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

Active Publication Date: 2013-02-06
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to provide a method for quickly recovering the efficiency of anaerobic treatment of coal chemical wastewater, so as to solve the problems of poor stability and slow recovery of process efficiency after being impacted by anaerobic biological process of coal chemical wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a method for rapidly recovering efficiency of anaerobic treatment of wastewater generated in the coal chemical industry. The method comprises the following steps of: stopping or reducing inflow when an anaerobic reactor suffers from the impact of water, and introducing air into the anaerobic reactor to control the concentration of dissolved oxygen; performing the procedures of aeration stopping, quiescent settling or inflow reduction and inflow recovery; and performing the procedures repeatedly until the concentration of toxic pollutants detained in the anaerobic reactor is reduced to or lower than a normal level, and then restoring a normal continuous inflow condition, so that the anaerobic reactor can reach or even exceed treatment efficiency in a stable running state in a short period of time. The method has the advantages of flexible operation, wide application range, low operation cost and good treatment effect.

Description

1. Technical field [0001] The invention relates to a chemical wastewater treatment method, in particular to a method for quickly recovering the efficiency of anaerobic treatment of coal chemical wastewater, belonging to the field of industrial wastewater treatment. 2. Background technology [0002] Coal chemical wastewater refers to the production wastewater generated in various coal processing processes, including coking wastewater, coal gasification wastewater, coal-to-oil wastewater, etc. Coal chemical wastewater is characterized by extremely complex water composition, containing phenolic compounds, polycyclic and heterocyclic compounds, and toxic and harmful substances such as cyanide, oil, ammonia nitrogen, etc. It is a typical high-concentration organic wastewater that is difficult to biodegrade. Therefore, the use of biotechnology to treat coal chemical wastewater is the most economical and effective means. At present, the biological treatment technology of coal chem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
Inventor 王伟徐瑞捷张静王顺
Owner HEFEI UNIV OF TECH
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