Papers by Author: Gai Mei Guo

Abstract: The paper studied the effect of tide on the removal rate of COD, NH₃-N and TP in the dosing pool in order to provide data to simulate disorderly discharged sewage in tidal rivers. Due to the dilute effect of rivers, the removal rate of COD, NH₃-N and TP at the tidal state was higher than that at no tidal state. At the tidal state, the average removal rate of COD, NH₃-N and TP was 60.8%, 55.7%, 55.6%. At no tidal state, the average removal rate of COD, NH₃-N and TP was 57.5%, 47.5%, 8.6%. At the tidal state, the upper bio-film was exposed to air and the activity of microorganism decreased, and the activity of microorganism was high at middle-level bio-film. Therefore, the utilization of bio-film at the tidal state was lower than that at no tidal state. However, due to the tidal action, rivers entered into the dosing pool and the dilute effect of rivers on the pollutants was obvious.

Abstract: The paper studied the removal rate of COD under the impact of an instantly big flow of wastewater, and restoring capacity of bio-film after the impact in order to provide data to simulate disorderly discharged sewage in tidal rivers. At 2h after rising tide, the concentration of COD in the dosing pool was 187mg/L and the removal rate of COD was 33.2%. The removal rate of COD before the impact was similar to that after the impact, which indicated that bio-film had the adaptive ability. At 2h after ebb tide, the removal rate of COD was 30.7% after the impact in the dosing pool. The removal rate of COD was 32.0% before the impact in the dosing pool. Compared to the removal rate of COD before the impact, the removal rate of COD after the impact slightly decreased and the reason was that multiple enzyme stimulant had the positive effect on restoring capacity of bio-film.

Abstract: The paper studied the effect of water flow pattern on the treatment of disorderly discharged sewage in tidal rivers by bio-film process. The results indicated that biomass was greater under the fluctuation turn flow than under the folding flow around. Under the fluctuation turn flow, the concentration of COD was 168mg/L and the removal rate of COD was 37.1%. Under the folding flow around, the concentration of COD was 187mg/L and the removal rate of COD was 29.4%. The results indicated that the removal rate of COD was higher 7.7% under the fluctuation turn flow than under the folding flow around. The reason was that under the fluctuation turn flow, soft packing fiber was derided by water, and the effective use of surface area was great and microbial growth space was large.

Abstract: The research studied enhanced treatment of sewage from discharging points of rivers by biofilm process dosing with enzyme and the effect of phenol on removal rates of the main pollution indexes, and investigated promotion effect of enzyme (including the laboratory developed compounded enzyme and the foreign composite enzyme) on treatment of sewage by biofilm process. The research results indicated that when initial concentration of phenol was 5mg/L, the removal rates of phenol, COD_Cr and ammonia nitrogen obviously decreased compared to no phenol added to reactor A, B and C, and the negative effect of phenol was smaller on reactor B and C than on reactor A. Moreover, enzyme had good promotion effect on biofilm process during the sewage treatment process.

Abstract: Humic acid and aromatic organic compounds (AOCs) detected generally in source water recently could react with chlorine during drinking water treatment process to generate disinfection by-products (DBPs), such as trihalomethanes (THMs) and haloacetic acids (HAAs). To simulate the real contaminated water, in the samples containing humic acid, 1,3-benzenediol, 1,4-benzenediol, 1,2-benzenediol, phenol and benzoic acid as representative AOCs were added to conduct chlorination test in order to analyze the impacts of some factors on the formation of THMs and HAAs. The research results indicated that THMs concentration increased with pH but HAAs concentration decreased with pH, and chlorine time, temperature and chlorine dosage all had the functional relationships with the formation of THMs and HAAs. These results could provide the valuable information for the effective control of DBPs during drinking water treatment operation.

Abstract: This paper studied treatment of sewage from channel discharge with biological accelerator-biofilm process, and investigated the promoting effect of biological accelerator on biofilm process during the sewage treatment process. Meanwhile, compared the difference between the laboratory developed compounded enzyme and the foreign composite enzyme. The research results indicated that using biofilm process, the composite enzyme-biofilm process and the compounded enzyme-biofilm process for treating sewage, the removal rate of COD_cr was separately 70.5%, 78.4% and 74.0% and that of ammonia nitrogen was separately 38.2%, 48.6% and 45.9%, which accounted for that under the strengthening action of biological accelerator, the treatment effect was remarkable for using biofilm process disposing channel disordered discharge sewage. Furthermore, the promoting effect of the compounded enzyme was equivalent to that of the composite enzyme for biofilm process, and the compounded enzyme could come into use instead of the composite enzyme.