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A concentrated water recovery treatment method and system

A technology for recovery and treatment of concentrated water, applied in water/sewage treatment, multi-stage water/sewage treatment, heating water/sewage treatment, etc., can solve the problems of unstable operation of the treatment system and low recovery rate of concentrated water

Active Publication Date: 2022-02-25
河北广利环保工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of unstable operation of the current treatment system and low recovery rate of concentrated water, the present invention provides a method for recovery and treatment of concentrated water

Method used

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  • A concentrated water recovery treatment method and system
  • A concentrated water recovery treatment method and system

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Embodiment 1

[0034] This embodiment provides a concentrated water recycling treatment method, which specifically includes the following steps:

[0035] Step a, adding sodium carbonate to the concentrated water to be treated under stirring, reacting at 50° C. for 60 min, the mol ratio of the sodium ion in the sodium carbonate to the sum of calcium and magnesium ions in the concentrated water to be treated is 2.1: 1; Add calcium hydroxide and react at 60°C for 60 minutes, the molar ratio of calcium ions in the calcium hydroxide to magnesium ions in the concentrated water to be treated is 0.03:1;

[0036] Step b, centrifuging and concentrating the feed liquid obtained in step b to obtain supernatant I and slurry I, and filtering the supernatant I with DTRO to obtain fresh water I and concentrated water I;

[0037] Step c. Add polyacrylamide to the concentrated water I for coagulation. After coagulation is completed, add methylcellulose and chitosan under stirring, keep the feed solution at pH...

Embodiment 2

[0041] This embodiment provides a concentrated water recycling treatment method, which specifically includes the following steps:

[0042] Step a, add sodium carbonate to the concentrated water to be treated under stirring, react at 70°C for 20min, the mol ratio of the sodium ion in the sodium carbonate to the sum of calcium and magnesium ions in the concentrated water to be treated is 2.3:1; Add calcium hydroxide and react at 80°C for 20 minutes, the molar ratio of calcium ions in the calcium hydroxide to magnesium ions in the concentrated water to be treated is 0.04:1;

[0043] Step b, centrifuging and concentrating the feed liquid obtained in step b to obtain supernatant I and slurry I, and filtering the supernatant I with DTRO to obtain fresh water I and concentrated water I;

[0044] Step c. Add polyacrylamide to the concentrated water I for coagulation. After coagulation is completed, add methylcellulose and chitosan under stirring, keep the feed solution at pH 11 and 55...

Embodiment 3

[0048] This embodiment provides a concentrated water recycling treatment method, which specifically includes the following steps:

[0049] Step a, adding sodium carbonate to the concentrated water to be treated under stirring, reacting at 60°C for 40min, the mol ratio of the sodium ion in the sodium carbonate to the sum of calcium and magnesium ions in the concentrated water to be treated is 2.2:1; Add calcium hydroxide and react at 70°C for 40 minutes, the molar ratio of calcium ions in the calcium hydroxide to magnesium ions in the concentrated water to be treated is 0.035:1;

[0050] Step b, centrifuging and concentrating the feed liquid obtained in step b to obtain supernatant I and slurry I, and filtering the supernatant I with DTRO to obtain fresh water I and concentrated water I;

[0051] Step c. Add polyacrylamide to the concentrated water I for coagulation. After coagulation is completed, add methylcellulose and chitosan under stirring, and keep the feed solution at p...

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Abstract

The invention belongs to the technical field of concentrated water treatment, and in particular relates to a concentrated water recovery and treatment method and system. The treatment method includes adding sodium carbonate and calcium hydroxide to the concentrated water to be treated, carrying out a desalination reaction at a specific temperature, then centrifuging and concentrating the feed liquid, and filtering the obtained supernatant with a disc tube reverse osmosis membrane (DTRO), The obtained concentrated water is subjected to coagulation, flocculation, centrifugation and concentration again, and ultrafiltration. The resulting slurry was concentrated by centrifugation and evaporated. The treatment system includes a desalination reaction device, a first concentration centrifuge device, a DTRO filter device, a coagulation device, a flocculation device, a second concentration centrifuge device and an ultrafiltration device. The concentrated water recovery and treatment method and system of the invention can effectively treat the concentrated water, the obtained fresh water can be directly used for industrial production or municipal water, the recovery rate is high, and the waste of the concentrated water is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of concentrated water treatment, and in particular relates to a concentrated water recovery and treatment method and system. Background technique [0002] The reverse osmosis process is a relatively mature water treatment process in the prior art. It is highly efficient and clean, and is widely used in water treatment in industries such as electric power, metallurgy, electronics, and chemical industry. However, the reverse osmosis process has a low utilization rate of raw water. Generally, the recovery rate of fresh water is ≤75%, and the concentrated water generated in the water production process accounts for more than 25% of the volume of raw water. Calcium magnesium ions and silicon scaling substances in concentrated water tend to become serious, and the organic index COD (Chemical Oxygen Demand, chemical oxygen demand) exceeds the discharge standard. With the tightening of environmental protection polic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10
CPCC02F9/00C02F1/04C02F1/38C02F1/441C02F1/56C02F1/444C02F1/5236C02F1/5245Y02A20/131
Inventor 强利民任伟帅程景
Owner 河北广利环保工程有限公司