Purpose　of　Review　Membrane　techniques　have　been　employed　to　concentrate　livestock　manure　effluent　from　anaerobic　digestion　to　produce　highly　concentrated　liquid　organic　fertilizer.　This　review　aims　to　provide　a　comprehensive　understanding　on　the　opportunities　and　challenges　of　membrane　processes　in　the　concentration　of　digested　effluent　for　their　further　implementation.　Recent　Findings　Anaerobic　digestion　has　been　deployed　to　convert　livestock　manure　into　biogas　(energy)　and　digestate　with　high　potential　as　biofertilizer.　Digestate　can　be　separated　into　a　solid　and　liquid　fraction　to　reduce　required　capacity　for　onsite　storage.　The　liquid　fraction,　known　as　digested　effluent,　remains　a　vexing　challenge　to　digestate　management　due　to　the　contradiction　between　its　continuous　production　and　seasonal　application　to　farmlands,　particularly　in　developing　countries.　Recent　investigation　has　demonstrated　the　promise　of　membrane　techniques　for　the　concentration　of　digested　effluent　to　recover　recycling　water　and　produce　nutrient-rich　liquid　fertilizer.　These　techniques　mainly　include　hydraulically　driven　membrane　processes　(from　microfiltration　to　reverse　osmosis),　forward　osmosis,　membrane　distillation,　and　electrodialysis.　In　most　cases,　these　membrane　techniques　are　hybridized　to　enhance　the　concentration　efficiency.　Nevertheless,　the　practical　application　of　these　membrane　processes　is　hindered　by　several　technical　challenges,　which　mainly　include　membrane　fouling,　contaminant　enrichment,　ammonia　volatilization,　and　high　economic　input.　In　this　paper,　we　critically　reviewed　the　performance　of　different　membrane　processes　in　the　concentration　of　digested　livestock　manure　effluent.　Key　technical　challenges　and　their　potential　countermeasures　were　elucidated.　Furthermore,　future　perspectives　were　provided　to　shed　light　on　further　development　of　membrane　concentration　techniques　in　the　field.