Wastewater pretreatment methods primarily include physical, chemical, and biological methods. The specific methods are as follows: 1. Physical Pretreatment 1.1 Screens: Remove large particles (such as plastic and paper scraps) through interception. 1.2 Grit Chambers: Use gravity to separate inorganic impurities such as gravel and soil. 1.3 Grease Trap: Removes
The main differences between domestic and industrial wastewater treatment lie in the treatment targets, process flows, and pollutant types: 1. Differences in Treatment Targets Domestic wastewater treatment targets residential wastewater (including feces, laundry wastewater, etc.), with the core goal being to remove common pollutants such as chemical oxygen demand (COD),
The core differences between drinking water treatment and wastewater treatment lie in their treatment targets, objectives, and process flows: 1. Differences in Treatment Targets Drinking water treatment targets natural water sources (such as surface water and groundwater), aiming to remove suspended solids, microorganisms, and harmful substances to ensure water quality
1) Stable effluent quality: MBR uses membrane separation technology to achieve efficient solid-liquid separation. The effluent suspended solids content is less than 10 mg/L, and the turbidity is less than 1 NTU. The water quality is clear and transparent and can be directly reused in industrial cooling water and other
Based on the environmental functions and protection objectives of surface water bodies discharged from urban sewage treatment plants, as well as the treatment processes of the sewage treatment plants, standard values for conventional pollutants in basic control items are divided into primary, secondary, and tertiary standards. Primary standards are divided
It is necessary to select an appropriate combination of technologies based on the water quality characteristics. The following are common and efficient methods: 1. Chemical oxidation method 1.1 Fenton oxidation: Utilizes the reaction of Fe²⁺ with H₂O₂ to generate hydroxyl radicals (·OH), which can efficiently degrade refractory organic matter
Domestic sewage primarily consists of wastewater generated by households, businesses, and urban facilities, and contains the following components: 1) Organic pollutants These include proteins, fats, carbohydrates (such as cellulose, starch, and sugars), and urea, which are prone to producing foul odors under anaerobic conditions. 2) Inorganic pollutants These include elements
The composition of industrial wastewater varies significantly by industry, primarily encompassing the following categories: 1) Organic pollutants Common in industries such as petrochemicals, pharmaceuticals, and dyes, these pollutants include phenols, benzene series, polycyclic aromatic hydrocarbons, organic chlorides (such as carbon tetrachloride), and aldehydes (such as formaldehyde). Wastewater from industries such
The sludge treatment process mainly includes four core links: concentration, stabilization, dehydration and final disposal. Resource utilization is achieved through reduction, stabilization and harmless treatment. 1. Concentration: Reduce the moisture content of sludge from more than 95% to 90%-93% through gravity concentration or mechanical concentration, and reduce the volume by
1. Functional agents and auxiliary agents 1.1 Functional agents remove specific pollutants, while other agents prevent scaling, defoaming and cleaning. Common functional agents in sewage treatment processes include ammonia nitrogen removers, phosphorus removers, heavy metal capture agents, decolorizers, defoamers, etc. 1.1.1 Decolorizers: In the process of industrial sewage treatment, sewage
