During meetings, site inspections, or technical discussions in the water treatment industry, do you often hear a string of English acronyms or professional terms and feel lost? When faced with the "jargon" used by engineers, suppliers, or in project reports, comprehension hurdles can directly impact decision-making efficiency and communication quality. This article provides a quick reference list of vocabulary focused on practical communication scenarios, helping you rapidly grasp the key terms that frequently appear and are critical to operations and evaluation, making technical conversations easier.
► I. Core Water Quality Indicators: Understanding Water's "Health Report Card"
To assess water quality conditions or treatment effectiveness, several core indicators are indispensable. They are like a health report card for water, with data directly reflecting its level of "health."
► Dissolved Oxygen (DO)
This refers to the amount of oxygen dissolved in water. In wastewater treatment, it is crucial for the survival and activity of microorganisms. If the level is too low, microbial activity is insufficient, leading to a decrease in treatment efficiency; if it is too high, it signifies significant energy consumption from aeration. Balancing DO concentration and energy use is a common operational challenge.
► Five-Day Biochemical Oxygen Demand (BOD₅)
This measures the amount of oxygen required by microorganisms to break down organic matter in water. A higher BOD₅ value indicates a greater amount of organic pollutants in the water, which can easily cause the water body to turn black and produce foul odors. This indicator is often used to assess the biodegradability of wastewater and is a key basis for designing biological treatment processes.
► Chemical Oxygen Demand (COD)
Similar to BOD₅, this measures the amount of oxygen consumed by organic matter, but it is determined using a strong chemical oxidant. Consequently, the COD value is typically higher and covers a broader range of substances. A high COD level often indicates severe water pollution and greater treatment difficulty. It is a key parameter for evaluating the degree of water pollution and the effectiveness of many industrial wastewater treatment processes.
► II. Common Process Equipment: Getting to Know the "Main Units" on Site
A water treatment plant is composed of various process units. By understanding the function of the core equipment, you can generally comprehend a process flow diagram.
► Dissolved Air Flotation (DAF) Unit
Its principle is to remove light suspended solids (like grease and fine particles) that are difficult to settle by releasing a multitude of micro-bubbles. These solids adhere to the bubbles and float to the surface for removal. It is particularly suitable for the pretreatment of oily wastewater and food processing wastewater, addressing the challenge of "impurities that neither float nor settle easily."
► Membrane Bioreactor (MBR)
It combines conventional biological treatment with membrane filtration technology, using membrane modules to replace the secondary clarifier. Its main advantages are producing high-quality, clear effluent, effectively controlling sludge bulking, reducing sludge production, and requiring a relatively small footprint. It is often used in projects with high requirements for effluent quality and land area.
► III. A Quick Guide to Industry Acronyms: Decoding the "High-Frequency Codes" of Engineers
Acronyms are commonly used in industry communication. Mastering the following few will help you quickly keep up with discussions.
SS: Suspended Solids. Refers to solid materials in water that can be retained by a filter membrane. It is a fundamental indicator for measuring water turbidity and pollution levels.
TDS: Total Dissolved Solids. Refers to the total amount of all inorganic salts and organic matter dissolved in water. It is often used to evaluate the purity of water, such as for drinking water or boiler feed water.
SV30: Sludge Volume Index (30 min). Refers to the percentage of volume occupied by settled sludge after the mixed liquor from an aeration tank has been left to stand for 30 minutes. It is an empirical indicator for quickly assessing the settling performance and activity of sludge, providing valuable reference for daily operational control.
MLSS: Mixed Liquor Suspended Solids. Refers to the concentration of activated sludge in the aeration tank. It is one of the key control parameters for maintaining the stable operation of a biological treatment system.
► IV. Key Process Selection: The Applicability of Anaerobic and Aerobic Treatment
Based on treatment goals and wastewater characteristics, the main biological treatment processes are divided into two major categories: anaerobic and aerobic.
Anaerobic Treatment: Under oxygen-free conditions, organic matter is decomposed by anaerobic microorganisms. Its main advantages are low energy consumption and the ability to generate biogas for energy recovery. It is especially suitable for treating high-concentration organic wastewater, such as from certain food processing and brewing industries.
Aerobic Treatment: Under oxygenated conditions, pollutants are degraded by aerobic microorganisms. This is currently the most widely used biological treatment method. It effectively removes BOD, has high treatment efficiency, and is commonly used for municipal sewage and most low-to-medium concentration industrial wastewaters.
Understanding water treatment is essentially about following water through a purification journey of "physical separation, biological transformation, and chemical disinfection." In this process, DO is the source of respiration that sustains microbial life, BOD/COD is the quantitative list of pollutants to be removed, and the various process equipment units are the specialized purification teams working in concert. Mastering these core terms is like obtaining a key to unlock professional dialogue and understand the logic of the technology.