CN112279446B - 一种tdi硝化废水的处理及资源回收系统及方法 - Google Patents
一种tdi硝化废水的处理及资源回收系统及方法 Download PDFInfo
- Publication number
- CN112279446B CN112279446B CN202011298351.7A CN202011298351A CN112279446B CN 112279446 B CN112279446 B CN 112279446B CN 202011298351 A CN202011298351 A CN 202011298351A CN 112279446 B CN112279446 B CN 112279446B
- Authority
- CN
- China
- Prior art keywords
- water
- wastewater
- tower
- nanofiltration
- cooling crystallization
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000011084 recovery Methods 0.000 title claims abstract description 14
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 14
- 230000001546 nitrifying effect Effects 0.000 title claims abstract description 11
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 title description 23
- LQNUZADURLCDLV-UHFFFAOYSA-N nitrobenzene Chemical compound [O-][N+](=O)C1=CC=CC=C1 LQNUZADURLCDLV-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000002351 wastewater Substances 0.000 claims abstract description 51
- 238000001179 sorption measurement Methods 0.000 claims abstract description 50
- 238000002425 crystallisation Methods 0.000 claims abstract description 45
- 230000008025 crystallization Effects 0.000 claims abstract description 45
- 238000001816 cooling Methods 0.000 claims abstract description 42
- 238000001728 nano-filtration Methods 0.000 claims abstract description 33
- 239000011347 resin Substances 0.000 claims abstract description 32
- 229920005989 resin Polymers 0.000 claims abstract description 32
- 238000004062 sedimentation Methods 0.000 claims abstract description 21
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 17
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000001704 evaporation Methods 0.000 claims abstract description 14
- 230000008020 evaporation Effects 0.000 claims abstract description 14
- 238000005189 flocculation Methods 0.000 claims abstract description 14
- 230000016615 flocculation Effects 0.000 claims abstract description 14
- 239000004576 sand Substances 0.000 claims abstract description 9
- 235000010344 sodium nitrate Nutrition 0.000 claims abstract description 8
- 239000004317 sodium nitrate Substances 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 85
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 23
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 239000000047 product Substances 0.000 claims description 14
- 229910002651 NO3 Inorganic materials 0.000 claims description 11
- NHNBFGGVMKEFGY-UHFFFAOYSA-N nitrate group Chemical group [N+](=O)([O-])[O-] NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
- 239000011148 porous material Substances 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 238000005273 aeration Methods 0.000 claims description 7
- 239000012043 crude product Substances 0.000 claims description 7
- 150000003839 salts Chemical class 0.000 claims description 7
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 6
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- IQUPABOKLQSFBK-UHFFFAOYSA-N 2-nitrophenol Chemical compound OC1=CC=CC=C1[N+]([O-])=O IQUPABOKLQSFBK-UHFFFAOYSA-N 0.000 claims description 5
- 239000002244 precipitate Substances 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L sulfate group Chemical group S(=O)(=O)([O-])[O-] QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 4
- 230000003851 biochemical process Effects 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 229910001018 Cast iron Inorganic materials 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 238000002076 thermal analysis method Methods 0.000 claims description 3
- 150000001450 anions Chemical class 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 150000002989 phenols Chemical class 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- VOZKAJLKRJDJLL-UHFFFAOYSA-N 2,4-diaminotoluene Chemical compound CC1=CC=C(N)C=C1N VOZKAJLKRJDJLL-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- DYSXLQBUUOPLBB-UHFFFAOYSA-N 2,3-dinitrotoluene Chemical compound CC1=CC=CC([N+]([O-])=O)=C1[N+]([O-])=O DYSXLQBUUOPLBB-UHFFFAOYSA-N 0.000 description 1
- YPAKZCPHSZUMCR-UHFFFAOYSA-N benzene;nitrobenzene Chemical compound C1=CC=CC=C1.[O-][N+](=O)C1=CC=CC=C1 YPAKZCPHSZUMCR-UHFFFAOYSA-N 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000003657 drainage water Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000008570 general process Effects 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 229910001410 inorganic ion Inorganic materials 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- -1 salt sulfate Chemical class 0.000 description 1
- NESLWCLHZZISNB-UHFFFAOYSA-M sodium phenolate Chemical compound [Na+].[O-]C1=CC=CC=C1 NESLWCLHZZISNB-UHFFFAOYSA-M 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D9/00—Nitrates of sodium, potassium or alkali metals in general
- C01D9/16—Purification
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C201/00—Preparation of esters of nitric or nitrous acid or of compounds containing nitro or nitroso groups bound to a carbon skeleton
- C07C201/06—Preparation of nitro compounds
- C07C201/16—Separation; Purification; Stabilisation; Use of additives
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
-
- 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
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- 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
- C02F1/722—Oxidation by peroxides
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F2001/5218—Crystallization
-
- 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
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Agronomy & Crop Science (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Water Treatment By Sorption (AREA)
Abstract
一种TDI硝化废水的处理及资源回收系统及方法,该系统包括依次连接的:第一冷却结晶塔、活性砂过滤器、树脂吸附塔、第二冷却结晶塔、电芬顿反应器、絮凝沉淀池、纳滤反应器、RO反渗透过滤器和蒸发结晶器。采用本发明的系统对TDI硝化废水进行处理,处理后废水COD去除率可达95%,硝基苯去除率达100%,回收的硝基苯纯度93%‑95%,可回收使用及深度提纯,蒸发结晶的硝酸钠产品含量高于98%,可用于对外销售,大大降低了废水的运行成本,且对环境没有二次污染。
Description
技术领域
本发明涉及一种化工废水处理技术领域,特别是涉及一种TDI硝化废水的处理及资源回收系统。
背景技术
TDI作为一种重要的有机化工原料和化工产品,广泛应用于染料、医药、化工等领域,TDI废水具有有机物含量高、毒性大、难生物降解、含盐量高等特点,且废水中硝基苯、酚类均已被列入“中国环境优先污染物名单”,出水排放严格控制。而近年来,医药、化工等行业的不断发展,TDI药剂大量需求,因此产生大量废水,对环境造成很大危害。
在TDI生产过程中,甲苯经硝酸硝化产生二硝基甲苯DNT,DNT加氢反应产生甲苯二胺TDA。在DNT合成过程产生中经过水洗和碱洗两个过程,分别产生黄水和红水,黄水中主要含有无机酸(硫酸和硝酸)和硝基苯,红水中主要含有酚钠盐。TDA合成过程产生的水为苯胺废水,苯胺废水中主要以甲苯二胺为主。DNT与TDA合成过程不同,产生的废水水质不同,因此采用的处理工艺不同。本发明针对TDI硝化废水中的硝基苯、酚类及硝酸盐(总氮)的进行处理和资源回收,是解决TDI硝化废水的关键。
发明内容
本发明目的是提供一种对TDI硝化废水的处理及资源回收系统及方法。
根据本发明的第一方面,提供一种TDI硝化废水的处理及资源回收系统(装置),包括:
第一冷却结晶塔,硝化黄水在调节池中经泵进入第一冷却结晶塔,在塔中进行冷却,结晶出硝基苯粗产品;
活性砂过滤器,与第一冷却结晶塔出水经泵相连,过滤掉废水中的悬浮物及颗粒杂质,提高树脂利用率及硝基苯纯度;
树脂吸附塔,与活性砂过滤器出水通过水泵相连,硝化废水在树脂吸附塔内进行树脂吸附有机物;
第二冷却结晶塔,与树脂吸附塔出水经泵相连,树脂吸附出水与硝化红水混合进入第二冷却结晶塔进行硝基酚结晶;
电芬顿反应器,与第二冷却结晶塔出水相连,进行废水中有机物的去除;
絮凝沉淀池,与电芬顿反应器出水相连,絮凝沉淀池中加入助沉剂进行沉淀处理;
纳滤反应器,与絮凝沉淀池出水相连,废水经纳滤反应器进行价态盐分离,纳滤浓水为硫酸盐废水,纳滤产水为硝酸盐废水;
RO反渗透过滤器,与纳滤产水相连,对纳滤产水进行浓缩;
蒸发结晶器,与RO反渗透过滤器浓水相连,经反渗透浓缩后的浓水在蒸发结晶器内进行蒸发结晶,得到高纯度产品硝酸钠。
优选情况下,第一冷却结晶塔前设置温度调节器,硝化黄水温度高于设定温度时,不留经第一冷却结晶塔直接进入树脂吸附塔,低于设定温度时,流经第一冷却结晶塔,硝基苯结晶部分沉淀于塔底,易于回收使用。
优选情况下,树脂吸附塔采用三级串联形式连接,运行模式为两用一备式。
具体情况下,电芬顿反应器包括溶铁区及反应区两部分,溶铁区下部设置有绝缘布水孔板,绝缘布水孔板下部壳体侧壁上设置进水口,绝缘布水孔板上设置有竖向平行的多个铸铁极板,左右两侧的极板分别连接电源箱的正负极;反应区进行双氧水曝气反应,池体下部设置布气孔管,曝气孔在管的下方开孔。
优选情况下,电芬顿反应器电源箱具有调换极板正负极的功能。
优选情况下,纳滤反应器纳滤膜孔径1-2nm,可有效截留二价以上阴离子,纳滤浓水为含有有机物的硫酸盐废水,作为生化工艺的碳源进行生化处理使用。
优选情况下,RO反渗透过滤器采用两级反渗透,反渗透膜孔径为0.0001微米,可截留绝大部分的无机离子,两级RO反渗透后浓水中硝酸盐质量浓度高于13%。
根据本发明的第二方面,提供一种利用上述苯硝基苯类废水的处理及资源回收系统进行TDI硝化废水的处理方法,包括以下步骤:
(1)硝化黄水在调节池中经泵进入第一冷却结晶塔,在塔中进行冷却,结晶出硝基苯粗产品,;
(2)废水经第一冷却结晶塔进入活性砂过滤器过滤后进入树脂吸附塔,吸附有机物,吸附运行方式为两用一备式,吸附后出水流入到下一道工序,吸附饱和树脂进行热解析回收硝基苯;
(3)经树脂吸附出水与硝化红水混合进入第二冷却结晶塔进行硝基酚结晶,出水进入下一道工序;
(4)第二冷却结晶塔出水进入电芬顿反应器进行废水中有机物去除,保证硝酸盐的纯度;
(5)电芬顿反应后出水进入絮凝沉淀池,通过加入碱调节pH值为碱性,使Fe2+、Fe3+产生沉淀,并加入助沉剂使其快速沉淀;
(6)絮凝沉淀池出水进入纳滤反应器进行纳滤分盐,纳滤浓水为含有有机物的硫酸盐废水,作为其它废水生化工艺的碳源进行生化处理使用,纳滤产水流入下一道工序;
(7)纳滤产水经两级RO反渗透浓缩,浓水进入蒸发系统,RO产水进行外排或回用;
(8)RO浓缩浓水经蒸发工艺结晶出高纯度硝酸钠产品。
其中,步骤(1)中,塔前设置温度调节器,温度高于设定温度时,不留经第一冷却结晶塔直接进入过滤器,低于设定温度时,流经第一冷却结晶塔,硝基苯结晶部分沉淀于塔底,易于回收使用。
其中,步骤(6)中,电芬顿反应器从底部均匀进水,上部溢流出水,底部均匀布置曝气孔,使废水混合均匀,电芬顿反应器极板间距为1cm。
采用本发明的TDI废水的处理及资源回收系统,能高效回收硝基苯及硝酸钠产品等,供给生产所需,大大降低了运行费用,对环境无二次污染。
附图说明
图1是根据本发明的TDI硝化废水的处理及资源回收系统的总体工艺流程图。
图2是本发明中的树脂吸附与解析工艺流程详图。
图3是本发明中的电芬顿反应器的结构示意图。
具体实施方式
下面结合附图及实施例对本发明作进一步说明。
参见图1,根据本发明的TDI硝化废水的处理及资源回收系统(装置)包括第一冷却结晶塔1、活性砂过滤器2、树脂吸附柱3、第二冷却结晶塔4、电芬顿反应器5、絮凝沉淀池6、纳滤反应器7、两级反渗透过滤器8、蒸发结晶器9。各设备之间依据压差通过管路、泵等依次连接。
TDI废水中黄水通过水泵进入第一冷却结晶塔1中,在塔中进行冷却,结晶出硝基苯粗产品,塔前设置温度调节器,温度高于设定温度时,不留经冷却塔直接进入活性砂过滤器2,低于设定温度时,流经第一冷却结晶塔1,硝基苯部分结晶沉淀于塔底,易于回收使用。
废水经第一冷却结晶塔1后经活性砂过滤器2进入树脂吸附柱3。参见详图2,树脂吸附柱3吸附硝基苯采用三级串联形式连接,运行模式为两用一备式,彻底吸附硝基苯,废水首先经过第一吸附柱3-1,第一吸附柱3-1出水进入第二吸附柱3-2吸附,确保硝基苯的吸附效率,第二吸附柱3-2吸附出水进入第二冷却结晶塔4进行冷却。当第一吸附柱3-1饱和后,切换至第二吸附柱3-2与第三吸附柱3-3串联吸附,吸附出水进入第二冷却结晶塔4。树脂吸附饱和后对树脂进行热解析处理,向饱和的第一吸附柱3-1中通入热水10(60-80℃),使硝基苯溶于热水中并随热水流出第一吸附柱3-1,将溶解硝基苯的废水回流至第一冷却结晶塔1冷却结晶析出硝基苯。第一吸附柱3-1解析后待第二吸附柱3-2饱和后进行第一吸附柱3-1和第三吸附柱3-3的吸附反应,第二吸附柱3-2解析同第一吸附柱3-1。
TDI废水中硝化黄水在经过树脂吸附柱3后与硝化红水混合进入第二冷却结晶塔4,在冷却塔内进行结晶形成硝基酚。
参见图3,电芬顿反应器5由溶铁区5-3与反应区5-8组成,具体包括壳体5-9,壳体5-9下部设置有绝缘布水孔板5-10,绝缘布水孔板5-10下部壳体侧壁上设置进水口5-2,绝缘布水孔板5-2上设置有竖向平行的多个铸铁极板5-4,图3中示出的电芬顿反应器由13块极板(即12对)组成,极板间距为1cm。左右两侧的极板5-4分别连接电源箱5-7的正负极,通过加外电源产生强还原性的Fe2+,电芬顿反应器5的电源箱5-7具有调换极板正负极的功能,在反应过程中可以间隔一定时间调换极板的正负极,避免极板单面溶铁,造成极板使用的过度浪费。另外,在每块极板上方增加塑料挡板5-5,高度30cm,高度略低于出水口5-6约3-5cm,从而能够防止极板直接连通而降低反应效率。电芬顿反应器5从底部均匀进水,上部溢流出水,出水口5-6上部增加壳体高度,避免溶铁曝气阶段产生的泡沫大量溢出。
从溶铁区5-3的出水口5-6出水进入反应区5-8,与投加的H2O2在反应区5-8中反应,通过反应区5-8池体的曝气管5-1进行均匀曝气,使双氧水与铁,有机物充分混合反应,将有机物去除。
经电芬顿反应器5出水进入絮凝沉淀池6,通过加入碱调节pH值为11左右,使Fe2+、Fe3+产生沉淀,并加入助沉剂聚丙烯酰胺(PAM)使其快速沉淀,沉泥由污泥处理间11进行污泥处理。
絮凝沉淀池6出水进入纳滤反应器7,含有少量有机物的废水在纳滤反应器7中进行分盐,将水中的硝酸盐与高价盐硫酸盐等分开,纳滤浓水为含有有机物的高价盐废水12,作为其它废水生化工艺的碳源进行生化处理使用。
纳滤产水经两级反渗透过滤器8进行硝酸盐废水浓缩处理,硝酸盐浓度至质量分数为13%-15%,RO反渗透产水可作为外排水排出或回用使用,反渗透浓水流入蒸发结晶器9进行蒸发结晶,结晶出高纯度硝酸钠产品。
本发明针对处理沧州大化聚海分公司TDI生产中产生的硝化废水中的硝基苯、硝酸盐,该废水硝基苯、酚类、硝酸盐含量高、难生物降解,处理困难,因此为降低药剂消耗量、废水及成分资源化利用,采用本发明对TDI硝化废水进行处理并资源回收利用,处理后的废水,COD去除率可达95%,硝基苯去除率达100%,回收的硝基苯纯度93%-95%,可回收使用及深度提纯,蒸发结晶的硝酸钠产品,含量高于98%,可用于对外销售,大大降低了废水的运行成本,且对环境没有二次污染。
Claims (5)
1.一种TDI硝化废水的处理及资源回收系统,其特征在于,包括:
第一冷却结晶塔,硝化黄水在调节池中经泵进入第一冷却结晶塔,在塔中进行冷却,结晶出硝基苯粗产品;
活性砂过滤器,与第一冷却结晶塔出水经泵相连,过滤掉废水中的悬浮物及颗粒杂质;
树脂吸附塔,与活性砂过滤器出水通过水泵相连,硝化废水在树脂吸附塔内进行树脂吸附有机物;树脂吸附塔采用三级串联形式连接,运行模式为两用一备式;
第二冷却结晶塔,与树脂吸附塔出水经泵相连,树脂吸附出水与硝化红水混合进入第二冷却结晶塔进行硝基酚结晶;
电芬顿反应器,与第二冷却结晶塔出水相连,进行废水中有机物的去除;
絮凝沉淀池,与电芬顿反应器出水相连,絮凝沉淀池中加入助沉剂进行沉淀除泥;
纳滤反应器,与絮凝沉淀池出水相连,废水经纳滤反应器进行价态盐分离,纳滤浓水为硫酸盐废水,纳滤产水为硝酸盐废水;纳滤反应器纳滤膜孔径1-2nm,有效截留二价以上阴离子;
RO反渗透过滤器,与纳滤产水相连,对纳滤产水进行浓缩;
蒸发结晶器,与RO反渗透过滤器浓水相连,经反渗透浓缩后的浓水在蒸发结晶器内进行蒸发结晶,得到高纯度产品硝酸钠。
2.根据权利要求1所述的TDI硝化废水的处理及资源回收系统,其特征在于,第一冷却结晶塔前设置温度调节器,硝化黄水温度高于设定温度时,不留经第一冷却结晶塔直接进入树脂吸附塔,低于设定温度时,流经第一冷却结晶塔,硝基苯结晶部分沉淀于塔底,易于回收使用。
3.根据权利要求1所述的TDI硝化废水的处理及资源回收系统,其特征在于,电芬顿反应器包括溶铁区及反应区两部分,溶铁区下部设置有绝缘布水孔板,绝缘布水孔板下部壳体侧壁上设置进水口,绝缘布水孔板上设置有竖向平行的多个铸铁极板,左右两侧的极板分别连接电源箱的正负极;反应区进行双氧水曝气反应,池体下部设置布气孔管,曝气孔在管的下方开孔。
4.根据权利要求3所述的TDI硝化废水的处理及资源回收系统,其特征在于,电芬顿反应器的电源箱具有调换极板正负极的功能。
5.一种采用权利要求1-4之一所述的TDI硝化废水的处理及资源回收系统进行TDI硝化废水的处理方法,包括以下步骤:
(1)硝化黄水在调节池中经泵进入第一冷却结晶塔,在塔中进行冷却,结晶出硝基苯粗产品;
(2)废水经第一冷却结晶塔进入活性砂过滤器过滤后进入树脂吸附塔,吸附有机物,吸附运行方式为两用一备式,吸附后出水流入到下一道工序,吸附饱和树脂进行热解析回收硝基苯;
(3)经树脂吸附出水与硝化红水混合进入第二冷却结晶塔进行硝基酚结晶,出水进入下一道工序;
(4)第二冷却结晶塔出水进入电芬顿反应器进行废水中有机物去除,保证硝酸盐的纯度;
(5)电芬顿反应后出水进入絮凝沉淀池,通过加入碱调节pH值为碱性,使Fe2+、Fe3+产生沉淀,并加入助沉剂使其快速沉淀;
(6)絮凝沉淀池出水进入纳滤反应器进行纳滤分盐,纳滤浓水为含有有机物的硫酸盐废水,作为其它废水生化工艺的碳源进行生化处理使用,纳滤产水流入下一道工序;
(7)纳滤产水经两级RO反渗透浓缩,浓水进入蒸发系统,RO产水进行外排或回用;
(8)RO浓缩浓水经蒸发工艺结晶出高纯度硝酸钠产品。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202011298351.7A CN112279446B (zh) | 2020-11-19 | 2020-11-19 | 一种tdi硝化废水的处理及资源回收系统及方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202011298351.7A CN112279446B (zh) | 2020-11-19 | 2020-11-19 | 一种tdi硝化废水的处理及资源回收系统及方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN112279446A CN112279446A (zh) | 2021-01-29 |
CN112279446B true CN112279446B (zh) | 2024-04-05 |
Family
ID=74398736
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202011298351.7A Active CN112279446B (zh) | 2020-11-19 | 2020-11-19 | 一种tdi硝化废水的处理及资源回收系统及方法 |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN112279446B (zh) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116462380A (zh) * | 2023-06-20 | 2023-07-21 | 世韩(天津)节能环保科技有限公司 | 一种催化剂废水处理系统 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN207002495U (zh) * | 2017-03-31 | 2018-02-13 | 中国神华能源股份有限公司 | 脱硫废水的处理系统 |
CN109704516A (zh) * | 2019-01-25 | 2019-05-03 | 河北丰源环保科技股份有限公司 | 一种苯胺类废水的处理系统及处理方法 |
CN213865794U (zh) * | 2020-11-19 | 2021-08-03 | 河北丰源环保科技股份有限公司 | 一种tdi硝化废水的处理及资源回收系统 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
PL2295375T3 (pl) * | 2009-09-15 | 2016-10-31 | Sposób i urządzenie do obróbki odpadowych kwasów siarkowych z procesu nitrowania |
-
2020
- 2020-11-19 CN CN202011298351.7A patent/CN112279446B/zh active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN207002495U (zh) * | 2017-03-31 | 2018-02-13 | 中国神华能源股份有限公司 | 脱硫废水的处理系统 |
CN109704516A (zh) * | 2019-01-25 | 2019-05-03 | 河北丰源环保科技股份有限公司 | 一种苯胺类废水的处理系统及处理方法 |
CN213865794U (zh) * | 2020-11-19 | 2021-08-03 | 河北丰源环保科技股份有限公司 | 一种tdi硝化废水的处理及资源回收系统 |
Non-Patent Citations (2)
Title |
---|
夏晨娇 ; 周宗远 ; 李汉雄 ; 何锐 ; .甲苯二异氰酸酯(TDI)生产废水处理工程实例.中国给水排水.2016,第104-107页. * |
王振川,赵仁兴,胡志鲜,白天雄,李洪波,吴磊.吸附法处理甲苯二异氰酸酯(TDI)硝化碱洗废水的研究.离子交换与吸附.2003,第139-146页. * |
Also Published As
Publication number | Publication date |
---|---|
CN112279446A (zh) | 2021-01-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN114314988B (zh) | 一种磷酸铁废水的处理和盐回收系统及其方法 | |
CN105189370A (zh) | 从废水中生物除氮的方法 | |
CN104058548A (zh) | 一种不锈钢冷轧酸性废水脱氮除盐回用工艺 | |
KR20170009155A (ko) | 고농도 질소 함유 반류수의 질소제거 시스템 | |
CN112279446B (zh) | 一种tdi硝化废水的处理及资源回收系统及方法 | |
CN111377558A (zh) | 一种同步处理Fenton铁泥并获得FePO4的资源化利用方法 | |
CN111807589A (zh) | 一种煤化工高氨氮废水回收高品位氯化铵的方法 | |
CN213865794U (zh) | 一种tdi硝化废水的处理及资源回收系统 | |
CN111875180A (zh) | 煤化工废水零排放集成处理系统及方法 | |
CN109704516B (zh) | 一种苯胺类废水的处理系统及处理方法 | |
CN111732287A (zh) | 一种高盐度重金属难降解页岩气开采废水处理系统和处理方法 | |
CN216584613U (zh) | 一种磷酸铁废水的处理和盐回收系统 | |
CN115124183B (zh) | 一种己内酰胺废水处理系统及其方法 | |
CN113087296B (zh) | 一种硝基氯苯废水的处理方法 | |
CN214457507U (zh) | 一种焦油深加工废水回用处理系统 | |
CN113061759A (zh) | 一种高氨氮高盐废水治理及资源回收的装置及治理方法 | |
CN114890614A (zh) | 一种新型垃圾渗滤液处理系统及其处理工艺 | |
CN108059304B (zh) | 恒温供水装置 | |
CN107188378A (zh) | 吡唑酮生产废水处理装置及其处理工艺 | |
CN107324612B (zh) | 醋酸纤维生产废水资源化回收方法及其回收系统 | |
CN116282688B (zh) | 一种尿素水解废水资源化处理系统及方法 | |
TWI748547B (zh) | 一種用於氣態膜法處理含氨廢水或料液的新型吸收劑 | |
CN113880314B (zh) | 从氨氮废水中获取氨水的处理方法和处理系统 | |
CN217498987U (zh) | 一种高浓度有机盐废水资源化处理系统 | |
CN113698043B (zh) | 一种原料药生产工艺废水的资源化利用及深度处理方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
CB02 | Change of applicant information | ||
CB02 | Change of applicant information |
Country or region after: Zhong Guo Address after: 010000 West Wanda Sales Center, Genghis Khan West Street, Huimin District, Hohhot City, Inner Mongolia Autonomous Region Applicant after: Antai Fengyuan Environmental Protection Technology (Inner Mongolia) Group Co.,Ltd. Address before: 061000 south of No.1 Road, Zhongjie Industrial Park, Cangzhou City, Hebei Province Applicant before: HEBEI FENGYUAN GREEN TECHNOLOGY Inc. Country or region before: Zhong Guo |
|
GR01 | Patent grant | ||
GR01 | Patent grant |