Zhongnan Environmental ProtectionShandong Zhongnan Environmental Protection Equipment Co., Ltd.Standard interpretation, process principles, selection calculations, and O&M guidelines are compiled from equipment and engineering practice for direct reference by engineers and operations staff.
Oversized discharge limits are often rooted in selection errors made during the design phase. This article outlines five key criteria for selecting wastewater treatment equipment: effluent standards, peak flow rates, water quality fluctuations, process compatibility, and total lifecycle costs.
Food wastewater characteristics are strongly linked to product type, production processes, and cleaning practices. This article outlines essential pre-treatment parameters and sampling methods, including flow rate fluctuations, COD and BOD5, suspended solids and oils/fats, nitrogen and phosphorus levels, pH, temperature, salinity, specific pollutants, and discharge destinations.
Construction camp sewage exhibits significant fluctuations in volume with no municipal pipe network available. This article outlines key selection criteria for camp domestic wastewater treatment, covering water quality and quantity analysis, pretreatment, biological processes, equipment configuration, and operations & maintenance.
Laboratory wastewater has complex composition; selecting equipment based on domestic sewage approaches often leads to failures during acceptance. This article outlines five common misconceptions and clarifies the proper placement of source separation, pretreatment by quality, and disinfection processes.
The new national standard GB13457-2025 for slaughterhouse wastewater in 2026 is now fully implemented, introducing three new assessment items: total nitrogen, total phosphorus, and color. Existing limits have been tightened across the board. This article explains the key changes in the new regulation, analyzes the causes of non-compliance in slaughterhouse wastewater, and provides targeted retrofitting solutions.
Advanced oxidation technology based on hydroxyl radicals integrates core technologies including UV nanophotocatalysis, ozone oxidation, and high-efficiency air-water mixing. With no chemical additives, it delivers efficient disinfection and algae control, COD/BOD degradation, and scale/rust prevention. Suitable for drinking water, swimming pools, landscape water, aquaculture, and industrial recirculating systems.
Tibet, Gannan, and other high-altitude regions feature unique climate and water quality conditions characterized by low temperatures, low atmospheric pressure, reduced oxygen levels, intense UV radiation, and significant day-night temperature fluctuations. This guideline draws on practical engineering experience in high-altitude wastewater treatment to systematically address the factors limiting microbial growth, carbon source compatibility patterns, standards for bacterial cultivation and acclimatization, standardized operation and maintenance parameters, and troubleshooting procedures.
As urban wastewater discharge standards continue to tighten, total nitrogen limits are becoming increasingly restrictive. This paper systematically explains the carbon demand mechanisms in biological denitrification, principles for selecting external carbon sources, performance differences among common carbon sources, and engineering optimization strategies. It provides technical guidance for wastewater treatment plants to reduce costs, improve efficiency, and ensure consistent compliance.
Activated sludge is the most widely used mainstream process for wastewater treatment today. However, on-site operations frequently encounter issues such as failed biomass cultivation, sludge bulking, aging sludge, microbial toxicity, solids carryover in secondary clarifiers, excessive surface foaming, sludge flotation, and sludge disintegration. Although these failure symptoms appear complex and variable, they follow underlying patterns with actionable, targeted solutions.
Coagulation-flocculation performance directly impacts the operational stability of downstream units. This paper systematically introduces the characteristics, applicable scenarios, and dosage calculation methods for common coagulants.
UV disinfection dose is the core parameter for ensuring effective disinfection. This article provides a detailed guide on calculating UV dose, configuring lamp power, and designing disinfection systems.
Food processing wastewater is characterized by high organic content and large amounts of oil and grease. This paper analyzes the performance of flotation equipment through a practical case study.
Selecting the right MBR membrane module directly impacts system performance and capital costs. This guide provides a systematic selection approach covering membrane material, pore size, and module configuration.
Submerged integrated equipment operates continuously in a damp underground environment, where the quality of anti-corrosion and thermal insulation directly impacts its service life. This article covers common anti-corrosion coating systems, selection criteria for insulation materials, construction processes, and key quality control measures.