START-UP OF SBR-PN PROCESS AND N<sub>2</sub>O EMISSION IN SIDE PRETREATMENT OF WASTED SLUDGE BY FREE NITROUS ACID

ZHANG Jia-hui; GONG You-kui

doi:10.13205/j.hjgc.202106012

Volume 39 Issue 6

Jan. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2021 > 39(6): 72-78

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

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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

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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

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.
- free nitrous acid,
- sludge treatment,
- partial nitrification,
- nitrous oxide,
- EPS

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References

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