UASB reactor startup for the treatment of municipal wastewater followed by advanced oxidation process

Abstract

-The present study was done to shorten the start-up time of up-flow anaerobic sludge blanket (UASB) reactor. Two different nutrients were used during the UASB start-up period, which was designed to decrease the hydraulic retention time (HRT) from 48 to 24 and 12 to 6 hrs at average temperatures of 25-34 ºC. In the first stage, start-up was with glucose for 14 days and then the reactor was also fed with macro-and micronutrients as a synthetic nutrient influent (SNI) from 15 to 45 days as the second stage. For the control, a second reactor was kept on glucose feeding from day 1 to 45. The removal efficiencies of the chemical oxygen demand (COD) were 80% and 98% on the 6 th and 32 nd day of the first and second stage, respectively. The maximum substrate removal rate of 0.08 mg COD mg -1 VSS d -1 was observed for glucose and synthetic nutrient influent (SNI) on the 8 th and 40 th days, respectively. When the reactor reached the maximum COD removal efficiency it was then shifted to municipal wastewater (MWW) mixed with industrial wastewater. The HRT was reduced gradually with a one week gap while treating MWW. For further cleaning, the UASB effluent was treated with 40% waste hydrogen peroxide. The whole integrated treatment process was successful to reduce the COD by 99%, total suspended solids (TSS) by 73%, total nitrogen (TN) by 84% and turbidity by 67%.

Effectiveness of Phytoremediation Treatment of Pre-Treated Domestic Wastewater

“…However, the TDS value was very high compared to the Malaysian standard for wastewater disposal. Bhatti et al, (2014) has mentioned a high removal of all parameters during the conducted study except the removal of TDS which recorded very low removal during the treatment of UASB and H 2 O 2 which might explain the high TDS in this study. In the current study, two experimental conditions of the wastewater treatment using the S. molesta and water hyacinth plants were conducted for 5 days per each condition.…”

Evaluation of Anaerobic Digestion of Dairy Wastewater in an Innovative Multi-Section Horizontal Flow Reactor

“…The commonly used reactors types are UASB (Upflow Anaerobic Sludge Blanket) ones with biomass in the form of granules and EGSB (Expanded Granular Sludge Bed) ones as a variant of UASB reactor. Their disadvantages are the long start-up period (lasting from 3 to 5 months) and the necessity to pre-treat wastewater with high fat and suspensions concentrations [4]. Frequently used reactors are CSTRs (Continuous-flow Stirred Tank Reactors) with suspended biomass.…”

Effectiveness of two-stage horizontal subsurface flow constructed wetland planted with Cyperus alternifolius and Typha latifolia in treating anaerobic reactor brewery effluent at different hydraulic residence times

“…Nevertheless, an up-flow anaerobic sludge blanket (UASB) reactor-based the treatment is being implemented currently by a few brewery industries. UASB reactor-based treatment is an economically feasible and sustainable treatment approach for the generation of energy from wastewaters (Bhatti et al 2014;Aiyuk et al 2004). However, the final effluent of this reactor does not meet the national discharge guidelines due to the occurrence of high residual organic matter, nutrients, and pathogens (Yasar and Tabinda 2010;Foresti et al 2006).…”