Using Chemically Enhanced Primary Treatment (CEPT) as a Pretreatment Option for Anaerobic Digestate from Cattle Manure Digestion System

Gong, Weijia; Luo, Lijun; Li, Wenzhe; Luo, Xinsheng; Liang, Heng; Ngo, Huu Hao; Guo, Wenshan

doi:10.3390/w9070487

Cited by 5 publications

(1 citation statement)

References 30 publications

(15 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Lin, Li, Li, Xu, and Li (2017) and Gong et al (2017) achieved very high TP removal efficiency (>96%) compared to the removal efficiency achieved by this study (84%) which could be attributed to the higher dosage of FeCl 3 used by the two studies compared to the current study. A FeCl 3 dose of 58 mg FeCl 3 /L (20 mg Fe/L) and no polymer was used by and the dosage applied by Gong et al (2017) was 40 mg FeCl 3 /L (14 mg Fe/L) together with 0.2 mg/L of anionic PAM (Table 2). Figure 3 depicts the methane production profile per gram COD fed of the primary sludge obtained from control and test clarifiers.…”

Section: Cept Performancecontrasting

confidence: 59%

The impact of chemically enhanced primary treatment on the downstream liquid and solid train processes

Shewa

Tang

et al. 2019

Water Environment Research

View full text Add to dashboard Cite

The use of chemical coagulants and flocculants to supplement chemically enhanced primary treatment (CEPT) processes is increasing in popularity as it has been demonstrated to improve carbon redirection and suspended solids and phosphorus removal. Dosing 15 mg ferric chloride/L of wastewater and poly aluminum chloride (PACl; 0.5 mg/L) to the influent of a primary clarifier successfully achieved improved carbon redirection and suspended solids removal at a full‐scale WWTP. In this study, the impacts of PACl on the downstream liquid and solid train processes of the same WWTP were investigated. Compared to FeCl3 addition, a combined PACl and FeCl3 addition to the primary influent reduced the TSS and TP concentrations of the secondary clarifier effluent by 20% and 33%, respectively. Effluent BOD5 and ammonia‐nitrogen concentrations of the downstream activated sludge process were not affected by the addition of a combined FeCl3 and PACl in the primary clarifier. PACl addition affects the bioavailability of carbon and hence reduced the methane production efficiency of the primary sludge by 20%–30%. However, the significant amount of carbon concentrated in the CEPT sludge would enhance the amount of energy recovered through incineration. Practitioner points The chemically enhanced primary treatment process is an attractive method for carbon redirection and energy recovery. The combined FeCl3 and PACl addition in the primary clarifier improves the full scale activated sludge process effluent quality. PACl has a negative effect on methane production.

show abstract

Section: Cept Performancecontrasting

confidence: 59%