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A process for improving land use performance of high-solid anaerobic digested sludge

An anaerobic digestion, high solid content technology, applied in the field of solid waste recycling, can solve the problems of long time aerobic composting, adding a large number of auxiliary materials, producing large odor, etc., to increase sludge treatment capacity, short residence time, cost saving effect

Active Publication Date: 2017-08-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, aerobic composting also has a series of disadvantages such as long time consumption, large floor area, a large amount of odor generated during the process, and the need to add a large amount of auxiliary materials, so it has not been well promoted.

Method used

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  • A process for improving land use performance of high-solid anaerobic digested sludge
  • A process for improving land use performance of high-solid anaerobic digested sludge
  • A process for improving land use performance of high-solid anaerobic digested sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Table 1-1 Analysis of properties of biogas residue discharged from an anaerobic digestion reactor

[0026]

[0027] Put 800g of high-solid biogas residue remaining after the above-mentioned sludge was treated by mesophilic anaerobic digestion into a 3L aerobic reactor for semi-continuous operation. 0.2m 3 / h, SRT8d, feed and discharge 200g per day, about 2 SRTs (16d) run stably. Table 1-2 shows the properties of the reactor discharge at the end of the third and fourth SRTs. It can be clearly seen that the degradation of VS, TKN, TAN, TOC and VFA, the degradation rates of VS are 6.9% and 13.4% respectively; the degradation rate of TKN They were 54.5% and 49.5%; TAN reduction rates were 85.6% and 87.7%; TOC degradation rates were 32.7% and 14.3%; VFA degradation rates were 92.6% and 91.0%.

[0028] Table 1-2 Analysis of the properties of the micro-aerobic reaction output

[0029]

[0030] The phytotoxicity test of the micro-aerobic reaction output and the biogas ...

Embodiment 2

[0034] Table 2-1 Analysis of properties of biogas residue discharged from an anaerobic digestion reactor

[0035]

[0036] Put 800g of high-solid biogas residue remaining after the above-mentioned sludge was treated by mesophilic anaerobic digestion into a 3L aerobic reactor for semi-continuous operation. 0.2m 3 / h, SRT8d, feed and discharge 200g per day, about 2 SRTs (16d) run stably. Table 2-2 shows the properties of the reactor discharge at the end of the third and fourth SRTs. It can be clearly seen that the degradation of VS, TKN, TAN, TOC and VFA, the degradation rates of VS are 6.4% and 7.6% respectively; the degradation rate of TKN They were 44.4% and 39.4%, respectively; TAN reduction rates were 66.1% and 72.3%; TOC degradation rates were 36.5% and 12.6%; VFA degradation rates were 88.1% and 94.1%.

[0037] Table 2-2 Analysis of the properties of the micro-aerobic reaction output

[0038]

[0039] The phytotoxicity test of the microaerobic reaction output and...

Embodiment 3

[0043] Table 3-1 Analysis of the properties of biogas residue discharged from an anaerobic digestion reactor

[0044]

[0045]Put 800g of high-solid biogas residue remaining after the above-mentioned sludge is treated by mesophilic anaerobic digestion into a 3L aerobic reactor for semi-continuous operation. 0.2m 3 / h, SRT8d, feed and discharge 200g per day, about 2 SRTs (16d) run stably. Table 3-2 shows the properties of the reactor discharge at the end of the third and fourth SRTs. It can be clearly seen that the degradation of VS, TKN, TAN, TOC and VFA, the degradation rates of VS are 12.5% ​​and 13.7% respectively; the degradation rate of TKN They were 54.5% and 47.5%, respectively; TAN reduction rates were 82.5% and 83.4%; TOC degradation rates were 12.3% and 3.2%; VFA degradation rates were 45.5% and 28.1%.

[0046] Table 3-2 Analysis of the properties of the micro-aerobic reaction output

[0047]

[0048] The phytotoxicity test of the microaerobic reaction outpu...

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Abstract

The invention belongs to the field of solid waste recycling, and in particular relates to a recycling treatment process for land utilization of high-solid anaerobic digestion sludge. The main steps are: place the high-solids anaerobic digested sludge in micro-aerobic reactors acclimated by 1 to 2 SRTs, provide the operating conditions of medium temperature, trace gas supply and slow stirring, so that the biogas residue can be digested in 4 ‑ Within 8 days, the organic matter is further degraded, the phytotoxicity is reduced, and the land use performance is greatly improved. This technology improves the technical defects of the traditional sludge high-temperature aerobic digestion or aerobic composting process, and realizes the sludge decomposing process with high efficiency and low energy input (medium temperature or normal temperature, trace gas supply and slow stirring conditions). Stabilization and resource utilization, due to the short residence time, high solid content of the feed, and not harsh conditions, the present invention not only has a relatively low reactor cost, but also has low operating costs. Under the premise of energy saving, it can be used for land utilization stable material. The effect and advantages of this process are obvious, and there is a trend of realizing equipment and popularization.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and relates to a process for improving the land use performance of high-solid anaerobic digestion sludge based on mesophilic micro-aerobic. Background technique [0002] Urban sewage treatment plants produce a huge amount of dewatered sludge due to the purification of domestic sewage. At present, the annual collection volume is about 30 million tons, of which 80% have not undergone necessary stabilization treatment. With the increasingly stringent sludge treatment and disposal standards, sludge stabilization has become the trend of sludge treatment in my country in the future. Since more than 80% of sludge in our country has been dewatered, high-solid anaerobic digestion has become a sludge stabilization technology in line with my country's national conditions. Moreover, the process produces biomass energy—biogas, which has certain economic benefits and a good prospect. [0003] However, af...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/10B09C1/08
Inventor 戴晓虎李小伟戴翎翎李宗翰陈阳刘志刚韦妍宏
Owner TONGJI UNIV