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研究生:卓伯全
研究生(外文):Cho, Bo-Chuan
論文名稱:以預臭氧程序促進含高氮廢水有機氮氨化及生物可處理性之研究
論文名稱(外文):Enhanced The Ammonification and Biotreatability of High-Strength Organic Nitrogen Wastewater by Pre-Ozonation Process
指導教授:張鎮南張鎮南引用關係
指導教授(外文):Chang Cheng-Nan
學位類別:碩士
校院名稱:東海大學
系所名稱:環境科學系
學門:工程學門
學類:環境工程學類
論文種類:學術論文
論文出版年:1997
畢業學年度:85
語文別:中文
論文頁數:7
中文關鍵詞:丙烯睛生物可處理性有機氮氨化高氮廢水臭氧程序
外文關鍵詞:ABS樹脂Acrylonitrile-Butadiene-Styrene (ABS)acrylonitrileammonificationbiotreatabilityhigh-strength organic nitrogen wastewaterozonation
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於以臭氧程序分解Acrylonitrile及Styrene兩種ABS樹脂廢水中主要有機
氮及苯環類有機物的特性研究顯示,臭氧可以親核性加成反應攻擊
Acrylonitrile氰基(C*N)之C原子及Styrene之乙烯基(C=C),順利地將
Acrylonitrile中之有機氮以零階反應模式予以氨化,低初始pH條件有較
高之有機氮分解速率及較短之半反應完成時間(t1/2),由於高pH條件及添
加鹼度狀態下,相對降低水中臭氧分子之半衰期,其所產生之OH-,HCO3-
及CO32-等陰離子均會捕捉臭氧所溶解之自由基,進而影響Acrylonitrile
中有機氮分解速率及反應途徑。臭氧亦將難溶性之Styrene極化為可溶性
之中間產物,而雖然高鹼度會降低臭氧之氧化能力,影響完全反應之進行
,使臭氧程序無法完全分解ABS廢水中之有機碳及有機氮化合物,惟臭氧
可以刺激非均相中有機碳及有機氮的極化溶解,亦可將溶解相中之有機氮
轉化為胺基酸型態之氮,而提高生物可分解性。以氣泡式呼吸儀對不同預
臭氧處理程序之ABS處理液進行生物活性試驗,顯示經預臭氧處理之ABS廢
水在生物處理過程中,有機氮可完全轉化為氨氮作為微生物細胞合成或碳
化過程中之氮源,並經硝化作用予以氧化,同時可分別提高碳化及硝化過
程之生物活性,進而作為一可行性高的前處理程序,以結合生物處理程序
,達到增加彼此間
The ABS (Acrylonitrile-Butadiene-Styrene) industry is booming in
South Eastern Asian countries and these countries are becoming
the leading producers of ABS in the world. Major raw materials
for manufacturing ABS resins include acrylonitrile and styrene;
both are toxic and highly resistant to biological degradation.
Field data show that the ABS wastewaster contains high
concentrations of COD, organic nitrogen, and high ratios of TKN/
TOC and Org-N/COD as well as high alkalinity of up to 1,500 mg/L
as CaCO3The results indicate that degradation of organic
nitrogen follows zero order reactions for all acrylonitrile
samples. Samples with lower initial pH*s have higher
degradation rates as seen by their higher reaction rate
contants. Based upon the observed zero-order degradation of the
organic nitrogen, the time needed to complete 50% of the
degradation reaction (t1/2) for each sample can be estimated.
The calculated t1/2 values is 18.87 min for the sample with the
lowest initial pH of 4 and decreased with inNernst equation is
used to model the acrylonitrile oxidation process. The modified
Nernst model (ORP universal model) may be applied to simulate
the variation of ORP values and thus can be used for controlling
a proper ozone contact time during the decomposition of
acrylonitrile. The fluctuate dORP/dt profiles were measured
during the polarization stage of styrene. At the completion of
polarization stage, the dORP/dt profiles had a relatively flat
fluctuation. After the ozonation pre-treatment, styrene In the
field ABS wastewater study, we applied ozonation to both raw and
filtered ABS effluent and investigated the profiles of pH, ORP,
BOD5, COD, DOC, and organic nitrogen. Both raw and filtered
samples were adjusted with the COD-ozone rates, i.e. mgCOD/mgO3(
g).L, 19, 38, 56, and 75 for raw and 11, 22, 33, and 44 for
filtered ABS wastewater. The raw ABS contains tremendous
suspended solids, which may be part of the by-products of ABS
polymer fragments. The SS portion may interfere with the
penetration of In raw ABS wastewater ozonation study, the
organic solids were decomposed by ozone and may be released into
solution as either COD or DOC. At the low COD-ozone loading
rates (19 and 38 mgCOD/mgO3(g).L), the COD can be decomposed at
the rate of 21% and 53% respectively. Ozone may increase the
ratio of BOD5/COD, which may imply the biodegradability of
organic matter with the increase from 44% to 65%. The organic
ABS polymer was retardant to biomass before ozonation and had a
low BOD5/COD ratio. In the casThe filtered ABS, i.e. that which
contains only soluble matter in solution, can react with ozone
directly and without any interference. This approach may
improve the ozonation efficiency and save operation cost, yet it
needs more process to take SS from it. In the case of low COD-
ozone loading (11 mgCOD/mgO3(g).L), the COD (and DOC) reduction
rate can only increase from 17% to 39% (and 16% to 22%). After
the conversion of both COD and DOC, the BOD5/COD ratio increases
to 2.1~4.3 times more than that of raAmino acids, which are
released from the complex mixture of ABS polymer and one of the
intermediate products, are the main portion of organic nitrogen
found in solution. The lower COD-ozone loading rate and longer
reaction time may generate more amino acids in organic nitrogen
portion. In solutions, it is believed that organic nitrogen is
difficult to be decomposed to ammonia nitrogen. The amino acids
to organic nitrogen ratio may increase from 8% to 52%~96% after
ozonation. The output amino acids belongThe COD, DOC, BOD5, Org-
N, and total amino acids (TAA as N) concentration variation of
filtered ABS sample reveals a relationship between chemical
items and ORP levels. At initial low ORP level, release was
seldom observed, but when the ORP reached a high level (450 mV),
the COD decreased and BOD5 increased. The observed BOD5/COD
variation of raw ABS effluent also reveals a similar stage-wise
release pattern. For low COD-ozone loading ( 19 mgCOD/O3(g).L )
case, it has a sudden increase at the ORP value o
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