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    [標準產品] 紡織印染廢水臭氣處理工程案例參考

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    liqiulei0926 發表于 2019-6-8 17:29:11 | 只看該作者 |閱讀模式 打印 上一主題 下一主題
    紡織印染行業產生廢氣的工序較多,如燒毛、定形、烘干、印花、蒸呢等工序,以及廢水處理過程,都會產生廢氣和粉塵。我國針對紡織印染行業的廢氣排放和控制技術研究尚不成熟,現階段仍執行《大氣污染物綜合排放標準》(GB16297—1996)和《惡臭污染物排放標準》(GB14554—1993)綜合排放標準。由于國家缺乏專門的、針對性的行業標準,使得廢氣處理和監測技術相對較弱。目前,已有部分省份出臺地方標準,如浙江省的《紡織染整工業大氣污染物排放標準》(DB33/962—2015),對廢氣排放作了較嚴格規定。美國、英國和世界銀行有針對紡織印染行業的大氣污染物排放標準,日本、歐盟執行綜合排放標準。我國正組織專家參照國外標準和地方標準編制行業標準,預計新標準將提供紡織印染企業的環保投入成本。以常州為例,原一般不考慮廢水處理過程中產生的廢氣,現已積極開展紡織印染廢氣治理。
    一、工程概況
    常州某印染公司主要產品為針織品,該公司于2013年投資建設了一套印染污水回用處理設施,在印染廢水處理過程中,部分廢水處理單元會產生惡臭氣體。根據對廢水處理站現場勘察,臭氣主要來源于調節池、水解酸化池和污泥池三個單元。為響應政府的號召,提高周圍居民的生活、工作環境質量,須安裝廢氣收集和處理設施,讓處理后的臭氣達標排放。具體廢水處理工藝流程及臭氣控制單元見圖1。

    二、工藝方案
    2.1 臭氣處理工藝流程
    目前,國內外針對紡織印染廢水異味氣體特點,常采用的處理方法有物理凈化法、化學凈化法、生物凈化法及綜合凈化法。項目根據大氣污染物特性(表1)設計臭氣處理工藝流程,采用凈化塔+一級除臭吸附塔+二級除臭吸附塔處理,詳見圖2。

    2.2 主要構筑物和設備
    2.2.1 封閉池蓋
    將臭氣主要產生構筑物進行封閉處理,形成密閉覆蓋空間,使產生的臭氣不能自然外溢,并對封閉覆蓋空間所產生的臭氣進行收集,通過引風機動力牽引至臭氣輸送管道,并輸送至臭氣處理裝置集中處理。
    需密閉的構筑物為調節池、水解酸化池和污泥池。為實現這三個單元池體的整體密閉,本工程蓋板采用膜結構材料,通過反吊形式支承于鋼框架結構上,每池蓋板上設兩個活動式觀察孔了解池內運行情況。
    頂膜結構蓋板尺寸為:調節池26.85 m×8.6 m(注:中間有一座冷卻塔占地不需覆蓋,且覆蓋時需考慮封邊,下同),單座面積220m2,1座;水解酸化池22.2m×10.7m(兩池相鄰,整體覆蓋),單座面積242 m2,2座;污泥池7m×6.7m,單座面積47 m2,2座。
    2.2.2 臭氣輸送系統
    臭氣輸送系統是提供動力將密閉系統產生的臭氣輸送至臭氣處理裝置的系統,由臭氣輸送管路和引風機等組成。管道采用玻璃鋼材質的圓形風管。引風機的選型由風量和風壓確定,具體風量見表2。

    根據曝氣量=風量×110%,計算得風機配置風量應在21067m3/h 左右。管道壓損包括管路、局部、部件等,整套設備壓損小于1000Pa,風機本身壓損小于50Pa。最終確定引風機參數為Q=18000~21000 m3/h,H=1800~2300 Pa,P=11kW,1臺。
    2.2.3 廢氣凈化塔
    廢氣自構筑物產生后,收集輸送至廢氣凈化塔,廢氣中夾帶顆粒物塵埃和部分刺激性氣味的可溶性氣體,凈化塔內水成霧狀向下噴淋,廢氣自下而上流動,氣水相互接觸,顆粒物和可溶性氣態污染物得到凈化。
    噴淋塔的除塵效率與氣液相對流速、霧化效果和流體性質有關。氣液相對速度越大,兩者碰撞越激烈,粉塵被濕潤捕獲效果越好。湯奔發現,粉塵去除率隨噴水量增加而提高,噴水量為20m3/h時,去除率可達82.2%,繼續增加噴水量,去除率提高變緩。黃銀鵬[11]發現粉塵粒徑在10 μm以上時,去除率可達90%,而粒徑在5 μm以下時去除率較低。
    凈化塔尺寸為外徑2000mm,塔高6m,聚丙乙烯材質。循環水泵參數為Q=20m3/h,H=10 m,P=4kW,2臺(一用一備)。
    2.2.4 一級除臭吸附塔
    一級除臭吸附塔填料為活性炭纖維(ACF),多層網狀織物結構,具有活性炭的功能,可吸附各種異味,廢氣自下而上通過多層炭纖維,凈化后空氣排出。ACF是一類具有高效吸附性能的功能性中低模量炭纖維]。
    陳玲[在粘膠基活性炭纖維吸附性能的研究中發現,經過蒸餾水預處理后的粘膠基活性炭纖維對進氣質量濃度為3 mg/L和60 mg/L的吸附平衡量分別為542.31 mg/g 和991.42mg/g。炭纖維的吸附容量較大,適應范圍廣,滿足工程需要。
    一級除臭吸附塔尺寸為外徑2000mm,塔高6 m,聚丙乙烯材質。
    2.2.5 二級除臭吸附塔
    二級除臭吸附塔也為活性炭纖維(ACF),常作深度凈化處理,當一級除臭吸附塔未能達標時,用于污染物的進一步處理。
    二級除臭吸附塔尺寸為外徑2000mm,塔高6m,聚丙乙烯材質。
    3 運行效果分析
    3.1 有組織排放廢氣檢測情況
    該臭氣處理工程完工后,系統運行情況良好,臭氣處理效果達到標準要求,主要污染物硫化氫、氨氣、臭氣去除率分別為76%、79%、45%。具體運行情況見表3。

    3.2 無組織排放廢氣檢測情況
    通過對周邊無組織排放廢氣檢測證明,企業對周邊環境大氣影響不大,在允許范圍內,具體檢測情況見表4。

    四、總結
    紡織印染工業廢氣處理技術針對現有排放標準,能夠滿足標準規定要求。本工程實例表明,廢水處理工藝臭氣經收集后進入“凈化塔+一級除臭吸附塔+二級除臭吸附塔”處理系統,硫化氫、氨氣、臭氣去除率分別為76%、79%、45%,各污染物排放濃度均在對應排放標準范圍內,滿足現有排放標準要求,企業邊界廢氣檢測也符合標準要求。


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