System and method for deeply treating brown alga chemical engineering waste calcium water through double-membrane technology

Abstract

The invention discloses a system and a method for deeply treating brown alga chemical engineering waste calcium water through a double-membrane technology. The system for deeply treating brown alga chemical engineering waste calcium water through the double-membrane technology is characterized in that a brown alga chemical engineering waste calcium water pipeline 8 is sequentially connected with a coagulation-air flotation treatment tank 1, a ceramic membrane module 2, an activated carbon tank 3 and a reverse osmosis membrane module 4, and the reverse osmosis membrane module 4 is connected with a production water pipe 9; and the ceramic membrane module 2 is connected with a settlement tank 6 through a pipeline, and the settlement tank 6 is connected with an oxidation reactor 7 and the coagulation-air flotation treatment tank 1 through a pipeline. The ceramic membrane module is used to pre-treat the waste calcium water, so the process treatment step is simplified; and the ceramic membrane module occupies a small area and has a high sewage treatment efficiency. The pretreatment using a ceramic ultrafiltration membrane system significantly reduces the pollution of a reverse osmosis membrane, reduces the cost of the pretreatment process and realizes easy technology amplification.

Description

technical field [0001] The invention relates to the field of sewage treatment of seaweed industrial production, in particular to the treatment of waste calcium water produced in the production process of sodium alginate products. Background technique [0002] Seaweed processing products mainly include red algae gelatinous products and brown algae chemical products. my country's annual production capacity of alginate products is about 35,000 tons, accounting for 60% of the world's total production capacity. It is a pillar product in my country's seaweed processing industry and has been widely used in printing and dyeing, medicine, food, daily necessities and other fields. The production of 1 ton of alginate will consume 1,000 tons of fresh water, and the waste calcium water produced will account for more than 70% of all wastewater. The reuse of the above-mentioned sewage after treatment will effectively reduce the production cost of enterprises, save fresh water resources, a...

AI Technical Summary

Problems solved by technology

However, the pretreatment steps of this invention are complicated, the equipment cost and floor space are too large, and the addition of various chemical reagents not only increases the treatment cost but also affects the subsequent treatment process

The Chinese invention patent CN102745841A published in 2012, "A New Recycling Process for Brown Algae Chemical Waste Calcium Water", describes a technology that combines chemical precipitation, electrodialysis and ion exchange to treat waste calcium water; the electrodialysis process in this invention can The consumption is too high, the cost of regeneration is high, and a large amount of regeneration waste liquid is produced, the cost of treating actual sewage is too high, and it has no practical value

However, the above-mentioned technologies still require the use of a large amount of chemicals, and at the same time, after the waste calcium water is treated and reused, a large amount of high-salt wastewater will still be produced, and the later wastewater treatment is more difficult.

[0005] At present, there is no report on the method of using ceramic membrane modules to treat brown algae chemical waste calcium water

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