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Improved digestion of biosolids in wastewater

A technology of biosolids and anaerobic digestion, which is applied in the field of systems to improve the biodigestion process, and can solve problems such as high infrastructure and operating costs

Inactive Publication Date: 2013-01-16
BCR环境公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These processes are similar to each other in that they all require high capital and operating costs

Method used

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  • Improved digestion of biosolids in wastewater
  • Improved digestion of biosolids in wastewater
  • Improved digestion of biosolids in wastewater

Examples

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Effect test

example 1

[0054] The effectiveness of using chlorine dioxide to reduce pathogen and heterotrophic bacterial populations in municipal sludge was evaluated.

[0055] The use of chlorine dioxide to treat non-digested wastewater sludge can reduce the concentration of fecal coliform bacteria to a level far below the level B standard (<2,000,000 fecal coliform bacteria) within a contact time of less than 15 minutes, which can make the Material meets Class B pathogen reduction requirements prior to digestion. The resulting block of biosolids has no malodor. Examples of fecal coliform reduction at different chlorine dioxide dose rates are listed in Table 1.

[0056] Table 1. Test results of real condition of secondary sludge

[0057]

[0058] *below detection limit

[0059] In this test, chlorine dioxide was generated on-site and injected (at various concentrations) into 100 gpm of sludge flowing through a 4 inch diameter pipe. The pipe length is sufficient to allow a contact time of 10 ...

example 2

[0064]In a second embodiment of the present invention, waste activated sludge (WAS) can be treated with the same or higher dosage as in the first embodiment and with prolonged contact time to achieve a higher degree of oxidation, cell lysis and The release of intracellular material increases the availability of nutrients and thus significantly increases the activity of microorganisms. In a more specific embodiment, the dosage rate of chlorine dioxide is 50-150 mg / liter, and the sludge is allowed to stand for 24 hours. As the chlorine dioxide oxidizes the materials in the sludge, it is reduced to chlorite. Chlorite is also an oxidizing agent, which is further reduced by contact with organic materials. The resulting sludge contained significantly increased amounts of bioavailable material as bacterial feed, but was not characterized by residual disinfection. This second embodiment is especially important when the subsequent digestion process is anaerobic, since methane product...

example 3

[0073] Treatment of non-digested sludge with chlorine dioxide followed by breeding of the material with appropriate organisms under anoxic conditions can improve biogas production. This approach would have the same advantages when used in conjunction with processes that differentially produce or "harvest" hydrogen prior to methanogenesis in typical anaerobic digestion. An example of such hydrogen production is the use in combination with bioelectrically assisted microbial reactors to produce hydrogen gas. An example of such a reactor is the reactor described in US Patent No. 7,491,453. In another embodiment, the invention is a method of generating hydrogen comprising: obtaining a raw sludge, wastewater sample, or other sample containing biodegradable solids, contacting the sample with chlorine dioxide in an amount sufficient to reduce Or eliminate the microorganisms in the sample and destroy the cell wall of the biosolid material, inoculate the sample treated with chlorine di...

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Abstract

A method enhancing biological digestion of wastewater sludge is provided. The method uses chlorine dioxide to accelerate and improve the efficiency of aerobic or anaerobic digestion.

Description

technical field [0001] The present invention relates to a system and process for improving biological digestion processes. In particular, the present invention relates to the use of chlorine dioxide to enhance the microbial activity of specific organisms in aerobic or anaerobic digestion processes associated with wastewater treatment by reducing competing pathogenic or non-pathogenic organisms and mechanically altering the substrate A cell wall (organic material) that facilitates the above-mentioned processes by enabling benign microbial organisms to obtain nutrients for metabolism. Background technique [0002] During the treatment of municipal wastewater, sludge containing a large amount of degradable organic matter and nutrients is produced. Attempts are being made around the world to reuse this sludge clumps or biosolids in a beneficial manner. [0003] The wastewater enters the wastewater treatment plant as influent. This influent typically undergoes some form of tre...

Claims

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Application Information

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IPC IPC(8): C02F11/04C02F1/76C02F11/02
CPCC02F2209/44Y02E50/343C02F11/06C02F9/00C02F3/025C02F2209/04C02F11/122C02F11/127C02F11/02C02F2209/02C02F11/04C02F3/1221Y02E50/30Y02W10/20Y02W30/40Y02W10/10
Inventor 弗雷德里克·P·缪萨瑞
Owner BCR环境公司
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