What is the effluent standard for Class 1A?

1 Answers
Delaney
07/25/25 4:52am
Class 1A standard is the basic requirement for the effluent of urban sewage treatment plants to be used as reclaimed water. The effluent standards for Class 1A are as follows: 1. Chemical Oxygen Demand (COD) -- 50mg/L. 2. Biochemical Oxygen Demand (BOD) -- 10mg/L. 3. Suspended Solids (SS) -- 10mg/L. 4. Animal and Vegetable Oils -- 1mg/L. 5. Petroleum -- 1mg/L. 6. Anionic Surfactant -- 0.5mg/L. 7. Total Nitrogen (TN) -- 15mg/L. 8. Ammonia Nitrogen (NH3-N) -- 5 (8) mg/L. 9. Total Phosphorus (TP) -- 0.5mg/L.
Was this review help?
3
2
Share
More Forum Discussions

What does the China VI emission standard mean?

China VI emission standard means a 50% reduction in carbon monoxide emissions, a 50% decrease in the emission limits for total hydrocarbons and non-methane hydrocarbons, and a 42% stricter limit on nitrogen oxide emissions. Below is a detailed introduction to the China VI emission standard: 1. China VIa: China VIa serves as a transitional phase between "China V" and "China VI." China VIa will be implemented for gas-powered vehicles on July 1, 2019, for urban vehicles (such as city buses, sanitation trucks, postal vehicles, etc.) on July 1, 2020, and for all vehicles on July 1, 2021. 2. China VIb: China VIb is the true "China VI" emission standard. China VIb will be implemented for gas-powered vehicles on January 1, 2021, and fully implemented for all vehicles on July 1, 2023.
17
1
Share

What is the fuel consumption of the transmission?

An automobile transmission requires approximately 4 liters of oil. The following are the functions of the transmission: 1. Change the transmission ratio: Expand the range of torque and speed changes of the driving wheels. 2. Reverse driving: Enable the car to drive in reverse while maintaining the same rotation direction of the engine. 3. Change speed: The transmission, also known as the gearbox, is a mechanism used to alter the speed and torque from the engine, capable of fixing or changing the transmission ratio between the output shaft and the input shaft in different gears. Here are some extended maintenance tips for the transmission: 1. Check oil quality and quantity: Inspect the oil quality and quantity according to the intervals specified by the manufacturer. 2. Replace oil: Regularly replace the oil with products that meet the manufacturer's specifications. 3. Transmission repair: Have the transmission serviced at a professional repair facility.
20
2
Share

What to Do If You Drop Your Car Keys Inside the Car and Can't Find Them?

Methods to start the car when the keys are left inside: 1. Use the spare key: Generally, when purchasing a car, there is a spare key included in the vehicle's manual and common tools. To use the spare key, first locate a square or circular panel on the driver's side door handle and pry it open. After removing the lock cover, you will find the mechanical key hole. Insert the spare key to unlock the door. 2. Remote unlocking via smartphone: This requires installing a car key system, which allows you to unlock the car remotely via your phone without damaging the car's system. However, there are drawbacks—if the vehicle is in an area with poor signal or interference, this system may not work.
14
2
Share

What is the difference between the Dodge Challenger and the Hellcat?

The differences between the Dodge Challenger and the Hellcat are as follows: 1. Different exterior dimensions: The Dodge Challenger measures 5022mm in length, 1924mm in width, and 1450mm in height; the Hellcat measures 5017mm in length, 1923mm in width, and 1448mm in height. 2. Different engines: The Dodge Challenger is equipped with a 3.6L V6 engine; the Hellcat is equipped with a 6.2L V8 engine. Other differences include: Different maximum torque: The Dodge Challenger has a maximum torque of 368 N・m at 4800 rpm; the Hellcat has a maximum torque of 881 N・m at 4800 rpm.
12
1
Share

Which country is Shell from?

Shell engine oil originates from the Netherlands, as Shell is a Dutch company with a wide distribution network. Shell Helix passenger car lubricants are categorized in several ways. By series, they include Ultra, Extra, Special, Red Helix, and White Helix. By packaging, they are distinguished as Gray Shell, Blue Shell, Yellow Shell, Red Shell, and White Shell. Due to the extensive range of Shell series, distinguishing them by packaging and series can be confusing. Therefore, they are categorized below by full synthetic, semi-synthetic, and mineral oils. Full synthetic lubricants include the Ultra series and HX8; semi-synthetic lubricants include HX7, HX7AJ, and HX6; mineral oils include HX5, HX3, HX3K, and HX2. Each Shell series product focuses on cleaning performance, which is understandable. Every brand of lubricant has its own strengths and weaknesses, and Shell Helix lubricants emphasize cleaning performance. Lubricants with various characteristics cater to different engine needs. When purchasing, car owners can choose based on their driving conditions to ensure optimal engine performance and longevity.
15
0
Share

What are the advantages and disadvantages of new energy vehicles?

Advantages of new energy vehicles: 1. Low usage cost: The electricity cost per 100 kilometers is about 8 yuan, similar to the price of 1 liter of fuel; 2. No license plate restrictions: In large cities where license plate restrictions are common, new energy vehicles do not have this issue; 3. Smooth driving: No gear shifting impact. Most new energy vehicles use single-speed transmissions, eliminating gear shifting impact; 4. More environmentally friendly: Contribute to environmental protection efforts; 5. Saves fuel energy: Typically powered by natural gas, petroleum gas, hydrogen, or electricity; 6. Reduces exhaust emissions, effectively protecting the environment: Electric vehicles produce no exhaust and no pollution; hydrogen-powered vehicles emit only water, causing no environmental pollution. Disadvantages: 1. Slow charging: As new energy vehicles are still in the early stages, the technology is not yet mature. Charging is relatively slow, taking several hours. 2. Low vehicle ownership makes charging, refueling, and maintenance less convenient: Charging is difficult due to limited popularity. 3. Short driving range: Generally, the vehicle displacement is small, with insufficient power, making them unsuitable for long-distance travel. 4. High price: Currently, new energy vehicles priced between 50,000 to 100,000 yuan are mostly pure electric vehicles with limited production options.
12
2
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.