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pact process to reduce sludge discharge and recycle activated carbon

A technology of activated carbon and process, which is applied in the field of PACT process, can solve the problems of complicated operation, unfavorable operation cost and high cost of PACT process, and achieve the effect of increasing residence time, improving overall treatment effect and easy operation

Active Publication Date: 2020-05-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the existing activated carbon recycling technologies have the problems of complex operation and high cost, which is not conducive to effectively reducing the operating cost of the PACT process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] This example is used to illustrate the PACT process of the present invention for reducing sludge discharge and recycling activated carbon.

[0052] The basic situation of the wastewater to be treated: the wastewater is produced by an oil refinery, the COD is 550-650mg / L, the BOD is 230-350mg / L, the ammonia nitrogen is 25-35mg / L, the oil content is 16-32mg / L, and the suspended solid content 100-200mg / L.

[0053] according to figure 1 The process flow shown is to treat the wastewater to be treated. The wastewater to be treated is aerated in the aeration tank of the biochemical unit under the joint action of activated carbon and microorganisms. Compared with the system influent, the dosage of fresh powdered activated carbon in the aeration tank is 40mg / L, and the hydraulic retention of the aeration tank The time is 12 hours, and the water temperature in the aeration tank is 20-25°C; the effluent after aeration treatment in the aeration tank enters the secondary sedimenta...

Embodiment 2

[0056] This example is used to illustrate the PACT process of the present invention for reducing sludge discharge and recycling activated carbon.

[0057] The basic situation of the wastewater to be treated: the wastewater is produced by an oil refinery, the COD is 280-400mg / L, the BOD is 130-220mg / L, the ammonia nitrogen is 20-30mg / L, the oil content is 15-25mg / L, and the suspended solid content 100-150mg / L.

[0058] according to figure 1 The process flow shown is to treat the wastewater to be treated. The wastewater to be treated is aerated in the aeration tank of the biochemical unit under the joint action of activated carbon and microorganisms. Compared with the system influent, the dosage of fresh powdered activated carbon in the aeration tank is 30mg / L, and the hydraulic retention of the aeration tank The time is 8 hours, and the water temperature in the aeration tank is 20-25°C; the effluent after aeration treatment in the aeration tank enters the secondary sedimentat...

Embodiment 3

[0061] This example is used to illustrate the PACT process of the present invention for reducing sludge discharge and recycling activated carbon.

[0062] The basic situation of the wastewater to be treated: the wastewater is produced by a chemical enterprise, the COD is 1200-1600mg / L, the BOD is 380-680mg / L, the ammonia nitrogen is 32-42mg / L, the oil content is 18-35mg / L, and the suspended matter content It is 150-300mg / L.

[0063] according to figure 1 The process flow shown is to treat the wastewater to be treated. The wastewater to be treated is aerated in the aeration tank of the biochemical unit under the joint action of activated carbon and microorganisms. Compared with the system influent, the dosage of fresh powdered activated carbon in the aeration tank is 50mg / L, and the hydraulic retention of the aeration tank The time is 30 hours, and the water temperature in the aeration tank is 20-25°C; the effluent after aeration treatment in the aeration tank enters the seco...

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Abstract

Relating to the field of wastewater treatment, the invention discloses a PACT (powdered activated carbon treatment process) process for reducing sludge discharge and recycling activated carbon. The process includes: (1) subjecting wastewater to aeration treatment under the combined action of activated carbon and microorganisms; (2) carrying out precipitation separation on the effluent water of aeration treatment to obtain supernatant and bottom sludge, discharging the supernatant as treatment effluent, and returning the bottom sludge part to step (1); and (3) carrying out sludge reduction and activated carbon recycling treatment on the remaining sludge. The PACT process for reducing sludge discharge and recycling activated carbon provided by the invention integrates remaining sludge reduction treatment and activated carbon recycling on the basis of the traditional PACT process, and therefore has the advantages of low operation cost, greatly reduced sludge discharge, and more flexible operation.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a PACT process for greatly reducing sludge discharge and recycling activated carbon. Background technique [0002] "Activated sludge-powdered activated carbon process" (Powdered Activated Carbon Treatment Process, abbreviated as PACT process) is an improved process of activated sludge process. The interaction with microorganisms in activated sludge increases the removal of pollutants. It is generally believed that the PACT process has the following advantages: (1) Improve the removal effect of refractory organic matter; (2) Improve the ability of the system to resist the impact of poisonous substances; (3) Improve the decolorization effect of the system; (4) Improve the sludge settlement and dewatering performance; (5) ) to improve nitrification reaction efficiency; (6) to shorten the hydraulic retention time of the system; (7) to reduce the amount of foam produced in the aer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 桑军强张超李本高
Owner CHINA PETROLEUM & CHEM CORP
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