Edible oil production sewage treatment system and process

Abstract

An edible oil production sewage treatment process comprises the following steps: S1, adding 0.1-0.4% of a treating agent on the basis of 100% of edible oil production sewage by weight, wherein the treating agent comprises rice hull ash and quick lime; s2, enabling the edible oil production sewage added with the treating agent to pass through a mixed air floatation tank and the added treating agent to be subjected to full mixed air floatation, demulsification, flocculation and phosphorus removal; s3, filtering out solids and adsorbing part of grease from the edible oil sewage subjected to sufficient mixing and air floatation with the added treating agent through a stepped filter bag; s4, removing grease from the filtered edible oil production sewage through an oil collector; and S5, further carrying out solid-liquid separation and water-oil separation through a standing pool. The invention also provides an edible oil production sewage treatment system. Chemical agents do not need to be added, the treated sewage is low in phosphorus content and oil content, the yield of solid precipitates is small, the solid precipitates can be directly used as raw materials of biological fertilizers, the cost is low, and the treatment time is short.

Description

technical field [0001] The invention relates to sewage treatment of edible oil production enterprises, in particular to a sewage treatment system and process for edible oil production. Background technique [0002] Such as figure 1 The sewage treatment process of the edible oil production enterprise shown above, the current sewage treatment adopts the scheme of combining physicochemical and biochemical, and adopts the adjustment of pH value, oil separation, neutralization, air flotation, anaerobic and aerobic treatment processes for wastewater. There are following problems in the process: [0003] 1. The current process is an intermittent treatment method, which takes a long time and requires the construction of multiple large-capacity sewage mixed air flotation tanks, regulating tanks and other infrastructure facilities, which occupy a large area and require high investment; [0004] 2. The main auxiliary materials for sewage treatment include chemical agents such as aci...

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Problems solved by technology

[0003] 1. The current process is an intermittent treatment method, which takes a long time and requires the construction of multiple large-capacity sewage mixed air flotation tanks, regulating tanks and other infrastructure facilities, which occupy a large area and require high investment;

[0004] 2. The main auxiliary materials for sewage treatment include chemical agents such as acid, lime, demulsifier, and flocculant, which are not environmentally friendly;

[0005] 3. The output of sludge is large, and a large amount of sludge is produced while treating sewage. Sludge is a general solid waste, and if it is not properly treated, it will easily cause secondary pollution;

[0006] 4. The current process is a process of centralized and mixed treatment of all sewage, ignoring the advantages of differentiated and classified treatment, and not considering the combination with the previous process, resulting in energy waste and increased disposal costs

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