Current situation of COD exceeding standard problem handling
The COD index reflects the degree of water pollution and can be used as a comprehensive indicator of the relative content of organic matter. The higher the COD, the more severe the pollution of organic matter in the water body. When the COD is very high, it will cause the deterioration of natural water quality, resulting in serious pollution and affecting ecological balance.
The problem of COD exceeding the standard has always been a challenge for electroplating, chemical industry, printing and dyeing, and urban sewage.
At present, the main methods for removing COD from wastewater are biological and physicochemical methods. However, some wastewater with complex properties, such as leachate from garbage, fine chemical, pharmaceutical, pesticide wastewater, etc., have large water quality changes, high heavy metal and ammonia nitrogen content, and poor biodegradability, making it difficult to thoroughly treat them using biological methods.
In addition, with the improvement of wastewater discharge standards, general physical and chemical methods are also difficult to reduce the concentration of COD in wastewater to the standard level, which cannot meet the requirements of upgrading and transformation. The problem of COD exceeding the standard requires an efficient and low-cost treatment method.
Product Introduction
Jiangsu Haipu Functional Materials Co., Ltd. has developed a series of products - COD removal adsorption resin - to address the problems of difficulty in meeting COD standards and inability to meet the requirements of upgrading and transformation in industries such as chemical engineering and printing and dyeing.
*COD adsorption resin products
There are different models of products to choose from according to different application scenarios and processing objects. Haipu's COD removal adsorption resin material has advantages such as large adsorption capacity, renewable use of adsorption materials, and long service life.
Product parameters
When in use, Haipu COD removal adsorption resin products can simultaneously reduce the COD content and chromaticity in wastewater, achieving the requirements of reclaimed water reuse in enterprise wastewater (COD content<50mg/L).
Reduce the cost of wastewater treatment for enterprises, with no secondary pollution, and a complete set of treatment equipment module components in the form of high automation and simple operation.
| Name | Index |
| Appearance | Red brown to brown spherical particles |
| Water content | 55.0~65.0% |
| Particle size range | (0.4~1.25mm)≥95.0% |
| Wet visual density | 0.65~0.75 g/ml |
| Sphericity ratio | ≥95.0% |
| Porosity | 35~50% |
| Skeleton density | 0.8~1.0 g/ml |
| Grinding roundness rate | ≥90%
|
*Product parameters of COD adsorption resin
When using Haipu's adsorption process to treat COD wastewater, the wastewater is pre filtered to remove suspended and particulate matter, and then enters the adsorption tower for adsorption. The special adsorption material filled in the adsorption tower can adsorb the organic matter in the wastewater on the surface of the material, ensuring that the effluent continues to meet the discharge standards.
After adsorption saturation, specific desorption agents are used to desorb the adsorbent material, allowing it to regenerate, and this process is continuously repeated.
Product and its supporting process characteristics
Compared with COD removal treatment technologies on the market, Haipu COD removal adsorption resin products and their supporting processes have the following advantages:
Deep processing: Processing biochemical wastewater with high decolorization efficiency and no color reversal. Good removal efficiency and stable performance for COD and other pollutants.
Simple process: Simple process, easy operation, low labor intensity, small footprint, low investment.
Excellent craftsmanship: mainly due to physical adsorption, mild conditions, small industrial scaling up benefits, pilot or industrial scaling up. Due to the denser adsorbent bed and smaller wall flow effect, the treatment effect is often better than that of small-scale experiments.
Low cost: Low operating cost, stable and reliable treatment effect, able to withstand certain water quality fluctuations and impacts.
Green and environmentally friendly: mild usage conditions, long equipment lifespan, simple maintenance, minimal subsequent investment, no hazardous waste generated in the process, no secondary pollution, making it a green and environmentally friendly solution.
Product application effect
Haipu COD removal adsorption resin products and their supporting combination processes have helped multiple customers meet their relevant treatment needs.
01
Fine chemical enterprises handle COD projects
This project is a fine chemical production wastewater in Shandong, with a COD content of 60000mg/L. After treatment with Haipu adsorption resin products and supporting processes, the COD concentration was reduced to 500mg/L, with a removal rate of 98.3%.
The original direct entry into MVR caused MVR blockage, and the steamed salt is hazardous waste with high processing costs. After this process, the steamed salt is white, making it the first production enterprise in Shandong to classify waste salt as general solid waste after treatment.
| Source | Water volume (m³/d) | COD(mg/L) | Appearance |
| Production wastewater | 350 | ~60000 | Black |
| Effluent | 350 | <500 | Near colorless |
*Adsorption resin product processing data
*Comparison before and after processing
02
Textile enterprise COD removal project
The production process of a textile enterprise can generate~2500 tons of wastewater per day. According to policy regulations, the wastewater reuse rate in the printing and dyeing industry must reach 60%. The existing wastewater treatment process of the enterprise has excessive COD in the biochemical effluent, which does not meet the reuse standard.
According to the production needs of the enterprise, Haipu's special adsorption materials are used in combination with adsorption technology to treat the wastewater, which can meet the requirements of reuse. While solving the problem of wastewater treatment in the enterprise, it reduces the cost of outsourcing wastewater treatment and adding new water, and has significant economic value.
| Raw water COD content | COD content in effluent | Appearance of raw water | Appearance of water outlet |
| 164mg/L | 40.5mg/L | Brown | Water clear |
| 164mg/L | 42.3mg/L | Brown | Water clear |
| 164mg/L | 41.4mg/L | Brown | Water clear |
*Adsorption resin product processing data
*Project site
03
Agricultural chemical enterprise project
300 tons/day of heterocyclic wastewater from a certain agricultural chemical plant in Jiangsu, with a COD content of 45000mg/L, was reduced to 3000mg/L after treatment by Haipu, with a removal rate of 93.3%. At the same time, difficult to biodegrade heterocyclic organic compounds were removed, improving biodegradability and providing guarantees for subsequent biochemical standard treatment.
Previously, incineration treatment was used, and the cost of treating each ton of wastewater exceeded 1000 yuan. After switching to adsorption treatment, it has been reduced to 200 yuan. Currently, Haipu has 6 sets of equipment in stable operation in the company.
| Name | Water volume (m³/d) | COD(mg/L) | Ammonia nitrogen | Appearance |
| Device water inlet | 300m³/d | ≤45000mg/L | ≤300mg/L | Brown red |
| Device effluent | 300m³/d | ≤3000mg/L | ≤50mg/L | Near colorless |
*Adsorption resin product processing data
*Comparison before and after processing
04
Chemical enterprises handle projects
A fine chemical enterprise in Jiangsu produces high salt and high COD wastewater. After treatment with Haipu COD removal adsorption resin products and their supporting processes, the COD was reduced from 19000mg/L to 500mg/L, providing a guarantee for subsequent MVR evaporation desalination of the effluent.
The purity of the recycled product is greater than 98%, which not only solves the problem of high COD wastewater treatment, but also realizes the recovery of valuable resources.
| Source | Anhydride | Benzoic acid | COD | Appearance |
| Raw water | ~450mg/L | ~3000mg/L | ~19000mg/L | Brown red |
| Effluent | Not detected | Not detected | ≤500mg/L | Colourless |
*Adsorption resin product processing data
*Comparison before and after processing
05
COD removal project for high salt wastewater in the food industry
The COD and salt content in the wastewater of a large pickled fruit enterprise are both high, and the salt component is only ordinary edible sodium chloride. This wastewater cannot directly enter the existing biochemical system, and steaming salt directly will produce a large amount of dark hazardous waste. After being treated with our company's special adsorbent, the salt evaporation whiteness of the effluent has significantly increased, reaching the reuse standard. The treatment effect is shown in the figure.
*Above is the direct evaporation of raw water, and below is the treated wastewater and salt evaporation situation. The salt whiteness has reached 65, which can be directly used as feed salt or reused.
06
Organic acid COD removal project for chemical enterprises
A certain agricultural chemical group produces 1000 tons/day of organic acid wastewater. After treatment with Haipu COD adsorption resin products, the COD is reduced from 7000-9000mg/L to below 1500mg/L. The effluent enters the biochemical system, effectively reducing the sludge load of the system.
The effluent pH is 6-7, and there is no need to add alkali neutralization, which greatly saves operating costs. At the same time, after the adsorbent is saturated and regenerated using the desorption agent, the desorption solution can be sold as a by-product, bringing additional benefits.
| Source | Water volume (m³/d) | COD(mg/L) | Go there |
| Production wastewater | 1000 | 8800 | -- |
| Effluent | 1000 | <1500 | Advanced biochemistry |
| Desorption fluid | ~60 | >150000 | By-product |
*Adsorption resin product processing data
On site treatment of resin products and supporting processes
*Project site
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