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Foshan, China

Li K.,Harbin Institute of Technology | Tian J.-Y.,Harbin Institute of Technology | Ye T.-J.,Foshan Water Group Co. | Wang P.-N.,Hebei University of Engineering | And 3 more authors.
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology

To evaluate the feasibility of hybrid process of coagulation, sedimentation and immersed ultrafiltration (UF) for the drinking water treatment from Bei River source water, pilot study was performed in terms of pollutants removal and membrane fouling. The performance of the hybrid UF process was also compared with that of the conventional process in the full-scale drinking water treatment plant. Results showed that in the conventional treatment process, there was still 0.176 NTU of turbidity in the sand-filtration effluent on average; while it was only 0.080 NTU in the hybrid UF process. The removal efficiencies of conventional treatment process for COD Mnand UV 254 were 47.5% and 42.3%, respectively, which were slightly lower than the 50.6% and 44.0% achieved by the hybrid UF process. As for the membrane fouling, it was shown that the trans-membrane pressure (P ™) would increase rapidly when direct UF of raw water was carried out. However, in the hybrid UF process, due to the pre-removal of membrane foulants by coagulation and sedimentation, the P ™ development rate became much lower; and stable operation of the UF could be achieved. It is demonstrated that the hybrid UF process can improve the security of drinking water supply. Source

Liu Y.,Beijing University of Technology | Li X.,Beijing University of Technology | Yang Y.,Beijing University of Technology | Ren J.,Beijing University of Technology | And 3 more authors.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology)

An integrated process of powdered activated carbon (PAC) and ultrafiltration (UF) was used to treat a micro-polluted water. Effects of PAC dosages on turbidity, UV254 and CODMn removal, as well as membrane fouling were investigated. Effects of PAC retention-time on organic removal was conducted simultaneously. The results indicate that the effluent turbidity is under 0.1000 NTU, which could not be influenced by PAC dosage and the turbidity of influent. Organics removal is enhanced with the increase of PAC dosage at 10, 20 and 40 mg/L, but the performance of unit PAC mass is reduced. It could meet the demand of economics and effluent quality at the dosage of 10 mg/L PAC. Organics removal is decreased with the increase of PAC retention-time, and the decline is weaker at a higher dosage. Membrane fouling is reduced with PAC-UF process. A better trans-membrane pressure (TMP) recovery is received for sodium hypochlorite composite with acid or alkali during chemical cleaning. Source

Liu Y.-W.,Beijing University of Technology | Li X.,Beijing University of Technology | Yang Y.-L.,Beijing University of Technology | Luo W.-X.,Foshan Water Group Co. | And 3 more authors.
Beijing Gongye Daxue Xuebao/Journal of Beijing University of Technology

The combined process of coagulation sedimentation and powdered activated carbon (PAC) addition in immersed ultrafiltration was used to treat Beijiang water for about 70 days continuous running. Effects of different PAC dosages on removal of turbidity, UV254, CODMn, and membrane fouling were investigated, including the effect of retention-time on membrane fouling recovery. Results indicated that PAC could increase organic matters removal effectively, UV254 removal increased to 27.00%, 43.17% and 52.97%, and CODMn removal increased to 6.70%, 20.91% and 22.98% at the dosage of 5, 10 and 20 mg/L, however, the function decrease gradually during 24 h after dosing. PAC addition have an effect on mitigating membrane fouling at the same time. It could meet the demand of economics and effluent quality at the dosage of 5-10 mg/L. When cleaning the fouled membrane with NaClO, the membrane flux could recover at the retention time of 4-6 h. Source

Ding A.,Harbin Institute of Technology | Liang H.,Harbin Institute of Technology | Guo W.,Foshan Water Group Co. | Ye T.,Foshan Water Group Co. | And 3 more authors.
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology

To enhance the quality of wastewater treatment plant's (CASS process) effluent in Foshan to satisfy the water reuse standards, the impact of reflux ratios and reflux modes on nitrogen and phosphorus removal performance of a pilot scale of intermittent A/O-MBR fed with municipal wastewater was studied in this paper. The results showed that the reflux ratios and reflux modes had no remarkable influence on removal of CODCr and NH4 +-N, and the concentrations of CODCr and NH4 +-N in the effluent both reached the primary standard A of (GB18918-2002). The reflux ratios and reflux modes had significant influence on removal of TN and TP. The removal efficiencies of TN and TP were poor with a continuous reflux and a larger reflux ratio (350%); When the reflux ratio was 130%, the continuous mode was propitious to TN removal, and the removal efficiency could reach (48.00±10.05)%, what's more, the concentration of TN in the effluent reached the primary standard A, while the intermittent mode was also propitious to TP removal, the removal efficiency could reach (78.27±23.41)%, and the concentration of TP in the effluent reached the primary standard B. Source

Du X.,Harbin Institute of Technology | Liang H.,Urban Water Engineering | Qu F.,Harbin Institute of Technology | Huang Y.,Foshan Water Group Co. | And 2 more authors.
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology

An integrated approach of potassium permanganate composites and polymeric ferric sulfate was used to strongthen the effect on the removal of simulated thallium and antimony combined pollution in surface water. Jar tests and micro-travelling experimentation platform tests were used to optimize the operation conditions, then the main factor for removing thallium (Tl) and antimony (Sb) combined pollutants was discussed. The results show that the initial water containing 0.21-0.35 μg·L-1 (2-3 times) thallium (Tl) and 15-20 μg·L-1 (3-4 times) antimony (Sb) can be treated to satisfy the Chinese drinking water quality standard, simultaneously the corresponding operation condition are as follows: the pH value of raw water should be adjust to 5.7-6.3, the dose of PPC was higher than 3 mg·L-1 and a dosage of PFS was higher than 40 mg·L-1. And furthermore, the dosage of potassium permanganate composites (PPC) was the key factor for thallium (Tl) removal, while the dosage of polymeric ferric sulfate (PFS) and pH of raw water were the key factors for antimony (Sb) removal. Source

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