TECHNOLOGY FOCUS - BIOLOGY - Preferred Method: The method (M1) further involves producing volatile fatty acids from organic waste or inexpensive organic materials before the step (a) or (b). Preferred Components: The microorganisms are selected from bacteria, yeasts, fungi and microalgae. The remaining microorganisms after recovering the microbial intracellular products from the culture medium of the bioreactor for production of microbial intracellular products are used as a microbial strain for production of volatile fatty acids. The microbial intracellular products are selected from intracellular proteins, intracellular organic polymers, and microbial lipids.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: Each of the bioreactor for microbial growth and the bioreactor for production of microbial intracellular products comprise a reactor for multi-stage continuous high-cell-density culture (MSC-HCDC), and the bioreactor for microbial growth is operated in the form of a continuous stirred tank reactor (CSTR), and the bioreactor for production of microbial intracellular products is operated in the form of several CSTRs or is operated in the form of a plug flow reactor (PFR) provided by dividing the inside of one CSTR into several sections. The bioreactor for microbial growth is for growing of microorganism, and the bioreactor for production of microbial intracellular products is for producing of microbial intracellular products by fed-batch culture using volatile fatty acids as substrates.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The volatile fatty acids are selected from acetic acid, propionic acid, butyric acid, lactic acid, succinic acid, gluconic acid, valeric acid and/or caproic acid. The organic waste is selected from urban waste, food waste, sludge, livestock excretions and organic biomass. The medium of microorganisms in the bioreactor for microbial growth contains (1) a carbon (C) source selected from glucose, xylose, arabinose, sugar, alcohol, sugar alcohol and/or saccharification product of biomass, and (2) nitrogen (N) source selected from ammonia-derived compounds, nitric oxide, urea, corn steep liquor and/or food waste. The volatile fatty acid-containing medium which is included in the bioreactor for production of microbial intracellular products contains, in addition to the volatile fatty acids, the carbon source (1) and the nitrogen source (2). The volatile fatty acid is maintained at a volatile fatty acid concentration of 1-5 g/l during culture in the bioreactor. EXAMPLE - No suitable example given.