Device and process for producing methane by sludge removal filtrate

Abstract

The invention discloses a device and a method for producing methane by sludge removal filtrate. The device comprises an anaerobic reactor, wherein the anaerobic reactor is divided into a sludge reaction area, a three-phase separation area and a gas chamber from top to bottom; the sludge reaction area is provided with a conductive carrier layer; a conductive carrier in the conductive carrier layer consists of carbon fibres and carbon black at the mass ratio of (1:1)-(2:1). The carbon fibres and the carbon black are arranged in the anaerobic reactor to serve as the conductive carrier layer, so that electrons are transferred between methanogenic archaea and syntrophism bacteria through electron carriers of hydrogen, methanoic acid or the like, and inter-specific electron transfer can also be performed directly; therefore, more methane producing ways are provided for producing methane bacteria; the conductive carrier layer is fixed to the anaerobic reactor so as not to lose easily along with the outflow of water flow, and the conductive carrier layer can also be in full contact with wastewater so as to improve the methane producing rate; the water penetrating load of the conductive carrier layer is increased by adopting wastewater cycling, and meanwhile, a fluidizing effect of sludge is also improved; therefore, the methane producing efficiency is improved.

Description

technical field [0001] The invention relates to a device and process for producing methane from sludge defiltrate, belonging to the field of environmental engineering. Background technique [0002] With the popularization of urban sewage treatment plants in our country, sludge production continues to increase rapidly. According to the "Statistical Yearbook of Urban Construction", by the end of 2014, the national sludge output had exceeded 105,700t / d (80% moisture content), and the amount of dry sludge had reached 21,140t / d. At present, my country's sewage plants generally use mechanical methods for dehydration, and the average moisture content of sludge is about 80%, while common follow-up treatment and disposal methods such as composting, incineration, landfill, etc. all require moisture content below 60%, in order to further reduce decementation The moisture content of the cake can meet the requirements of subsequent disposal on moisture content. Researchers at home and ab...

AI Technical Summary

Problems solved by technology

Although this method takes actual wastewater as the treatment object, the Fe 3 o 4 It is a nano-particle with a particle size of 40-80nm, which is easy to flow out with the water flow in the continuous flow anaerobic reactor and cause Fe 3 o 4 loss; and the nanoparticle Fe used 3 o 4 , due to its small particle size and low sludge concentration (10g / L) in wastewater, Fe 3 o 4 Insufficient contact with microorganisms affects the efficiency of methane production

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