Efficient sludge resource utilization method

A resource and sludge technology, applied in chemical instruments and methods, sludge treatment, biological sludge treatment, etc., to achieve the effect of reducing phosphorus release, improving efficiency, and increasing phosphorus content

Active Publication Date: 2017-12-05
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1, a kind of method of efficient recycling of sludge

[0034] The remaining sludge from the sewage treatment plant was concentrated by gravity, and the sludge concentration was adjusted to 20g / L, and NaOH and Ca(OH) with a mass ratio of 3:1 were used to 2 The pH value of the sludge was adjusted to 12 with a mixed alkaline agent, and the treated sludge was treated for 24 hours, and then the treated sludge was centrifuged at 6000r / min for 10min for solid-liquid separation. The liquid part is anaerobically digested to produce methane through an upflow anaerobic sludge bed reactor, and the hydraulic retention time is 8-12 days, which is 40-40- Compared with sludge without pretreatment, the gas production of anaerobic digestion increased by 53-65%. The solid part was dried at 105°C for 6 hours, and the dried sludge was ground and pulverized (2mm) and used to adsorb Cu 2+ , compared to samples prepared from raw sludge without pretreatment, Cu 2+ The adsorption c...

Embodiment 2

[0035] Example 2 A method for efficient resource utilization of sludge

[0036] Centrifuge and concentrate the remaining sludge from the sewage treatment plant, adjust the sludge concentration to 40g / L, and use NaOH and Ca(OH) with a mass ratio of 2:1 2 The pH value of the sludge was adjusted to 11.5 by mixing alkaline agents, and then treated at 175°C for 60 minutes, and then the treated sludge was centrifuged at 6000r / min for 10 minutes for solid-liquid separation. The liquid part is anaerobically digested to produce methane through the internal circulation anaerobic reactor, and the hydraulic retention time is 5-10 days, which is 50-75% shorter than the traditional sludge anaerobic digestion tank (the hydraulic retention time is calculated as 20 days). , Compared with untreated sludge, the gas production of anaerobic digestion is increased by 60-70%. The solid part was pyrolyzed at 600°C for 1 hour under a nitrogen atmosphere. After the pyrolysis sample was ground and pulv...

Embodiment 3

[0037]Example 3 A method for efficient recycling of sludge

[0038] Centrifuge and concentrate the remaining sludge from the sewage treatment plant, adjust the sludge concentration to 30g / L, and use NaOH and Ca(OH) with a mass ratio of 2:1 2 The pH value of the sludge was adjusted to 11.5 by mixing alkaline agents, then mechanically treated for 60 minutes, and then the treated sludge was centrifuged at 6000r / min for 10min for solid-liquid separation. The liquid part is anaerobically digested to produce methane through the anaerobic membrane bioreactor, and the hydraulic retention time is 10 days, which is 50% shorter than that of the traditional sludge anaerobic digestion tank (the hydraulic retention time is calculated as 20 days). Traditional anaerobic digestion of sludge, the gas production of anaerobic digestion increased by 80%. The solid part was pyrolyzed at 650°C for 1 hour under a nitrogen atmosphere. The sample obtained by pyrolysis was ground and pulverized (2mm), ...

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Abstract

The invention belongs to the field of sewage treatment and specifically relates to an efficient sludge resource utilization method. The method mainly comprises links of sludge concentration, pretreatment, solid-liquid separation, anaerobic digestion, preparation of a sludge adsorbent and the like. The operation method comprises the following steps: sludge from a sewage treatment plant is firstly concentrated to a proper concentration; pretreatment of calcium and alkaline agents mixing combined with other methods is then carried out; and solid-liquid separation is conducted, the liquid part undergoes anaerobic digestion for production of methane, and the solid part undergoes anhydration or pyrolysis to prepare sludge charcoal. By the pretreatment including the calcium and alkali mixing treatment process, organic substances in the sludge can be released, and those organic substances can be subjected to anaerobic digestion through an effective anaerobic reactor for production of methane. By calcium and alkali mixing, on one hand, most of phosphorus in the sludge can be maintained in sludge solids to reduce release of phosphorus during the pretreatment process, and the content of phosphorus in the prepared sludge charcoal is high. On the other hand, the sludge solids can be activated and modified, and the prepared sludge charcoal has good adsorption characteristic.

Description

Technical field: [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for strengthening sludge resource utilization in sewage treatment plants by combining alkaline agents with other treatment methods. Background technique: [0002] Sludge is a by-product of sewage biological treatment process. Sludge contains a large amount of organic waste, which will cause serious environmental problems if not treated. With the acceleration of urbanization and industrialization in our country, the amount of urban sewage treatment has also increased significantly, followed by a large increase in the sludge generated in the process of sewage treatment. According to statistics, in 2015, the annual output of sludge in my country's urban sewage treatment plants (calculated with a water content of 80%) reached 33.59 million tons, and it is still increasing. It is estimated that by 2020, the output of sludge will exceed 60 million tons. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/04C02F11/12C02F11/10
CPCC02F11/00C02F11/04C02F11/10C02F11/121C02F11/127Y02E50/30Y02W10/40
Inventor 肖本益代勤翟世民郭雪松刘俊新
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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