Biomass high solid anaerobic digestion process for separation and backflow of active sludge

An anaerobic digestion and activated sludge technology, applied in sludge treatment, biological sludge treatment, etc., can solve the problems of long hydraulic retention time, low load, and inability to separate sludge retention time and microorganism retention time, so as to improve utilization Efficiency, increased density, reduced hydraulic retention time effects

Inactive Publication Date: 2012-08-22
TSINGHUA UNIV
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AI Technical Summary

Problems solved by technology

[0007] In order to overcome the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a kind of biomass high solids anaerobic digestion technology that separates and reflows the activated sludge, solves the low load of the anaerobic digestion process, the hydraulic retention time (HRT) is long, Sludge residence time (SRT) and microbial residence time (CRT) cannot be separated, ensuring high load, high stability and high efficiency operation of biomass high solids anaerobic digestion process, and realizing efficient energy utilization of biomass

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  • Biomass high solid anaerobic digestion process for separation and backflow of active sludge
  • Biomass high solid anaerobic digestion process for separation and backflow of active sludge

Examples

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Embodiment 1

[0029] A biomass high-solids anaerobic digestion process for separating and returning activated sludge, comprising the following steps,

[0030] In the first step, add 250ml of kitchen waste into the CSTR anaerobic reactor with a volume of 5L, the feeding time is 30 minutes, the reaction time is 23 hours, and the material is discharged. The material discharge time is 30 minutes, and the total amount of material is 250ml;

[0031] In the second step, the discharge of the anaerobic reactor is centrifuged at a speed of 15000rpm for 15 minutes by a centrifuge, and after centrifugation, it is the supernatant liquid layer, the middle sludge layer and the remaining residue layer at the bottom;

[0032] The third step is to extract the supernatant of the upper layer, filter the remaining residue at the bottom layer, return the sludge layer in the middle to the CSTR anaerobic reactor, and add 250ml of kitchen waste to the anaerobic reactor again;

[0033] The fourth step, react for 23 ...

Embodiment 2

[0036] A biomass high-solids anaerobic digestion process for separating and returning activated sludge, comprising the following steps,

[0037] In the first step, 170ml of fruit and vegetable waste is added to the CSTR anaerobic reactor with a volume of 5L. The feeding time is 29 minutes, the reaction time is 22.5 hours, and the material is discharged. The material discharge time is 32 minutes, and the total material output is 170ml;

[0038] In the second step, the discharge of the anaerobic reactor is centrifuged at a speed of 12000 rpm for 10 minutes by a centrifuge, and after centrifugation, it is the supernatant liquid layer, the middle sludge layer and the remaining residue layer at the bottom;

[0039] The third step is to extract the supernatant of the upper layer, filter the remaining residue at the bottom layer, return the sludge layer in the middle to the CSTR anaerobic reactor, and add 170ml of fruit and vegetable waste to the anaerobic reactor again;

[0040] The...

Embodiment 3

[0043] A biomass high-solids anaerobic digestion process for separating and returning activated sludge, comprising the following steps,

[0044] In the first step, 200ml of straw is added to the CSTR anaerobic reactor with a volume of 5L. The feeding time is 33 minutes, the reaction time is 24 hours, and the material is discharged. The material discharge time is 35 minutes, and the total amount of material is 200ml;

[0045] In the second step, the discharge of the anaerobic reactor is centrifuged at a speed of 14000rpm for 10 minutes by a centrifuge, and after centrifugation, it is the supernatant liquid layer, the middle sludge layer and the remaining residue layer at the bottom;

[0046] The third step is to extract the supernatant of the upper layer, filter the remaining residue at the bottom layer, return the sludge layer in the middle to the CSTR anaerobic reactor, and add 200ml of fruit and vegetable waste to the anaerobic reactor;

[0047] The fourth step, react for 22...

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Abstract

The invention relates to a biomass high solid anaerobic digestion process for the separation and backflow of active sludge, which comprises the following steps of: 1, adding biomass into a high solid anaerobic reactor, and discharging after a reaction; 2, centrifuging the discharged materials by using centrifugal equipment, wherein after centrifugation is performed, an upper layer is a supernatant liquid layer, an intermediate layer is a sludge layer, and a bottom layer is a residual residue layer; 3, allowing the intermediate sludge layer to flow back to the high solid anaerobic reactor, andadding the biomass into the high solid anaerobic reactor; and 4, discharging after the reaction, and circularly performing the steps 2, 3 and 4. By the process, the problems of low loads, long retention period of hydraulic power, incapability of separating the retention period of the sludge from the retention period of microbes and the like in the anaerobic digestion process are solved, the high-load, high-stability and high-efficiency running of the biomass high solid anaerobic digestion process can be ensured, and the high-efficiency energy utilization of the biomass is realized.

Description

technical field [0001] The invention belongs to a biomass high-solid anaerobic digestion process, in particular to a biomass high-solid anaerobic digestion process for separating and recirculating activated sludge. Background technique [0002] In recent years, affected by the shortage of fossil energy resources, severe environmental pollution caused by excessive consumption of fossil energy, and the continuous high price of oil, biomass is currently the fourth largest energy consumption in the world after coal, oil and natural gas. The development and utilization of energy has been widely concerned and highly valued all over the world. [0003] Anaerobic digestion technology can not only reduce the volume and quality of waste, but also provide renewable energy, which is a sustainable waste treatment technology. The use of anaerobic treatment equipment requires less investment, low energy consumption, and biogas energy can be recycled. Anaerobic digestion technology can ef...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04
CPCY02W10/20
Inventor 左剑恶林甲陈晓洁李晶王凯军
Owner TSINGHUA UNIV
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