Method for realizing synchronous denitrification in membrane bioreactor
A membrane bioreactor and denitrification technology, applied in the field of wastewater biological treatment, can solve problems such as ineffective effects, and achieve the effects of avoiding slow start, fast start, and sufficient theoretical basis
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Embodiment 1
[0013] The inoculated sludge was taken from the anaerobic granular sludge of the wastewater treatment reactor of the Wuxi Citric Acid Plant. NH 4 + -N (in NH 4 Add in the form of Cl) concentration is 68mg / L, NO 2 - -N (as NaNO 2 The concentration is 70mg / L; the pH value is 6.5, the temperature is 25°C, and the rising flow rate is 1.8m / h; semi-continuous operation, one operation cycle is 24h, including 1.0h of water inflow, 22.5h of circulation, and 0.2 of rest. h, effluent 0.3h; no sludge discharge during operation. The results showed that the start-up time of the reactor was 87d; the sludge concentration in the reactor was 12.7g / L, and the Anammox activity in the sludge was 0.19kg / (m 3 d), the color of the sludge changed from black to reddish brown; the total nitrogen removal rate was 82%, NH 4 + -N removal rate is 92%, NO 2 - -N removal rate is 92%; stable operating membrane flux is 5.8L / (m 2 h).
Embodiment 2
[0015] The inoculated sludge was taken from the anaerobic granular sludge of the wastewater treatment reactor of the Wuxi Citric Acid Plant. NH 4 + -N (in NH 4 Add in the form of Cl) concentration is 72mg / L, NO 2 - -N (as NaNO 2 The concentration is 73mg / L; the pH value is 7.5, the temperature is 35°C, and the rising flow rate is 2.3m / h; semi-continuous operation, one operation cycle is 6h, in which the water inlet is 0.5h, the circulation is 5h, and the static is 0.4h. , effluent 0.1h; no sludge discharge during operation. The results showed that the start-up time of the reactor was 70d; the sludge concentration in the reactor was 13.5g / L, and the Anammox activity in the sludge was 0.15kg / (m 3 d), the color of the sludge changed from black to reddish-brown; the total nitrogen removal rate was 69%, NH 4 + -N removal rate is 79%, NO 2 - -N removal rate is 65%; stable operating membrane flux is 4.6L / (m 2 h).
Embodiment 3
[0017] The inoculated sludge was taken from the anaerobic granular sludge of the wastewater treatment reactor of the Wuxi Citric Acid Plant. NH 4 + -N (in NH 4 Add in the form of Cl) concentration is 73mg / L, NO 2 - -N (as NaNO 2 The concentration is 98mg / L; the pH value is 8.0, the temperature is 30°C, and the rising flow rate is 3.0m / h; semi-continuous operation, one operation cycle is 12h, in which the water inlet is 0.5h, the circulation is 11h, and the rest is 0.4h. , effluent 0.1h; no sludge discharge during operation. The results showed that the start-up time of the reactor was 81d; the sludge concentration in the reactor was 14.8g / L, and the Anammox activity in the sludge was 0.12kg / (m 3 d), the color of the sludge changed from black to reddish brown; the total nitrogen removal rate was 63%, NH 4 + -N removal rate is 65%, NO 2 - -N removal rate is 73%; stable operating membrane flux is 3.2L / (m 2 h).
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