Polyhydroxyalkanoates (PHAs) are a replacement of conventional single-use plastics. Bioprocess conditions of the extreme halophilic archaeon Halogeometricum borinquense strain RM-G1 were selected resulting in the synthesis of 66.80 +/- 1.69 % PHA (of cell dry mass) in 72 h using glycerol and tryptone as carbon and nitrogen sources respectively, yielding volumetric productivity of 0.206 +/- 0.006 gL(-1) h(-1) in a repeated batch process in a small-scale bioreactor where 20 % of the production medium was used as the inoculum for the subsequent batch. The purified PHA was characterized as poly(3-hydroxybutyrate-co-3-hydroxyvalerate) with 10.21 mol% 3-hydroxyvalerate content possessing glass transition temperature -12.6 degrees C, degradation temperature 285 degrees C, number average molecular weight 156,899 Da, weight average molecular weight 288,723 Da, polydispersity index 1.8 and melting temperatures 139.1 degrees C and 152.5 degrees C. Maximum (21.7 +/- 0.6 L m(-2) h(-1)) and average (17.2 +/- 0.6 L m(-2) h(-1)) flux values were their respective highest and crystallization time was its least (3.0 +/- 0.16 h) when Delta T was 90 degrees C and polytetrafluoroethylene membrane was applied for desalination of the bioreactor effluent by Direct Contact Membrane Distillation. While using polyvinylidene fluoride membrane, maximum 25.5 +/- 0.5 L m(-2) h(-1) and average 18.6 +/- 0.2 L m(-2) h(-1) fluxes were obtained and crystallization time decreased (3.25 +/- 0.16 h) even when Delta T was lowered by 20 degrees C.