高濃度難降解有機廢水低壓濕式催化氧化處理

1、1997年9月ENV I RONM EN TAL SC IEN CESep.,1997高濃度難降解有機廢水低壓濕式催化氧化處理3楊潤昌周書天(湘潭大學環(huán)境工程系,湖南湘潭411105(湘潭大學化學工程系,湖南湘潭411105摘要在濕式空氣氧化法和Fenton 試劑的基礎(chǔ)上,研究了一種新的低壓濕式催化氧化法.該法與濕式空氣氧化法相比,壓力為011-016M Pa ,而后者壓力為315-10M Pa ;溫度小于180;與Fenton 法相比,當H 2O 2 COD (重量比小于112時,對COD 大于14000m g L 的含酚廢水,COD 去除率提高20%以上,試驗證實硫酸在加溫、加壓(011-

2、016M Pa ,104-165條件下對Fenton 試劑除COD 具有協(xié)同作用.用該法還進行了部分染料和農(nóng)藥廢水處理研究.關(guān)鍵詞濕式氧化,Fenton 試劑,催化氧化,有機廢水,廢水處理.3湖南省教委科技攻關(guān)項目收稿日期:1997202226由美國Zi m p ro 公司開發(fā)的濕式空氣氧化法(W et air ox idati on 已成功地用于城市污水污泥、造紙黑液、石油化工等高濃度有毒有害廢水的處理,它一般需高壓和較高溫度的條件,投資費用高.自60年代E isenhauer 研究使用Fen 2ton 試劑處理苯酚廢水和烷基苯廢水之后,Fen 2ton 試劑在工業(yè)廢水處理中的應用研究受到國

3、內(nèi)外的普遍重視,它特別適用于難生物降解或一般化學氧化難以奏效的有機廢水處理,該方法的最大問題是處理成本過高,目前還難以推廣1,2.本研究在上述2種方法基礎(chǔ)上探討一種能有效處理高濃度難降解有機廢水的新方法低壓濕式催化氧化法(L ow p ressu re w et catalytic ox i 2dati on ,簡稱L PW CO ,該法主要是利用硫酸和Fen ton 試劑的協(xié)同作用,使廢水中有機物在較低的溫度和壓力下進行濕式催化氧化、炭化處理,以推進濕式氧化法的工業(yè)進程.1實驗方法及分析111主要設(shè)備儀器和原料成分分析自制不銹鋼低壓反應釜(<116M Pa ,含酚廢水用化學純苯酚配制,

4、98%硫酸、硫酸亞鐵和雙氧水(30%均為化學純.水樣中苯酚采用42氨基胺替比林比色法和L C 26A 高效液相色譜儀(日本分析,COD 用重鉻酸鉀法分析,鐵用401.112實驗方法先用高濃度苯酚進行實驗,然后再用高濃度染料、農(nóng)藥水樣進行實驗.實驗中將一定濃度苯酚、硫酸、硫酸亞鐵和過氧化氫加入反應釜中,再用蒸餾水定容,反應液為釜容積的1 2-1 3(保證液相反應,密封反應釜,加熱升溫升壓,反應后,降溫冷卻取樣分析.2含酚廢水處理結(jié)果與討論211過氧化氫濃度的影響取一定量的含酚水樣(酚6000m g L ,COD =14350m g L ,加入硫酸(控制H 2SO 4濃度為01939m o l L

5、 ,即912%、FeSO 4 7H 2O (使水樣中鐵離子量達1121×10-3m o l 、不同量的H 2O 2.反應在016M Pa (表壓165下恒溫恒壓反應1h ,反應后取樣分析,結(jié)果如圖1所示.由圖1可見,就去除苯酚而言,L PW CO 法與Fen ton 法一般都在85%以上,但對去除COD 而言,在H 2O 2 COD 為012-114范圍內(nèi),L PW CO 法比Fen ton 法的效果要高20%-40%,反應后水樣由白色變?yōu)樽攸S色,水樣中出現(xiàn)黑褐色沉淀,此沉淀一部分沉入水底,一部分浮于水面,隨著H 2O 2 COD 的比值增大,浮于水面的黑褐色圖1H2O2投量與COD

6、、苯酚去除率關(guān)系11L PW CO法酚去除率21Fenton法酚去除率31L PW CO法COD去除率41Fenton法COD去除率懸浮物逐漸增多;在H2O2 COD比值大于114后,Fen ton法對COD的去除率隨H2O2投量的增加而增大較多,而L PW CO法則增加不多,最后2條曲線趨于接近.D evlin3等人研究了水中苯酚的化學氧化機理,可粗略地描述為:苯酚2苯醌2馬來酸2乙醛酸、乙二酸、丙二酸2丙酸、乙酸、甲酸2CO2+ H2O,濃硫酸對纖維素、糖、脂肪碳水化合物有很強的脫水能力,造紙黑液中的主要污染物是木質(zhì)素,木質(zhì)素是以芳香結(jié)構(gòu)為主體含有酚羥基的大分子化合物,在加壓加溫(011-

7、016M Pa,104-165條件下稀硫酸(5%-10%能使其脫氫(脫水、聚合(縮合、炭化4.活性污泥的組分以脂肪結(jié)構(gòu)為主,也具有一定的芳香結(jié)構(gòu),在同等的溫度壓力條件下,稀硫酸(5%-10%也能使其脫氫、聚合、炭化.同樣,在此條件下稀硫酸也能使水中的苯酚、苯醌類有機物脫氫、聚合、炭化.L PW CO法處理含苯酚水時,在H2O2 COD值較低(012-018階段,Fen ton試劑與硫酸的共同作用,使苯酚、苯醌等較大分子有機物脫氫聚合炭化,成為大顆粒從水中沉淀出來,使COD降低.所以與Fen ton相比,L PW CO法對COD的去除率提高很多,達40%左右.在H2O2 COD值較高時(018-

8、210,由于前期Fen ton 試劑與硫酸共同作用,水中絕大部分苯酚、苯醌類大分子有機物已除去,剩下的有機物大部分是小分子的甲酸、乙酸等,由它們構(gòu)成的COD只能靠Fen ton試劑中的羥基自由基的氧化分解作用才能除去.所以,在H2O2:COD比值較高階段L PW CO法與Fen ton試劑法的效果趨于接近,僅相差20%左右.圖1中a點為往含酚廢水中投加H2O2+ Fe2+H2SO4時的COD去除率;b點為只投加H2O2+Fe2+時的COD去除率.由此比較看出硫酸與Fen ton試劑的協(xié)同效應.21 2Fe2+濃度的影響試驗條件基本同211.固定水樣H2O2濃度為01491m o l L,H2O

9、2 COD為1115,只改變Fe2+的濃度,結(jié)果見圖2.圖2Fe2+濃度與COD、苯酚去除率關(guān)系11酚去除率21COD去除率由圖2可見,在L PW CO中Fe2+濃度對酚去除率影響不大,H2O2本身就是強氧化劑,在加溫加壓和H2SO4存在的條件下,其氧化能力本身就很強,很容易破壞苯酚的羥基,即使不加Fe2+,酚的去除率也高達98%,而Fe2+濃度對COD去除率影響較大,未加Fe2+時,雙氧水及硫酸的協(xié)同作用使COD去除率達70%左右,隨著Fe2+濃度增高至016×10-3時,COD去除率增高20%,以后Fe2+增高對COD去除率影響不大,這表明在此條件下Fe2+起到了催化作用,它使過

10、氧化氫催化分解成羥基自由基( O H,羥基自由基具有比雙氧水高得多的氧化電極電位.Fe2+H2OFe3+HO +HO-HO +H+eH2O(標準電極電位2180VH2O2+2H+2eH2O(標準電極電位27環(huán)境科學18卷 1177V 所以,Fen ton 試劑中的H 2O 2比單獨的H 2O 2氧化能力更強,對COD 去除率更高.水中Fe 2+濃度增高有利于Fe 2+與H 2O 2的分子碰撞,發(fā)生催化分解,但Fe 2+達到一定濃度后,這種作用影響就不大了.反應前后水樣中鐵離子用原子吸收分光光度計進行定量分析,結(jié)果表明鐵離子的總量未發(fā)生變化,同時對水樣中黑褐色的沉淀物進行定性分析,也未發(fā)現(xiàn)含鐵,

11、再次證明在L PW CO 法中Fe 2+起的是催化作用.213硫酸投量的影響試驗條件基本同上,鐵離子濃度固定為01604×10-3m o l L ,投入不同量硫酸,進行L PW CO 試驗,結(jié)果見圖3.圖3H 2SO 4濃度與COD 、苯酚去除率關(guān)系11酚去除率21COD 去除率由圖3可見,未投加硫酸時,同樣的加溫加壓條件,Fen ton 試劑對COD 的去除率為6414%(常溫時為56%,投加硫酸后,由于硫酸的脫氫、聚合和炭化作用,其COD 去除率隨硫酸投量的增加而增大,但硫酸的脫氫、聚合和炭化作用對大分子的碳氫化合物(如芳烴有效,而對小分子的甲酸、乙酸則不起作用,故硫酸投量增大到

12、一定量后,由于H 2O 2 COD 值固定,COD 去除率不再增高.對試驗反應前后水樣中的SO 2-4用鋇鹽法分析,SO 2-4總量也未發(fā)生變化,結(jié)果表明H 2SO 4在此起的也是催化作用.214溫度壓力的影響取一定量不同濃度含酚水樣,固定硫酸濃度為01563m o l L ,Fe 2+濃度為01604×10-3L ,H 2O 2濃度為01491m o l L ,在不同溫度壓力下恒溫恒壓反應1h ,冷卻后取樣分析,結(jié)果如圖4.由圖4可見,反應壓力(溫度對COD 去除率影響不顯著,這說明在此條件范圍內(nèi)壓力(溫度不是L PW CO 法的決定因素,決定因素仍然是H 2O 2 COD 的比值

13、.用圖4中壓力為016M Pa 所對應的1、2、3、4條曲線中COD 去除率與圖1中曲線3對應點比較,兩者基本吻合,相差不大,再次說明在一定的壓力(溫度、硫酸濃度、鐵離子濃度、反應時間條件下,影響COD 去除率的主要因素是 H 2O 2 COD 的比值大小.圖4壓力(溫度與COD 去除率的關(guān)系11COD =14350m g L H 2O 2 COD =1116H 2S O 4 COD =314321COD =35870m g L H 2O 2 COD =01481H 2S O 4 COD =115331COD =71750m g L H 2O 2 COD =01232H 2S O 4 COD

14、=017641COD =107600m g L H 2O 2 COD =01155H 2S O 4 COD =01513染料、農(nóng)藥等廢水試驗配制各種濃度的染料、農(nóng)藥等難降解的高濃度廢水,按214條件(固定反應壓力016M Pa ,164進行試驗,結(jié)果見表1.表1L P W CO 法處理染料、農(nóng)藥等廢水試驗結(jié)果水樣濃度 g L -1反應前COD m g L -1反應后COD m g L -1COD 去除率 %活性艷紅5103450720167911亞甲基蘭510515812697514十二烷基硫酸納10102140051547610甲胺磷1110941816438216間苯三酚715116590

15、11129313試驗結(jié)果表明,L PW CO 法處理高濃度難降解有機廢水的效果很好,適用的污染物種類375期環(huán)境科學也較多.4結(jié)束語L PW CO 的作用原理可初步看作是基于加溫加壓下硫酸與Fen ton 試劑的協(xié)同催化作用,適于高濃度難降解有機廢水處理,特別適用于農(nóng)藥、染料、石油化工生產(chǎn)中含硫酸的高濃度有機廢水處理.L PW CO 法處理高濃度難降解有機廢水的適宜條件為:H 2O 2 COD (重量比=012-110,Fe2+=016×10-3m o l L 左右,H 2SO 4=015m o l L 左右,廢水COD >1×104m g L ,操作壓力011-01

16、6M Pa ,溫度104-165.與Fen ton 試劑法相比,本法在H 2O 2 COD =012-018范圍內(nèi)COD 去除率提高40%左右,故將該法作高濃度難降解有機廢水的預處理,然后再進行生化處理,將是一種有效實用的處理工藝.該工藝避免了Fen ton 法H 2O 2消耗過高的問題,廢水中剩下的COD 主要是小分子易降解有機物(如甲酸、乙酸、丙酸等,可用廉價的生化法進行處理.與濕式氧化法(W AO 相比,本法雖然消耗了一些H 2O 2,但操作壓力僅為W AO 法的1 10,設(shè)備投資費大大降低,操作條件較易達到,易于實現(xiàn)工業(yè)化.參考文獻1溫東輝,祝萬鵬.高濃度難降解有機廢水的催化氧化技術(shù)發(fā)

17、展,環(huán)境科學,1994,15(5:882王永儀,楊志華等.廢水濕式催化氧化處理研究進展,環(huán)境科學進展,1995,3(2:353D evlin H R ,H arris I I .M echanis m of the O xidati on of A queous Pheno l w ith D isso lved O xygen ,Ind ,Eng .Fundam .1984,23(4:387-3924Yang R unchang ,Zhou Shutian .H ydraulic and Carboniaing A cti ons of Sulfuric A cid to Straw Pul

18、p and Paper B lack L iquo r .Journal of Environm ental Sciences ,1995,7(1:101-1065楊潤昌,周書天.石油煉廠污水污泥硫酸催化炭化研究.環(huán)境科學,1996,17(4:54-566F raser J A L .H ydrogen Peroxide in M unici pal ,L andfilland Industrial Efluent T reatm ent .Efluent W ater T reat .,1984,24(5:184-188(上接第70頁 圖8制酸尾氣中SO 2濃度波動對SO 2吸收效率的影響固

19、液比:1 10,液氣比:016L Nm 3表2產(chǎn)品質(zhì)量比較項目M nSO 4 H 2O%Fe%pH 國標二級19501008527本產(chǎn)品294158117861GB1622286標準2按GB1622286檢驗標,Fe 超標,這主要是因為產(chǎn)品制取過程未設(shè)置氧化除鐵所致1若設(shè)置專門工序除鐵,用軟錳礦(M nO 2氧化母液中Fe 2+為Fe 3+后再中和及靜置沉淀,然后將母液過濾濃縮,產(chǎn)品質(zhì)量可望達到國家二級標準.3結(jié)論(1軟錳礦經(jīng)還原再吸收SO 2生產(chǎn)M nSO 4 H 2O 具有SO 2吸收效率高、M n 利用率高及產(chǎn)品M nSO 4 H 2O 含量高等特點,用于處理低濃度SO 2是完全可行的1

20、(2所采用的軟錳礦,在最佳操作條件下,還原效率可以保證大于94%1用篩板塔吸收SO 2能保證反應充分、迅速1產(chǎn)品制取不需復雜工藝1因此,該法具有工藝簡單、操作控制方便、便于推廣應用等優(yōu)點1參考文獻1 津羅克諾普1從工業(yè)氣體中回收SO 21北京:化學工業(yè)出版社,1966:962天津化工研究院1無機鹽工業(yè)手冊1北京:化學工業(yè)出版社,1982:1853寧平等1無機鹽工業(yè),1991,2:414南化公司研究院1低濃度SO 2煙氣脫硫1上海:上?？茖W技術(shù)出版社,1981:505H uss A .J .Phys .Chem .,1982,86:422447環(huán)境科學18卷Groundwa ter Pollut

21、ion near W a ste A sh Ponds of Coa l-f ired Power Plan tA Ca se Study for F-Pollution i n Paoche A sh Ponds of Xu-tang Power Plan t,J i angsu Prov i nce.L i L i,H ai H uang(D ep t.of Earth Sciences,N an jing U n i2 versity,N an jing210093,Fahua Zhu(N an2 jing Environm en tal P ro tecti on R esearch

22、In sti2 tu te fo r E lectric Pow er,N an jing210031: Ch in.J.E nv iron.S ci.,18(5,1997,pp.5961 A22di m en si onal po llu tan t tran spo rt m odel fo r groundw ater po llu ti on in the aqu ifer near ash ponds of Xu tang Coal2fired Pow er P lan t w as estab lished in th is p ap er,and selecting F-as t

23、he si m u lating facto r,the variati on s of ground2 w ater hydrau lic heads and F-concen trati on w ere si m u lated.A t last,the po llu ted area and po llu ti on,degree of F-w ere p redicted by the m odel.A cco rding to the si m u lating resu lts,the m odel is reasonab le,reliab le and p racticab

24、le.It p rovides a scien tific m ethod to p redict the po l2 lu ted area and po llu ti on degree cau sed by the w aste ash ponds.Key words:groundw ater po llu ti on,po llu tan t tran spo rt m odel,num erical si m u lati on,po llu2 ti on p redicti on,coal2fired pow er p lan t.A Study of Pulsed Corona

25、D ischarges for M ethlene Chlor ide D estruction.Zheng L ei and J iang Xuanzhen(D ep t.of Chem istry,Zhejiang U n iversity,H angzhou,310027:Ch in.J.E nv i2 ron.S ci.,18(5,1997,pp.6264in th is p ap er,H igh vo ltage p u lsed co rona D is2 charges has been u sed fo r destructi on of m eth2 lene ch lo

26、ride w ith concen trati on of4218m o l L in air.Bo th po sitive and negative p u lse gen2 erato rs w ere tested and found that the po sitive one can give m uch h igher destructi on efficien2 cy than that on the nagetive one.T he value of cap acito rs fo r p u lse fo rm ati on(C pand the m aterial of

27、 electrodes also influence the de2 structi on efficiency.A p acked bed co rona reac2 to r w ith23mm sp hericalB aT i O3p ellets as a catalyst w as u sed in th is exp eri m en ts.En2 hancem en t of CH2C l2destructi on and the con2 versi on of90%w ere dem on strated.It m ay be attribu ted to the p art

28、ial co rona discharge in2 duced by the con tacted po in ts betw een B aT i O3 p ellets,and then the den sity of co rona w as en2 chanced.T he co rona and catalyst com b ined techno logy gives a better destructi on efficiency com p ared w ith that w ithou t B aT i O3catalyst. Key words:p u lse co ron

29、a discharge,destruc2 ti on,CH2C l2,B aT i O3.Co m par ison of Effect for Re m ov i ng M utagen s and I nogan ic Ion s i n TapW a tar by Revese O s-m osis and Nanof iltra tion.L i L ingzh i(D ep t.of Chem.,P ingdingshan T eachers Co llege, H enan,467002,Zhou Rong and W ang Zhan2sheng(D ep t.of Enviro

30、n.Eng.,T singhua U n i.,B eijing100084:Ch in.J.E nv iron.S ci., 18(5,1997,pp.6567In o rder to get sup eri o r drink ing w ater,tap w ater w as treated resp ectively by reverse o s2 m o sis(ROand nanofiltrati on(N Fin the labo rato ry.T he rem oval effects of m u tagen s and i on s by Ro and N F w er

31、e com p ared.T he Am es test resu lts show ed that bo th RO and N F cou ld convert m u tagen icity from po sitive to negative,w h ile the i on s rem oval effects of the RO and N F m em b ranes are differen t,the rem oval rate of one2valence po sitive i on s (N a+,K+by N F is tenp ercen t low er than

32、 that by RO,the rem oval rate of tw o valence po sitive i on s(Ca2+,M g2+is a little low er than that by RO.M o re i on s w h ich are benefi2 cial to hum an health p ass th rough nanofiltra2 ti on m om b rane in to drink ing w ater.Key words:reverse o s m o sis,nanofiltrati on,ad2 vanced w ater,m u

33、tagen s,inogan ic i on s,Am es test.Study on W etD esulphur iza tion w ith Pyrolusite to Produce M nS O4 H2O i n S m elti ng Plan t. N ing P ing,Sun Peish i et al.(D ep t.of Envi2 ron.and Chem.Eng.,Kunm ing U n iversity of Science and T echno logy,Kunm ing 650093:Ch in.J.E nv iron.S ci.,18(5,1997, p

34、p.6870A n additi onal exp eri m en t,in w h ich reduced p yro lu site(m ade in labo rato ryis u sed as ab2 so rp ti on agen t in w et desu lp hu rizati on to p ro2 duce M nSO4 H2O,has been done in a foam tow er at a s m elting p lan t.O p ti m um conditi on s fo r bo th reducti on of p yro lu site a

35、nd ab so rp ti on of SO2are ob tained and p u re of95%M nSO4 H2O has been p roduced by p ri m ary crystalliza2 ti on of the ab so rp ti on m o ther liquo r.Key words:sufu r di ox ide,reduced p yro lu site, w et desu lp hu rizati on,s m elting gas,foam tow2 er.Study on the L ow Pressure W et Ca ta ly

36、tic Ox i-da tion Trea t m en t of H igh Concen tra tion and Refractory Organ ic W a stewa ter.Yang R un2 chang,Zhou shu tian(D ep t.of Environ. Eng.,D ep t.of chem.Eng.X iangtan U n iver2 sity.X iangtan411105:Ch in.J.E nv iron. S ci.,18(5,1997,pp.7174B ased on catalytic w et air ox idati on and Fen2

37、 ton reagen t,a new w et catalytic ox idati on (L PW COm ethod,w h ich requ ires low p res2 su re fo r the treatm en t of h igh concen trati on and refracto ry o rgan ic w astew ater w as stud2 ied.T he m ethod com p ared w ith general catalytic w et air ox idati on,the p ressu re of the treatm en t

38、 is0.1-0.6M Pa,and the latter is 315-10M Pa.In additi on,its tem p eratu re is59NO15HUAN J I N G KEXU E 96 HU AN J I G KEXU E N Spectrophotom etr ic M ethod for the S i ultanem ous D eterm ina tion of Phenols and Aroma tic Am ines in Sewage w ith Extraction - Reextrac2 . tion. L iM eirong, Yuan Cung

39、uang et a l (D ep t. of Chem. Eng. , U n iversity of Pet ro leum , Shandong, 257062 : C h in. J . E nv iron. S ci. , 18 ( 5 , 1997, pp. 7880 T h is p ap er dea ls w ith a m ethod of si u ltane2 m ou s determ ina t ion of p heno ls and a rom a t ic am ines w h ich ex t racted by ether, then reex 2 t

40、racted by 10% N aO H and 10% HC l resp ec2 t ively. T he sen sit ivity is i p roved h igh ly, and m m any k ind s of in terferences is rem oved effi2 cien t ly. Pheno ls of 0. 03- 6. 0 m g L and a ro 2 m a t ic am ines of 01008 - 015m g L can be de2 term ined. Key words: p heno ls, a rom a t ic am i

41、nes, ex t rac2 . no m o re than 180 T he rem ova l of COD by the t rea tm en t is over tw en ty p ercen t s m o re than Fen tons, w h ile, H 2O 2 COD ( w eigh t ra t io less than one po in t tw o a t the cond it ion of p heno l influen t con ten t m o re than 14000m g L of COD. T he ex istence of sy

42、ner2 g ist ic effect fo r COD rem ova l in H 2 SO 4 + Fen 2 ton sy stem under the cond it ion of added p res2 su re and hea t ing ( 011- 0. 6M Pa, 104- 165 w a s verified. It w a s ca rried ou t tha t five k ind s of dye and p est icide w a stew a ter w a s t rea ted u sing the m ethod. Key words: w

43、 et ox id it ion, Fen ton reagen t, ca ta ly t ic ox ida t ion, o rgan ic w a stew a ter, w a stew a ter t rea tm en t. Study on the D etox ica tion Effect of Chroma te Sludge by Red Br ick M ethod w ith Sha le Rock. Clunch. Yang Guang et a l (R esea rch Cen ter of R esou rces Com p rehesive U t ili

44、za t ion Eng. , Chongqing U n iversity 630044 : C h in. J . E nv i2 ron. S ci. , 18 ( 5 , 1997, pp. 7577 T he ch rom a te sludge b rick w a s m ade u sing sha le rock, ch rom a te sludge and clunch a s . m a in m a teria ls W hen d irect ion s fo r p roducing m a teria ls a re 20% of ch rom a te slu

45、dge and 10% of clunch. T he determ ina t ion of w ho le b rick pow der show ed tha t detox ica t ion of C r ( is tho rough and stab le; and determ ina t ion of b rick su rface layer pow ter show ed tha t the leach ing concen t ra t ion of w a ter so lub le C r ( is 1. 16m g L. th rough five yea rs f

46、o llow 2 ing t ra il of test s under the free a ir and sun concen t ra t ion can st ill cond it ion s C r ( ach ieve the standa rd of GB 5086285. T he detox ica t ion effect is m a in ly influenced by k iln tem p era tu re, acid 2a lka li p rop erty of the sy s2 tem , coa l con ten t and aux ilia ry

47、. Key words: ch rom a te sludge, b rick m anufac2 tu re, red b rick m ethod, sha le rock, clunch, detox ica t ion. t ion 2reex t ract ion, doub le 2 aveleng th, sp ec2 w t rop ho tom et ry, ether. The Appl ica tion of Artif ic ia l Neura l Network . in Ch inese Env ironm en ta l Foreca st W ang Y in

48、g and Sang D ayong (D ep t. of A eronau t ia l M anagem en t Eng ineering, T he A ir Fo rce In 2 st itu te of Eng ineering, X ian 710038 , Sun L inyan ( Schoo l of M anagem en t , X ian J iao 2 tong U n iversity, X ian 710049 : C h in. J . E nv i2 ron. S ci. , 18 ( 5 , 1997, pp. 8183 A cco rd ing to

49、 su itab ility of m odels fo r environ 2 m et fo reca st, a m u t ip le layer p ercep t ron envi2 ronm en t fo reca st m odel w a s bu ilt u sing a rt ifi2 cia l neu ra l netw o rk a s a new fo reca st m ethod, w ith w h ich the environm en t ind ices of 2000 w ere fo reca sted ba sed on environm en

50、 ta l da ta and econom ic da ta in 12 yea rs ( 1981- 1992 . Fu tu re st ra teg ies w ere a lso ana lyzed on the ba sis of fo reca sted da ta. Key words: environm en t fo reca st, a rt ificia l neu ra l netw o rk, m u t ip le layer p ercep t ron envi2 . ronm en t fo reca st m odel Da ta Acqu isition for Inven tory Ana lysis in LCA. X i D eli, Peng X iaoyan (D ep t. of Envi2 ron. Eng. , T singhua U n iversity, B eijing 100084 : C h in. J