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Device and process for producing methane by sludge removal filtrate

A methane and sludge production technology, applied in the field of environmental engineering, can solve the problems of affecting methane production efficiency, insufficient contact, small particle size, etc., and achieve the effects of improving methane production efficiency, increasing excess water load, and increasing methane production rate

Inactive Publication Date: 2016-11-23
POWERCHINA ZHONGNAN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Device and process for producing methane by sludge removal filtrate
  • Device and process for producing methane by sludge removal filtrate
  • Device and process for producing methane by sludge removal filtrate

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Embodiment 1

[0035] This embodiment provides a device for producing methane from sludge defiltrate, its structure is as follows figure 1As shown, the device mainly includes an anaerobic reactor and a pipe connected to the anaerobic reactor; this embodiment is an improvement for the anaerobic reactor, and a conductive carrier layer is built in the anaerobic reactor. The anaerobic reactor mainly includes a circular reaction shell 3. In the inner cavity of the reaction shell 3, there are sludge expansion zone 1d, conductive carrier layer 9, sludge suspension zone 1c, gas-liquid-solid three-phase Separation zone 1a, gas chamber 2; a water inlet is provided at the bottom of the reaction shell 3, the water inlet is connected to the water inlet pipe a, and a water distributor 7 is arranged at the water inlet; N1-three-phase separator 11, N2-three-phase separator 12 Located in the three-phase separation zone 1a; the reactor shell 3 is made of plexiglass or FRP, the effective height (that is, the h...

Embodiment 2

[0047] The concentration of suspended solids in the anaerobic reactor is 20g / L, and the steps of using the anaerobic reactor for ultrasonic pretreatment of sludge and dehydration filtrate (COD concentration is 4969mg / L) are as follows:

[0048] The first step: Mix 10mm carbon fiber and carbon black particles with a diameter of 8mm evenly. The carbon fiber is twice the mass of carbon black. Add the mixture of carbon fiber and carbon black to the conductive carrier layer. When the mixture of carbon fiber and carbon black fills up When the height of the conductive carrier layer is 2 / 3, fasten the silk screen;

[0049] The second step: first place the conductive carrier layer in the inoculated anaerobic reactor, put it into the N1-three-phase separator and N2-three-phase separator, then put it into the gas-liquid separator, and finally cover the gas-liquid separator the upper cover;

[0050] Step 3: Turn on the inlet pump to supply the sludge defiltrate with a pH value of 7.2 and...

Embodiment 3

[0056] The suspended solids concentration in the anaerobic reactor is 30g / L, and the steps of using the anaerobic reactor for electrochemical pretreatment of sludge dehydration filtrate (COD concentration is 7829mg / L) are as follows:

[0057] The first step: Mix 5mm carbon fiber and carbon black particles with a diameter of 5mm evenly. The carbon fiber is 1.5 times the mass of carbon black. Add the mixture of carbon fiber and carbon black to the conductive carrier layer. When the mixture of carbon fiber and carbon black fills up When the height of the conductive carrier layer is 2 / 3, fasten the silk screen;

[0058] The second step: first place the conductive carrier layer in the inoculated anaerobic reactor, put it into the N1-three-phase separator and N2-three-phase separator, then put it into the gas-liquid separator, and finally cover the gas-liquid separator the upper cover;

[0059] Step 3: Turn on the inlet pump to supply the sludge defiltrate with a pH value of 6.8 an...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28
CPCC02F3/005C02F3/2813C02F3/2866C02F2203/006C02F2301/043Y02E50/30
Inventor 张海静李勇肖武杜成琼郭沨王展李青熊珊
Owner POWERCHINA ZHONGNAN ENG
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