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</script>  </div> </div> <div id="2iuwmay" class="content"><p style="margin-top: 0.63em; margin-bottom: 1.8em; padding: 0px; font-family: "PingFang SC", 微軟雅黑, 微軟雅黑, "Microsoft YaHei", Helvetica, Tahoma, sans-serif; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255);">機(jī)械加工切削廢液中所含主要污染物有油類物質(zhì)(浮油、乳化油等)、表面活性劑、難降解有機(jī)物及部分殘存可溶性金屬或者泥沙，目前國內(nèi)外處理該廢水主要方法有化學(xué)法、物理法、生化法及各方法的聯(lián)用技術(shù)，下面逐個介紹各種方法的主要過程及優(yōu)缺點(diǎn)。</p><p class="ql-align-center" style="margin-top: 0.63em; margin-bottom: 1.8em; padding: 0px; font-family: "PingFang SC", 微軟雅黑, 微軟雅黑, "Microsoft YaHei", Helvetica, Tahoma, sans-serif; text-align: center; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255);"><img src="/data/upload/image/20220622/1655869616990692.png" title="1655869616990692.png" alt="微信圖片_20220505104834.png"/></p><p style="margin-top: 0.63em; margin-bottom: 1.8em; padding: 0px; font-family: "PingFang SC", 微軟雅黑, 微軟雅黑, "Microsoft YaHei", Helvetica, Tahoma, sans-serif; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255);">切削液的預(yù)處理方法</p><p style="margin-top: 0.63em; margin-bottom: 1.8em; padding: 0px; font-family: "PingFang SC", 微軟雅黑, 微軟雅黑, "Microsoft YaHei", Helvetica, Tahoma, sans-serif; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255);">切削廢液由于其成分復(fù)雜，化學(xué)穩(wěn)定性好，故直接處理難度較大，一般需先經(jīng)過預(yù)處理再進(jìn)行后續(xù)處理。預(yù)處理主要是對廢液進(jìn)行破乳，以除去廢液中油包水或者水包油中的油類物質(zhì)。根據(jù)乳化劑的作用的不同，乳化液穩(wěn)定的原因包括界面張力、界面膜的性質(zhì)和界面電荷。乳化廢液的破乳處理過程中可以根據(jù)這些影響因素使其失穩(wěn)而易于處理。下面就逐一介紹破乳的具體方法。</p><p style="margin-top: 0.63em; margin-bottom: 1.8em; padding: 0px; font-family: "PingFang SC", 微軟雅黑, 微軟雅黑, "Microsoft YaHei", Helvetica, Tahoma, sans-serif; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255);">酸析法</p><p style="margin-top: 0.63em; margin-bottom: 1.8em; padding: 0px; font-family: "PingFang SC", 微軟雅黑, 微軟雅黑, "Microsoft YaHei", Helvetica, Tahoma, sans-serif; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255);">通常的酸析是指在酸性條件下，某些物質(zhì)由溶解態(tài)或膠體態(tài)轉(zhuǎn)化為懸浮態(tài)，從而將油類物質(zhì)等從液體中分離出來的方法，該類方法操作簡單，所用藥劑一般為濃硫酸、硝酸等強(qiáng)酸性物質(zhì)，也可用廢酸液代替純的酸性試劑。王浪等人利用硝酸對廢乳化液進(jìn)行破乳處理，結(jié)果COD去除率可達(dá)97.80%，浮油量少，且為后續(xù)的芬頓處理提供了適宜的pH條件。李義久等人利用濃硫酸對電子感光脫膜乳化廢水進(jìn)行酸化破乳，在pH調(diào)至4以下時，COD去除率達(dá)75.2%，廢液清澈透明，沉淀易于分離。</p><p style="margin-top: 0.63em; margin-bottom: 1.8em; padding: 0px; font-family: "PingFang SC", 微軟雅黑, 微軟雅黑, "Microsoft YaHei", Helvetica, Tahoma, sans-serif; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255);">鹽析法</p><p style="margin-top: 0.63em; margin-bottom: 1.8em; padding: 0px; font-family: "PingFang SC", 微軟雅黑, 微軟雅黑, "Microsoft YaHei", Helvetica, Tahoma, sans-serif; color: rgb(51, 51, 51); white-space: normal; background-color: rgb(255, 255, 255);">鹽析法是指向廢水中投加無機(jī)鹽類物質(zhì)至一定濃度，破壞油珠的水化膜，一般常用電解質(zhì)有氯化鈣、氯化鎂、氯化鈉、硫酸鈣、硫酸鋁鉀等等。劉宏用不同的電解質(zhì)對乳化切削廢液進(jìn)行鹽析破乳研究，結(jié)果表明：陽離子電荷越大，破乳效果越好;金屬離子為相同價態(tài)時，其半徑越小，破乳能力越強(qiáng)，這是因?yàn)榻饘匐x子的半徑越小，其電場強(qiáng)度越大，使得油珠擴(kuò)散雙電層的有效厚度減小，其雙電層的電位分布寬度和陡度降低，從而易于破乳。但鹽析法通常效果不如酸化法，而且鹽析法藥劑投加量較大，價格較貴并會帶來大量污泥沉淀，給處理帶來較大麻煩。</p><p style="margin-top: 0.63em; 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