Method for preparing brick from sludge anaerobic digestion biogas residues

Abstract

The invention belongs to the technical field of sludge recovery, and particularly relates to a method for preparing a brick from sludge anaerobic digestion biogas residues. The method comprises the following steps: collecting sludge from a sludge concentration tank, after the anaerobic digestion, drying the digested sludge biogas residues, adding an additive and gangue into the dried biogas residues, wherein the additive is a mixture of coal ash and kaolin, sufficiently crushing the obtained mixture by utilizing a crushing machine, sieving by virtue of a 100-mesh screen, obtaining a brick preparation raw material, mixing the raw material and water to wet the raw material, aging, extruding and forming the mixed material into a green brick, drying the green brick, and firing the green brick into a finished product brick. The method disclosed by the invention is energy-saving, land-saving and simple in operation.

Description

technical field [0001] The invention belongs to the technical field of sludge recycling, and in particular relates to a method for making bricks from sludge anaerobic digestion biogas residue. Background technique [0002] For a long time, China's sewage treatment generally has a tendency of "heavy water and light mud", so that the disposal of urban sludge has become an extremely weak link in environmental protection, which seriously restricts the long-term and stable development of sewage treatment. Therefore, sludge treatment has become an important research direction. The treatment of sludge should follow the principles of "four modernizations", that is, stabilization, harmlessness, reduction and resource utilization. Traditional sludge treatment methods include: Direct landfill, aerobic composting, dry incineration and anaerobic digestion, etc. Among them, direct landfill is a short-term and simple treatment method, but the stability of the sludge is poor, and the leacha...

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Problems solved by technology

[0002] For a long time, China's sewage treatment generally has a tendency of "heavy water and light mud", so that the disposal of urban sludge has become an extremely weak link in environmental protection, which seriously restricts the long-term and stable development of sewage treatment. Therefore, sludge treatment has become an important research direction. The treatment of sludge should follow the principles of "four modernizations", that is, stabilization, harmlessness, reduction and resource utilization. Traditional sludge treatment methods include: Direct landfill, aerobic composting, dry incineration and anaerobic digestion, etc. Among them, direct landfill is a short-term and simple treatment method, but the stability of the sludge is poor, and the leachate pollutes the groundwater source. The part of the organic matter that can be used as a resource causes a waste of resources; aerobic composting realizes the partial recycling of sludge, but a large amount of filler needs to be added during the composting process, which is an incremental process, and the sanitary conditions of the sludge dump are poor; The reduction and stabilization effect of the incineration method is relatively outstanding, but the investment and operation costs are high, and the flue gas generated by incineration will cause secondary pollution; However, the reduction is not complete, and 30% to 40% of the sludge will still exist in the form of anaerobic digested biogas residues

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