ACCESE2021 was successfully taken place on May 28-30,2021 in Qingdao, China! ​

ACCESE2021 was successfully taken place on May 28-30,2021 in Qingdao, China!   

【Keynote Speechs】

Prof. Jin Li

 Qingdao University,China

Title:Novel Technology for nitrogen removal from saline wastewater

Abstract:Saline wastewater containing ammonia nitrogen emissions increased day by day, which added tremendous pressure on the environment. It was hard to treat saline wastewater by traditional biochemical nitrogen removal processes. Anammox process, as a cost-effective and environment-friendly nitrogen removal approach, has shown an overwhelmingly potential advantage in treating wastewater with high salinity concentration compared to other conventional nitrogen processes. In this paper, anammox process was used to study the nitrogen removal of wastewater containing seawater, and achieved some results:

  The adaptation of freshwater anammox bacteria to seawater. The results showed that anammox bacteria could remain active and maintain high nitrogen removal efficiency in any proportion of seawater through acclimation. When seawater proportion was not more than 40%, the seawater almost had no effect on the stability and the nitrogen removal efficiency of the reactor, besides, the activity of ANAMMOX bacteria was enhanced. The maximum specific activity of ANAMMOX bacteria, achieving in the reactor with 30% seawater, was 21.3% up compared with reactor with 10% seawater. When seawater proportion was more than 40%, the nitrogen efficiency of reactor began to decay. However, with sufficient time to adapt, the efficiency would recover. During this period, the reaction of the reactor to seawater could be divided into three phases: sensitive period, interim stable period and recovery period.

  The recovery capability of anammox bacteria that suffered inhibition of high salt environment contained 100% seawater concentration. The results showed that the nitrogen removal performance of anammox reactor suffered inhibition of high salinity concentration would enter a period of stable nitrogen removal efficiency again after an interim stable period and a recovery period, and the nitrogen removal rate (NRR) could be 0.52kg N/(m3·d), which were similar to that containing 10% seawater. The modified Logistic model and modified Gompertz model were revised and its’ suitability were improved. The re-modified Logistic model was suggested to use to simulate the NRR recovery process of anammox reactor that suffered inhibition of 100% seawater concentration. The doubling time of NRR was estimated at 11.359d by establishing the prediction formula for the recovery time of NRR.

   Effects of nitrite on anammox bacteria at salt environment contained 100% seawater concentration. The results showed that anammox process began to be inhibited when the influent nitrite concentration was 170mg/L, and the ammonia nitrogen removal efficiency decreased 8.41%. The fitting of modified Logistic model showed that influent nitrite less than 151.49mg/L would increase the nitrogen removal rate while influent nitrite higher than 170mg/L would inhibit the nitrogen removal rate. The model of Luong suited to fit the inhibition kinetics with higher nitrite concentration which affected nitrogen removal efficiency. The maximum substrate removal rate (NRRmax) obtained by Luong model was 0.53 kg N/(m3·d), and the half-saturation constant (KS) was 0.10 mg/L. The maximum allowable effluent nitrite concentration above which cells do not grow (Sm) was predicted to be 338.22 mg/L and the correlation (n) was 0.97801. When anammox process was used to treat wastewater containing 100% seawater, it was suggested that the effluent of nitrite concentration should be lower than 338.22 mg/L.

                                                Prof. MOHAMMAD RUSSEL

                                         Dalian University of TechnologyChina

Title:Microwave sensor measurement system to monitoring the current smart city environmental challenges

Abstract:Air, water and soil pollution are the key concern for the smart city development. As we know smart city are developing to attract more people to come and take part to the central government revenue. By 2050, there will be approximately 2.5 billion new urban residents. For the time being population are growing and basic infrastructure demands are urges to make it up to the standard to mitigate sustainable smart city development. The current challenges in smart city development are the monitoring the environmental pollution. So that, there is an often threaten to the smart city environment. Therefore, it’s an urgent need to thinking something smart solution which could mitigate the current smart city environmental monitoring challenges. Microwave sensor could be a smart choice to monitoring the current environmental challenges. Here we have developed microwave transmission line and open-ended coaxial sensor to monitoring the crude oil contamination from the seabeach sand and algal biomass from the surface water. These novel approaches were applied to analyse the polarization mechanisms to better understand the electromagnetic characteristics of beach-sand and surface water sample. The probe sensitivity is 14.6 mg/g for water and 80 mg/g for meta-cresol of crude oil contaminate. On the other hand, the coaxial probe sensor was used to measure the dielectric constant of algae under different nutrition, temperature and solvent. The measured dielectric constant and temperature of algae show a trend of decreasing the imaginary part of dielectric constant and increasing the real part of dielectric constant with the increase of temperature. The relationship between the measured dielectric constant of algae and the solubility of algae, the results show that r2 in the imaginary part of the dielectric constant of freshwater algae can reach 0.9999, 0.9994, 0.9997, and r2 in the imaginary part of the dielectric constant of seawater algae can reach 0.9979, 0.9978, 0.9969. And both of the microwave sensor probe has broad band frequency (30kHz -3GHz ) coverage.

【Oral Speechs】

【Conference Ended 】