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Preparation method of iron series additive and method for increasing anaerobically produced methane

An anaerobic methane production and additive technology, applied in waste fuel, fermentation and other directions, can solve the problems affecting the resource utilization of biogas residue and biogas slurry, high treatment and disposal costs, and increased iron dosage, and achieve resource utilization. , the effect of reducing the amount of iron added and operating costs, and promoting the production of methane

Inactive Publication Date: 2018-09-04
NANJING FORESTRY UNIV
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Problems solved by technology

However, the added iron easily reacts with anions, organic or inorganic substances in the reactor to form precipitates, which not only increases the dosage of iron and increases the operating cost, but also affects the resource utilization of biogas residue and biogas slurry
[0003] Surplus sludge is the main by-product of municipal sewage treatment plants, and its treatment and disposal costs can account for up to 50% of the sewage plant's operating costs, becoming a burden on the sewage plant

Method used

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  • Preparation method of iron series additive and method for increasing anaerobically produced methane
  • Preparation method of iron series additive and method for increasing anaerobically produced methane
  • Preparation method of iron series additive and method for increasing anaerobically produced methane

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Embodiment 1

[0056] The present embodiment provides a preparation of iron-based additives and a method for improving anaerobic methanogenesis, which is implemented in the above-mentioned anaerobic digestion device, and specifically includes the following steps:

[0057] After washing the collected food waste with tap water, manually pick out the bones, plastic products, paper towels and other sundries in the food waste, and then heat and mash the food waste to <2mm.

[0058] The collected sludge from the secondary sedimentation tank of the municipal sewage treatment plant was filtered through a 1mm sieve, and then stood at 4°C for 24 hours. After the supernatant was discharged, the sludge was ultrasonically treated with a 20kHz low-frequency ultrasonic generator (1.0 W / mL, 5min). The remaining sludge after ultrasonic treatment was centrifuged with a centrifuge (8000rpm) for 10 minutes to obtain an EPS solution. Then 400mg of FeCl 2 The solid was slowly added to 1L of EPS solution and sti...

Embodiment 2

[0063] The present embodiment provides a preparation of iron-based additives and a method for improving anaerobic methanogenesis, which is implemented in the above-mentioned anaerobic digestion device, and specifically includes the following steps:

[0064] After washing the collected food waste with tap water, manually pick out the bones, plastic products, paper towels and other sundries in the food waste, and then heat and mash the food waste to <2mm.

[0065] The collected sludge from the secondary sedimentation tank of the municipal sewage treatment plant was filtered through a 1mm sieve, and then stood at 4°C for 24 hours. After the supernatant was discharged, the sludge was ultrasonically treated with a 20kHz low-frequency ultrasonic generator (1.0 W / mL, 5min). The remaining sludge after ultrasonic treatment was centrifuged with a centrifuge (8000rpm) for 10 minutes to obtain an EPS solution. Then 400mg of FeCl 2 The solid was slowly added to 1L of EPS solution and sti...

Embodiment 3

[0070] The present embodiment provides a preparation of iron-based additives and a method for improving anaerobic methanogenesis, which is implemented in the above-mentioned anaerobic digestion device, and specifically includes the following steps:

[0071] After washing the collected food waste with tap water, manually pick out the bones, plastic products, paper towels and other sundries in the food waste, and then heat and mash the food waste to <2mm.

[0072] The collected sludge from the secondary sedimentation tank of the municipal sewage treatment plant was filtered through a 1mm sieve, and then stood at 4°C for 24 hours. After the supernatant was discharged, the sludge was ultrasonically treated with a 20kHz low-frequency ultrasonic generator (1.0 W / mL, 5min). The remaining sludge after ultrasonic treatment was centrifuged with a centrifuge (8000rpm) for 10 minutes to obtain an EPS solution. Then 400mg of FeCl 2 The solid was slowly added to 1L of EPS solution and sti...

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Abstract

The invention relates to a preparation method of an iron series additive and a method for increasing anaerobically produced methane, and belongs to the technical field of organic waste treatment. Themethod comprises the following specific steps: (1) using a low frequency ultrasonic generator to treat excess sludge of a municipal sewage treatment plant; (2) using a centrifugal machine to carry outsolid-liquid separation on the treated sludge, and extracting an extracellular polymeric substance (EPS); (3) slowly dissolving ferrous chloride (FeCl2) into the EPS, and stirring to obtain the ironseries additive Fe-EPS; (4) adding the Fe-PES into an organic waste anaerobic digestion reactor with relatively low iron background value, and carrying out a long-term methanogenesis reaction in an intermediate temperature condition; and (5) collecting and analyzing the yield of biogas and the content of methane, and evaluating the operation stability of the reactor. Iron precipitation can be avoided effectively, the efficiency of methanogenesis is improved, and simultaneously, the resource utilization of excess sludge and organic wastes is realized.

Description

technical field [0001] The invention relates to the technical field of organic waste treatment, in particular to a preparation of an iron-based additive and a method for improving anaerobic methane production. Background technique [0002] With the continuous improvement of living and production standards, the amount of organic waste generated is also increasing. Anaerobic digestion process can convert organic waste into bioenergy such as biogas, which is widely used. However, in the process of anaerobic digestion of organic matter with low background iron content such as kitchen waste and straw, the reactor is acidified and the anaerobic methanogenesis process is terminated due to the lack of trace elements. Adding iron can effectively relieve the inhibition of volatile acids (VFAs) and promote methane production. However, the added iron is easy to react with anions, organic or inorganic substances in the reactor to form precipitates, which not only increases the dosage o...

Claims

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Application Information

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IPC IPC(8): C12P5/02
CPCC12P5/023Y02E50/30
Inventor 刘亚利钟婷婷林子增王郑荆肇乾杨文婧
Owner NANJING FORESTRY UNIV
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