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Volume 39 Issue 6
Jan.  2022
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2021  >  39(6): 72-78
XUE Tong-lai, ZHAO Dong-hui, HAN Fei. SVR WATER QUALITY PREDICTION MODEL BASED ON GA OPTIMIZATION[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(3): 123-127. doi: 10.13205/j.hjgc.202003021
Citation: ZHANG Jia-hui, GONG You-kui. START-UP OF SBR-PN PROCESS AND N2O EMISSION IN SIDE PRETREATMENT OF WASTED SLUDGE BY FREE NITROUS ACID[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(6): 72-78. doi: 10.13205/j.hjgc.202106012
shu

START-UP OF SBR-PN PROCESS AND N2O EMISSION IN SIDE PRETREATMENT OF WASTED SLUDGE BY FREE NITROUS ACID

doi: 10.13205/j.hjgc.202106012

  • Department of Architecture Engineering, Yantai Vocational College, Yantai 264670, China

  • Received Date: 2020-11-15
    Available Online: 2022-01-18
    Abstract
  • The start up of partial nitrification by using free nitrous acid(FNA) to treat activated sludge was studied in a sequencing batch reactor(SBR) treating rural wastewater by recirculating a portion of the sludge through a side-stream sludge treatment unit. FNA is substantially more biocidal to NOB than to AOB. The difference was the highest at the FNA concentration of 0.48 mg/L. With 3.6 L activated sludge treated by 0.48 mg/L FNA for 24 h under anoxic condition each day, the stable partial nitrification in the sequencing batch reactor(SBR-PN) was established after 60 d accumulation, with the NH4+ removal efficiency and the nitrite accumulation rate(NAR) were both above 95%(Stage Ⅱ). The two-step feeding strategy(Stage Ⅲ) was used to replace the one-step feeding in the SBR with the aim to reduce the NO2- accumulation and N2O emission. The results showed that the maximum NO2- accumulation and N2O emission were reduced from(16.4±1.6) mg/L and(0.85±0.09) mg/L to(11.4±1.2) mg/L and(0.28±0.04) mg/L, respectively, with the TN removal efficiency of(64.0±2.5)%, the N2O yield decreased from(7.40±0.99)% to(1.33±0.26)%. Based on the selectivity of FNA on AOB and NOB, the coexistence of high NO2- and NH4+ was prevented by two-step feeding strategy of the SBR, which was beneficial to the establishment of partial nitrification and the reduction of N2O emission. PN/PS value increased from 1.42 in stage Ⅰ to 1.77 and 1.74 in stage Ⅱ and Ⅲ, additionally, SVI increased from(113±12) mL/gVSS to(129±15) mL/gVSS in stage Ⅱ and(122±13) mL/gVSS in stage Ⅲ respectively.
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    • References(25)
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