【正文】 分析原因，一方面是由于粉煤灰內(nèi)部的封閉孔道在酸性條件下被打開，使粉煤灰的比表面積增大，對染料的吸附性能進(jìn)而得到提高。另一方面，可能是由于莧菜紅染料含有磺酸基，溶于水后呈弱酸性。在酸性條件下，染料分子會由于磺酸基的電離而帶有較弱的負(fù)電荷，唐 山 學(xué) 院 畢 業(yè) 設(shè) 計(jì)26而已有陽離子表面活性劑附著的粉煤灰會吸附大量的正電荷于表面，正負(fù)電荷之間產(chǎn)生較強(qiáng)的靜電引力作用。當(dāng) pH值大于 ，改性粉煤灰對廢水的脫色率降低，可能是由于隨著 pH值的升高，染料分子因電離會產(chǎn)生大量的負(fù)電荷，同時大量的羥基離子吸附在粉煤灰表面，染料和粉煤灰之間形成靜電斥力，從而導(dǎo)致脫色率的降低。莧菜紅水溶液為弱酸性，考慮到對設(shè)備的腐蝕情況等，所以不需要對廢水的 pH值進(jìn)行調(diào)節(jié)。唐 山 學(xué) 院 畢 業(yè) 設(shè) 計(jì)274 結(jié) 論本論文通過大量的實(shí)驗(yàn)，包括對粉煤灰的改性，影響改性粉煤灰吸附廢水的各個因素如粉煤灰用量，攪拌時間，溫度等進(jìn)行了探討，得出了改性粉煤灰處理染料廢水時最佳的工藝條件，得出如下結(jié)論：（1）未改性的粉煤灰對染料廢水有一定的吸附能力，對其進(jìn)行改性后，其吸附能力明顯增強(qiáng)，其脫色率最高可達(dá) %；（2）用濃度為 改性，其對染料廢水的脫色率為最佳；（3）對 50mL濃度為 50mg/L的染料廢水，改性粉煤灰的最佳投入量為 8g/L；粉煤灰投入染料廢水中，在 10min后達(dá)到吸附平衡；溫度對吸附效果的影響不是特別地明顯，就本實(shí)驗(yàn)來說，45℃為最佳；對本染料廢水來說，其初始 pH值不用調(diào)節(jié)，保持在酸性即可。唐 山 學(xué) 院 畢 業(yè) 設(shè) 計(jì)28謝辭經(jīng)過一學(xué)期緊張而忙碌的實(shí)驗(yàn)和準(zhǔn)備論文，我的畢業(yè)論文終于如期的完成了。這段充實(shí)的學(xué)習(xí)和生活經(jīng)歷，給我留下了很多珍貴的記憶。至此謹(jǐn)向所有曾給予我關(guān)心和幫助的人致以最誠摯的謝意！首先，我要感謝我的指導(dǎo)老師孟麗軍老師，從論文選題、實(shí)驗(yàn)方案設(shè)計(jì)、實(shí)驗(yàn)過程、數(shù)據(jù)分析處理到論文的撰寫及修改，老師都給予了全面、細(xì)致的指導(dǎo)。孟老師嚴(yán)謹(jǐn)?shù)闹螌W(xué)態(tài)度、淵博的知識、獨(dú)到的見解和幽默的話語，令我受益頗多。其次，感謝學(xué)校為我們畢業(yè)生做畢業(yè)設(shè)計(jì)提供查詢資料，進(jìn)行實(shí)驗(yàn)等便利的條件，感謝環(huán)化系各位老師及實(shí)驗(yàn)室老師在我們的學(xué)習(xí)和實(shí)驗(yàn)上給予的關(guān)心和幫助。另外，感謝與我在同一實(shí)驗(yàn)室的同學(xué)們，相互支持，相互幫助，共同討論解決問題，一起克服了實(shí)驗(yàn)中的諸多困難。四年的大學(xué)時光轉(zhuǎn)瞬即逝，在此向所有幫助我的人由衷地說聲謝謝，祝大家身體健康，一切順利。最后祝我的母校蒸蒸日上，環(huán)境與化學(xué)工程系的所有老師身體健康，桃李滿園。 唐 山 學(xué) 院 畢 業(yè) 設(shè) 計(jì)29參考文獻(xiàn)[1]王福元,[M].北京:中國電力出版社,1997. 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Study on the Chemical Oxygen Demand (COD) Reduction of Mining Wastewater by Modified Fly Ash [J]. Institute of Earth and Environment, Anhui University of Science and Technology.唐 山 學(xué) 院 畢 業(yè) 設(shè) 計(jì)31外文資料Study on the Chemical Oxygen Demand (COD) Reduction of MiningWastewater by Modified Fly AshZHANG Gang1, GUI Herong1, 2(1 Institute of Earth and Environment, Anhui University of Science and Technology, Huainan232022, China；2 Suzhou University, Suzhou234000, China)AbstractMining wastewater is a sort of industrial wastewater emitted acpanied with the process of coal mining, fly ash is one of the solid wastes thermal power plant emitted. The utilization of fly ash as an adsorbent for the reduction of chemical oxygen demand (COD) from mining wastewater will achieve the aim of waste material handling wastewater. Firstly, the fly ash will be modified by chemical means to promote its adsorption capacity。 then, laboratory experiments are conducted for investigating the COD removal efficiency from mining wastewater in several different conditions (effect of treatment time, adsorbent dose, pH values of the media and agitation speed). The results show that the maximum COD removal efficiency achieved for modified fly ash is % under the optimium coditions. As for the pretreatment of the mining wastewater for prehensive utilization, fly ash, which is low cost and further attaining, will be an ideal pretreatment agent.Keywords: modified fly ash。 mining wastewater。 COD removal efficiency。 adsorbents。 adsorption capacity1 IntroductionChina39。s coal mines mostly distribute in dry areas in the north. According to inplete statistics, 71 percent of the 86 key stateowned mines bear water shortage, 40 percent bear serious water shortage, so the mining areas have been hardly restricted by the shortage of water resources for sustainable development of coal industry。 on the other hand, the mining wastewater volume ranked outside by China39。s coal mines has reached about Gt each year, but the utilization rate is less than 30 percent. Mining activities waste a lot of water, not only cause a great waste of water resources, but also contaminate the surrounding farmland and surface water systems. Mining wastewater is mainly made up of groundwater, groundwater contacts with coal powers and rocks, initiate a series of physical, chemical and biochemical reactions, acpanied with a large number of coal mining wastewater durig the process of mining activities. Practices 唐 山 學(xué) 院 畢 業(yè) 設(shè) 計(jì)32have proved that as long as the proper design, the mining wastewater after purified treatment can absolutely be used for the production water supply and demestic water, not only make full use of water resources, alleviate the contradiction of water shortage in the mining area, but also create a good economic and environmental benefits[1].At present, the acidic mining wastewater treatment technology is mainly focused on neutralization method at home and abroad. But as to the neutralization method, the dosage is fairly big and plicated to operate, and there are mor