Treatment method of chromium-free coating wastewater of iron and steel enterprises
A treatment method and a chrome coating technology are applied in the field of pretreatment technology of chrome-free coating wastewater, which can solve the problems of complex treatment process, large consumption of chemicals, large amount of sludge generated, etc., and achieve simple production process and production cost. Low, sludge reduction effect
Pending Publication Date: 2021-08-03
SINOSTEEL MAANSHAN INST OF MINING RES +2
View PDF4 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The present invention aims at the technical problems such as large consumption of chemicals, large amount of sludge generated, complex treatment process and high treatment cost existing in the treatment of chromium-free coating wastewater in iron and steel enterprises, and provides a method that can s
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0027] In order to better describe the present invention, a method for treating chromium-free coating wastewater of iron and steel enterprises of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0028] Depend on figure 2 The system structure connection diagram of the processing method of a kind of chrome-free coating waste water of iron and steel enterprise of the present invention shown and combine figure 1 Find out, a kind of processing method of the chrome-free coating waste water of iron and steel enterprise of the present invention, the chromium-free coating waste water of iron and steel enterprise enters in the aeration regulating tank 1 earlier, is carried in the four-stage mixing reactor 2 by the pump again, in the four-stage Add sodium hydroxide, demulsifier, PAC, PAM medicament into mixing reactor 2. The effluent from the four-stage mixing reactor 2 enters the high-efficiency air flotation device 3 , a...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for treating chromium-free coating wastewater of iron and steel enterprises, which comprises the following steps that: firstly, chromium-free coating wastewater is fed into an aeration regulating tank and then pumped into a four-stage mixing reactor, and sodium hydroxide, a demulsifier, a PAC (Polyaluminum Chloride) agent and a PAM (Polyacrylamide) agent are added into the four-stage mixing reactor; the effluent of the fourth-stage mixing reactor enters an efficient air flotation device and then enters a third-stage mixing reactor, sulfuric acid, PAC and PAM agents are added into the third-stage mixing reactor 4, and the effluent of the third-stage mixing reactor 4 enters a chromium inclined plate sedimentation tank; after the effluent passes through the inclined plate sedimentation tank, supernate meets the requirement of entering a biochemical upgrading system, and bottom mud is transported outwards. According to the method, the consumption of a neutralizing agent and a flocculating agent can be greatly reduced, the amount of finally generated sludge is greatly reduced, and the content of heavy metal elements in the sludge is remarkably increased, so that centralized treatment of the sludge is facilitated, the production process is simple, and the production cost is low.
Description
technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a pretreatment process for chromium-free coating wastewater, so that the treated chromium-free coating wastewater meets the requirements of the "Water Pollutant Discharge Standard for Iron and Steel Industry" (GB13456-2012), It is especially suitable for application in the field of pretreatment of chromium-free coating wastewater generated in the steel industry. Background technique [0002] Chromium-free coating wastewater is wastewater generated during the production process of the metallurgical industry. It contains high concentrations of oil and grease, iron, phosphorus, COD and other pollutants. It is a major problem in the field of wastewater treatment in the iron and steel industry at home and abroad. Advanced treatment technology is often required . [0003] There are many types of chromium-free coating wastewater treatment technologies, each with ad...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): C02F9/04C02F101/10C02F101/20C02F103/16
CPCC02F9/00C02F1/20C02F1/40C02F1/66C02F1/56C02F1/5236C02F2001/007C02F2101/203C02F2101/10C02F2101/105C02F2103/16
Inventor 谢宝俊张长生王湘桂谢瑞桃李堂君杨熠卿
Owner SINOSTEEL MAANSHAN INST OF MINING RES