Laver processing wastewater treatment facility and method capable of realizing ultra-clean discharge

Abstract

The invention discloses a laver processing wastewater treatment facility and method capable of realizing ultra-clean discharge. The treatment facility comprises a water inlet regulating tank, a primary treatment unit, a secondary treatment unit and a tertiary treatment unit, wherein the primary treatment unit comprises a coarse screen, a fine screen, a grit chamber and a first coagulation air floatation tank which communicate with one another in sequence; the secondary treatment unit comprises a hydrolysis acidification pool and an MBR pool which communicate with each other in sequence; the lower part of the MBR pool is externally connected with a return pipe, and the return pipe is used for returning a mud-water mixed solution in the MBR tank to the hydrolysis acidification tank; the tertiary treatment unit comprises a reverse osmosis system, an electrocatalytic oxidation reaction tank and a second coagulation air floatation tank which communicate with one another in sequence; and a water inlet of the reverse osmosis system communicates with a water outlet of the MBR pool, and a concentrated water outlet communicates with a water inlet of the electrocatalytic oxidation reaction tank. A corresponding treatment process is designed according to the characteristics of pollutants in the laver processing wastewater, and the process has the characteristics of short flow, economical and efficient treatment and safe and stable operation.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a laver processing waste water treatment facility and method capable of realizing ultra-clean discharge. Background technique [0002] Although laver processing wastewater meets the first-level A discharge standard of "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB19819-2002) after conventional wastewater treatment processes, the wastewater still contains tiny suspended particles, a small amount of nutrients, and some are refractory to degradation. Organic matter with a certain chroma. If the water body is directly discharged, it will cause water pollution, which is not conducive to the sustainable development of the ecological environment. At the same time, the laver processing process produces a huge amount of wastewater. If the processed laver processing wastewater that meets the discharge standards is discharged directly, it will cause a...

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Problems solved by technology

[0002] Although laver processing wastewater meets the first-level A discharge standard of "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB19819-2002) after conventional wastewater treatment processes, the wastewater still contains tiny suspended particles, a small amount of nutrients, and some are refractory to degradation. Organic matter, with a certain color

If the water body is directly discharged, it will cause water pollution, which is not conducive to the sustainable development of the ecological environment.

At the same time, laver produces a huge amount of wastewater during the processing process. If the processed laver processing wastewater that meets the discharge standards is discharged directly, it will cause a huge waste of water, which will not only increase the treatment cost, but also bring pressure to urban tap water resources.

[0003] The pollutants in laver processing wastewater are mainly organic matter such as laver fragments, soluble protein colloids, and sediment. It is characterized by high content of total nitrogen and total phosphorus, and they all exist in the form of organic matter. The total nitrogen mostly exists in the form of purines. The content of suspended solids (SS) is high, the color is deep, the salt content is high, the chemical oxygen demand and biochemical oxygen demand are high, and the general biochemical treatment process cannot meet the recycling standard

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