Electric enhanced internal circulation anaerobic reactor and method thereof

[0054] Example 1

[0055] The COD of a chemical wastewater after pretreatment is 1200-1400mg/L, BOD 5 It is 200-300mg/L, and the B/C ratio is about 0.2.

[0056] An electric-enhanced internal circulation anaerobic reactor of this embodiment includes a reactor body 100. The reactor body 100 is provided with an electrochemical activation detoxification zone 110, a first anaerobic reaction zone 120, and a second anaerobic reaction zone. The reaction zone 130, the precipitation zone 140 and the internal circulation unit 150. The number of electrochemical cell 111 in the electrochemical activation detoxification zone 110 is one, the shell 1113 of the electrochemical cell 111 is a stainless steel mesh (with an accuracy of 100 microns), two graphite electrode plates are built in, and the cathode 1110 uses graphite electrodes. The anode 1111 adopts a graphite electrode, and the middle of the electrode plate is filled with an iron-carbon filler layer 1112 (wherein, the filler particle size in the iron-carbon filler layer is 4-6cm), and an alternating current is applied. The current density is J=3sint, where t is Time, the unit is h, J is the current density at time t, the unit is mA.

[0057] After this embodiment adopts an electrically enhanced internal circulation anaerobic reactor for wastewater treatment, the effluent COD≤650mg/L, BOD 5 ≤125mg/L, compared with the prior art, within the same total residence time, the COD removal rate of highly concentrated toxic wastewater is increased by 10%-20%.

[0058] Example 2

[0059] The basic content of this embodiment is the same as that of embodiment 1, except that the COD of a certain pharmaceutical wastewater after pretreatment is 13162mg/L, BOD 5 It is 3412mg/L, and the B/C ratio is about 0.27.

[0060] An electric-enhanced internal circulation anaerobic reactor of this embodiment includes a reactor body 100. The reactor body 100 is provided with an electrochemical activation detoxification zone 110, a first anaerobic reaction zone 120, and a second anaerobic reaction zone. The reaction zone 130, the precipitation zone 140 and the internal circulation unit 150. The number of electrochemical cells 111 in the electrochemical activation and detoxification zone 110 is 7. The shell 1113 of the electrochemical cell 111 is made of stainless steel mesh (with an accuracy of 500 microns), the cathode 1110 is made of stainless steel electrodes, and the anode 1111 is made of ruthenium, iridium and titanium electrodes. , The electrode plate is filled with iron-carbon filler layer 1112 (wherein, the filler particle size in the iron-carbon filler layer is 2-4cm), and alternating current is applied, the current density is J=2sin(t-π/6), where t is time, the unit is h, J is the current density at time t, the unit is mA.

[0061] In this embodiment, an electrically enhanced internal circulation anaerobic reactor is used for wastewater treatment, and the effluent COD≤3900mg/L, BOD 5 ≤1020mg/L, compared with the prior art, in the same total residence time, the COD removal rate of highly concentrated toxic wastewater is increased by 30%-40%.

[0062] Example 3

[0063] The basic content of this embodiment is the same as that of embodiment 1, except that the COD of a certain tannery wastewater after pretreatment is 2000mg/L, BOD 5 At 800mg/L, the B/C ratio is about 0.4.

[0064] An electric-enhanced internal circulation anaerobic reactor of this embodiment includes a reactor body 100. The reactor body 100 is provided with an electrochemical activation detoxification zone 110, a first anaerobic reaction zone 120, and a second anaerobic reaction zone. The reaction zone 130, the precipitation zone 140 and the internal circulation unit 150. The number of electrochemical cells 111 in the electrochemical activation and detoxification zone 110 is two, the shell 1113 of the electrochemical cell 111 is a stainless steel mesh (with an accuracy of 1000 microns), the cathode 1110 uses graphite electrodes, and the anode 1111 uses graphite electrodes. The plate is filled with iron-carbon filler layer 1112 (wherein, the filler particle size in the iron-carbon filler layer is 1-4cm), and an alternating current is applied. The current density is J=3sint, where t is time, and the unit is h, J Is the current density at time t in mA.

[0065] After using an electrically enhanced internal circulation anaerobic reactor for wastewater treatment in this embodiment, the effluent COD≤200mg/L, BOD 5 ≤80mg/L, compared with the prior art, in the same total residence time, the COD removal rate of high-concentration toxic wastewater is increased by 20%-30%.