CN1319879C - Electrolytic aluminium factory production waste water disposal method - Google Patents
Electrolytic aluminium factory production waste water disposal method Download PDFInfo
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- CN1319879C CN1319879C CNB2004101554044A CN200410155404A CN1319879C CN 1319879 C CN1319879 C CN 1319879C CN B2004101554044 A CNB2004101554044 A CN B2004101554044A CN 200410155404 A CN200410155404 A CN 200410155404A CN 1319879 C CN1319879 C CN 1319879C
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- 239000002351 wastewater Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 18
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 239000004411 aluminium Substances 0.000 title claims 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000001179 sorption measurement Methods 0.000 claims abstract description 15
- 238000005188 flotation Methods 0.000 claims abstract description 11
- 238000005189 flocculation Methods 0.000 claims abstract description 6
- 238000004062 sedimentation Methods 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 239000003814 drug Substances 0.000 claims abstract description 3
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 7
- 239000010802 sludge Substances 0.000 claims description 5
- 230000016615 flocculation Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 3
- 229940037003 alum Drugs 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 230000002745 absorbent Effects 0.000 claims 3
- 239000002250 absorbent Substances 0.000 claims 3
- 239000003610 charcoal Substances 0.000 claims 3
- 239000000203 mixture Substances 0.000 claims 2
- 239000007764 o/w emulsion Substances 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 23
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 2
- 241000196324 Embryophyta Species 0.000 description 12
- 239000000428 dust Substances 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 5
- 231100000719 pollutant Toxicity 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 238000004065 wastewater treatment Methods 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 238000011001 backwashing Methods 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 241001083514 Gayophytum Species 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000004673 fluoride salts Chemical class 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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- Water Treatment By Sorption (AREA)
Abstract
本发明公开了一种电解铝厂生产废水的处理方法，它将生产废水及部分雨水经调节池水质、水量调节和预沉后提升，通过流量计和管道混合器加药，进入微絮凝槽进行混合反应，然后流入到气浮池中除去轻质油、乳化油和悬浮物，再经过滤器进一步过滤处理后，进入到活性炭吸附罐中进行吸附深化处理，以去除色度和降低COD成份，并辅助处理氟化物，最后将其流入到回收池中以便生产重复使用或者直接排放。各装置连接自动控制装置，实现自动加药、处理过程自动控制。本发明集加药系统、混合反应、气浮、过滤、活性炭吸附和自动控制为一体，具有占地面积小、组合性强、操作简单方便、适应性强、效果稳定等特点。
The invention discloses a treatment method for the production wastewater of an electrolytic aluminum plant. The production wastewater and part of the rainwater are lifted after the water quality and water volume adjustment and pre-sedimentation of the adjustment pool, and the medicine is added through the flow meter and the pipeline mixer, and then enter the micro-flocculation tank for treatment. Mixed reaction, then flow into the air flotation tank to remove light oil, emulsified oil and suspended matter, and then go through the filter for further filtration treatment, then enter the activated carbon adsorption tank for adsorption deepening treatment to remove chroma and reduce COD components, and assist The fluoride is processed and finally flows into the recovery pond for reuse in production or direct discharge. Each device is connected with an automatic control device to realize automatic dosing and automatic control of the treatment process. The invention integrates the dosing system, mixed reaction, air flotation, filtration, activated carbon adsorption and automatic control, and has the characteristics of small footprint, strong combination, simple and convenient operation, strong adaptability and stable effect.
Description
技术领域：Technical field:
本发明涉及一种废水的处理方法，特别是电解铝厂生产废水的处理方法。The invention relates to a method for treating wastewater, in particular to a method for treating wastewater produced in an electrolytic aluminum plant.
技术背景：technical background:
电解铝是以氧化铝和氟化盐为原料，以电解的方式生产金属铝；电解铝厂(含阳极系统)的生产废水主要来源：各循环水系统排污，包括旁滤排污、补水处理排污和系统连续排污；余热利用(包括锅炉和发电)系统及除盐水站排污，包括过滤排污、再生排污、系统排污；车间地面清洁和道路浇洒废水；初期雨水冲刷、溶解地面烟气降尘污物进入排水系统。废水污染物受工业生产原料影响以氟化物、石油类、色度和悬浮物为主，其次为COD、溶解固体。现有相关技术集中体现在1991年国家环境保护总局组织编制《工业污染治理技术丛书<有色金属废水治理>废水卷》中。Electrolytic aluminum uses alumina and fluoride salts as raw materials to produce metal aluminum by electrolysis; the main source of production wastewater in electrolytic aluminum plants (including anode systems) is sewage from various circulating water systems, including side filter sewage, water replenishment treatment sewage and Continuous blowdown of the system; blowdown of waste heat utilization (including boiler and power generation) system and desalinated water station, including filter blowdown, regeneration blowdown, and system blowdown; workshop floor cleaning and road watering waste water; initial rainwater washing, dissolved ground smoke and dust fall dirt enter drainage system. Wastewater pollutants affected by industrial production raw materials are mainly fluoride, petroleum, chroma and suspended solids, followed by COD and dissolved solids. Existing related technologies are concentrated in the 1991 State Environmental Protection Administration organized the compilation of "Industrial Pollution Control Technology Series <Nonferrous Metal Wastewater Treatment> Wastewater Volume".
电解铝厂废水污染物状况，色度及油污由炭素生产原料粉尘和设备冷却水排污进入；悬浮物除常规泥砂、胶体物质外，含有部分细小的炭粉粉尘，它们浓度均超过排放标准，为主要处理污染物；氟化物由地面降尘和物料运输散落随地面径流进入废水系统，平均污染物浓度4～6mg/L之间，低于排放标准10mg/L，为次要处理污染物。The status of wastewater pollutants in electrolytic aluminum plants, chroma and oil pollution come from carbon production raw material dust and equipment cooling water discharge; suspended solids include some fine carbon dust in addition to conventional mud sand and colloidal substances, and their concentration exceeds the discharge standard. Mainly treat pollutants; fluoride is scattered by ground dust and material transportation and enters the wastewater system with ground runoff. The average pollutant concentration is between 4 and 6mg/L, which is 10mg/L lower than the discharge standard, and is a secondary treatment pollutant.
电解铝厂(含配套阳极)废水量状况，目前在不考虑废水回用的情况下单位产品废水排放量可控制在3～5m3/t.Al，对于年产20万吨电解铝以上规模的特大型企业废水排放量低于2m3/t.Al，以年产8万吨大一型电解铝厂计，日废水排量低于1000m3/d。因此，电解铝厂(含配套阳极)日废水处理量全部属于较小型规模。The waste water volume of the electrolytic aluminum plant (including supporting anodes), currently, the waste water discharge per unit product can be controlled at 3-5m 3 /t.Al without considering the reuse of waste water. The wastewater discharge of extra-large enterprises is less than 2m 3 /t.Al, and the daily wastewater discharge is less than 1000m 3 /d based on the annual output of a large-scale electrolytic aluminum plant with an annual output of 80,000 tons. Therefore, the daily wastewater treatment capacity of the electrolytic aluminum plant (including supporting anodes) is all on a relatively small scale.
目前废水处理方式状况，国内大多数电解铝厂排水系统采用生产废水和雨水合流排放的系统，生产废水和初期雨水采用常规的沉砂、混凝沉淀、除油处理达标后排放，污泥采用机械脱水和干化场脱水。采用常规的沉砂、混凝沉淀、除油处理方式，其排水系统构筑物为钢筋混凝土结构，操作和控制系统采用人工操作。对于常规处理流程方式，在电解铝厂的废水设计规划和运行管理相对存在一些弱点，由于处理水量规模较小，各工艺构筑物小，设计、施工和日常维护非常不方便；采用钢筋混凝土结构构筑物施工工期较长，配置分散、占地较大，相对投资较大；系统运行调节操作采用人工操作，较为繁琐。对于类似电解铝厂(含配套阳极)较小规模的废水处理设施，采用集成的成套组合设备显然更为合适。同时，由于水资源的日益短缺，通过提高废水的处理深度，以实现废水回用，降低新水消耗，也成为必须解决的技术问题。The current situation of wastewater treatment, the drainage system of most electrolytic aluminum plants in China adopts the combined discharge system of production wastewater and rainwater, and the production wastewater and initial rainwater are discharged after the conventional sand settling, coagulation sedimentation, and oil removal treatment are up to standard, and the sludge is discharged by machinery Dehydration and drying field dehydration. Conventional grit settling, coagulation sedimentation, and oil removal are adopted, and the drainage system structure is reinforced concrete structure, and the operation and control system is manually operated. For the conventional treatment process, there are some weaknesses in the design, planning and operation management of the wastewater in the electrolytic aluminum plant. Due to the small scale of the treated water and the small structures of each process, the design, construction and daily maintenance are very inconvenient; the reinforced concrete structure is used for construction. The construction period is long, the configuration is scattered, the land occupation is large, and the relative investment is large; the system operation adjustment operation is manual operation, which is cumbersome. For small-scale wastewater treatment facilities like electrolytic aluminum plants (including supporting anodes), it is obviously more appropriate to use integrated complete sets of combined equipment. At the same time, due to the increasing shortage of water resources, it has become a technical problem that must be solved by increasing the treatment depth of wastewater to realize wastewater reuse and reduce fresh water consumption.
发明内容：Invention content:
本发明的目的在于：提供一种处理效果较好、设备占地较小的电解铝厂生产废水处理方法，以实现全厂生产废水再生回用或达标排放的目的，并有利于全套处理系统的自动控制。The purpose of the present invention is to provide a method for treating production wastewater in an electrolytic aluminum plant with better treatment effect and less equipment occupation, so as to realize the purpose of regeneration and reuse of production wastewater in the whole plant or discharge up to the standard, and is beneficial to the development of the whole treatment system. automatic control.
本发明是这样构成的：它包括将生产废水及部分雨水经格栅13截污后排入到废水调节池1中调节水质、水量和预沉，大部分泥砂、焦油在废水调节池1中沉积，此时废水悬浮物以比重较小的炭素粉尘等悬浮物以及乳化油和轻质油为主，经废水调节池1完成水质、水量调节和预沉后的废水经废水提升泵提升，经流量计7计量，通过管道混合器2加药后进入微絮凝槽3进行混合反应，然后再将其流入到气浮池4中除去轻质油、乳化油和悬浮物，而后废水经过滤器5进一步处理后，进入到活性炭吸附罐6中进行吸附深化处理，以去除色度和降低COD成份，同时辅助处理氟化物，最后将其流入到回收池14中以便生产重复使用或者直接排放，在向管道混合器2中加药时，采用组合加药装置8向管道混合器2中进行加药，加入的药最好为明矾，其分子式为Al2(SO4)3·k2SO4·12H2O；处理过程中气浮池4、过滤器5和活性炭吸附罐6产生的排渣、排泥11重力排至污泥干化场10干化后外运，干化场10溢流和渗流排水12返回废水调节池1进行再处理。在进行生产废水的处理时，可采用自动控制装置9进行自动控制，并且在自动控制过程中将废水调节池1的水位数据、流量计7的流量、过滤器5和活性炭吸附罐6的运行阻力或设定的运行周期参数都输入自动控制装置9中，以实现设备自动控制。在管道混合器2前安装流量计7，各装置连接自动控制装置9，以废水调节池1的水位高低控制废水提升泵；以流量计7的参数确定处理设备运行台数(当多台设备并联时)和加药量，实现自动加药和设备运行；以过滤器和活性炭吸附罐运行阻力或设定运行周期控制自动反洗，使处理过程自动控制。The present invention is constituted as follows: it includes discharging the production waste water and part of the rainwater into the waste water regulating tank 1 to adjust the water quality, water quantity and pre-sedimentation after being intercepted by the grid 13, and most of the mud, sand and tar are deposited in the waste water regulating tank 1 At this time, the suspended solids in wastewater are mainly suspended solids such as carbon dust with small specific gravity, emulsified oil and light oil. Measured by 7, dosing through the pipeline mixer 2, enter the micro-flocculation tank 3 for mixing reaction, and then flow it into the air flotation tank 4 to remove light oil, emulsified oil and suspended matter, and then the waste water is further treated by the filter 5 , into the activated carbon adsorption tank 6 for adsorption deepening treatment to remove chroma and reduce COD components, and at the same time assist in the treatment of fluoride, and finally flow it into the recovery pool 14 for repeated use in production or direct discharge. When dosing in 2, use the combination dosing device 8 to dosing to the pipeline mixer 2, the medicine added is preferably alum, and its molecular formula is Al 2 (SO 4 ) 3 ·k 2 SO 4 ·12H 2 O; During the treatment process, the slag and sludge 11 produced by the air flotation tank 4, the filter 5 and the activated carbon adsorption tank 6 are gravity discharged to the sludge drying field 10 and then transported outside after being dried. The overflow and percolation drainage 12 of the drying field 10 is returned to the waste water Conditioning tank 1 for reprocessing. When carrying out the treatment of production waste water, can adopt automatic control device 9 to carry out automatic control, and in the process of automatic control, the water level data of waste water regulating tank 1, the flow rate of flow meter 7, the operating resistance of filter 5 and activated carbon adsorption tank 6 Or the set operating cycle parameters are all input into the automatic control device 9 to realize automatic control of the equipment. Flow meter 7 is installed before pipeline mixer 2, and each device is connected with automatic control device 9, controls the waste water lift pump with the height of the water level of waste water regulating tank 1; Determines the number of processing equipment running with the parameter of flow meter 7 (when multiple devices are connected in parallel ) and dosing amount to realize automatic dosing and equipment operation; automatic backwashing is controlled by the running resistance of the filter and activated carbon adsorption tank or the set running cycle, so that the treatment process is automatically controlled.
由于采用了上述技术方案，本发明具有以下优点：该成套处理工艺和设备集加药系统、混合反应、气浮、过滤、活性炭吸附和自动控制为一体，具有结构紧凑、占地面积小、组合性强、操作简单、管理方便、适应性强、处理效果稳定等特点，通过实际生产的探索和完善已定型，处理后的废水可达标排放或回用于厂区绿化、浇洒、循环水补充水等。Due to the adoption of the above technical scheme, the present invention has the following advantages: the complete set of treatment process and equipment integrates dosing system, mixed reaction, air flotation, filtration, activated carbon adsorption and automatic control, and has the advantages of compact structure, small footprint, combined Strong performance, simple operation, convenient management, strong adaptability, stable treatment effect, etc., through the exploration and improvement of actual production, it has been finalized, and the treated wastewater can be discharged up to the standard or reused for plant greening, watering, and circulating water replenishment. wait.
附图说明：Description of drawings:
附图1为本发明的流程示意图。Accompanying drawing 1 is the schematic flow chart of the present invention.
具体实施方式：Detailed ways:
本发明的实施例：本发明的所有装置：格栅13、废水调节池1、管道混合器2、絮凝槽3、气浮池4、过滤器5、活性炭吸附罐6、流量计7、加药装置8、自动控制装置9及使用的水泵等均可直接采用市场上出售的成品进行组装，具体流量下的配置可通过常规计算确定。Embodiment of the present invention: all devices of the present invention: grille 13, wastewater regulating tank 1, pipeline mixer 2, flocculation tank 3, air flotation tank 4, filter 5, activated carbon adsorption tank 6, flow meter 7, dosing device 8. The automatic control device 9 and the water pump used can be directly assembled with finished products sold in the market, and the configuration under the specific flow rate can be determined by conventional calculation.
实施时，按常规方式在废水处理场修建一座废水调节池1，在废水调节池1的前端安装上格栅13，使需处理的液体(即生产废水及部分雨水)经格栅13截污后排入到废水调节池1中进行水质、水量调节和预沉，并在废水调节池1中安装适当台数的提升泵，废水提升泵出水管道安装流量计7和管道混合器2，管道混合器2可直接或用管道与絮凝槽3相连通，并将管道混合器2与加药装置8相连通，然后用管道将絮凝槽3与气浮池4相连接，并使气浮池4处理过的废水进入过滤器5，过滤后的废水进入到活性炭吸附罐6中，当所使用的过滤器5为压力过滤器时，可在气浮池4后面设置一个中间水槽，并在中间水槽上安装加压泵，使被处理的液体通过加压泵后再进入压力过滤器中即可；当需要进行自动控制时，可将各设备装置与自动控制装置9连接，自动控制装置9可直接采用传统的程序控制器装置PLC成品，在进行自动控制时，其控制方式可以水位高低控制废水提升泵，以流量计确定处理设备运行台数(当多台设备并联设置时)和加药量，实现自动加药，以过滤器和活性炭吸附罐的运行阻力或设定运行周期控制自动反洗。During implementation, a waste water regulating pond 1 is built in the waste water treatment field in a conventional manner, and a grille 13 is installed at the front end of the waste water regulating pond 1, so that the liquid to be treated (i.e., production waste water and part of the rainwater) is intercepted by the grille 13. Discharge into the wastewater regulating tank 1 for water quality, water volume regulation and pre-sedimentation, and install an appropriate number of lifting pumps in the wastewater regulating tank 1, and install a flow meter 7, a pipeline mixer 2, and a pipeline mixer 2 on the outlet pipe of the wastewater lifting pump The flocculation tank 3 can be connected directly or with pipelines, and the pipeline mixer 2 can be connected with the dosing device 8, and then the flocculation tank 3 can be connected with the air flotation tank 4 with pipelines, and the waste water treated by the air flotation tank 4 can enter Filter 5, the waste water after filtering enters in the activated carbon adsorption tank 6, when used filter 5 is a pressure filter, can arrange an intermediate water tank behind the air flotation pool 4, and pressurizing pump is installed on the intermediate water tank, make The liquid to be processed can enter the pressure filter after passing through the booster pump; when automatic control is required, each equipment device can be connected with the automatic control device 9, and the automatic control device 9 can directly adopt the traditional program controller device PLC finished products, when performing automatic control, the control method can control the level of the water level to control the waste water lift pump, and use the flow meter to determine the number of processing equipment running (when multiple devices are set in parallel) and the amount of dosing, so as to realize automatic dosing. And the running resistance of the activated carbon adsorption tank or setting the running cycle to control automatic backwashing.
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| CNB2004101554044A CN1319879C (en) | 2004-10-27 | 2004-10-27 | Electrolytic aluminium factory production waste water disposal method |
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| CN1765776A CN1765776A (en) | 2006-05-03 |
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|---|---|---|---|---|
| CN100431979C (en) * | 2006-12-19 | 2008-11-12 | 中国铝业股份有限公司 | Method for Comprehensive Treatment of Alkaline Wastewater and Domestic Sewage from Alumina Plant |
| CN101880078B (en) * | 2010-02-03 | 2012-11-28 | 王鹤立 | High-efficiency low-consumption complete equipment for coagulation clarification sludge concentration |
| CN101811752B (en) * | 2010-03-19 | 2012-03-21 | 江苏大学 | Restaurant wastewater oil remover |
| CN102070266A (en) * | 2010-12-03 | 2011-05-25 | 浙江丰川电子科技有限公司 | Method for recycling industrial cleaning wastewater and device thereof |
| CN102491552B (en) * | 2011-11-24 | 2014-12-10 | 北京天大开元环保科技有限公司 | Method for low temperature rapid removal of COD and ammonia nitrogen material in wastewater |
| CN111977911A (en) * | 2020-08-28 | 2020-11-24 | 贵州中车绿色环保有限公司 | Method for treating leachate wastewater in electrolytic aluminum slag yard |
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| CN1132184A (en) * | 1995-03-31 | 1996-10-02 | 成都华西环保科技公司 | Leather waste water treatment technique |
| CN1178776A (en) * | 1996-10-03 | 1998-04-15 | 曹曼 | Technology for treating waste water of paper making |
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| JP2001170656A (en) * | 1999-11-03 | 2001-06-26 | L'air Liquide | Process for removing solid particulate, more particularly silica and/or alumina particulate from waste water |
| RU2206522C1 (en) * | 2002-02-20 | 2003-06-20 | Общество с ограниченной ответственностью научно-производственная фирма "Гальтек" | Method of treating waste waters to remove cadmium-containing harmful impurities |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1073663A (en) * | 1992-10-15 | 1993-06-30 | 天津市经纬针织厂 | Washing and dyeing wastewater treatment and renovation |
| CN1132184A (en) * | 1995-03-31 | 1996-10-02 | 成都华西环保科技公司 | Leather waste water treatment technique |
| CN1178776A (en) * | 1996-10-03 | 1998-04-15 | 曹曼 | Technology for treating waste water of paper making |
| CN1232793A (en) * | 1999-02-09 | 1999-10-27 | 韩春来 | Film process and its equipment for reuse of oil refining sewage |
| JP2001170656A (en) * | 1999-11-03 | 2001-06-26 | L'air Liquide | Process for removing solid particulate, more particularly silica and/or alumina particulate from waste water |
| RU2206522C1 (en) * | 2002-02-20 | 2003-06-20 | Общество с ограниченной ответственностью научно-производственная фирма "Гальтек" | Method of treating waste waters to remove cadmium-containing harmful impurities |
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| CN1765776A (en) | 2006-05-03 |
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