VAREM聚合氯化鋁計量泵在污水處理中的應用
目前，隨著國內環保污水處理行業投資的不斷加大，VAREM聚合氯化鋁加藥計量泵的市場需求也在不斷增加。VAREM計量泵主要用于工業污水、自來水凈化等領域，這兩個領域的消耗量約占總消耗量的70%。工業污水40%以上用于工業污水凈化；約30%用于自來水凈化和生活污水處理；20%用于工業循環水和河水庫凈化；10%用于其他。VAREM聚合氯化鋁計量泵輸送的介質為聚合氯化鋁，又稱聚合氯化鋁。是一種高效凈水劑。它是一種多羥基、多核絡合物的陽離子無機高分子絮凝劑。固體產品表面呈淺黃色。目前，氯化鋁絮凝劑的研究與開發在我國水處理領域具有重要意義。目前，產品開發有兩個方向。聚合氯化鋁，又稱聚合氯化鋁，是一種高效的凈水劑。它是一種多羥基、多核絡合物的陽離子無機高分子絮凝劑。固體產品表面呈淺黃色。該產品凈水效果顯著，絮凝快，沉降快，活性好，無需添加堿性添加劑即可除菌、除臭、脫色。可有效去除水中的SS、COD、BOD、砷、汞等重金屬。聚合氯化鋁由于其突出的特性和廣泛的應用范圍，已成為國內外公認的優良凈水劑，用量降低30%以上，成本節約40%以上。此外，它還可以用來去除飲用水的水質，如鐵、鎘和氟化物。近年來，聚合氯化鋁已發展成為技術成熟、市場銷售量大的凈水劑，并有逐步取代傳統凈水劑的趨勢。隨著國家環保要求的進一步提高，工業污水處理量仍將大幅增加。聚合氯化鋁是目前國際上廣泛使用的一種新型高效無機高分子混凝劑。其化學通式為[Al2（OH）nCl6-n]m，通過壓縮雙層、吸附電中和、吸附架橋、沉淀網等作用，使水中細小懸浮顆粒和膠體顆粒失穩、聚集、絮凝、凝聚、沉淀。廣泛用于自來水廠、發電廠（火電廠）的供水和工業水凈化，以及化工廠、冶煉廠、石油化工廠、造紙廠、印染廠、印染廠、化工廠等各種工廠的工業廢水處理。其性能優于傳統的硫酸鋁、硫酸亞鐵等低分子無機鹽。此外，它還具有投加量小、明礬量大、去除COD、色度和懸浮物性能好等優點。VAREM聚合氯化鋁加藥計量泵的應用范圍：聚合氯化鋁是國際上普遍使用的新型高效無機高分子混凝劑。它通過壓縮雙層、吸附中和、吸附架橋、沉淀網等作用機理，使水中細小懸浮顆粒和膠體顆粒失穩、聚集、絮凝、凝聚、沉淀。因此，VAREM聚合氯化鋁加藥計量泵也廣泛應用于自來水廠、發電廠（火電廠）的供水和工業水凈化，以及化工廠、冶煉廠、石油化工廠、造紙廠、印染廠、印染廠、印染廠、印染廠等各種工廠的給水和工業水凈化化工廠。其性能優于傳統的硫酸鋁、硫酸亞鐵等低分子無機鹽。此外，它還具有投加量小、明礬量大、去除COD、色度和懸浮物性能好等優點。該工藝以鋁土礦或副產鋁灰、工業鹽酸或廢鹽酸為原料，一步生產聚合氯化鋁。產品質量符合gb15892-1995標準，達到同類產品的先進水平。
VAREM聚氯化鋁加藥計量泵在市場上的兩大優勢：
首先，我國聚合氯化鋁生產的設備投資和成本遠低于國外，產品在國際市場上具有很大的競爭優勢。目前，PAC的年凈出口量約為3.4萬噸。國內企業可以在未來幾年將產品推向國際市場。
第二，未來幾年國內對聚合氯化鋁的需求將大幅增長。我國提出的污水處理目標是2011年城市污水集中處理率達到50%。預計國家將投資6500億元，用于處理工業廢水和城市污水。
聚合氯化鋁是國內外發展迅速的精細化工產品。它是一種高效的水處理絮凝劑，其研究開發對水處理和精細化工具有重要意義。目前，產品開發有兩個方向。一是開發制備聚合氯化鋁產品的新材料。用鋁屑、鋁灰、鋁渣等原料制備聚合氯化鋁產品工藝相對簡單，早期發展較快。但近年來，由于鋁屑、鋁灰等含鋁材料價格不斷上漲，以及利用這些材料生產其他價值較高的含鋁產品的出現，用這種原料生產聚合氯化鋁的產量日益減少。由于氫氧化鋁和氯化鋁的生產成本太高，國內一般采用含鋁礦物制備聚合氯化鋁。近年來，利用工業廢棄物（粉煤灰、煤矸石）作為原料的研究應引起足夠的重視。以工業廢料為原料生產聚合氯化鋁，不僅節約了材料成本，而且實現了廢棄物的回收利用，是一個具有很大市場應用前景的研究領域。另一個方向是將聚合氯化鋁與無機或有機高分子絮凝劑復合或復合應用研究，復合或復合藥劑可以彌補單一絮凝劑的不足，既有單一絮凝劑的優點，應用范圍廣，又能提高去除率有機物的存在，降低了殘留金屬離子的濃度，可以顯著提高絮凝效果。另外，國內PAC生產過程多為間歇式生產，污染嚴重，原料利用率低，產品質量不穩定。開發高效、連續的生產工藝將成為未來工業生產研究的熱點。
近年來，我國聚合氯化鋁產業發展迅速，擁有300多家生產企業。2005年生產能力達到17萬噸/年（按氧化鋁含量30%的固體產品計）。但生產企業規模較小，年產量以2000-5000噸為主；產業發展的區域性特征明顯，主要分布在河南、山東、江蘇、浙江等地，河南省鞏義地區有生產企業77家，占比超過50家占全國產量的30%。我國原料來源豐富，聚合氯化鋁的生產成本相對較低。聚合氯化鋁的生產工藝有很多種。首先以鋁灰為原料，然后用粘土礦、高嶺石、鋁土礦等為原料。目前，由于國內外市場產品質量指標的不斷提高，我國使用的原材料已逐漸轉向氫氧化鋁。目前，滾筒干燥在國內固體產品中得到廣泛應用，其技術已接近或達到先進水平。
上海龍亞泵閥提供的VAREM聚氯化鋁加藥計量泵附件及應用：微計量泵的基本附件包包括：底閥、注射閥、2米吸入管和5米排出管（電機型無此配置）。液壓端包括：泵頭、隔膜、閥門、背板、安裝螺栓等。
Application of VAREM polyaluminum chloride metering pump in wastewater treatment
At present, with the increasing investment of domestic environmental protection sewage treatment industry, the market demand of VAREM polyaluminum chloride dosing metering pump is also increasing. VAREM polyaluminum chloride dosing metering pump is mainly used in industrial sewage, tap water purification and other fields, the consumption of these two areas accounts for about 70% of the total consumption. More than 40% of industrial sewage is used for industrial sewage purification; about 30% is used for tap water purification and domestic sewage treatment; 20% is used for industrial circulating water and river reservoir purification; and 10% is used for other purposes. The medium conveyed by VAREM polyaluminum chloride metering pump is polyaluminum chloride, also known as polyaluminum chloride. It is a kind of high efficiency water purifying agent. It is a kind of cationic inorganic polymer flocculant with polyhydroxy and multinuclear complex. The surface of solid product is light yellow. At present, the research and development of aluminum chloride flocculant is of great significance in the field of water treatment in China. At present, there are two directions for product development. Polyaluminum chloride, also known as polyaluminum chloride, is a kind of high efficiency water purifying agent. It is a kind of cationic inorganic polymer flocculant with polyhydroxy and multinuclear complex. The surface of solid product is light yellow. The product has remarkable water purification effect, fast flocculation, fast sedimentation and good activity. It can remove bacteria, deodorization and decolorization without adding alkaline additives. It can effectively remove SS, COD, BOD, arsenic, mercury and other heavy metals in water. Due to its outstanding characteristics and wide range of application, polyaluminum chloride has become an excellent water purification agent recognized at home and abroad. The dosage is reduced by more than 30% and the cost is saved by more than 40%. In addition, it can be used to remove the quality of drinking water, such as iron, cadmium and fluoride. In recent years, polyaluminum chloride has developed into a kind of water purifying agent with mature technology and large market sales volume, and has the trend of gradually replacing the traditional water purifying agent. With the further improvement of national environmental protection requirements, the industrial sewage treatment capacity will still increase significantly. Polyaluminum chloride is a new type of inorganic polymer coagulant widely used in the world. The general chemical formula is [Al2 (OH) nCl6-n] m. The fine suspended particles and colloidal particles in water are unstable, agglomerated, flocculated, coagulated and precipitated by compressing double layers, neutralizing by adsorption, bridging by adsorption and sedimentation network. It is widely used for water supply and industrial water purification in waterworks, power plants (thermal power plants), and industrial wastewater treatment in chemical plants, smelters, petrochemical plants, paper mills, printing and dyeing plants, chemical plants and other factories. Its performance is better than the traditional aluminum sulfate, ferrous sulfate and other low molecular weight inorganic salts. In addition, it has the advantages of small dosage, large amount of alum, good performance of removing COD, chroma and suspended solids. Application scope of VAREM polyaluminum chloride dosing metering pump: polyaluminum chloride is a new type of high-efficiency inorganic polymer coagulant widely used in the world. Through the mechanism of compression double layer, adsorption neutralization, adsorption bridging and sedimentation network, the fine suspended particles and colloidal particles in water are unstable, agglomerated, flocculated and precipitated. Therefore, VAREM polyaluminum chloride dosing metering pump is also widely used in water supply and industrial water purification of waterworks, power plants (thermal power plants), as well as water supply and industrial water purification chemical plants of chemical plants, smelters, petrochemical plants, paper mills, printing and dyeing plants, printing and dyeing plants, printing and dyeing plants. Its performance is better than the traditional aluminum sulfate, ferrous sulfate and other low molecular weight inorganic salts. In addition, it has the advantages of small dosage, large amount of alum, good performance of removing COD, chroma and suspended solids. The process uses bauxite or by-product aluminum ash, industrial hydrochloric acid or waste hydrochloric acid as raw materials to produce polyaluminum chloride in one step. The product quality is in line with the GB 15892-1995 standard, reaching the some advanced level of similar products.
Two advantages of VAREM polyaluminum chloride dosing metering pump in the market:
First of all, the equipment investment and cost of polyaluminum chloride production in China are far lower than those in foreign countries, and the products have great competitive advantages in the international market. At present, the annual net export volume of PAC is about 34000 tons. Domestic enterprises can push their products to the international market in the next few years.
Second, the domestic demand for polyaluminum chloride will increase substantially in the next few years. The goal of sewage treatment proposed by China is to achieve 50% centralized treatment rate of urban sewage in 2011. It is estimated that the state will invest 650 billion yuan to treat industrial wastewater and urban sewage.
Polyaluminum chloride is a fine chemical product with rapid development at home and abroad. It is an efficient flocculant for water treatment, and its research and development is of great significance to water treatment and fine chemical industry. At present, there are two directions for product development. A new product of aluminum chloride is developed. The preparation process of polyaluminum chloride from aluminum chips, aluminum ash, aluminum slag and other raw materials is relatively simple, and its early development is rapid. However, in recent years, due to the rising prices of aluminum chips, aluminum ash and other aluminum containing materials, and the emergence of using these materials to produce other high value aluminum products, the production of polyaluminum chloride with this raw material is decreasing. Due to the high production cost of aluminum chloride and aluminum chloride in China, aluminum chloride is widely used in production. In recent years, the research on using industrial waste (fly ash, coal gangue) as raw materials should be paid enough attention to. The production of polyaluminum chloride from industrial waste not only saves the material cost, but also realizes the recycling of waste. It is a research field with great market application prospect. The other direction is to study the composite or composite application of polyaluminum chloride and inorganic or organic polymer flocculant. The composite or composite agent can make up for the deficiency of single flocculant. It has the advantages of single flocculant, has a wide range of application, and can improve the removal rate of organic matter, reduce the concentration of residual metal ions, and significantly improve the flocculation effect. In addition, the domestic PAC production process is mostly intermittent production, which causes serious pollution, low utilization rate of raw materials and unstable product quality. The development of efficient and continuous production process will become the hot spot of industrial production research in the future.
In recent years, China's polyaluminum chloride industry has developed rapidly, with more than 300 production enterprises. In 2005, the production capacity reached 170000 tons / year (based on solid products with 30% alumina content). However, the scale of production enterprises is small, and the annual output is mainly 2000-5000 tons; the regional characteristics of industrial development are obvious, mainly distributed in Henan, Shandong, Jiangsu, Zhejiang and other places. There are 77 production enterprises in Gongyi area of Henan Province, accounting for more than 50, accounting for 30% of the national output. China is rich in raw materials, and the production cost of polyaluminum chloride is relatively low. There are many production processes of polyaluminum chloride. Firstly, aluminum ash is used as raw material, and then clay ore, kaolinite and bauxite are used as raw materials. At present, due to the continuous improvement of product quality index at home and abroad, the raw material used in China has gradually turned to aluminum hydroxide. At present, drum drying has been widely used in domestic solid products, and its technology has approached or reached advanced level.
VAREM polyaluminum chloride dosing metering pump accessories and applications provided by Shanghai Longya pump valve: the basic accessories of micro metering pump include: bottom valve, injection valve, 2 m suction pipe and 5 m discharge pipe (no such configuration for motor type). Hydraulic end includes: pump head, diaphragm, valve, back plate, mounting bolt, etc.