Method for pre-conditioning sludge
US-2020062629-A1 · Feb 27, 2020 · US
Method for enhancing anaerobic digestion based on solid-liquid interface renewal in sludge
US11834359B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11834359-B2 |
| Application number | US-202117484641-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 24, 2021 |
| Priority date | Sep 27, 2020 |
| Publication date | Dec 5, 2023 |
| Grant date | Dec 5, 2023 |
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- Title
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Abstract
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A method for enhancing anaerobic digestion based on solid-liquid interface renewal in sludge is disclosed. The method includes subjecting sludge to a centrifugation, a thermal baking and a redissolution in softened water in sequence to renew a solid-liquid interface in sludge, and subjecting the sludge to an anaerobic digestion to increase methane production from organic matter in the sludge by anaerobic biotransformation.
First claim
Opening claim text (preview).
What is claimed is: 1. A method for enhancing anaerobic digestion based on solid-liquid interface renewal in sludge, comprising subjecting sludge to a centrifugation, a thermal baking, and a redissolution in softened water in sequence to renew a solid-liquid interface in the sludge, and subjecting the sludge to an anaerobic digestion. 2. The method for enhancing anaerobic digestion based on solid-liquid interface renewal in sludge as claimed in claim 1 , wherein the centrifugation comprises centrifuging sludge at a relative centrifugal force of 2,000 to 8,000 g for 5 to 20 minutes, subjecting the sludge to a solid-liquid separation, and collecting residual sludge. 3. The method for enhancing anaerobic digestion based on solid-liquid interface renewal in sludge as claimed in claim 1 , wherein the thermal baking is a treatment with dry hot air at a constant temperature. 4. The method for enhancing anaerobic digestion based on solid-liquid interface renewal in sludge as claimed in claim 3 , wherein the dry hot air is provided by an electricthermal blower or a combustion heating blower; and the thermal baking is performed at a temperature of 80° C. to 105° C. for 30 minutes to 120 minutes. 5. The method for enhancing anaerobic digestion based on solid-liquid interface renewal in sludge as claimed in claim 1 , wherein the redissolution in softened water comprises redissolving the sludge in softened water and mixing, and the softened water is any one selected from the group consisting of deionized water, distilled water, ultrapure water, and water after removal of calcium, magnesium, aluminum and iron ions. 6. The method for enhancing anaerobic digestion based on solid-liquid interface renewal in sludge as claimed in claim 1 , wherein the redissolution in softened water is performed by a stirring at a rotation rate of 200 r/min to 400 r/min for 0.5 to 2 hours.
Assignees
Inventors
Classifications
- C02F9/00Primary
Multistage treatment of water, waste water or sewage · CPC title
by neutralisation; pH adjustment (for degassing C02F1/20; using ion-exchange C02F1/42; for flocculation or precipitation of suspended impurities C02F1/52; for removing dissolved compounds C02F1/58) · CPC title
- C02F11/04Primary
Anaerobic treatment; Production of methane by such processes · CPC title
by centrifugation · CPC title
by heating · CPC title
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- What does patent US11834359B2 cover?
- A method for enhancing anaerobic digestion based on solid-liquid interface renewal in sludge is disclosed. The method includes subjecting sludge to a centrifugation, a thermal baking and a redissolution in softened water in sequence to renew a solid-liquid interface in sludge, and subjecting the sludge to an anaerobic digestion to increase methane production from organic matter in the sludge by…
- Who is the assignee on this patent?
- Univ Tongji, Shanghai Urban Pollution Control Engineering Res Center Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C02F9/00. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Dec 05 2023 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).