Field Test of Methane Fermentation Incorporating with Membrane Module for Sewage Sludge.

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  • 分離膜を複合した下水汚泥のメタン発酵

Abstract

Microorganisms which contribute to the effective production of useful materials as well as substrate decomposition can be kept at a high concentration through the use of a membrane module with a reactor.<br>This paper reports on our experimental results on methane fermentation using a membrane module. The methane fermentation reactor uses charged raw sludge from the suspended solids separating device (which is much the same as the sludge from the primary settling tank) and the concentrated backwash of the biological aerated filter.<br>The reduction rate of volatile suspended solids charged into the methane fermentation reactor increased from 76.8% to 84.8% at a reactor temperature of 25°C, and only the raw slugde from the separating device was charged.<br>When a mixture of the concentrated backwash and the separated sludge from the separating devise were fed to the methane fermentation reactor the reduction rate for volatile suspended solids increased from 52% to 72% at 25°C. Such a high reduction rate of volatile suspended solids can be attributed to the use of the membrane separation system.<br>Stable operation of the membrane module was achieved under the condition that the SS concentration of the inlet liquid was from 20,000 to 25,000 mg·l-1 and the membrane linear velocity was 0.6m·S-1. The recovery of flux was only achieved through back washing.<br>The power consumption for membrane separation was calculated as 2.15KW·h per m3 of the permeant, provided that both the motor efficiency and pump efficiency were 1.0.

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