Method for rapidly recovering efficiency of anaerobic treatment of wastewater generated in coal chemical industry
A technology for coal chemical wastewater and anaerobic treatment, which is applied in the field of rapid recovery of anaerobic treatment of coal chemical wastewater and chemical wastewater treatment, can solve the problems of slow recovery of process efficiency and poor stability, and achieve good treatment effect, high toxicity resistance, adaptable effect
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Embodiment 1
[0014] Taking typical coal chemical wastewater—coal gas wastewater as an example, a method for quickly recovering the efficiency of anaerobic treatment of coal chemical wastewater in this embodiment is achieved in this way:
[0015] 1. Stable operation stage of the anaerobic reactor: first, homogenize the coal chemical wastewater to be treated, so that the chemical oxygen demand concentration of the coal chemical wastewater entering the anaerobic reactor is controlled between 1500-2500mg / L, phenols Compound concentration is controlled between 300-500mg / L. The homogeneously treated coal chemical wastewater flows into the upflow anaerobic sludge bed reactor for anaerobic digestion treatment. The sludge concentration in the reactor is controlled between 10-20g / L and the temperature is controlled at 35-38 ℃, the hydraulic retention time is controlled at 20-24h, the pH value is controlled between 6.0-8.0, and the system has been running stably for more than 3 months. The removal r...
Embodiment 2
[0020] Steps 1 and 2 of this embodiment are the same as those of Embodiment 1.
[0021] 3. Anaerobic reactor low-oxygen aeration operation stage: reduce the influent flow rate of the upflow anaerobic sludge bed reactor after step 2 to 1 / 5 of the flow rate in step 1, and the chemical oxygen demand concentration of the influent Control the concentration of phenolic compounds at 1500-2500mg / L and 300-500mg / L, open the aeration pipe at the bottom to feed air into the reactor, control the dissolved oxygen concentration at 0.1-2mg / L, and control the aeration time at 1-2h; then close the aeration pipe and run it stably for 2-8h; repeat the water intake and aeration process for two cycles, the water intake flow in the first repeated cycle is 2 / 5 of the flow in step 1, and the second repeated cycle The water flow rate is 3 / 5 of the flow rate in step 1, the chemical oxygen demand of the wastewater retained in the anaerobic reactor is ≤600mg / L, and the concentration of phenolic compounds...
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