Menstrual cycle disorders are often become a problem for couples of childbearing age who use contraceptives, especially hormonal contraceptives namely injectable contraceptives.The problem itself can be in the form of a long cycle or more than 35 days (oligomenorrhea), a short menstrual cycle of less than 21 days (polymenorrhea) and a menstrual absence in 3 months in a row (amenorrhea). This study aims to determine the relationship between the use of contraceptives and menstrual cycle disorders in couples of childbearing age at Puskesmas Piyungan Sub-district, Bantul Yogyakarta in the year of 2021. This study is quantitative analytical study with Cross Sectional approach which was conducted retrospectively. The sampling technique used was Proportional Random Sampling with the total sample of 96 respondents. The analysis used were univariate and bivariate analysis. The results showed that from 58 respondents who used hormonal contraception, 44 respondents (75,9%) experienced abnormal menstrual cycle. Meanwhile, 38 respondents who used non-hormonal contraception at least experienced an abnormal menstrual cycle as many as 6 respondents (15,8%). The Chi-Square test showed that there was a significant relationship between the use of contraceptives and menstrual cycle disorders in couples of childbearing age, namely p = 0,000 < α = 0,05 with OR value of 16,762. There is a significant relationship between the use of contraceptives and menstrual cycle disorders at Puskesmas Piyungan Sub-district, Bantul Yogyakarta.

In the seaweed processing industry to obtain quality products that are free of microorganisms, high concentrations of chlorine are used in the cooking process. Thus the wastewater from the cooking process still contains high concentrations of residual chlorine, where the wastewater when disposed of into the aquatic environment can cause pollution and damage of environmental. The aim of the research is the reduction of high concentrations of residual chlorine in seaweed wastewater using a combination process of aeration, heating and addition of Hypochlorous acid (HCl). The experiment was conducted by adding wastewater from the seaweed cooking process with HCl (1; 2; 3; and 4% v/v), aeration flowrate (1; 1.5; 2; and 2.5 Ls/minute) and heating temperature (35; 40; 45; and 50°C). Residual chlorine concentration was measured using the iodometric method. The experimental results showed that the maximum reduction of residual chlorine by 96.3% was obtained by adding HCl by 3%, aeration flowrate of 2.5 L/minute and heating temperature of 45°C.