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Novel brown algae chemical waste calcium water recycling process

A technology of recycling and chemical industry, applied in the fields of chemical industry and environmental protection, can solve the problems of high salinity of recycled water that cannot meet the process requirements, poor pollution resistance of equipment, high cost of water treatment, etc., to achieve economical and efficient reuse and reduce treatment The effect of low burden and water quality requirements

Active Publication Date: 2012-10-24
YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned waste calcium water treatment method has the following defects: Among them, the chemical precipitation method only performs decalcification treatment, but does not perform desalination treatment, so that the salinity in the reused water is too high to meet the process requirements; the reverse osmosis method produces excellent water indicators. , but the equipment has poor pollution resistance and the cost of water treatment is too high for enterprises to afford

Method used

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Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: This embodiment proposes a novel recycling process for brown algae chemical waste calcium water, including the following steps:

[0025] (1) The production workshop takes 100L of waste calcium water, which contains 550ppm calcium and 10.0ms / cm conductivity. Introduce CO into waste calcium water 2 , adjust the feed liquid pH to 6.5;

[0026] (2), adding a decalcifying agent to the waste calcium water for a decalcification treatment, standing for precipitation, using Ca(OH) 2 Or CaO as a decalcifying agent, according to the calcium content in the waste calcium water, according to the molar ratio of the total amount of calcium in the waste calcium water to the total amount of calcium in the decalcifying agent 1:0.6, add Ca(OH) 2 Or CaO, mechanical stirring is used during the addition process, the pH value of the waste calcium water is adjusted to 7.0, and it is left to settle for 2 hours;

[0027] (3) Pretreatment of decalcified wastewater by sand filtrati...

Embodiment 2

[0032] Embodiment two: the decalcifying agent that present embodiment step (1) adopts is Ca(OH) 2 (slaked lime), the mol ratio of total calcium content and decalcifying agent in waste calcium water is 1: 0.5; The concentration volume ratio that step (3) adopts is 2: 1, and fresh water conductivity is controlled at 4.0ms / cm; Step (5) The volume ratio of product water and tap water used is 1:2, and the specific process is as follows:

[0033] Take 100L of waste calcium water after recycling, in which the calcium content is 420ppm, and the conductivity is 9.2ms / cm. Introduce CO into waste calcium water 2 , adjust the pH of the feed liquid to 6.3; use Ca(OH) 2 (slaked lime) as a decalcifying agent, according to the calcium content in the waste calcium water, add Ca(OH) 2 , mechanical stirring was used during the addition process to adjust the pH value of the waste calcium water to 7.0, and it was left to settle for 2 hours; sand filtration was used to pretreat the decalcified w...

Embodiment 3

[0034] Embodiment three: the decalcifying agent adopted in step (1) is CaO (quick lime), and the molar ratio of the total calcium content in waste calcium water to the decalcifying agent is 1: 0.4; the concentration volume ratio adopted in step (3) is 1: 2 , the conductivity of fresh water is controlled at 2.0ms / cm; the volume ratio of produced water and tap water used in step (5) is 2: 1, and the specific process is as follows:

[0035] The production workshop takes 5m of waste calcium water 3 , of which the calcium content is 420ppm and the conductivity is 7.5ms / cm. Introduce a large amount of CO into waste calcium water 2The boiler tail gas is adjusted to a pH of 6.0; CaO (quick lime) is used as a decalcifying agent, and according to the calcium content in the waste calcium water, the molar ratio of the calcium total amount in the waste calcium water to the total amount of calcium in the decalcifying agent is 1:0.4. CaO was added to the waste calcium water, mechanical sti...

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Abstract

The invention provides a novel brown algae chemical waste calcium water recycling process. The process comprises the steps that: a decalcification agent is added into waste calcium water, such that a decalcification treatment is carried out; a sand filtration pre-treatment is carried out; salt removing and calcium removing are carried out by electrodialysis; residual calcium ions in low-concentration water obtained after electrodialysis are further removed by using cation exchange resin; water obtained from the treatments is mixed with tap water according to a certain ratio, and the mixed water is reutilized as a process water for diluting a digestion solution; and the diluted solution is filtered and calcified, and the produced waste calcium water enters a new circulation. According to the invention, a chemical precipitation, electrodialysis and ion exchange combined process is adopted, such that defects such as poor water quality and high cost of traditional waste calcium water treatment processes are overcome. A recycling water quality index is ensured, and waste calcium water treatment cost is reduced, such that economic and high-efficiency recycling is realized.

Description

technical field [0001] The invention belongs to the technical fields of environmental protection and chemical industry, and in particular relates to a combined recycling process of novel brown algae chemical waste calcium water. Background technique [0002] my country is a big country in seaweed breeding and processing, and brown algae chemical industry is one of the pillar industries. Among them, the annual output of sodium alginate reaches 30,000 tons, ranking first in the world. The brown algae chemical industry consumes a lot of water, producing about 450-550m3 of sodium alginate per ton 3 Process wastewater, because it contains a large amount of calcium salts and sodium salts, cannot be reused. It is generally discharged directly after environmental protection treatment reaches the standard. The national annual discharge can reach 18000000-22000000m 3 . In recent years, due to the shortage of water resources and the improvement of environmental protection requirement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F1/461C02F1/58
Inventor 苗钧魁冷凯良殷邦忠李晓川许洋贾福强孙伟红邢丽红
Owner YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI
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