Apparatus and method for high-efficiency anaerobic biotransformation of petrochemical sludge

Abstract

The invention relates to an apparatus and a method for high-efficiency anaerobic biotransformation of petrochemical sludge, and belongs to the technical field of environmental engineering. The apparatus mainly comprises a hydrothermal pretreatment device, a sludge cooling device, an anaerobic biotransformation reactor and an anaerobic sludge settling tank. The method comprises: carrying out hydrothermal pretreatment, adding a microbial agent-rich bio-membrane assembly, pumping sludge into a sludge anaerobic biotransformation reactor, and carrying out anaerobic digestion, wherein the biogas generated during the anaerobic digestion is stored after dehydration and desulfurization. According to the present invention, with the method, the total volatile solid of the petrochemical sludge can be reduced by more than 50%, the organic pollutant content can be reduced by 50%, and the sludge dewatering performance can be increased by more than 2 times; with the apparatus and the method, the petrochemical sludge is reduced while the pollutants in the sludge are removed, the clean biogas is obtained, the process is simple, the structure of the anaerobic reaction equipment is simple, the functional microorganisms can be enriched, the cost is low, and the great application value can be provided.

Description

technical field [0001] The invention relates to a device and method for high-efficiency anaerobic biological transformation of petrochemical sludge, which is a petrochemical sludge reduction, resource and harmless technology, and belongs to the technical field of environmental engineering. technical background [0002] The residual sludge produced by sewage treatment plants in the petrochemical industry contains a large number of pathogenic bacteria, heavy metals (such as lead, chromium, cadmium, etc.), and toxic and harmful substances that are difficult to degrade such as polychlorinated biphenyls, dioxins, and polycyclic aromatic hydrocarbons, and have poor stability. It is often accompanied by a foul smell, and the content of organic matter in the sludge is low, the biodegradability is poor, and the treatment is difficult. With the improvement of the country's environmental protection requirements, more stringent requirements have been put forward for the treatment of slu...

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Problems solved by technology

However, current studies have found that the anaerobic biochemical conversion efficiency of petrochemical sludge is low, the process is complicated, and the anaerobic digestion process cannot effectively degrade the organic pollutants in petrochemical sludge. The core reason is the lack of efficient anaerobic biological conversion equipment.

After searching the relevant patents related to the method and equipment of sludge anaerobic biotransformation, the results are as follows: The patent (CN201210213810.6) announced a petrochemical sludge reduction method and its treatment device, and reported that ultrasonic and Combined pretreatment of sludge with oxidizing gas, and then anaerobic digestion of sludge, this method can achieve sludge reduction to a certain extent, but there are complex processes, high investment and operating costs, and reactor mass transfer efficiency. Not high, low pollutant reduction rate and other shortcomings; patent CN200510102944.0 uses ultrasonic pretreatment,) and then anaerobic digestion for reduction, this method can reach 25% reduction in the treatment of excess sludge, but petrochemical sludge It is obviously different from ordinary municipal sludge, and this method has a slightly lower degree of sludge reduction, which may not be applicable to petrochemical sludge

Li Haitao et al. (Chemical Environmental Protection, 2013, 33(5): 422-425) studied the anaerobic baffle reactor in the anaerobic digestion of petrochemical residual sludge, and found that the system was unstable and the bioconversion efficiency was low , cannot effectively remove organic pollutants

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