污泥减量化的高浓度废水作为碳源的原位生化处理

In-situ Biochemical Treatment of High-Concentration Wastewater from Sludge Reduction As A Carbon Source

为了实现污泥减量化和弥补污水处理厂污水碳源不足,本文调查了臭氧与机械耦合工艺破解剩余污泥的溶解效率和产生高浓度污水的特性,使用序批式活性污泥反应器(SBR)进一步调查高浓度废水和碳源较低的市政污水混合共同生化处理的可行性以及出水水质。实验结果表明,臭氧与机械耦合工艺可释放出大量有机物污染物,在最佳臭氧投加量100 mg O_(3)/g MLSS、搅拌速度800 r/min时,混合泥水的MLSS由7500.0 mg/L下降到3851.2 mg/L,污泥的溶解效率为48.7%,其溶解性化学需氧量(SCOD)、总磷(TP)、总氮(TN)和氨氮(NH_(4)^(+)-N)分别由原来的28.0、0.8、11.0、2.0 mg/L增加到3086.0、24.5、144.3、48.8 mg/L。将这样高浓度污水视为碳源,回到系统,与低浓度的市政污水10:1的体积加以混合,其水质分别为COD:500.0 mg/L、TP:6.0 mg/L、TN:60.0 mg/L和NH_(4)^(+)-N:51.0 mg/L,经过好氧生化反应后,出水水质可达到COD:33.7 mg/L、TP:1.4 mg/L、TN:14.6 mg/L和NH_(4)^(+)-N:2.2 mg/L,去除率分别为93.3%、76.7%、75.7%和95.7%,从而说明,臭氧与机械搅拌耦合破解污泥的高浓度废水,不仅可以实现城市污水厂污泥减量化,而且还可以作为碳源,促进污水的有效处理,是未来污水厂污泥减量化自身消纳的一个重要发展方向。

To address the insufficient carbon source in wastewater treatment plant effluents and achieve sludge reduction,this study investigates the efficiency of the ozone-mechanical coupling process in treating residual sludge and the characteristics of the resulting high-concentration effluent.Additionally,the feasibility of combined biochemical treatment of high-concentration wastewater and municipal wastewater with a low-carbon source using a Sequencing Batch Reactor(SBR)was examined,along with the resulting effluent quality.The experimental results demonstrate that the ozone mechanical coupling process effectively releases a significant number of organic pollutants.At the optimal ozone dosing of 100 mg O_(3)/g MLSS and a mixing speed of 800 r/min,the MLSS of the mixed sludge water was reduced from 7500.0 mg/L to 3851.2 mg/L.The dissolution efficiency of the sludge was 48.7%,with its dissolved chemical oxygen demand(SCOD),Total Phosphorus(TP),Total Nitrogen(TN),and Ammonia Nitrogen(NH_(4)^(+)-N)increasing from 28.0 mg/L,0.8 mg/L,11.0 mg/L,and 2.0 mg/L to 3086.0 mg/L,24.5 mg/L,144.3 mg/L,and 48.8 mg/L,respectively.Considering such high-concentration wastewater as a carbon source,and reintroducing it to the system mixed at a volume ratio of 10:1 with low-concentration municipal wastewater,the resulting water quality was:COD of 500.0 mg/L,TP of 6.0 mg/L,TN of 60.0 mg/L,and NH_(4)^(+)-N of 51.0 mg/L.After aerobic biochemical processing in the SBR,the effluent quality reached COD of 33.7 mg/L,TP of 1.4 mg/L,TN of 14.6 mg/L,and NH_(4)^(+)-N of 2.2 mg/L,with removal rates of 93.3%,76.7%,75.7%,and 95.7%,respectively.These findings suggest that the combination of ozone treatment and mechanical stirring for high-concentration wastewater not only enables sludge reduction in municipal wastewater treatment plants but also serves as an effective carbon source,facilitating sewage treatment.This approach signifies a promising direction for future developments in sludge reduction and self elimination in wastewater treatment facilities.