统为洗涤塔。
- 根据权利要求1所述的一种飞灰水洗废水与湿法脱酸废水协同处理方法，其特征是，在步骤一中，洗涤液为25-30％浓度的NaOH溶液。
- 根据权利要求1所述的一种飞灰水洗废水与湿法脱酸废水协同处理方法，其特征是，在步骤一中，洗涤液以喷淋形式喷出由泵打入湿法脱酸系统内。
- 根据权利要求1所述的一种飞灰水洗废水与湿法脱酸废水协同处理方法，其特征是，在步骤三中，滤饼含水率约为40-50％。
- 根据权利要求1所述的一种飞灰水洗废水与湿法脱酸废水协同处理方法，其特征是，在步骤三中，打包后的吨袋静置5到7天。
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| CN114871244B (zh) * | 2022-03-23 | 2024-04-09 | 上海电气集团股份有限公司 | 一种飞灰与酸性废水协同处置系统及方法 |
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