Volatile Fatty Acids Recovery In A Reactive Primary Clarifier: A Pilot Case Study

Although the aim of primary clarifiers remains to remove particles, the removal of settleable solids affects downstream processes that rely on readily biodegradable oxygen demand (rbCOD) in proportion to nutrient removal demands. However, through some process modification the primary clarifier can be looked at as a physico-biochemical reactor able to accomplish: removal of settleable solids; increase rbCOD concentration in the primary effluent. Pilot-scale experiments were conducted at the 12 m³ water resource recovery facility of Université Laval to determine the effect of different factors on the fermentation process in a primary clarifier. The results showed that providing a sludge retention time larger than one day and a low recirculation flow rate from the bottom of the clarifier of about 15% of the influent flow rate are crucial factors for increased rbCOD concentration. They can lead to a VFAs yield up to 90 mgCH3COOHequivalent/gVSS, along with a 70% solids removal efficiency.

Volatile Fatty Acids Recovery In A Reactive Primary Clarifier: A Pilot Case Study

Although the aim of primary clarifiers remains to remove particles, the removal of settleable solids affects downstream processes that rely on readily biodegradable oxygen demand (rbCOD) in proportion to nutrient removal demands. However, through some process modification the primary clarifier can be looked at as a physico-biochemical reactor able to accomplish: removal of settleable solids; increase rbCOD concentration in the primary effluent. Pilot-scale experiments were conducted at the 12 m³ water resource recovery facility of Université Laval to determine the effect of different factors on the fermentation process in a primary clarifier. The results showed that providing a sludge retention time larger than one day and a low recirculation flow rate from the bottom of the clarifier of about 15% of the influent flow rate are crucial factors for increased rbCOD concentration. They can lead to a VFAs yield up to 90 mgCH3COOHequivalent/gVSS, along with a 70% solids removal efficiency.

Liquid marbles as biochemical reactors for the polymerase chain reaction

Liquid marbles can serve as a biochemical reactor for the polymerase chain reaction, eliminating the conventional single use plastic reaction vial.

BIOOXIDATION OF ORGANIC IMPURITIES OF WASTE LIQUIDS ON THE COMBINED BIOREACTOR

Activities of oil and gas companies are accompanied by the formation of liquid and pasteous hydrocarbon waste. A common way of dealing with these types of wastes is their placement, storage in specially equipped facilities (sludge reservoirs, ponds, anaerobic digestion, etc.). Сonsiders the major problems of processing of waste liquids of petrochemical complex with using biochemical reactor. Are presented the results of research of process of bio oxidation of organic matter in water-emulsion layer of waste storage using activated sludge plan.