TWI545080B - A heavy metal scavenger and a method of removing heavy metals from an aqueous solution - Google Patents
A heavy metal scavenger and a method of removing heavy metals from an aqueous solution Download PDFInfo
- Publication number
- TWI545080B TWI545080B TW104105231A TW104105231A TWI545080B TW I545080 B TWI545080 B TW I545080B TW 104105231 A TW104105231 A TW 104105231A TW 104105231 A TW104105231 A TW 104105231A TW I545080 B TWI545080 B TW I545080B
- Authority
- TW
- Taiwan
- Prior art keywords
- sulfide
- heavy metal
- aqueous solution
- polyamine compound
- sodium
- Prior art date
Links
Classifications
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic 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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
- C02F1/64—Heavy metal compounds of iron or manganese
-
- 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
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/206—Manganese or manganese 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
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
Description
本發明是關於一種重金屬捕集劑,且特別是一種用於去除水溶液中的重金屬的重金屬捕集劑,以及一種利用此重金屬捕集劑去除水溶液中的重金屬的方法。 The present invention relates to a heavy metal collector, and more particularly to a heavy metal collector for removing heavy metals in an aqueous solution, and a method for removing heavy metals in an aqueous solution using the heavy metal collector.
各種工業,例如塑膠製造、金屬電鍍、金屬修整和半導體製造,皆會產生大量的工業廢水。這些工業廢水通常含有大量的重金屬,例如銅、鎘、鉛、汞、鎳、鉻、錳、鋅、錫、銻或砷等。由於重金屬對人體和水中生物有害,世界各國對於工業廢水中的重金屬含量有嚴格的規範。隨著環保意識的抬頭,各國對於重金屬含量的規範越趨嚴格。因此,業者無不傾力研發低成本高效率的廢水處理系統,以使所排放的廢水符合越來越嚴格的重金屬含量規範。 Various industries, such as plastics manufacturing, metal plating, metal finishing and semiconductor manufacturing, generate large amounts of industrial wastewater. These industrial wastewaters usually contain large amounts of heavy metals such as copper, cadmium, lead, mercury, nickel, chromium, manganese, zinc, tin, antimony or arsenic. Because heavy metals are harmful to humans and aquatic organisms, countries around the world have strict regulations on the content of heavy metals in industrial wastewater. With the rise of environmental awareness, the standards for heavy metal content in various countries have become stricter. Therefore, the industry is committed to the development of low-cost and high-efficiency wastewater treatment systems, so that the discharged wastewater meets the increasingly strict heavy metal content specifications.
習知另一種去除廢水中的重金屬的方法,是先在廢水中添加鹼金屬的硫化物以形成金屬硫化物,然後再添加凝聚劑或過濾助劑以破壞溶液膠體粒子,加速金屬硫化物的聚集和沉澱。 Another method for removing heavy metals in wastewater is to first add an alkali metal sulfide to the wastewater to form a metal sulfide, and then add a coagulant or a filter aid to destroy the colloidal particles of the solution and accelerate the aggregation of the metal sulfide. And precipitation.
然而,由於凝聚劑或過濾助劑都是由含陰離子 團或含陽離子團的高分子所構成,其雖可加速金屬硫化物的凝聚或沉澱,但所產生的大量含金屬硫化物的泥漿,必須再以固液分離機脫水,使重金屬硫化物自廢水中分離,增加廢水處理的製程複雜度以及處理成本。 However, since the coagulant or filter aid is composed of an anion a cluster or a polymer containing a cationic group, which accelerates the aggregation or precipitation of metal sulfides, but the large amount of sludge containing metal sulfides must be dehydrated by a solid-liquid separator to make heavy metal sulfides from wastewater. Separation increases the process complexity and processing costs of wastewater treatment.
有鑑於此,一種新穎的重金屬捕集劑以及利用 此重金屬捕集劑以去除水溶液中的重金屬的方法乃業界所殷切期盼的。 In view of this, a novel heavy metal collector and utilization The method of removing heavy metals in an aqueous solution by this heavy metal collector is highly desirable in the industry.
本發明之目的是提供一種重金屬捕集劑,包括至少一種硫化物以及至少一種多胺化合物,可用於捕集水溶液中的重金屬,例如銅、鎘、鉛、汞、鎳、鉻、錳、鋅、錫、銻或砷等重金屬其中之一或其混合。 It is an object of the present invention to provide a heavy metal collector comprising at least one sulfide and at least one polyamine compound for capturing heavy metals in aqueous solutions, such as copper, cadmium, lead, mercury, nickel, chromium, manganese, zinc, One of or a mixture of heavy metals such as tin, antimony or arsenic.
本發明之另一目的是提供一種去除水溶液中的重金屬的方法,其步驟包括:提供一含重金屬的水溶液;添加至少一硫化物至該水溶液中;添加至少一種多胺化合物至該水溶液中;靜置使該硫化物、該多胺化合物與該重金屬形成沉澱物;以及將該沉澱物自該水溶液中分離。其中,根據本發明之上述去除水溶液中的重金屬的方法,硫化物以及多胺化合物,可同時或先、後加入含重金屬的水溶液中,不影響其去除重金屬的效率。 Another object of the present invention is to provide a method for removing heavy metals in an aqueous solution, the steps comprising: providing an aqueous solution containing a heavy metal; adding at least one sulfide to the aqueous solution; adding at least one polyamine compound to the aqueous solution; The sulfide, the polyamine compound and the heavy metal are allowed to form a precipitate; and the precipitate is separated from the aqueous solution. Among them, according to the above method for removing heavy metals in an aqueous solution according to the present invention, sulfides and polyamine compounds can be added to the aqueous solution containing heavy metals simultaneously or first, without affecting the efficiency of removing heavy metals.
在一些實施例中,上述硫化物與該多胺化合物 的重量比為0.8:1~40:1,而增加多胺化合物的添加量可提高重金屬去除率,所以較佳的硫化物與該多胺化合物的重量比為0.8:1~20:1,更佳的硫化物與該多胺化合物的重量比則為0.8:1~10:1。 In some embodiments, the above sulfide and the polyamine compound The weight ratio is 0.8:1~40:1, and increasing the addition amount of the polyamine compound can increase the removal rate of heavy metals, so the weight ratio of the preferred sulfide to the polyamine compound is 0.8:1~20:1, The weight ratio of the preferred sulfide to the polyamine compound is from 0.8:1 to 10:1.
在一些實施例中,上述硫化物例如可包括硫化 鉀、硫氫化鉀、硫化鈉、硫氫化鈉、多硫化鈉其中之一或其混合物或其他硫化物。 In some embodiments, the above sulfides may include, for example, sulfurization One of potassium, potassium hydrosulfide, sodium sulfide, sodium hydrosulfide, sodium polysulfide or a mixture thereof or other sulfides.
在一些實施例中,上述多胺化合物包括至少一 種二胺化合物。 In some embodiments, the above polyamine compound includes at least one A diamine compound.
在一些實施例中,上述二胺化合物,例如3-二 乙胺基丙胺(3-diethyl-amino-propyl-amine,DEAPA)、3-二甲胺基丙胺(3-dimethyl-amino-propyl-amine,DMAPA)、乙二胺(ethylenediamine)、丙二胺(1,3-diaminopropane)、N-(2-氨基乙基)乙醇胺(N-(2-Aminoethyl)ethanolamine)或四甲基乙二胺(Tetramethylethylenediamine,TMEDA)等。 In some embodiments, the above diamine compound, such as 3-di 3-diethyl-amino-propyl-amine (DEAPA), 3-dimethyl-amino-propyl-amine (DMAPA), ethylenediamine, propylenediamine ( 1,3-diaminopropane), N-(2-aminoethyl)ethanolamine or Tetramethylethylenediamine (TMEDA).
以下將以實施例1~7以及比較例1~6分別說明使用本發明所揭示的重金屬捕集劑及使用習知技術,以去除水溶液中的銅離子。實施例1~7以及比較例1~6的重金屬捕集劑成分,整理於表一。 Hereinafter, the heavy metal collectors disclosed in the present invention and the conventional techniques for removing copper ions in an aqueous solution will be described with reference to Examples 1 to 7 and Comparative Examples 1 to 6, respectively. The heavy metal collector components of Examples 1 to 7 and Comparative Examples 1 to 6 were prepared in Table 1.
實施例1~7以及比較例1~6之銅去除率的評估 方式,主要是在銅離子濃度為42ppm的水溶液500毫升中分別添加0.3毫升實施例1~7以及比較例1~6之重金屬捕集劑,接著以轉速500rpm攪拌30分鐘後,靜置一小時。然後分別抽取實施例1~7和比較例1~6的上層液,以ICP-MASS分析上層液的銅含量,並依式(1): ,計算銅離子去除 率。上層液霧度的評估方式,主要是取上層液10ml裝入潔淨的20ml透明玻璃瓶中,並以純水做為參考對象(霧度為0),然後將樣品以霧度計NDH-5000進行分析,而得到霧度分析結果。實施例1~7和比較例1~6的分析結果列於表二中。 The evaluation methods of the copper removal rates of Examples 1 to 7 and Comparative Examples 1 to 6 were mainly carried out by adding 0.3 ml of the heavy metals of Examples 1 to 7 and Comparative Examples 1 to 6 to 500 ml of an aqueous solution having a copper ion concentration of 42 ppm. The collecting agent was then stirred at a rotation speed of 500 rpm for 30 minutes and then allowed to stand for one hour. Then, the supernatant liquids of Examples 1 to 7 and Comparative Examples 1 to 6 were separately extracted, and the copper content of the supernatant liquid was analyzed by ICP-MASS, and according to the formula (1): Calculate the copper ion removal rate. The evaluation method of the upper liquid haze is mainly to take 10 ml of the upper liquid into a clean 20 ml clear glass bottle, and use pure water as a reference object (haze of 0), and then carry out the sample in haze meter NDH-5000. Analysis, and the haze analysis results were obtained. The analysis results of Examples 1 to 7 and Comparative Examples 1 to 6 are shown in Table 2.
此外,實施例1~7中的硫氫化鈉以及多胺化合物,可同時或先、後加入含銅離子的水溶液中,不影響其去除銅離子的效率。 Further, the sodium hydrosulfide and the polyamine compound in Examples 1 to 7 can be added to the aqueous solution containing copper ions simultaneously or first, without affecting the efficiency of removing copper ions.
惟本發明的重金屬捕集劑不侷限於僅能用以去除水溶液中的銅離子,其他例如鎘、鉛、汞、鎳、鉻、錳、鋅、錫、銻或砷等常見的重金屬也可利用本發明所揭示的重金屬捕集劑去除之。 However, the heavy metal collector of the present invention is not limited to only removing copper ions in an aqueous solution, and other common heavy metals such as cadmium, lead, mercury, nickel, chromium, manganese, zinc, tin, antimony or arsenic may also be utilized. The heavy metal collector disclosed in the present invention is removed.
此外,各實施例的重金屬捕集劑中的硫化物雖使用硫氫化鈉作為例示,惟本發明所揭示的重金屬捕集劑中的硫化物,包括硫化鉀、硫氫化鉀、硫化鈉、硫氫化鈉、 多硫化鈉其中之一或其混合物或其他硫化物等,仍在本發明的專利範圍內。 Further, although the sulfide in the heavy metal collector of each embodiment is exemplified using sodium hydrosulfide, the sulfide in the heavy metal collector disclosed in the present invention includes potassium sulfide, potassium hydrosulfide, sodium sulfide, sulfuric acid. sodium, One of the sodium polysulfides or a mixture thereof or other sulfides, etc., is still within the scope of the present invention.
此外,各實施例的重金屬捕集劑中的多胺化合 物包括3-二乙胺基丙胺(3-diethyl-amino-propyl-amine,DEAPA)、丙二胺(1,3-diaminopropane)、N-(2-氨基乙基)乙醇胺(N-(2-Aminoethyl)ethanolamine)或四甲基乙二胺(Tetramethylethylenediamine,TMEDA)等,惟上述多胺化合物僅用於例示說明,而非侷限於上述多胺化合物,其他的多胺化合物例如3-二甲胺基丙胺(3-dimethyl-amino-propyl-amine,DMAPA)、乙二胺(ethylenediamine)等仍在本發明的專利範圍內。 Further, the polyamine compound in the heavy metal collector of each of the examples Including 3-diethyl-amino-propyl-amine (DEAPA), propylenediamine (1,3-diaminopropane), N-(2-aminoethyl)ethanolamine (N-(2-) Aminoethyl)ethanolamine) or Tetramethylethylenediamine (TMEDA), etc., but the above polyamine compounds are for illustrative purposes only, and are not limited to the above polyamine compounds, and other polyamine compounds such as 3-dimethylamino 3-dimethyl-amino-propyl-amine (DMAPA), ethylenediamine and the like are still within the scope of the present invention.
實施例1~7及比較例1~6中各重金屬捕集劑的成 份及其重量百分比整理於表一,而各實施例及各比較例的重金屬捕集劑加入含銅離子水溶液後,攪拌再靜置後的上層液之殘留銅離子濃度、依式(1)所計算出來的銅離子去除率和上層液的霧度,則整理於表二。 Formation of each heavy metal trapping agent in Examples 1 to 7 and Comparative Examples 1 to 6 The parts and their weight percentages are summarized in Table 1, and the residual copper ion concentration of the supernatant liquid after the addition of the copper ion aqueous solution in each of the examples and the comparative examples is stirred and then allowed to stand, according to the formula (1) The calculated copper ion removal rate and the haze of the supernatant liquid are summarized in Table 2.
如表一所示,實施例1~7以及比較例1~6的重金 屬捕集劑中的硫氫化鈉的重量百分比均相同,其差別僅在 於實施例1~7添加如表一所示的多胺化合物,且硫氫化鈉相對於多胺化合物的重量百分比的比例介於0.8:1~40:1不等;比較例1無添加胺類化合物,而比較例2~6則添加如表一所示的單胺化合物。 As shown in Table 1, the heavy gold of Examples 1 to 7 and Comparative Examples 1 to 6 The weight percentage of sodium hydrosulfide in the collector is the same, the difference is only in The polyamine compounds shown in Table 1 were added to Examples 1 to 7, and the ratio of the weight percentage of sodium hydrosulfide to the polyamine compound was from 0.8:1 to 40:1; Comparative Example 1 had no added amines. For the compounds, Comparative Examples 2 to 6 were added with a monoamine compound as shown in Table 1.
如表二所示,實施例1~7的銅離子去除率均大 於70%,且實施例2~7的銅離子去除率更高於96%;相對地,比較例1~6,其銅離子去除率僅介於21.4%~33.3%。 As shown in Table 2, the copper ion removal rates of Examples 1 to 7 were both large. At 70%, and the copper ion removal rates of Examples 2-7 were higher than 96%; in contrast, in Comparative Examples 1 to 6, the copper ion removal rate was only between 21.4% and 33.3%.
此外,如表二所示,使用實施例1~7的金屬捕 集劑去除水溶液中的銅離子,其不僅銅離子去除率高,且上層液的霧度均低於34Haze%,且實施例3~7的霧度更低於10Haze%,顯示添加實施例1~7重金屬捕集劑的含重金屬溶液,經靜置後可直接產生沉澱,不需添加有機高分子絮凝劑,因此可大幅減少金屬汙泥量的產生。相對地,使用比較例1~6的重金屬捕集劑去除水溶液中的銅離子,其不僅銅離子去除率低,且上層液的霧度均高於79Haze%,顯示使用比較例1~6的重金屬捕集劑所產生的金屬汙泥沉澱效率差,還需要添加絮凝劑才能使金屬汙泥沉降,不僅產生更大量的金屬汙泥,也增加很多去除水溶液中重金屬的成本。 In addition, as shown in Table 2, the metal traps of Examples 1 to 7 were used. The collector removes copper ions in the aqueous solution, and the copper ion removal rate is high, and the haze of the upper liquid layer is lower than 34 Haze%, and the haze of Examples 3 to 7 is lower than 10 Haze%, indicating that the addition example 1~ The heavy metal solution of the 7 heavy metal collector can directly form a precipitate after standing, and does not need to add an organic polymer flocculant, thereby greatly reducing the amount of metal sludge. In contrast, the heavy metal collectors of Comparative Examples 1 to 6 were used to remove copper ions in the aqueous solution, and the copper ion removal rate was low, and the haze of the upper liquid layer was higher than 79 Haze%, indicating that the heavy metals of Comparative Examples 1 to 6 were used. The metal sludge produced by the collector has poor sedimentation efficiency, and it is also necessary to add a flocculant to settle the metal sludge, which not only produces a larger amount of metal sludge, but also increases the cost of removing heavy metals in the aqueous solution.
雖然本發明已以較佳實施例揭露如上,然其並 非用以限定本發明,任何所屬技術領域中具有通常知識者,在不脫離本發明之精神和範圍內,當可更動與組合上述各種實施例。 Although the present invention has been disclosed above in the preferred embodiment, The various embodiments described above may be modified and combined without departing from the spirit and scope of the invention.
Claims (11)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW104105231A TWI545080B (en) | 2015-02-16 | 2015-02-16 | A heavy metal scavenger and a method of removing heavy metals from an aqueous solution |
CN201610085508.5A CN105883998A (en) | 2015-02-16 | 2016-02-15 | Heavy metal trapping agent and method for removing heavy metal in aqueous solution |
CN202210124851.1A CN114644387A (en) | 2015-02-16 | 2016-02-15 | Heavy metal trapping agent and method for removing heavy metal in aqueous solution |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW104105231A TWI545080B (en) | 2015-02-16 | 2015-02-16 | A heavy metal scavenger and a method of removing heavy metals from an aqueous solution |
Publications (2)
Publication Number | Publication Date |
---|---|
TWI545080B true TWI545080B (en) | 2016-08-11 |
TW201630804A TW201630804A (en) | 2016-09-01 |
Family
ID=57013737
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW104105231A TWI545080B (en) | 2015-02-16 | 2015-02-16 | A heavy metal scavenger and a method of removing heavy metals from an aqueous solution |
Country Status (2)
Country | Link |
---|---|
CN (2) | CN105883998A (en) |
TW (1) | TWI545080B (en) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3903775A1 (en) * | 1989-02-09 | 1990-08-23 | Chen Li Fei | Process for treating heavy metals in waste waters |
JP3817720B2 (en) * | 1996-11-05 | 2006-09-06 | 日本曹達株式会社 | Heavy metal fixative |
JP3517697B2 (en) * | 1999-05-07 | 2004-04-12 | 独立行政法人産業技術総合研究所 | Method and remover for removing heavy metal ions |
US6896817B2 (en) * | 2002-04-15 | 2005-05-24 | Gregory S. Bowers | Essentially insoluble heavy metal sulfide slurry for wastewater treatment |
JP2004105833A (en) * | 2002-09-17 | 2004-04-08 | Nagao Kk | Wastewater treatment method and its apparatus |
US7722841B2 (en) * | 2006-04-25 | 2010-05-25 | General Electric Company | Polymeric chelant and coagulant to treat metal-containing wastewater |
CN101081827A (en) * | 2006-05-29 | 2007-12-05 | 天津瑞发化工科技发展有限公司 | Chelating agent capable of simultaneously processing multiple heavy metallic ions |
CN101857296B (en) * | 2010-06-29 | 2013-08-07 | 湖南科技大学 | Ethylenediamine-based heavy metal chelating agent and preparation method thereof |
CN102659231B (en) * | 2012-05-26 | 2013-11-20 | 江南大学 | Preparation and application of water-soluble macromolecule heavy-metal collector |
CN102942512A (en) * | 2012-11-21 | 2013-02-27 | 南京师范大学 | Preparation method of sulfide heavy metal trapping agent C2H4N2S4 |
CN103466775B (en) * | 2013-09-27 | 2014-10-08 | 广西博世科环保科技股份有限公司 | Method for preparing heavy metal ion catching agent |
-
2015
- 2015-02-16 TW TW104105231A patent/TWI545080B/en active
-
2016
- 2016-02-15 CN CN201610085508.5A patent/CN105883998A/en active Pending
- 2016-02-15 CN CN202210124851.1A patent/CN114644387A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
CN105883998A (en) | 2016-08-24 |
CN114644387A (en) | 2022-06-21 |
TW201630804A (en) | 2016-09-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
Wang et al. | Adsorption of uranium (VI) from aqueous solution onto cross-linked chitosan | |
CN103224472B (en) | Preparation method of heavy metal capturing agent | |
CN102001734B (en) | Heavy metal settling agent for treating mercury-containing wastewater | |
CN105293603A (en) | Heavy metal wastewater treatment medicament and treatment method of heavy metal wastewater | |
CN103482783A (en) | Treatment process for plumbic acid waste water generated in production process of lead storage batteries | |
CN106430484A (en) | Efficient heavy metal trapping agent | |
CN113401996A (en) | Water treatment defluorination medicament and preparation method thereof | |
TWI545080B (en) | A heavy metal scavenger and a method of removing heavy metals from an aqueous solution | |
JP6826950B2 (en) | Heavy metal immobilization method in fly ash | |
CN106745626B (en) | Treatment method and application of fluorine-containing wastewater | |
JP4723624B2 (en) | Disposal of chlorine-containing fine powder waste | |
CN109368847A (en) | A kind of composite flocculation agent and preparation method thereof | |
JP6701085B2 (en) | Method of heavy metal removal from wastewater streams | |
RU2598935C1 (en) | Method for removing arsenic compounds from drinking water | |
AU2019430430B2 (en) | Method and process arrangement for removing Si based compounds from a leaching liquor and use | |
CN109231226B (en) | Method for removing aluminum ions in solution by using sodalite and desorption method thereof | |
CN105776661A (en) | Method for treating rare earth industrial waste water through membrane | |
JP5479923B2 (en) | Wastewater treatment method | |
JP6798867B2 (en) | Wastewater treatment method and wastewater treatment equipment | |
CN108862728A (en) | A kind of method of water treatment technology | |
CN103359819A (en) | Method for treating high-concentration nickel-containing wastewater by adjusting pH value | |
CN102350176A (en) | Method for treating fluoride waste water and gas | |
JP5965164B2 (en) | Cadmium-containing wastewater treatment method | |
CN109154033B (en) | Method for separating mercury from ore leaching solution | |
CN105645535A (en) | Flocculating agent |