The objective of this research is to design a biofilter with Caesalpinia spinosa mucilage to reduce the turbidity of the surface waters of the Pollo River, province of Otuzco, La Libertad region. Studies were analyzed where data related to the parameter of turbidity, color, pH, suspended solids, BOD and COD were extracted from water from different rivers, which were treated with natural coagulants from different plant species. In the proposed methodology, the economic and sustainable aspects were considered, the total cost and the viability of its use, the installation of the biofilter, the training for its domestic use, and finally the quantity and quality obtained from treated water. As a result, a viable and economical 3D biofilter design was created, consisting of a main treatment tank with a DC motor, a treated water reserve tank and filter meshes. Concluding with the investigation, the physicochemical parameters of the Pollo river micro-basin were diagnosed and a biofilter design with natural coagulant was created to treat the existing problem.

The general objective of this research is to determine the relationship between corporate social responsibility and job satisfaction in the marketing company of CALZADOS MARISOL S.A.C. in the city of Trujillo, 2022. It had a descriptive and correlational methodology, as validated instruments, a questionnaire was used, for data analysis the Central Tendency, Dispersion and Shape Measures were used. In addition, it was carried out with Excel and SPSS V.27 for data processing. The sample is 38 collaborators. The main result was obtained in the analysis of the Pearson correlation coefficient of Corporate Social Responsibility and Job Satisfaction takes a value of 0.716, so there is a direct and determining relationship between the variables analyzed, by a 99% significant test. trusted. And it is concluded that it is advisable to strengthen CSR in the company since from what has been studied it is proven that it will bring future joys for the company. Likewise, the economic references such as bonuses, incentives, gratuities, as well as the faithful fulfillment of the payments on the dates stipulated in their contracts; directly infers the job satisfaction of the company's employees; as long as it does not affect the lasting profitability of the organization over time.