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A kind of treatment and reuse method of calcium chloride wastewater

A technology for calcium chloride and wastewater, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as easy crystallization, easy scaling, and large discharge, and achieve The effect of reducing equipment investment and process requirements, reducing evaporation costs, and reducing treatment costs

Inactive Publication Date: 2011-12-28
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] 6) Easy to crystallize and scale. In addition to calcium chloride, there are also components with partial solubility such as calcium sulfate and silicate in wastewater. Basically, there are problems of easy scaling in various treatment methods
[0013] If electrodialysis is used to desalinate, better results will be achieved, but wastewater pretreatment must at least solve problems such as high suspended solids, easy crystallization, and COD membrane pollution
[0014] Propylene oxide industrial wastewater has complex components and a large discharge volume, which has brought great pollution to the environment. Due to its problems such as high temperature, high salt, high COD, and easy local crystallization, it has caused great harm to the treatment of wastewater. difficulty

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] With a treatment capacity of 10 tons per hour, the design, installation and commissioning of each treatment device of the entire process were carried out, and finally a field test was carried out, and a pilot test was carried out on the calcium chloride wastewater of a propylene oxide plant:

[0036] 1. The pH of the calcium chloride wastewater in its factory is 11.8, the salt content is 3.5%wt, COD Cr 1400mg / L, suspended matter 1000mg / L, water temperature 82°C;

[0037] 2. Calcium chloride wastewater is sent to the thickening tank through the sludge pump, and the lime milk is recovered. The supernatant enters the optimized pretreatment device, and the supernatant is sent to the optimized pretreatment device by centrifugal pump. The optimized pretreatment consists of flocculation, sedimentation, It is composed of barium chloride precipitated sulfate, neutralized by adding acid. The settling time is 1.5 hours, the flocculant is polyferric chloride, and the dosage is 60 ...

Embodiment 2

[0043] Design, install and debug each treatment device of the whole process with a treatment capacity of 5 tons per hour, and finally conduct a field test, and conduct a pilot test on the calcium chloride wastewater of an epichlorohydrin plant:

[0044] 1. The pH of the calcium chloride wastewater in its factory is 12, the salt content is 3.2%wt, COD Cr 1200mg / L, suspended matter 1200mg / L, water temperature 84°C;

[0045] 2. Calcium chloride wastewater is sent to the thickening tank through the sludge pump, and the lime milk is recovered. The supernatant enters the optimized pretreatment device, and the supernatant is sent to the optimized pretreatment device by centrifugal pump. The optimized pretreatment consists of flocculation, sedimentation, It is composed of barium chloride precipitated sulfate, neutralized by adding acid. The settling time is 1.8 hours, the flocculant is polyaluminum chloride, and the dosage is 80 g / ton of wastewater, and the coagulation aid is anionic...

Embodiment 3

[0051] Design, install and debug each treatment device of the whole process with a treatment capacity of 2 tons per hour, and finally conduct a field test, and conduct a pilot test on the calcium chloride wastewater of a propylene oxide plant:

[0052] 1. The pH of calcium chloride wastewater in a factory is 11.2, the salt content is 3.0%wt, COD Cr 1000mg / L, suspended matter 900mg / L, water temperature 81℃;

[0053] 2. Calcium chloride wastewater is sent to the thickening tank through the sludge pump, and the lime milk is recovered. The supernatant enters the optimized pretreatment device, and the supernatant is sent to the optimized pretreatment device by centrifugal pump. The optimized pretreatment consists of flocculation, sedimentation, It is composed of barium chloride precipitated sulfate, neutralized by adding acid. The settling time is 1.3 hours, the flocculant is polyferric chloride, and the dosage is 50 g / ton of wastewater, and the coagulant aid is anionic polyacryla...

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Abstract

The invention belongs to the technical field of sewage treatment, and in particular relates to a water treatment and reuse method of calcium chloride wastewater. The present invention basically achieves zero discharge of waste water and recyclable salt and water through the use of process design such as optimized pretreatment, biochemical treatment, reverse osmosis water recycling, electrodialysis concentration, and evaporation recovery. The invention has the advantages of small occupied area, low operation cost and good economic and social benefits. The invention can be widely used in enterprises producing calcium chloride wastewater.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a water treatment and reuse method of calcium chloride wastewater. technical background [0002] The main source of calcium chloride wastewater is represented by the wastewater produced by the saponification reaction of propylene oxide and epichlorohydrin. The main reason is that calcium hydroxide needs to be put into the process to neutralize the hydrochloric acid produced in the process and finally produce calcium chloride wastewater. Through technical novelty research, the current domestic methods of treating this type of wastewater mainly include direct discharge to urban sewage treatment plants for unified treatment, biological methods and physical, physical and chemical combination processes, etc. Another ZL200910096097.X introduced a saponification wastewater treatment and recovery method by chlorohydrinization method. [0003] Taking the wastewater ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C01F11/24C02F1/469
Inventor 金可勇
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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