3.2. Performance of EGSB reactor
The effect of NH4 + –N concentration on the treatment performance
of the EGSB reactor was also investigated. The HRT and
up-flow velocity of the reactor during the whole operation were
controlled at 2.5 d and 1.8 m/h respectively. As shown in Fig. 2,
the operation was divided into 3 periods.
Period 1 (day 0–60): the start-up stage of the EGSB reactor. The
COD concentration in influent was increased stepwise from 2000
to 17,760 mg/L. The OLR reached about 6 kg COD/ (m3 d), while the
COD removal efficiency rose from 73.61% to 93.17% during the initial
three days. In the end, the COD concentration in influent was
increased to 17,760 mg/L; the COD removal efficiency remained
at around 97% in the entire process, indicating that the reactor
was operating in an efficient and stable condition. The microorganisms
inside the system had acclimatized to the changes of COD
concentration in influent and appeared a stable state. It indicates
that the reactor was successfully started-up. In the end of period
1, given the increase of COD concentration in influent, CH4 production
rate increased gradually, and reached to about 0.270 LSTP/h.
The VFAs in effluent increased correspondingly and stabilized
eventually at 10 mmol/L.
3.2. Performance of EGSB reactorThe effect of NH4 + –N concentration on the treatment performanceof the EGSB reactor was also investigated. The HRT andup-flow velocity of the reactor during the whole operation werecontrolled at 2.5 d and 1.8 m/h respectively. As shown in Fig. 2,the operation was divided into 3 periods.Period 1 (day 0–60): the start-up stage of the EGSB reactor. TheCOD concentration in influent was increased stepwise from 2000to 17,760 mg/L. The OLR reached about 6 kg COD/ (m3 d), while theCOD removal efficiency rose from 73.61% to 93.17% during the initialthree days. In the end, the COD concentration in influent wasincreased to 17,760 mg/L; the COD removal efficiency remainedat around 97% in the entire process, indicating that the reactorwas operating in an efficient and stable condition. The microorganismsinside the system had acclimatized to the changes of CODconcentration in influent and appeared a stable state. It indicatesthat the reactor was successfully started-up. In the end of period1, given the increase of COD concentration in influent, CH4 productionrate increased gradually, and reached to about 0.270 LSTP/h.The VFAs in effluent increased correspondingly and stabilizedeventually at 10 mmol/L.
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