Study On Estimation Of Emission Capacity About Control Units Around Jiaozhou Bay In Qingdao

With the rapid development of economy and the lasting increasement of population in Qingdao, more and more pollutants have been discharged into Jiaozhou Bay. However, the original concentration control and target total emission control systems are unable to meet the demand of the marine environment management. The implementation of capacity total emission control of pollutants is an important and effective measure to improve marine water quality. The capacity total emission control contains several steps, such as estimation of pollutant fluxes into the sea, calculation of marine environmental capacity and allocated capacity, optimization and allocation of capacity. Among them, the pollutant flux estimation is the base, and the calculation, allocation and optimization of capacity is the key of the research. Aimed at the optimization and allocation of capacity, a forefront and hotspot of this field, the research is carried out based on the study of marine environmental capacity and allocated capacity of Jiaozhou Bay. The allowable emission capacities of main chemical pollutions are calculated according to the principle of multi-target nonlinear programming and the scheme of total emission control is proposed. The main methods and results of research are showed as follows:(1) Based of the data of the nature, resources, society and economic development, as well as the major pollution sources and pollution discharge characters in the research regions, pollution control units (PCUs) are divided based on street or rural-town district were divided. Their discharging pollutant properties were also invetigated. In total 179 PCUs were divided in Qingdao. Among them, the COD discharging value of the Fuxin PCU in Sifang District is the highest and as high as 132 t·a-1, following Zhonghan PCU in Laoshan District, Jiaxing PCU, Xinglong PCU and Hailun PCU in Sifang District, the discharge value of COD respectively is 830 t·a-1, 712 t·a-1, 706 t·a-1and 684 t·a-1. In the source percent run, the percent of the domestic sewage is from 1.7% to 97.5%, and there are 57 PCUs are above 50%, they primarily distribute in the administration region of pollution discharge (ARPD) of Tuandao, Maidao, Haibo River, Licun River and Moshui River. According to the discharge value of NH4-N, the main source is from domestic sewage. The average percent is 57.0%. It is from 2.0%-98.6% in all PCU,and there are 84 PCUs are above 50%.The pollution of TP is the main source from nonpoint, there are 104 PCUs are above 50%.(2)According to multi-objective nonlinear programming, with Jiaozhou Bay, each ARPR capacity, each ARPR allocated capacity and each PCU emission capacity as the objective function, with constrains economic growth, population growth, pollutant emission intensity, environmental investment etc. as constrains, the capacity allocation model was setting and each PCU allowable emission capacity (AEC) was caculated. The caculation results showed that, in the Tuandao ARPD, the Dengzhou PCU has the most AEC of COD. It is is 361 t·a-1 takes about 27% of the Tuandao PCU. In the Haibo River ARPR, the Fuxin PCU has the most AEC of COD , and is 1321 t·a-1. In the Licun River ARPD, ,the Zhonghan PCU has the most AEC of COD. It is 830t·a-1 and takes about 32% of the total ARPD..In the Lousshan ARPD, of the Loushan PCU has the most AEC of COD. It is 512t·a-1 and takes about 26% of the total ARPD, In the Moshui River ARPD, the Tongji PCU has the most AEC of COD, is 174t·a-1, and takes about 30% of the ARPD. In the Dagu River ARPD, the PCU Lancun have the most AEC of COD. It is about 486t·a-1 and takes about 11% of the total ARPD. In the Yang River ARPD, the Hongshiya PCU have the most AECof COD, It is about 516t·a-1. In the Lianwan River ARPD, the Xin'an PCU have the most AEC of COD and it is about 550t·a-1.(3) The total emission control scheme based on PCUs around Jiaozhou Bay was proposed. About 79% of the units should reduce their discharge of COD under GradeⅠof the National Seawater Quality Standards (NSQS), the average reducing grate is 44.8%, primarily in the Moshui River, Dagu River, Haibo River ARPD .About 21% of the PCUs also have remain allowable emission capacity of COD,, the average remaination is 69.8%, primarily in the Tuandao and Lianwan River ARPD About 77% of PCUs should reduce their discharge of NH4-N under GradeⅠof the NSQS, the average reducingrate was 45.6%, primarily in the Moshui River, Dagu River, Haibo River ARPD; About 23% of PCUs also have remain allowable emission capacity of NH4-N, the average remaination is 77.4%, primarily in the Tuandao and Lianwan River ARPD.According to the AECs and current pollutant discharging characteristics of PCUs around Jiaozhou Bay, a series of pollution control measures are proposed, involved in speeding up the construction of the sewage treatment works and pipeline, raising the standard of factory sewage discharge and developing the ecological agriculture, fertilizing in science and so on.The research results can not only provide the necessary technical support for Jiaozhou Bay about pollutants emission, but also can provides the scientific basis for smooth implementation of the strategy of Jiaozhou Bay marine ecological environment protection, and improving Qingdao social economic and sustainable development .