13.-0157. Biogas.
13.-0156. Biogas reactor.
13.-0155. Biogas combustion.
13.-0154. Biofilm.
13.-0153. Biodiversity.
13.-0152. Biodegrading - Biological decomposition.
13.-0151. Biodegradation.
13.-0150. Biodegradable.
13.-0149. Biochemical Oxygen Demand ( BOD ).
13.-0148. Bio-char.
13.-0147. Bio-additive.
13.-0146. Bin composting.
13.-0145. Best practice.
13.-0144. Benefits.
13.-0143. Beneficiary assessment.
13.-0142. Bedrock.
13.-0141. Bedrock aquifers.
13.-0140. Bay.
13.-0139. Batch reactor.
13.-0138. Basin.
13.-0137. Basin irrigation.
13.-0136. Basicity.
13.-0135. Basic sanitation.
13.-0134. Basement.
13.-0133. Baseflow.
13.-0132. Base.
13.-0131. Base of the pyramid.
13.-0130. Bar rack.
13.-0129. Bank filtration.
13.-0128. Bacteriological analysis.