Unlock instant, AI-driven research and patent intelligence for your innovation.

Treatment method for ammonia nitrogen and COD (Chemical Oxygen Demand) in surface treatment waste water

A treatment method and surface treatment technology, which is applied in the field of surface treatment wastewater with low concentration of ammonia nitrogen and COD, can solve the problems that hinder the popularization and application of biochemical methods, complex operation, frequent replacement of activated carbon, etc.

Inactive Publication Date: 2012-07-04
SHANGHAI LIGHT IND RES INST
View PDF4 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advanced oxidation method needs to be equipped with an advanced oxidation device with a large investment, and the utilization rate of advanced oxides such as ozone is not high, and the economy is poor
Although the activated carbon adsorption method can reduce the COD content to a certain extent, it requires frequent replacement of activated carbon, which is costly and complicated t

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Treatment method for ammonia nitrogen and COD (Chemical Oxygen Demand) in surface treatment waste water
  • Treatment method for ammonia nitrogen and COD (Chemical Oxygen Demand) in surface treatment waste water
  • Treatment method for ammonia nitrogen and COD (Chemical Oxygen Demand) in surface treatment waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Select the electroplating wastewater from an electroplating factory after chemical precipitation treatment, and firstly use the method of iron-carbon to treat the wastewater. Iron shavings are used as raw materials for iron-carbon reaction. The mixture was reacted for 1 hour, and then the pH was adjusted to 10 for coagulation and precipitation. The raw water quality and the results after iron-carbon treatment are shown in Table 2.

[0057] Table 2. Water quality indicators of an electroplating wastewater

[0058]

[0059]

[0060] In Table 2, BOD is biochemical oxygen demand, and B / C is the ratio of BOD and COD. It can be seen from the data in the above table that the iron-carbon micro-electrolysis reaction can reduce the concentration of metal ions and increase the B / C ratio.

Embodiment 2

[0062] The chemically treated wastewater from an electroplating enterprise basically does not contain metal ions, and directly enters the hydrolytic acidification tank. The residence time in the hydrolysis acidification tank is 5-6 hours, and the residence time in the MBR reactor is 4 hours. The treated wastewater can be discharged directly. , the treatment effect is shown in Table 3, COD and ammonia nitrogen can be removed well at the same time.

[0063] Table 3. Wastewater treatment effect of an electroplating enterprise

[0064]

[0065] It can be seen from the data in the above table that the residence time of wastewater in the hydrolysis tank is 5-6h, and the residence time in the MBR reactor is 4h, and the COD of the effluent can be reduced to 20mg·L -1 , Ammonia nitrogen can be removed simultaneously with COD at a ratio of 1:15.

Embodiment 3

[0067] The B / C of most electroplating wastewater is lower than 0.3, and the total nitrogen content of some electroplating wastewater is high. The way of adding domestic sewage from enterprises can be used as an auxiliary carbon source to appropriately increase the B / C ratio and COD load. The biodegradability of domestic sewage is high, which can improve the biodegradability of mixed sewage, increase the sludge load, improve sludge activity, and obtain better treatment effects. At the same time, it provides sufficient carbon sources for the decomposition of ammonia nitrogen and improves ammonia nitrogen treatment. Efficiency, and finally achieve the standard discharge of COD and ammonia nitrogen in the electroplating wastewater.

[0068] The wastewater after chemical precipitation treatment of an electroplating enterprise is treated with iron carbon + hydrolytic acidification + MBR, so that various indicators of raw water can meet the discharge standards, as shown in Table 4. T...

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

No PUM Login to View More

Abstract

The invention relates to a treatment method for ammonia nitrogen and COD (Chemical Oxygen Demand) in surface treatment waste water. The treatment method comprises the following steps of: introducing waste water into an iron-carbon micro-electrolysis reaction basin, and undergoing an iron-carbon micro-electrolysis reaction in an environment where the pH value is 2-4; adjusting the pH value of waste water in the iron-carbon micro-electrolysis reaction basin to be more than or equal to 9 to precipitate metal ions in the waste water; removing the precipitates from the waste water; performing hydrolytic acidification on the waste water; and removing ammonia nitrogen and COD from the waste water with a membrane biological method. Through iron-carbon micro-electrolysis treatment, metal ions with negative influences on a biochemical process can be removed, the biodegradability of waste water is enhanced, and the biodegradability of the waste water is further enhanced through hydrolytic acidification.

Description

technical field [0001] The invention relates to a method for treating ammonia nitrogen and COD of surface treatment wastewater, and is especially suitable for treating low-concentration ammonia nitrogen and COD of surface treatment wastewater. Background technique [0002] In industries such as electronics, electroplating, surface treatment and printed circuit boards, the main source of organic matter in wastewater is the pre-treatment wastewater of plated parts. Wastewater contains organic substances such as surfactants, pre-membrane agents, and corrosion inhibitors, and chemicals such as ammonia and ammonium chloride are often used in the process. The use of these organic substances and ammonia drugs will inevitably cause ammonia nitrogen and COD (chemical oxygen demand) in the discharged wastewater to exceed the standard. At present, the "Surface Treatment Pollutant Discharge Standard" (GB21900-2008) has made stricter restrictions on the discharge of ammonia nitrogen and...

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
no application Login to View More
IPC IPC(8): C02F9/14C02F1/461
Inventor 付丹李冰璟
Owner SHANGHAI LIGHT IND RES INST