NOVELTY - Thermoplastic composition or thermoset composition comprises one or more of a covalently modified microbial biomass from an oleaginous microbe and a non-covalently modified biomass from a heterotrophically cultivated microbe, where the microbial biomass optionally comprises from 0.25% to 90% triglyceride by dry cell weight; the thermoplastic composition optionally further comprises one or more plant polymers.    USE - The compositions are useful for producing paper product, triglyceride, film, and injection molded article (all claimed) such as packing materials, bottles, containers, bags, coatings, tableware, labels, adhesive labels, toys, handles for items such as razors, scissors, cooking utensils, and tools, components of shoes, luggage, and backpacks, frames for glasses and sunglasses, jacket casings for cables and wires, housing elements for electronics such as computers, phones, cameras, printers, photocopiers, stereos, and clocks, as well as automobile, airplane, and rail parts including objects for passenger vehicle interiors.    ADVANTAGE - The invention is based on the realization that biomass, particularly residual biomass that remains after cell lysis, especially of microalgae cultured heterotrophically, is a valuable product, the utilization of which confers substantial overall economic advantage to using the cells as production organisms for making fatty acids or other high value products. Indeed, the economic advantage gained may outweigh the expense associated with the lysis of the cell walls. Judicious use of the residual biomass may compensate for loss of efficiency in the process resulting from conversion of sugar and cell-energy to cell wall synthesis rather than toward production of the desired product. The invention also allows for recovery and potential recycling of valuable nutrients used in the culture of the microalgae.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are:    (1) a blended composition comprising the thermoplastic composition, and a second thermoplastic composition;    (2) an absorbent composition comprising microbial biomass from a microbe covalently modified with a hydrophilic moiety and where the composition is optionally cross-linked;    (3) a method of making an adsorbent material, comprising: (a) preparing biomass from a microbe; and (b) hydrothermally carbonizing the biomass, thus making the adsorbent material;    (4) a paper product comprising 0.1-50% biomass from heterotrophically cultivated microbes;    (5) a method of making a thermoplastic composition or a thermoset composition, comprising: (a) providing biomass from heterotrophically cultivated microbes; (b) acylating the polysaccharides within the biomass, where the acylating is optionally acetylating; (c) adding one or more of a plasticizer, an additional polymer, a filler, or a cross-linking agent; and (d) optionally adding one or more plant polymers;    (6) a process for producing triglyceride comprising: (a) heterotrophically cultivating microalgal cells in a culture medium comprising crop-derived sugar so as to produce triglyceride inside the cells; (b) removing the triglyceride from the cells to produce an oil and a residual biomass; (c) hydrothermally carbonizing a water soluble fraction and/or water insoluble fraction of the biomass to produce a carbonized product and a nutrient-rich aqueous solution; and (d) repeating the process with recycling of the nutrients of the nutrient-rich aqueous solution to step (a) to support the cultivation of additional microalgal cells or using the nutrients of the nutrient-rich aqueous solution in the growing of crops;    (7) a composition comprising a blend of a moldable polymer, a microalgal biomass, and optionally a lipid selected from a triacylglyceride, a fatty acid, a fatty acid salt, a fatty acid ester, and one or more combinations, where the microalgal biomass is optionally covalently modified and is obtained from a heterotrophic oleaginous microalgae;    (8) a film comprising the composition; and    (9) an injection molded article comprising the composition.