Germany is good. As early as 1948, Ruihao Company was established in Rehau, Bavaria, Germany, and began research and production mainly based on polymers. Its products cover many fields such as environmental protection, municipal, construction, industry, medical, furniture, aviation, etc. In the field of environmental protection, German Ruihao Company is one of the foreign brands entering the Chinese market. Since 2003, Ruihao aeration products have been proven to have excellent application effects in municipal, petrochemical, printing and dyeing, food, coking and other fields. Ruihao Micro porous Aerator is becoming an increasingly popular brand among users due to its durability, safety, and energy-saving performance.

Product Introduction
The RAUBIOXON PLUS aeration disc is specially developed by Ruihao to provide microbubbles for sewage biological treatment processes. -Silicone rubber film has stable physical and chemical properties

German Ruihao Silicone Aeration Plate for Leather Wastewater

-Long economic service life

-Uniform and flexible arrangement of aeration discs

-Small pressure loss, significant energy saving

-Can be used for sewage treatment plants that operate continuously or intermittently

-Suitable for municipal or industrial wastewater

Product advantages
The RAUBIOXON PLUS aeration disc adopts a specially developed silicone rubber membrane by Ruihao, which has the following advantages:

-Corrosion resistance and aging resistance, stable operation

-No plasticizers, can maintain the elasticity of the film for a long time

-Anti grease

In addition, the saddle seat connection method developed by Ruihao can save installation time by 80%.

Scope of application
The product can be used in the following wastewater:

-Municipal sewage

-Petrochemical wastewater

-Steel coking wastewater

-Leather wastewater

-Papermaking wastewater

-Textile printing and dyeing wastewater

-Food wastewater

-Beverage wastewater

-Pharmaceutical wastewater

-Printing wastewater

-Garbage leachate

-Chemical wastewater

Note: The applicability of the product is determined through testing under the same water quality conditions.

For special usage environments, please consult with Ruihao engineers

Scope of supply

Product Manual

—RAUBIOXON PLUS DISC 260

one. Product Introduction

1. Introduction

The RAUBIOXON PLUS DISC 260 aeration system consists of silicone rubber membranes, support disks, snap rings, saddle connections, and other components. When oxygenation and aeration are carried out, compressed air diffuses into the water through the microporous gas layer to achieve the purpose of oxygenation and aeration.

German Ruihao Silicone Aeration Plate for Leather Wastewater

2. Performance

The RAUBIOXON PLUS DISC silicone rubber membrane microporous disc aerator is made of corrosion-resistant and anti-aging materials:

-Aeration membrane: Silicone membrane

-Support disk:PPpolypropylene

2.1 Characteristics of Silicone Membrane:

a. Advantages of silicone film

-High elasticity

-Not easily brittle

-Low affinity with sediment

-Oil resistance

-Not easily hardened

-Non biodegradable

-High resistance to chemical corrosion

-Save energy consumption

-Recyclable

b. Performance parameters of silicone rubber film

c. Performance parameters of the support disk

2.2 Advantages of Silicone Rubber Aeration Disk

-Silicone membrane is corrosion resistant and aging resistant, with long service life and stable operation

-The flexible point system design ensures that the micropores on the membrane automatically close when the gas supply is stopped, preventing wastewater from entering the tray

-Perforation will not block, suitable for both continuous operation and intermittent operation

-Good aeration characteristics, high oxygen utilization rate and power efficiency

-The volume of bubbles, uniform distribution of bubbles

-Quick and easy installation method, saving a lot of accessories

-After passing through the aeration disc, the average diameter of the bubbles1.0~2.0mm.

-Under normal usage conditions, maintain a high oxygen transfer rate during the service life.

-Use a condensate drainage device to remove the accumulated water in the air distribution pipe.

two.Aeration disk parameter table

three. Design and Structure

a. The aeration disc provided by our company can adapt to work under different sewage quality and temperature conditions, meet the needs of sewage biochemical treatment in the aerobic zone of the biochemical tank, effectively diffuse the air from the blower evenly into the water, and maintain stable oxygenation effect and efficiency for a long time. When the gas supply is stopped, the aeration hole can be effectively closed.

German Ruihao Aeration Plate

b. The microporous mode aeration disc meets the following requirements:

-Single disk outer diameter 270mm.

-The service life of the microporous mode aeration disc: not less than5Year (municipal wastewater).

c. The microporous aeration disc is disc-shaped and attached with a silicone rubber membranePPOn the support plate made of high-strength materialPPMaterial fixing ring fixation.

d. The rubber film is made of German imported silicone rubber material. The membrane is made using injection molding technology; The membrane punching is mechanical punching, with square holes perpendicular to the membrane pattern.

e. The air entering the aeration disc must be purified to meet the requirements of long-term continuous use or disuse before being put back into use, without causing blockage of micropores and backflow of mixed liquid.

f. The connection between the aeration disc and the air distribution pipe adopts a saddle interface, which does not require additional bolt fastening, avoiding the possibility of detachment during operation caused by different tightening forces of double bolts and saving installation time.

g. The surfaces of each component on the microporous aeration disc are clean and smooth, without scratches, bubbles, pores, inclusions, spots, wrinkles, or sharp edges.

h. The aeration disc provided by our company is resistant to corrosion from urban sewage, high temperature, and acid and alkali.

four. Installation and debugging

The company will provide professional personnel to guide installation and debugging to ensure the quality of installation.

Before installation, it is necessary to check the dimensions of the civil structures.

Test the equipment after installation to ensure quality.

Ruihao Environmental Technology.Ruihao Environmental Technology (Taicang) Co., Ltd. is a wholly-owned subsidiary of German Ruihao Company established in China. It is a professional comprehensive supplier of aeration system solutions that integrates aerator design, production, warehousing, logistics, installation, commissioning, training, and after-sales service. For many years, Ruihao Environmental Technology has been committed to providing customized aerobic biological treatment aeration technology solutions for municipal sewage treatment and industrial wastewater treatment. We always focus on close cooperation with our customers and provide comprehensive solutions for the construction of new water plants, upgrading and maintenance of existing water plants. We have successfully achieved our goals in 500 sewage treatment plants in China.

Taicang Factory.In order to provide timely and effective services to China, Southeast Asia, and various countries in Australia, German Ruihao Company invested 200 million yuan in 2008 to establish a factory in Taicang, Jiangsu, China, fundamentally solving the problem of long supply times. At the same time, as the factory in China is a wholly-owned subsidiary of Germany's Ruihao, its raw material supply and production equipment are all from Germany, and the production process, inspection standards, personnel management, and even logistics and distribution all strictly comply with Germany's Ruihao's requirements. It not only maintains the quality of finished products, but also meets the needs of project progress in terms of supply time. Today's Ruihao has not only become a leader in product quality, but also driven the development of the aeration industry in various aspects such as design, research and development, and service.

3、 Leather industry wastewater

1. Characteristics

Leather wastewater is the wastewater discharged during the leather production process. Usually, animal skins are salted or soaked in water to make them swell, lime is added, meat is removed, and alkali is removed. Then, tannins or chromium are used for tanning and softening, and finally dyed and processed into leather. Leather wastewater mainly comes from the preparation, tanning, and dyeing sections, which contain a large amount of toxic and harmful substances such as protein, fat, inorganic salts, suspended solids, sulfides, chromium, and plant tanning agents. It has high biochemical oxygen demand and high toxicity.

2. Composition

Sulfur containing wastewater: refers to the leaching waste liquid and corresponding washing process wastewater generated during the ash alkali method for hair removal in the leather making process;

Defatting wastewater: refers to the waste liquid and corresponding washing process wastewater generated by treating raw skin oil with surfactants in the defatting process of leather and fur processing.

Chromium containing wastewater: refers to the waste chromium liquid and corresponding water washing wastewater generated in the chrome tanning and chrome retanning processes.

Comprehensive wastewater: refers to various types of wastewater generated by leather and fur processing enterprises or centralized processing areas that are directly or indirectly discharged into the comprehensive wastewater treatment project (such as production process wastewater, factory domestic sewage, etc.).

3. Processing technology

Single processing technology

a、 Defatting wastewater

The pollution indicators such as oil content, CODcr, and BOD5 in degreasing waste liquid are high. The processing methods include acid extraction, centrifugal separation, or solvent extraction. The widely used method is acid extraction, which involves adding H2SO4 to adjust the pH value to 3-4 for emulsion breaking, stirring with steam and salt, and allowing it to stand at 40-60 t for 2-3 hours. The oil gradually rises to form an oil layer. The recovery of oil can reach 95%, and the removal of CODcr is over 90%. The general mass concentration of inlet oil is 8-10 g/L, and the mass concentration of outlet oil is less than 0.1 g/L. The recovered oil is deeply processed and converted into mixed fatty acids, which can be used for soap making.

b、 Soaking and depilation wastewater

The wastewater from ash leaching and hair removal contains protein, lime, sodium sulfide, and suspended solids, accounting for 28% of total CODcr, 93% of total S2-, and 70% of total SS. The treatment methods include acidification, chemical precipitation, and oxidation.

Acidification method is commonly used in production. Under negative pressure conditions, H2SO4 is added to adjust the pH value to 4-4.5, generating H2S gas, which is absorbed by NaOH solution to produce sulfide alkali for reuse. The soluble proteins precipitated in the wastewater are filtered, washed with water, and dried to become products. The removal rate of sulfides can reach over 90%, with CODcr and SS reduced by 85% and 95%, respectively. It has low cost, simple production operation, easy control, and shortened production cycle.

c、 Chrome tanning wastewater

The main pollutant in chrome tanning wastewater is the heavy metal Ce3+, with a mass concentration of about 3-4g/L and a weakly acidic pH value. The treatment methods include alkaline precipitation and direct recycling. 90% of domestic tanneries use alkaline precipitation method to add lime, sodium hydroxide, magnesium oxide, etc. to waste chromium solution, react and dehydrate to obtain chromium containing sludge, which can be dissolved in sulfuric acid and reused in the tanning section.

The pH value during the reaction is between 8.2-8.5, the temperature is 40 ℃ for precipitation, and magnesium oxide is used as the alkaline precipitant. The chromium recovery rate is 99%, and the mass concentration of chromium in the effluent is less than 1 mg/L. But this method is suitable for large tanneries, and the recovery of soluble oils, proteins, and other impurities in chromium sludge can affect the tanning effect.

Integrated processing technology

a、 Pre treatment system: mainly includes treatment facilities such as grilles, regulating tanks, sedimentation tanks, and air flotation tanks. The concentration of organic matter and suspended solids in tannery wastewater is high, and the pretreatment system is used to regulate the water quantity and quality; Remove SS and suspended solids; Reduce some pollution load and create favorable conditions for subsequent biological treatment.

b、 Biological treatment system: The ρ (CODcr) of tannery wastewater is generally 3000-4000 mg/L, and the ρ (BOD5) is 1000-2000mg/L, which belongs to high concentration organic wastewater. The m (BOD5)/m (CODcr) value is 0.3-0.6, suitable for biological treatment. At present, oxidation ditch, SBR and biological contact oxidation methods are widely used in China, while jet aeration method, intermittent biofilm reactor (SBBR), fluidized bed and upflow anaerobic sludge bed (UASB) are less commonly used.

4. Typical process flow

Leather wastewater treatment process

Leather wastewater treatment process

Treatment process of chromium containing wastewater in leather making