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2. Pressure Rating The pressure rating of a pressure washer, measured in pounds per square inch (PSI), significantly affects its price. Lower PSI units (around 1,300-1,500 PSI) are ideal for delicate surfaces and cost less, while high-end models (over 3,000 PSI) offer intense cleaning power, suitable for professionals and heavy-duty applications. As expected, higher PSI models come with higher price tags.
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Traditional methods for treating inorganic wastewater include physical, chemical, and biological processes. Physical methods, such as sedimentation and filtration, can remove suspended solids but may not effectively eliminate dissolved inorganic contaminants. Chemical methods, like precipitation and ion exchange, can efficiently remove heavy metals but often involve the use of hazardous chemicals and generate secondary waste that requires further treatment. Biological methods, although more environmentally friendly, are generally less effective for removing inorganic pollutants.
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Penicillin, a pioneer among antibiotics, once had a production process that caused significant environmental pollution. In recent years, with the application of eco-friendly pharma intermediates, penicillin production has become cleaner and more efficient. For instance, using biocatalysis instead of chemical catalysis not only increases penicillin yield but also significantly reduces wastewater and gas emissions, achieving green production processes. Additionally, optimizing fermentation techniques has improved the biosynthesis efficiency of penicillin, reduced chemical synthesis steps, and lowered energy and resource consumption.