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        "rendered": "<p>What is fermentation? It is a metabolic process in which microorganisms such as yeast, bacteria, or fungi convert sugars into acids, alcohol, gases, or other useful compounds, usually without oxygen. We build the stainless steel vessels where this reaction runs at production scale, so this guide covers both the biology and the equipment.<\/p>\n<nav>\n<ul>\n<li><a href=\"#biology\">What Is Fermentation in Biology?<\/a><\/li>\n<li><a href=\"#steps\">How Does the Fermentation Process Work Step by Step?<\/a><\/li>\n<li><a href=\"#types\">What Are the Main Types of Fermentation?<\/a><\/li>\n<li><a href=\"#submerged-vs-solid-state\">Submerged vs Solid-State Fermentation: What Is the Difference?<\/a><\/li>\n<li><a href=\"#equipment\">What Equipment Does Industrial Fermentation Run In?<\/a><\/li>\n<li><a href=\"#products\">What Products Come From Fermentation?<\/a><\/li>\n<li><a href=\"#choosing\">How Do You Choose a Fermentation Tank?<\/a><\/li>\n<li><a href=\"#faq\">Fragen und Antworten<\/a><\/li>\n<\/ul>\n<\/nav>\n<h2 id=\"biology\">What Is Fermentation in Biology?<\/h2>\n<p>In biology, fermentation is an anaerobic metabolic pathway. A cell breaks down a carbohydrate such as glucose to release energy without oxygen, and the sugar ends up as ethanol, lactic acid, carbon dioxide, or another reduced compound. Yeast, bacteria, and fungi all ferment, and each strain leaves its own signature product. That is why one word covers both the yogurt in a refrigerator and the citric acid made in a multi-stage industrial line.<\/p>\n<p>People also ask what fermentation is in biology specifically, because the word shows up in two different classrooms. In a biochemistry lecture it means the anaerobic pathway that regenerates NAD+ so glycolysis can keep running \u2014 the reason yeast and muscle cells can still extract energy when oxygen runs out. In an industrial context the meaning widens to almost any controlled microbial conversion, including aerobic ones. Both groups are talking about the same organisms doing the same chemistry; only the scale and the equipment change.<\/p>\n<p>The biology has barely changed since people first brewed beer. What has changed is where the reaction runs. A conical flask is enough for a classroom. A food, feed, or pharmaceutical producer needs a sealed vessel that can be sterilized, stirred, cooled, and monitored without interruption. We manufacture those vessels, so this article keeps one foot in the biology and the other in the tank. If you only want the textbook definition, an encyclopedia will do. If you need to know what the process actually runs in at 500L or 2000L, read on.<\/p>\n<h2 id=\"steps\">How Does the Fermentation Process Work Step by Step?<\/h2>\n<p>Whatever the organism, a production run follows the same sequence:<\/p>\n<ol>\n<li><strong>Medium preparation.<\/strong> Water, a carbon source such as glucose or molasses, nitrogen, and minerals are blended to feed the culture.<\/li>\n<li><strong>Sterilization.<\/strong> The vessel and medium are steam-sterilized so only the inoculated strain grows. On industrial tanks this happens in situ; nothing has to leave the vessel.<\/li>\n<li><strong>Inoculation.<\/strong> A prepared seed culture is transferred into the sterile medium under aseptic conditions.<\/li>\n<li><strong>Controlled fermentation.<\/strong> The tank holds temperature, pH, dissolved oxygen, foam, and feeding inside a narrow band while the culture grows and makes product.<\/li>\n<li><strong>Harvest and downstream.<\/strong> The broth leaves the tank for separation, and the vessel is cleaned and sterilized for the next batch.<\/li>\n<\/ol>\n<p>Step four is where the vessel earns its money. The core controls on <a href=\"https:\/\/www.unionclay.com\/product\/industrial-stainless-steel-fermentation-tank\/\">our industrial stainless steel fermentation tank<\/a> cover temperature, agitation speed, pH, dissolved oxygen (DO), foam, feed, air flow, and pressure, with in-situ steam sterilization between batches and a choice of 316L or 304 stainless steel. In our experience a run fails for boring reasons \u2014 a drifting pH probe, foam choking the exhaust filter \u2014 long before it fails for exotic biology. A tank that holds those variables steady is not a luxury; it is the process.<\/p>\n<h2 id=\"types\">What Are the Main Types of Fermentation?<\/h2>\n<p>Ask a biologist and you will get two classic types. Lactic acid fermentation converts glucose to lactic acid; it happens in muscle cells under heavy load and in Lactobacillus cultures that make yogurt, cheese, sauerkraut, and silage. Alcoholic fermentation is the yeast pathway: glucose becomes ethanol and carbon dioxide, which gives you beer, wine, and risen bread.<\/p>\n<p>Industry runs a wider menu. Acetic acid fermentation turns ethanol into vinegar. Other cultures produce citric acid, amino acids, enzymes, or antibiotics. Many of these industrial processes are actually aerobic \u2014 the organism still converts a feedstock into a useful product, but the tank must deliver controlled air flow instead of excluding oxygen. That detail matters when you specify the vessel.<\/p>\n<p>Engineers classify fermentation a different way: by how the microorganism is physically grown. Either the cells are submerged in a liquid broth, or they grow on a moist solid. That single distinction decides what the equipment looks like, and it is where most buying mistakes start.<\/p>\n<h2 id=\"submerged-vs-solid-state\">Submerged vs Solid-State Fermentation: What Is the Difference?<\/h2>\n<p><strong>Submerged fermentation<\/strong> suspends the culture in a liquid medium inside a stirred, aerated tank. Mixing is easy, heat moves out through the jacket, and pH and DO probes sit directly in the broth. Antibiotics, enzymes, amino acids, beer, and most bulk products are made this way.<\/p>\n<p><strong>Solid-state fermentation<\/strong> grows the culture \u2014 usually a fungus \u2014 on a moist solid substrate such as grain, bran, or straw, with little free water. Koji for soy sauce, fermented feed, and some enzyme and organic acid processes run this way. The bed holds heat, the substrate cannot be pumped, and loading is measured against the bed volume rather than a liquid fill line.<\/p>\n<p>That is why a solid-state vessel is specified differently. <a href=\"https:\/\/www.unionclay.com\/product\/stainless-steel-solid-state-fermentation-tank\/\">The stainless steel solid-state fermentation tank we build<\/a> carries a loading coefficient of 20-60% of total volume, and the range runs through 20L, 30L, 50L, 100L, 200L, 500L, 1000L, and 2000L. Construction is 316L stainless steel, stirring is rotary-shaft mechanical with a tray-type option available, and sterilization is external steam in situ. If your process grows a fungal bed on grain, a liquid-broth tank is the wrong tool no matter how good its controls are.<\/p>\n<h2 id=\"equipment\">What Equipment Does Industrial Fermentation Run In?<\/h2>\n<p>Every page ranking for this keyword describes fermentation as pure biology. None of them shows the vessel the product is actually made in. From the manufacturer&#8217;s side, three vessel types cover most of what we ship:<\/p>\n<table>\n<thead>\n<tr>\n<th>Reaktionsgef\u00e4\u00df<\/th>\n<th>Volume range<\/th>\n<th>Werkstoff<\/th>\n<th>Stirring<\/th>\n<th>Sterilization<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Industrial stainless steel fermentation tank<\/td>\n<td>Laboratory and pilot sizes up to production-scale configurations<\/td>\n<td>316L \/ 304 stainless steel<\/td>\n<td>Agitation speed among core controls<\/td>\n<td>In-situ steam sterilization<\/td>\n<\/tr>\n<tr>\n<td>Stainless steel solid-state fermentation tank<\/td>\n<td>20L to 2000L, 20-60% loading coefficient<\/td>\n<td>316L stainless steel<\/td>\n<td>Rotary-shaft mechanical stirring; tray-type option<\/td>\n<td>External steam in-situ sterilization<\/td>\n<\/tr>\n<tr>\n<td>Enzymolysis tank<\/td>\n<td>10L-5000L, customizable<\/td>\n<td>316L stainless steel cylinder + 304 stainless steel jacket<\/td>\n<td>Top mechanical or magnetic stirring<\/td>\n<td>SIP and CIP options<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>A project can be a single tank or a multi-stage fermentation system where seed, production, and holding vessels run in sequence. You can see how these three sit together in <a href=\"https:\/\/www.unionclay.com\/product-category\/fermentation-tank\/\">our fermentation tank category<\/a>, which groups every vessel family we manufacture for this process.<\/p>\n<p>Many lines also pair fermentation with enzymatic hydrolysis. Fermentation grows the culture; enzymolysis uses enzymes to break a substrate \u2014 protein, starch, plant fiber \u2014 into smaller molecules such as peptides or simple sugars, either preparing the feedstock before fermentation or refining the product after it. <a href=\"https:\/\/www.unionclay.com\/product\/enzymolysis-tank\/\">Our enzymolysis tank<\/a> is built for that reaction: 10L-5000L, customizable, with a 316L stainless steel cylinder and a 304 stainless steel jacket, top mechanical or magnetic stirring, basic controls for temperature, speed, pH, feeding, tank pressure, and liquid level, plus SIP and CIP options. If your process includes a hydrolysis step, say so at the inquiry stage \u2014 the control list changes the quotation.<\/p>\n<h2 id=\"products\">What Products Come From Fermentation?<\/h2>\n<p>The product list is longer than most people expect:<\/p>\n<ul>\n<li><strong>Food and drink:<\/strong> bread, beer, wine, yogurt, cheese, kimchi, and soy sauce brewed through a koji solid-state step.<\/li>\n<li><strong>Industrial chemicals:<\/strong> fuel ethanol, lactic acid, citric acid, and amino acids for feed and food.<\/li>\n<li><strong>Pharmaceuticals:<\/strong> antibiotics and other secondary metabolites from submerged aerobic cultures.<\/li>\n<li><strong>Enzymes:<\/strong> amylase, protease, and cellulase for detergents, textiles, and food processing.<\/li>\n<li><strong>Agriculture:<\/strong> fermented feed and silage from solid-state processes.<\/li>\n<\/ul>\n<p>Notice how the same products keep falling into the same two camps. Anything brewed as a liquid \u2014 beer, wine, vinegar, antibiotic broths \u2014 belongs in a submerged vessel with aeration and cooling. Anything grown on a moist solid \u2014 koji, fermented feed, silage \u2014 belongs in a solid-state vessel where the bed can be turned without being pumped. The enzymatic products, such as detergent-grade protease, often need both: a fermentation run to produce the enzyme and a hydrolysis vessel where that enzyme does its work on the substrate.<\/p>\n<p>Each product class tends to map to a vessel class. A brewery and a koji plant both &#8220;do fermentation,&#8221; yet one needs an aerated liquid tank and the other needs a stirred solid bed. Knowing your product tells you the biology; knowing the biology tells you the tank.<\/p>\n<h2 id=\"choosing\">How Do You Choose a Fermentation Tank?<\/h2>\n<p>This is the framework we run through with every customer before quoting:<\/p>\n<ol>\n<li><strong>Working volume.<\/strong> Size the vessel to the batch, not the building. For solid-state work, remember the 20-60% loading coefficient \u2014 a 100L tank holds far less than 100L of substrate.<\/li>\n<li><strong>Agitation.<\/strong> Liquid broths need controlled agitation speed; solid beds need rotary-shaft mechanical stirring or trays.<\/li>\n<li><strong>Temperature control.<\/strong> Confirm the jacket and control loop can hold your growth temperature through the exothermic peak of the culture.<\/li>\n<li><strong>Sterilization.<\/strong> Decide between in-situ steam, external steam, and SIP\/CIP based on your contamination risk and available utilities.<\/li>\n<li><strong>Sensors and downstream.<\/strong> List the probes you need \u2014 pH, DO, foam, pressure, level \u2014 and the separation equipment that follows the tank.<\/li>\n<\/ol>\n<p>If you are still working out what the vessel itself does, our article on <a href=\"https:\/\/www.unionclay.com\/what-is-a-bioreactor-fermenter-function-and-lab-uses\/\">what a bioreactor fermenter is and how it functions in lab use<\/a> covers the basics. When you are ready to specify, <a href=\"https:\/\/www.unionclay.com\/fermentation-tank-procurement-guide\/\">our fermentation tank procurement guide<\/a> walks through the full buying checklist in order.<\/p>\n<h2 id=\"faq\">Fragen und Antworten<\/h2>\n<h3>Is fermentation an aerobic or anaerobic process?<\/h3>\n<p>Classic fermentation is anaerobic \u2014 the cell gains energy without oxygen. In industry the word is used more loosely: many fermentation products such as antibiotics and enzymes come from aerobic cultures, and the tank supplies controlled air flow and monitors dissolved oxygen instead of excluding air.<\/p>\n<h3>What is a product of fermentation?<\/h3>\n<p>Ethanol, carbon dioxide, and lactic acid are the textbook products. At industrial scale the list extends to citric acid, amino acids, enzymes, antibiotics, fermented feed, and foods such as yogurt, cheese, and soy sauce.<\/p>\n<h3>What is the purpose of fermentation?<\/h3>\n<p>For the microorganism, the purpose is energy: fermentation lets the cell extract energy from sugar when oxygen is absent. For a producer, the purpose is conversion \u2014 turning a low-cost feedstock such as glucose or grain into a higher-value product that the culture makes better than chemistry can.<\/p>\n<h3>What size fermentation tank do I need?<\/h3>\n<p>Start from working volume per batch, then apply the vessel&#8217;s loading rules. Our solid-state line runs from 20L to 2000L with a 20-60% loading coefficient, and the enzymolysis range covers 10L to 5000L, customizable. When in doubt, send us your batch size and process type and we will size the vessel with you.<\/p>\n<h3>Does a fermentation tank need sterilization?<\/h3>\n<p>Yes. Contamination is the most common way to lose a batch. Our industrial tanks sterilize in situ with steam, the solid-state line uses external steam in-situ sterilization, and the enzymolysis range offers SIP and CIP options, so the vessel is cleaned and sterilized without being opened.<\/p>\n<p>Ready to move from definition to hardware? Send us your product, batch size, and whether the culture runs submerged or on a solid substrate, and we will come back with a sized vessel and a control list. Common questions about ordering, customization, and our equipment are answered on <a href=\"https:\/\/www.unionclay.com\/faq\/\">our FAQ page<\/a>.<\/p>",
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