Received date: 2004-08-23
Revised date: 2004-08-23
Online published: 2010-10-01
Coal gasification wastewater is of high strength. It is difficult to obtain satisfactory effluent from the bio-treatment. Ozonation is an important way for the advanced wastewater treatment. But the removal of COD and NH3 - N by ozonation alone is too expensive. This research mainly focuses on the characteristics of wastewater under lower ozone doses. Experimental result shows that although pH value of wastewater affects the effectiveness, the wastewater can be decolored by low ozone dose (160 mg/L). It is indicated that 0.44 ~ 0.64 mg COD can be removed by per mg O3. BOD, COD and pH show that 240 mg/L of O3 is the best dose for the following bio-treatment. Low ozone dose cannot removal NH3 - N whether the pH value of the wastewater is 7 or 9. From the analysis of molecular-weight distribution, it is found that low dose ozone have two effects include decomposition and polymer-ization on the wastewater composition. This characteristic is important for selecting the following treatment process
Key words： coal gasification wastewater; ozonation; coagulation
Zhang Wenqi, Ma Jun, Liu Zenghe, Sun Shiquan . Ozonation of secondary effluent of coal gasification wastewater[J]. Industrial Water Treatment, 2005 , 25(1) : 33 -36 . DOI: 10.11894/1005-829x.2005.25(1).33
[1] Zhang Min, et al. Coke plant wastewater treatment by fixed bio-film system for COD and NH3-N removal[J]. Water Research, 1998,(2): 519-527
[2] Moerman W H, et al. Ozonation of activated sludge treated carbonization wastewater[J]. Water Research, 1994, (8): 1 791 - 1 798
[3] Calvosa L, et al. Ozone oxidation of compounds resistant to biological degradation[J]. Water Research, 1991, (8) :985 -993
[4] Lin Chikang, et al. Enhanced biodegradation of petrochemical wastewater using ozonation and BAC advanced treatment system[J]. Water Research, 2001, (3): 699- 704
[5] Singer P C, Zilli W B. Ozonation of ammonia in wastewater[J].Water Research, 1975, (9): 127-134
[6] Urs von Gunten. Ozonation of drinking water: Part 1 Oxidation kinetics and product formation[J]. Water Research, 2003, (7): 1 443-1 467
/
| 〈 |
|
〉 |
津公网安备 12010602120337号