A study to use activated sludge anaerobic combining aerobic for treatment of high salt seafood processing wastewater

Abstract

Seafood processing operations generate a high strength wastewater, which contain organic pollutants in soluble, colloidal, particulate form and salt content, up to 30g NaCl/L. This research aimed to study the effect of salt (NaCl) concentration on the treatment efficiency of seafood processing wastewater by the use of a laboratory-scale bioreactor, which is operated in anaerobic combining aerobic system with concentration salt different from 0-5%. The results showed that the wastewater from seafood processing with the chemical input parameters of pH = 7 -8.5, COD = 2000 mg / L, total nitrate nitrogen = 150 mg / L, NH 4+ = 90 mg / L, total phosphorus = 50 mg / L, salt content 3% was treated with anaerobic activated sludge content of 8000mg/l, 16HRT and combining an aerobic activated sludge content of 6000mg/l, 6HRT, DO=2-4mgO2/l with the acclimatization of 7% bacteria Bacillus velezensis at high salinity The parameters output wastewater was treated according to standards QCVN 11-MT:2015/BTNMT (column B).

Salinity is the major driver of the global eukaryotic community structure in fish-canning wastewater treatment plants

“…Salinity increases are usually linked to a worsening in the system performance (Pham and Nguyen, 2020;Cristóvão et al, 2016). However, the driving mechanisms of this common behaviour are generally unknown, and the effect of salinity over eukaryotic populations, which play a key role in wastewater treatment, has been rarely studied.…”

“…In this sense, different mechanisms to protect eukaryotic cells of the negative effect of NaCl have been developed by eukaryotes (Fuentes et al, 2016;Harding and Simpson, 2018;Vashishtha and Meghwanshi, 2018). Besides, Pham and Nguyen (2020) previously reported that the efficiency of CAS systems was significantly affected under NaCl contents >3% due to cell lysis. The results presented here indicate that a broader eukaryotic diversity could reduce the negative effect of NaCl and promote the colonization of the different ecological niches.…”

“…Fish canning effluents require treatment before their disposal to prevent environmental damage, but they are characterized generally by a high content of salt and organic matter (including oil and grease), which makes their treatment particularly difficult (Val del Rio et al, 2018). These processes are performed in wastewater treatment plants (WWTPs), which usually include primary units aimed to remove particulate matter and oils by physicochemical treatments, and in some cases secondary units that normally consist of biological reactors for the removal of dissolved matter (Pham et al, 2020).…”

Treatment of Fish-Processing Wastewater Using Polyelectrolyte and Palm Anguish

“…To prevent environmental damage, fish-processing wastewater requires treatment before disposal. The normal performance of treatment processes of fish wastewater within the wastewater treatment plants includes physicochemical treatments as primary units for the removal of oils and the particulate matter followed by biological reactors (oxidation basin) for the removal of dissolved organic materials with the aid of activated sludge [4]. The conventional treatment using activated sludge systems are widely employed to treat both industrial and urban wastewater due to their adaptability and flexible operations.…”

An integrated pilot scale UASB and aerotank system for the treatment of rice paper production wastewater: A case study from Phu Hoa Dong, Ho Chi Minh City, Vietnam

“…There was a gradual increase in the microbial concentration over the 7-day period. The wastewater from rice paper manufacturing facility is rich in carbon sources, and the aerobic microorganisms can thrive in the aerotank because of the oxygen supplied from the aerated system [20,21,22]. In their study, Fan et al [20] reported that, when high levels of total phosphorus (TP), suspended solids (SS), and chemical oxygen demand (COD) were present in the wastewater, the MLSS was positively correlated, while the in uent ammonia levels were negatively associated with the MLSS.…”