Refractory membrane concentrate generated from the membrane bioreactor (MBR) process remains a big challenge. With high pollution loads, high salinity and low biodegradability, membrane concentrates are difficult to be treated by conventional biological treatments. In this work, photosynthetic bacteria (PSB) were employed to handle this problem. The results showed that PSB could simultaneously remove COD, NH₃-N, NO₃⁻-N, salinity and chroma from the membrane concentrate. The removal efficiency of COD, NH₃-N, NO₃⁻-N, salinity and chroma reached 24.0%, 78.0%, 81.6%, 57.0% and 60.0% respectively. Dark-aerobic condition was more beneficial for pollutants removal. The tolerance mechanism of PSB in treating membrane concentrate was then analyzed. The contents of protein and carotenoid in PSB increased by 38.7% and 20.7% due to the defense stress effects. The content of bacteriochlorin decreased by 42.9% while the content of coenzyme Q₁₀ was stable at 8.4–8.8%.

膜生物反应器（MBR）工艺产生的难熔膜浓缩液仍然是一个很大的挑战。在高污染负荷，高盐度和低生物降解性的情况下，难以通过常规的生物处理方法来处理膜浓缩物。在这项工作中，采用光合细菌（PSB）处理此问题。结果表明，PSB可以同时去除膜浓缩液中的COD，NH ₃ -N，NO ₃ ^-- N，盐度和色度。COD的除去效率，NH ₃ -N，NO ₃ ^--N，盐度和色度分别达到24.0％，78.0％，81.6％，57.0％和60.0％。深色有氧条件更有利于去除污染物。然后分析了PSB处理膜浓缩液的耐受机理。PSB中蛋白质和类胡萝卜素的含量由于防御胁迫效应而分别增加了38.7％和20.7％。细菌绿素的含量下降了42.9％，而辅酶Q ₁₀的含量稳定在8.4-8.8％。