臭氧催化氧化池更换铝基催化剂的工程应用

Engineering application of ozone catalytic oxidation tank to replace alumina-based catalyst

为解决某炼化公司外排水装置臭氧催化氧化单元污染物去除率低,能耗高的问题,将臭氧催化氧化池原有催化剂(氧化铝基+活性碳棒)更换为某研究院基于炼化公司外排水水质参数所制备的专性催化剂,对更换前后污染物去除率和臭氧剂量进行分析。结果表明:专性催化剂具有良好的晶型和发达的孔隙结构,常态化运行后,更换催化剂后的氧化池COD去除率达到42.98%~62.63%,远高于未更换的氧化池(8.96%~20.64%)。对多介质过滤器进水、臭氧催化氧化池进水、臭氧催化氧化池出水(更换、未换)分别取样测定COD、TOC、UV_(254)和荧光光谱,发现多介质过滤器只可通过截留作用去除分子质量较大的类腐殖质等物质,去除率较低;更换催化剂后臭氧催化氧化池的COD去除率达50.86%、TOC去除率达46.62%、UV_(254)去除率达82.17%、荧光类物质去除率可达96.23%。臭氧催化氧化池出水(更换)B/C值为0.56(臭氧催化氧化池进水B/C值为0.21),经由臭氧催化氧化处理后,出水可生化性提高。常态化运行期间臭氧剂量为:更换催化剂的氧化池1.31~1.68 g·g^(-1)(以COD计),均值为1.58 g·g^(-1),未更换催化剂的氧化池为4.15 g·g^(-1),表明更换催化剂后可显著降低臭氧的消耗。以上结果表明,炼化公司外排水装置更换臭氧催化剂后污染物处理负荷大幅度提高,臭氧消耗量减少,节能减排成效显著。

In order to solve the problem of low pollutant removal rate and high energy consumption in the ozone catalytic oxidation unit of the external drainage device of a refining and chemical company.The original catalyst(alumina base+activated carbon rod) in the ozone catalytic oxidation tank was replaced with a specific catalyst prepared by a research institute based on the water quality parameters of the refining company's external drainage.And the pollutant removal rate and ozone dose were analyzed before and after the replacement.The results show that the specific catalyst has a good crystal form and a well-developed pore structure.After normal operation,the COD removal rate of the oxidation tank after the catalyst replacement could reach42.98%~62.63%,which was much higher than that of the unreplaced oxidation tank(8.96%~20.64%).The water samples from the incoming water of the multi-media filter,the incoming water of the ozone catalytic oxidation tank,and the effluent water of the ozone catalytic oxidation tank(replaced and unreplaced) were taken and their COD,TOC,UV_(254) and fluorescence spectra were tested,respectively.It was found that the multi-media filter could only remove humic substances with higher molecular weight through interception,and the removal rate was low;After replacing the catalyst,the COD,TOC,UV_(254) and fluorescent substance removal rates of the ozone catalytic oxidation tank reached 50.86%,46.62%,82.17% and 96.23%,respectively.The B/C value of the effluent from the ozone catalytic oxidation tank(replaced) was 0.56(the B/C value of the incoming water to the ozone catalytic oxidation tank was 0.21).After catalytic ozonation treatment,the biodegradability of the effluent increased.The ozone dose during normal operation was following:1.31~1.68 g·g^(-1)(calculated by COD),for the oxidation tank with catalyst replacement with an average value of 1.58 g·g^(-1),4.15 g·g^(-1) for the oxidation tank without catalyst replacement,which indicated that the replacement of catalyst could significantly reduce ozone consumption.Above results showed that after replacing the ozone catalyst in the external drainage device of the refining and chemical company,the pollutant treatment load has been greatly increased,the ozone consumption has been reduced,and the energy saving and emission reduction have achieved remarkable results.