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style="font-size:14px;">一個(gè)好的設計方案，離不開(kāi)對水質(zhì)的了解；了解廢水的來(lái)源、特性，了解生產(chǎn)工藝，對我們設計方案，選擇處理工藝有著(zhù)極大的幫助。我們策劃收集各類(lèi)工業(yè)廢水來(lái)源、特性及治理方法，希望能供工業(yè)水處理行業(yè)同仁借鑒分享，取長(cháng)補短，一起為我國水處理行業(yè)的發(fā)展獻計獻策。</span></div> <div> <br /> <span style="font-size:14px;">工業(yè)廢水是指工業(yè)生產(chǎn)過(guò)程中排出的廢水，包括工藝過(guò)程用水、機器設備冷卻水、煙氣洗滌水、設備和場(chǎng)地洗滌水等。由于工業(yè)類(lèi)型繁多，而每種工業(yè)又由多段工藝組成，故產(chǎn)生的廢水性質(zhì)完全不同，成分也非常復雜。根據廢水對環(huán)境污染所造成的危害的不同，大致可劃分為固體污染物、有機污染物、油類(lèi)污染物、有毒污染物、生物污染物、酸堿污染物、需氧污染物、營(yíng)養污染物、感官污染物和熱污染等。</span></div> <div> <br /> <div> <span style="font-size:14px;">1.酸堿廢水的特性及其治理方法</span></div> <div> <span style="font-size:14px;">酸性廢水主要來(lái)自鋼鐵廠(chǎng)、化工廠(chǎng)、染料廠(chǎng)、電鍍廠(chǎng)和礦山等，其中含有各種有害物質(zhì)或重金屬鹽類(lèi)。酸的質(zhì)量分數差別很大，低的小于1%，高的大于10%.堿性廢水主要來(lái)自印染廠(chǎng)、皮革廠(chǎng)、造紙廠(chǎng)、煉油廠(chǎng)等。其中有的含有機堿或含無(wú)機堿。堿的質(zhì)量分數有的高于5%，有的低于1%.酸堿廢水中，除含有酸堿外，常含有有酸式鹽。堿式鹽以及其他無(wú)機物和有機物。</span></div> <div> <span style="font-size:14px;">酸堿廢水具有較強的腐蝕性，需經(jīng)適當治理方可外排。<br /> 治理酸堿廢水一股原則是：<br /> （1）高濃度酸堿廢水，應優(yōu)先考慮回收利用，根據水質(zhì)、水量和不同工藝要求，進(jìn)行廠(chǎng)區或地區性調度，盡量重復使用；如重復使用有困難，或濃度偏低，水量較大，可采用濃縮的方法回收酸堿。<br /> （2）低濃度的酸堿廢水，如酸洗槽的清洗水，堿洗槽的漂洗水，應進(jìn)行中和處理。</span></div> <div> <span style="font-size:14px;">對于中和處理，應首先考慮以廢治廢的原則。如酸、堿廢水相互中和或利用廢堿（渣）中和酸性廢水，利用廢酸中和堿性廢水。在沒(méi)有這些條件時(shí)，可采用中和劑處理。</span></div> <div> <br /> <span style="font-size:14px;">2.含汞廢水的特性及其治理方法</span></div> <div> <span style="font-size:14px;">含汞廢水主要來(lái)源于有色金屬冶煉廠(chǎng)、化工廠(chǎng)、農藥廠(chǎng)、造紙廠(chǎng)、染料廠(chǎng)及熱工儀器儀表廠(chǎng)等。從廢水中去除無(wú)機汞的方法有硫化物沉淀法、化學(xué)凝聚法、活性炭吸附法、金屬還原法、離子交換法和微生物法等。一般偏堿性含汞廢水通常采用化學(xué)凝聚法或硫化物沉淀法去處理。偏酸性的含汞廢水可用金屬還原法處理。低濃度的含汞廢水可用活性炭吸附法、化學(xué)凝聚法或活性污泥法處理，有機汞廢水較難處理，通常先將有機汞氧化為無(wú)機汞，而后進(jìn)行處理。</span></div> <div> <span style="font-size:14px;">各種汞化合物的毒性差別很大。元素汞基本無(wú)毒；無(wú)機汞中的升汞是劇毒物質(zhì)，有機汞中的苯基汞分解較快，毒性不大；甲基汞進(jìn)入人體很容易被吸收，不易降解，排泄很慢，特別是容易在腦中積累，毒性最大，如水俁病就是由甲基汞中毒造成的。</span></div> <div> <br /> <span style="font-size:14px;">3.含酚廢水的特性及其治理方法</span></div> <div> <span style="font-size:14px;">含酚廢水主要來(lái)自焦化廠(chǎng)、煤氣廠(chǎng)、石油化工廠(chǎng)、絕緣材料廠(chǎng)等工業(yè)部門(mén)以及石油裂解制乙烯、合成苯酚、聚酰胺纖維、合成染料、有機農藥和酚醛樹(shù)脂生產(chǎn)過(guò)程。含酚廢水中主要含有酚化合物，如苯酚、甲酚、二甲酚和硝基甲酚等。</span></div> <div> <span style="font-size:14px;">酚基化合物是一種原生質(zhì)毒物，可使蛋白質(zhì)凝固。水中酚的質(zhì)量濃度達到0.1~0.2mg\L，魚(yú)肉即有異味，不能食用；質(zhì)量濃度增加到1 mg\L，會(huì )影響?hù)~(yú)類(lèi)產(chǎn)卵，含酚5~10 mg\L，魚(yú)類(lèi)就會(huì )大量死亡。飲用水中含酚能影響人體健康，即使水中含酚質(zhì)量濃度只有0.002 mg\L，用氯消毒也會(huì )產(chǎn)生氯酚惡臭。通常將質(zhì)量濃度為1000 mg\L的含酚廢水，稱(chēng)為低濃度含酚廢水。通常將這類(lèi)廢水循環(huán)使用，將酚濃縮回收后處理?；厥辗拥姆椒ㄓ腥軇┹腿》?、蒸汽吹脫法、吸附法、封閉循環(huán)法等。含酚質(zhì)量濃度在300 mg\L以下的廢水可用生物氧化、化學(xué)氧化、物理化學(xué)氧化等方法進(jìn)行處理后排放或回收。</span></div> <div> <br /> <span style="font-size:14px;">4.含油廢水的特性及其處理方法</span></div> <div> <span style="font-size:14px;">含油廢水主要來(lái)源于石油、石油化工、鋼鐵、焦化、煤氣發(fā)生站、機械加工等工業(yè)部門(mén)。廢水中油類(lèi)污染物質(zhì)，除重焦油的相對密度為1.1以上外，其余的相對密度都小于1。油類(lèi)物質(zhì)在廢水中通常以3種狀態(tài)存在。（1）浮上油，油滴粒徑大于100um，易于從廢水中分離出來(lái)；（2）分散油，油滴粒徑介于10~100 um之間，懸浮于水中；（3）乳化油，油滴粒徑小于10 um，不易從廢水中分離出來(lái)。由于不同工業(yè)部門(mén)排出的廢水中含油濃度差異很大，如煉油過(guò)程中產(chǎn)生廢水，含油量為150~1000mg\L，焦化廢水中焦油含量約為500~800mg\L,煤氣發(fā)生站排出廢水中的焦油含量可達2000~3000 mg\L.因此，含油廢水的治理應首先利用鎘油池，回收浮油或重油，處理效率為60%~80%，出水中含油量約為100~200 mg\L；廢水中的乳化油和分散油較難處理，故因防止或減輕乳化現象。方法之一，是在生產(chǎn)過(guò)程中注意減輕廢水中油的乳化；其二，是在處理過(guò)程中，盡量減少用泵提升廢水的次數，以免增加乳化程度。處理方法通常采用氣浮法和破乳法。</span></div> <div> <br /> <span style="font-size:14px;">5.含氰廢水的特性及其治理方法</span></div> <div> <span style="font-size:14px;">含氰廢水主要來(lái)自電鍍、煤氣、焦化、冶金、金屬加工、化纖、塑料、農藥、化工等部門(mén)。含氰廢水是一種毒性較大的工業(yè)廢水，在水中不穩定，較易于分解，無(wú)機氰和有機氰化物皆為局毒性物質(zhì)，人食入可引起急性中毒。氰化物對人體致死量為0.18g，氰化鉀為0.12g,水體中氰化物對魚(yú)致死的質(zhì)量濃度為0.04~0.1 mg\L。含氰廢水治理措施主要有：（1）改革工藝，減少或消除外排含氰廢水，如采用無(wú)氰電鍍法可消除電鍍車(chē)間工業(yè)廢水。（2）含氰量高的廢水，應采用回收利用，含氰量低的廢水應凈化處理后方可排放?；厥辗椒ㄓ兴峄貧?堿液吸收法、蒸汽解吸法等。治理方法有堿性氯化法、電解氧化法、加壓水解法、生物化學(xué)法、生物鐵法、硫酸亞鐵法、空氣吹脫發(fā)等。其中堿性氯化法應用較廣，硫酸亞鐵法處理不徹底亦不穩定，空氣吹脫法既污染大氣，出水又達不到排放標準，較少采用。</span></div> <div> </div> </div> <br /> </div> <div id="wiugcaq" class="pagination"> <span> <a href='/news/2.html' 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