Comprehensive treatment method for recycling waste calcium water and waste acid obtained through algin production

A comprehensive treatment, alginate technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Insufficient treatment of calcium water and waste acid water, etc., to achieve the effects of short treatment time, overcoming sedimentation difficulties, and low treatment costs

Active Publication Date: 2016-04-13
SHANDONG JIEJING GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for the production of alginate in view of the incomplete treatment of waste calcium water and waste acid water produced in the current production of alginate, increasing the pressure of subsequent environmental protection treatment, and the problem that it cannot be effectively utilized after treatment. A comprehensive treatment method for recycling waste calcium water and waste acid water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A comprehensive treatment method for recycling waste calcium water and waste acid water in the production of alginate, comprising the following steps: (1) using a centrifuge to remove suspended matter containing low-molecular calcium alginate from 10L of waste calcium water taken from the alginate workshop , to obtain a clarified liquid; wherein the German degree of waste calcium water is 55, and the salt content is 0.32%; (2) Add 10.41 g of sodium carbonate 1 times the molar amount of calcium ions to the waste calcium water after step (1) treatment Carry out decalcification. Then settle, and settle for 1 hour to obtain the supernatant and precipitated calcium carbonate; (3) filter the obtained supernatant through a 300-mesh screen or centrifuge for impurity removal treatment; after the impurity removal treatment, directly It is used as reuse water in the digestion and dilution process in the production of alginate. The salt content of the reuse water is 0.33%, and the ...

Embodiment 2

[0023] A comprehensive treatment method for the recycling of waste calcium water and waste acid water in the production of alginate, comprising the following steps: (1) adopting the dissolved air method to flotation the 500L waste calcium water taken from the alginate workshop and containing low-molecular calcium alginate Suspended solids are removed to obtain clarified liquid; wherein the German degree of the waste calcium water is 68, and the salt content is 0.45%; (2) Add 1.1 times the molar amount of calcium ion to the waste calcium water treated in step (1) of carbonic acid Sodium 708g is decalcified. Then settling, using static settling for 0.5 hours, to obtain the supernatant and precipitated calcium carbonate; (3) first centrifuge the obtained supernatant through a disc centrifuge for impurity removal, wherein the speed is 4000 rpm; After impurity removal treatment, it is directly used as reuse water in the digestion and dilution process in the production of alginate. ...

Embodiment 3

[0025] A comprehensive treatment method for the recycling of waste calcium water and waste acid water in the production of alginate, comprising the following steps: (1) adopting the dissolved air method to flotation the 500L waste calcium water taken from the alginate workshop and containing low-molecular calcium alginate Suspended solids are removed to obtain clarified liquid; wherein the German degree of the waste calcium water is 85, and the salt content is 0.82%; (2) Add 1.2 times the molar amount of calcium ion to the waste calcium water treated in step (1) of carbonic acid Sodium 965g is decalcified. Then settling, using static settling for 0.5 hours, to obtain the supernatant and precipitated calcium carbonate; (3) first centrifuge the obtained supernatant through a disc centrifuge for impurity removal, wherein the speed is 4000 rpm; After impurity removal treatment, it is directly used as reuse water in the digestion and dilution process in the production of alginate. ...

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Abstract

The invention belongs to the technical field of alga chemical production and relates to a comprehensive treatment method for recycling waste calcium water and waste acid obtained through algin production. The comprehensive treatment method comprises 1, removing suspended solids in waste calcium water, 2, adding a calcium removal agent into the waste calcium water to remove calcium and carrying out settlement, 3, removing impurities in the supernatant, directly utilizing the supernatant as return water, adding calcium carbonate into the waste acid for a reaction so that a calcium chloride solution is obtained and adding hydrochloric acid into the calcium chloride solution so that a calcium chloride mass concentration is at least 12%, and 4, filtering the calcium chloride solution and directly utilizing the filtered calcium chloride solution in an algin solution calcification process in algin production. The comprehensive treatment method solves the problem that the existing waste water treatment process has high settlement difficulty and a high cost and produces a large amount of calcium salt wastes. The comprehensive treatment method realizes comprehensive recycle of algin processing waste water.

Description

technical field [0001] The invention belongs to the technical field of seaweed chemical production, and in particular relates to a comprehensive treatment method for recycling waste calcium water and waste acid water in alginate production. Background technique [0002] In the seaweed chemical industry, alginate (also known as sodium alginate, sodium alginate) produced from brown algae has a production process of more than 40 years and has been widely used in food, textile, printing and dyeing, chemical industry, medicine, agriculture, etc. In many fields, the demand is increasing. At present, most of the production of alginate in our country is by calcification and acidification, and the water consumption per ton of product is 600-800 tons. In addition to producing more than 100 tons of high-concentration wastewater soaked in seaweed, more than 20 tons of water with a pH value of about 1.5 Except for waste acid water, the rest is waste calcium water with a hardness of 50-9...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C08B37/04
Inventor 惠锋基林成彬王斌滕怀华韦晓廷
Owner SHANDONG JIEJING GROUP CORP
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