多介質(zhì)過濾器是本系統(tǒng)的重要預(yù)處理裝置，它采用均質(zhì)石英砂和無煙媒作為濾料，它的作用是濾除原水帶來的細(xì)小顆粒、懸浮物、膠體等雜質(zhì)，保證產(chǎn)水水質(zhì)滿足反滲透裝置的進(jìn)水水質(zhì)要求。
Multimedia filter is an important pretreatment device of this system. It uses homogeneous quartz sand and smokeless media as filter material. Its function is to filter out fine particles, suspended solids, colloids and other impurities brought by raw water, so as to ensure that the quality of produced water meets the requirements of influent water quality of reverse osmosis device.
多介質(zhì)過濾器(濾床)，既采用兩種以上的介質(zhì)作為濾層的介質(zhì)過濾器，在工業(yè)循環(huán)水處理系統(tǒng)中，用以去除污水中雜質(zhì)、吸附油等，使水質(zhì)符合循環(huán)使用的要求。過濾的作用，主要是去除水中的懸浮或膠態(tài)雜質(zhì)，特別是能有效地去除沉淀技術(shù)不能去除的微小粒子和細(xì)菌等，BODs和COD等也有某種程度的去除效果。
Multimedia filter (filter bed), which uses more than two kinds of media as filter layer, is used to remove impurities and adsorb oil in industrial circulating water treatment system, so that the water quality meets the requirements of recycling. The main function of filtration is to remove suspended or colloidal impurities in water, especially small particles and bacteria which can not be removed by precipitation technology. BODs and COD also have some removal effect.
濾料的選擇依據(jù)
Selection Basis of Filter Material
(1)必須有足夠的機(jī)械強(qiáng)度，以免在反沖洗過程中很快地磨損和破碎；
(1) Sufficient mechanical strength must be provided to prevent rapid wear and tear during backwashing.
(2)化學(xué)穩(wěn)定性要好；
(2) Good chemical stability;
(3)不含有對人體健康有害及有毒物質(zhì)，不含有對生產(chǎn)有害、影響生產(chǎn)的物質(zhì)；
(3) It does not contain substances harmful to human health or toxic substances, or substances harmful to production or affecting production;
(4)濾料的選擇，應(yīng)盡量采用吸附能力、截污能力大、產(chǎn)水量高、出水水質(zhì)好的濾料。
(4) In the selection of filter materials, the filter materials with high adsorption capacity, high sewage interception capacity, high water yield and good effluent quality should be adopted as far as possible.
在濾料中，卵石主要是起支撐作用，在過濾工藝過程中，因其強(qiáng)度高，相互之間的間距縫隙穩(wěn)定，孔隙大，便于正洗工序中，濾后水順利通過；同樣，反洗工序中，反洗水和反洗空氣等能順利通過。常規(guī)配置中，卵石分為四種規(guī)格，鋪墊方式為自下而上先大后小。
In the filter material, the pebble mainly plays a supporting role. In the process of filtration, because of its high strength, stable gap between each other, large pore, easy to wash in the process, filtered water can pass smoothly; similarly, in the process of backwashing, backwashing water and backwashing air can pass smoothly. In the conventional configuration, the pebbles are divided into four specifications, and the paving method is from bottom to top first big and then small.
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