本文選題：A/O1/O2工藝　切入點：A/O1/H/O2工藝　出處：《華南理工大學》2015年碩士論文　論文類型：學位論文

【摘要】：焦化廢水是煤制焦炭、煤氣凈化及焦化產品回收過程中產生的工業(yè)廢水。其中含氮化合物種類豐富,含氮量較高。在新國標要求焦化廢水總氮排放低于20 mg/L的形勢下,很多企業(yè)將面臨著技術改進方面的挑戰(zhàn)。所以研究焦化廢水中總氮的主要來源及其在生物處理工藝中的去除和轉化,可以為總氮減排的工藝優(yōu)化和工程運行提供指導和依據(jù)。首先,為了明確焦化廢水中總氮的主要來源,以A/O1/O2、A/O1/H/O2、O1/H/O2 3個生物處理工藝為案例,統(tǒng)計分析了總氮及5種無機含氮化合物在原水和各生物單元反應器進出水中的濃度變化,研究了組成焦化廢水中總氮的主要組分形態(tài)、所占比例及互相轉化。結果表明:3個廠區(qū)焦化廢水原水中總氮濃度從250 mg/L~620 mg/L不等,主要由氨氮(NH4+-N)、硫氰化物(SCN-)、氰化物(CN-)等組成,氨氮和硫氰化物占總氮比例超過80%,是主要貢獻者。含氮化合物在三種生物處理工藝中的轉化相似,主要包括兩個階段,第一階段,硫氰化物、氰化物在一級好氧處理過程基本轉化為氨氮;第二階段,氨氮在二級好氧處理過程中經亞硝化再硝化最終轉化為硝酸鹽。而后為了研究主要含氮化合物氨氮、硫氰化物、氰化物及其他污染物COD、揮發(fā)酚、硫化物在生物處理工藝中的降解,以調試運行階段的天津天鐵煉焦廠O1/H/O2焦化廢水處理工藝為研究對象,研究了各單元反應器對主要含氮化合物氨氮(NH4+-N)、硫氰化物(SCN-)、氰化物(CN-)及其他污染物COD、揮發(fā)酚、硫化物的去除效果并分析其原因。結合模擬實驗研究了好氧反應中這些污染物的好氧降解與工藝指標污泥沉降比(SV30)、水力停留時間(HRT)的關系,并分析了微生物對這些污染物的降解先后順序。結果表明:在O1/H/O2工藝中,O1反應器對SCN-、氰化物、COD、揮發(fā)酚、硫化物的去除率均高于90%,同時SCN-、氰化物被轉化為氨氮。在O2反應器中,影響硝化過程的因素包括氨氮濃度、亞硝酸根濃度、溫度、pH等,當氨氮濃度380 mg/L~400mg/L時,控制溫度23~27℃、pH為7.8~8.3條件下,調試運行23天實現(xiàn)氨氮的完全硝化,。另外,在模擬含氮化合物的好氧降解實驗中,在水質指標COD、SCN-濃度為4465mg/L、1238 mg/L狀況下,實驗條件為溫度17~19℃、pH 7~7.5、溶解氧1~5 mg/L、SV30為30%,連續(xù)曝氣50.5 h時實現(xiàn)COD、SCN-去除率達90%、99%。并且,微生物優(yōu)先降解酚類、氰化物、硫化物,隨著毒性抑制作用的降低,微生物開始降解SCN-,當SCN-完全降解時,COD也降低到最低點。
[Abstract]:Coking wastewater is a kind of industrial wastewater produced in the process of coal coking, gas purification and coking product recovery, in which nitrogen compounds are abundant and nitrogen content is high. Under the new national standard, the total nitrogen discharge of coking wastewater is less than 20 mg/L. Many enterprises will face technical improvement challenges. Therefore, the main sources of total nitrogen in coking wastewater and their removal and conversion in biological treatment processes are studied. It can provide guidance and basis for the process optimization and engineering operation of total nitrogen emission reduction. First, in order to determine the main sources of total nitrogen in coking wastewater, take the biological treatment process A / O _ 1 / O _ 2 / A / O _ 2 / O _ 2 / O _ 1 / H / O _ 2 as an example. The concentration changes of total nitrogen and five inorganic nitrogen compounds in raw water and in the inlet and outlet water of each bioreactor were analyzed statistically. The main components of total nitrogen in coking wastewater were studied. The results showed that the concentration of total nitrogen in raw water of coking plant wastewater ranged from 250 mg/L~620 mg/L to 250 mg/L~620 mg/L, mainly composed of ammonia nitrogen (NH _ 4-N _ 4), sulfur cyanide (SCN-N), cyanide (CN-N), etc. Ammonia nitrogen and thiocyanate account for more than 80% of total nitrogen, and they are the main contributors. The conversion of nitrogen-containing compounds in the three biological treatment processes is similar, including two stages, the first stage, the sulfur cyanide, Cyanide is basically converted to ammonia nitrogen during primary aerobic treatment; in the second stage, ammonia nitrogen is converted to nitrate by nitrification and denitrification during the second stage of aerobic treatment. Then, in order to study the main nitrogen-containing compounds, ammonia nitrogen, sulfur cyanide, Degradation of cyanide and other pollutants such as COD, volatile Phenol and Sulfide in Biological treatment process. The treatment process of O 1 / H / O 2 coking wastewater from Tianjin Tiantie Coking Plant was studied. The effects of various unit reactors on NH _ 4-N _ 4, sulfur cyanide (SCN-N), cyanide (CN-) and other pollutants, such as COD, volatile phenol, were studied. The relationship between aerobic degradation of these pollutants in aerobic reaction and sludge sedimentation ratio (SV30) and HRT (HRT) was studied. The results showed that the removal rate of SCN, cyanide COD, volatile phenol and sulphide in O 1 / H / O 2 reactor was higher than 90%, and SCN and cyanide were converted to ammonia nitrogen in O2 reactor. The factors influencing nitrification process include ammonia nitrogen concentration, nitrite concentration, temperature and pH, etc. When ammonia nitrogen concentration is 380 mg/L~400mg/L, the control temperature is 23 ~ 27 鈩，

本文編號：1636500