Process for treating and recycling alkaline wastewater containing zinc and chromium ions

A technology for wastewater treatment and chromium ions, applied in the removal of chromium ions and solid particles, and in the field of zinc in wastewater, can solve the problems of destroying ecological balance, endangering residents' production and life, and not much research on treatment technology

Inactive Publication Date: 2014-05-07
HANGZHOU SHUANGBO ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This type of wastewater contains pollution factors such as chromium, zinc, SS, COD, alkalinity, etc., especially a large amount of heavy metal ions will have a long-term negative impact on the surrounding water bodies of the production enterprise, destroy the ecological balance, and endanger the production and life of local residents
Domestic research on the hazards of this type of wastewater and its treatment technology is not much

Method used

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  • Process for treating and recycling alkaline wastewater containing zinc and chromium ions

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Effect test

Embodiment 1

[0022] A color steel production enterprise produces 50,000 tons of color steel per year, discharges 15t / d of alkaline wastewater containing zinc and chromium ions, the pH value of the wastewater is 11-13.5, the concentration of zinc ions is 50-80mg / L, Cr 6+ The concentration is 5~12mg / L, Cr 3+ The concentration is 10-20mg / L. The waste water is introduced into a sequencing batch reaction integrated pool, and after the process of dosing, stirring, reaction, flocculation and precipitation is completed, the supernatant is then treated by an activated carbon filter tank. According to the monitoring by a third-party professional organization, the pH value of the outlet water of the activated carbon filter tank is 7-8, the zinc ion concentration is 0.23mg / L, and the total chromium concentration is 0.16mg / L. The remaining indicators meet the requirements of the "Urban Sewage Recycling Industrial Water Quality" (GB / T19923-2005) standard, meet the needs of enterprise workshops for wash...

Embodiment 2

[0024]A color steel production enterprise has an annual output of 20,000 tons of color steel, and the workshop produces 8t / d of alkaline wastewater containing zinc and chromium ions. According to the monitoring of the workshop wastewater by the local environmental protection department, the pH value of the wastewater is 10-12.5, and the concentration of zinc ions is 60~100mg / L, Cr 6+ Concentration is 8~15mg / L, Cr 3+ The concentration is 5~15mg / L. The waste water is introduced into a sequencing batch reaction integrated pool, and after the process of dosing, stirring, reaction, flocculation and precipitation is completed, the supernatant is then treated by an activated carbon filter tank. According to the monitoring of the local environmental protection department, the pH value of the treated water is 7-8, the zinc ion concentration is 0.17mg / L, and the total chromium concentration is 0.27mg / L. The indicators of the effluent water quality meet the requirements of the "Urban S...

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Abstract

The invention discloses a process for treating and recycling alkaline wastewater containing zinc and chromium ions. The process comprises the steps: introducing wastewater to an integrated sequencing batch reaction tank; then, finishing dosing, stirring, reacting, flocculating and settling processes; treating a supernatant liquid in the reaction tank by using activated carbon, and then, recycling the supernatant liquid as cleaning water; and concentrating the sludge slurry at the lower part of the reaction tank, and then, preparing the sludge slurry into mud cakes to be outwards transported and treated. The alkaline wastewater containing the zinc and chromium ions can be recycled as water after being treated by using the process provided by the invention. The process has the advantages of high efficiency, simplicity, convenience, economy, practicability and the like and can be used for simultaneously realizing economic, societal and environmental benefits.

Description

technical field [0001] The invention relates to a treatment and reuse process of alkaline wastewater containing heavy metal ions, in particular to a method for removing zinc, chromium ions and solid particles in wastewater, and belongs to the fields of sewage treatment and reclaimed water reuse. Background technique [0002] Color steel plate is widely used in construction, household appliances and transportation industries, especially in industrial and commercial buildings such as civil buildings, steel structure workshops, airports, warehouses and refrigeration, and road enclosure construction. Based on a wide range of uses, the market demand for color steel plates continues to expand. Since 2000, the production of color steel plates has entered a period of rapid growth. At present, the annual output of color steel plates in my country exceeds 9 million tons per year, and it is expected that the output will increase in the next 10 years. [0003] The rapid development of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 赵伟荣冯文杰
Owner HANGZHOU SHUANGBO ENVIRONMENTAL PROTECTION TECH
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