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BACKGROUND: Natural coagulants are used as much as possible to reduce synthetic materials that produce side effects in their use. The use of natural coagulants will be cheaper than synthetic coagulants, which are commonly used for water purification. Chinese tea seeds (Cassia angustifolia) can reduce turbidity, because they contain complex carbohydrates and sugars that can bind particles in the water. Cassia angustifolia plant may also be used as a coagulation agent for conventional drinking water treatment. AIM: This study aims to determine the optimization of coagulants from Chinese teak seed powder (Cassia angustifolia as a natural coagulant in reducing the turbidity of wells water. METHODS: This study used Cassia angustifolia coagulant for the water treatment coagulation process with turbidity and pH parameters. This was a quasi-experimental study. The Completely Randomized Design (RAL) method was used. The study location was carried out at the Laboratory of the Environmental Health Department, Poltekkes, Ministry of Health, Banda Aceh. The doses used were 10 ppm, 30 ppm, 50 ppm, 70 ppm, and 100 ppm. The data were analyzed by one-way analysis of variance (ANOVA). RESULTS: There is a difference in turbidity reduction in dug healthy water when Cassia angustifolia is added at doses of 10 ppm, 30 ppm, 50 ppm, 70 ppm, or 100 ppm. CONCLUSION: Cassia angustifolia coagulant can be used at low turbidity levels with low doses, but it is necessary to investigate the active compound content and its biocoagulant properties.

BACKGROUND: Darul Imarah District is one of the largest sub-districts in Aceh Besar, which is very dense and faces a waste problem. The increase in population in the Darul Imarah sub-district has resulted in waste generation. AIM: analyzing the generation, composition of household waste and its potential use in Darul Imarah subdistrict, Aceh Besar District, Aceh Province METHODS: This study used a cross-sectional study design by conducting an initial survey on the generationvolume and composition of waste in each house selected as a sample and continued with an experimental study. The research object is solid wastegarbage generated from daily activities in the selected sample group households in the Darul Imarah sub-district in the form of primary data from sampling, with a random sampling technique. The number of samples of 100 houses with the respondent's target is housewives. Data analysis was carried out using the T-Test difference test to compare the value before being given knowledge about household waste management after being given knowledge. RESULTS: The study results show differences in the generation and composition of waste before and after being given knowledge about household waste management in Darul Imarah District, Kab. Aceh Besar with a significant (sig.) Of 0.000 (0.05). The total waste produced before being given knowledge about waste management was 164.6 kg. The composition of the waste consists of plastic waste (22.9 kg), wet waste (62.5 kg), dry waste (37.4 kg), and glass waste (41.8 kg). After being given knowledge about waste management, there was a reduction in the total waste produced, namely 131.8 kg. A significant reduction in the amount of waste in the volume of plastic waste (7.8 kg), wet waste (48.0 kg), dry waste (37.3 kg), and glass waste (38.8 kg). There is a difference in the volume of plastic waste in plastic waste after being given knowledge about household waste management, with the difference between the average before and after is 0.1530 and the difference is between 0.1045 - 0.2015 (95% Ci). In wet waste, there is a difference in the volume of wet waste after being given knowledge about household waste management with the difference between the before and after averages of 0.1450 and the difference between the differences is between 0.0784 - 0.2116 (95% Ci). In dry waste, there is no difference in the volume of dry waste after being given knowledge about household waste management with an average difference before and after of 0.0020, and the difference is between -, 0008 - 0.0048 (95% Ci). There is a difference in the volume of glass waste in glass waste after being given knowledge about household waste management with the difference between the before and after an average of 0.0310 and the difference between the differences between 0.0170 - 0.0450 (95% Ci). CONCLUSION: There are differences in the generation and composition of waste before and after being given knowledge about household waste management in Darul Imarah District, Kab. Aceh Besar with a significant (sig.) of 0.000 (0.05).