A Study for Treatment of BTEX-Contaminated Ground-Water Using Fenton，s Method---Through Off-Site，In-Situ，and On-Site Remediation Studies

[[abstract]]由於石化業的蓬勃發展，填海造陸，增設工廠，帶動經濟的繁榮，原為人煙稀少的市集，如今亦形成了人口聚集的鄉鎮。在鄉村都市化下，除帶來經濟的成長外，對環境的改善及保護要求亦逐漸增加。 因為現地特性的基礎研究係整治復育之參考，本研究採Fenton 法，用5%（vol%）的過氧化氫，對一個受BTEX 污染的現地（已經過土壤氣體抽除（SVE；Soil Vapor Extraction）及空氣吹驅（AS；Air Sparging）前處理），做離場式（off-site）、現地式（in-situ）、現場式（on-site）整治的研究，進一步來探討反應速率、反應速率常數、去除率及整治效益之影響。結果顯示： （1）無論是離場式、現地式、或是現場式，在過氧化氫加入的同時，都會發生短時間的快速降解，然後趨於平緩的反應，而這種現象，在現地式的實驗中，因為土壤的蓄熱而更加明顯。 （2）由於充分攪伴的關係，離場式BTEX 降解反應速率與其濃度無關，而現地式、現場式則因為不可攪拌或靜置的關係，BTEX 降解反應速率與其濃度成正比關係。 （3）無論是離場式、現地式、或是現場式，其BTEX 去除率大小為苯＞甲苯＞間/對-二甲苯＞鄰二甲苯＞乙苯。 由以上三種不同整治方式的研究：5%的過氧化氫與現地BTEX 污染的地下水作用三小時，會有95%以上的去除率。且過氧化氫又有價格低廉、會自行分解成水及氧，對環境不會有衝擊的好處，建議Fenton 法與AS+SVE 搭配使用（空氣吹驅及土壤氣體抽除法整治地下土壤，Fenton 試劑整治地下水），會有事半功倍的效果。[[abstract]]Abstract Factories land reclamation and petrochemical industries have fueled the prosperous development of economy which in turn transforms the sparsely populated countries into cities with dense population The urbanization of countries not only brings economic growth but also enhances calls for the improvement and protection of the environment The main subject of this research is a BTEX-polluted area in a petrochemical industrial park This research is mainly concerned with the remediation by SVE (Soil Vapor Extraction) and AS (Air Sparging) to look into the residual BTEX soil and contamination at small sites in the condition of using 5% hydrogen peroxide for the off-site on-site and in-situ remediation experiments The analysis of the reaction rate reaction-coefficient and removal ratio of these 3 experiments’ is shown as follows: 1 In the off-site on-site or in-site remediation experiments they would find fast degration reaction when the short time hydrogen peroxide contact with Ground-Water BTEX-Contaminated And the reaction slow down later 2 Because of mixture sufficiently The BTEX degration rate is not concerned with concentration in the Off-site remediation experiment For the setting or other reasons reaction rate is related to concentration（higher concentration higher degration rate）in the On-site In-Situ remediation experiments 3 The removal ratio of BTEX were Benzene>Toluene>M/P-Xylene>O-Xylene >Ethyl-Benzene for the off-site on-site and in situ remediation experiments - iii - The in-situ remediation experiment show that 3-hour reaction of 5% hydrogen peroxide in the BTEX-polluted ground water achieves more than 95% removal ratio In addition hydrogen peroxide is cheap and could not damage the environment It is suggested that Fenton，s reagent is connected with AS and SVE remediations It will be more effectiv