The problem faced by the tofu industry is waste management. So, it is necessary to do so that tofu waste does not pollute the environment by managing waste and emissions, efficient consumption of energy, materials, andwater. One way to identify environmental pollution is by Life Cycle Assessment. This study uses the Life Cycle Assessment (LCA) method. The LCA flow in this study is to determine goals and scopes, create inventory data, make grouping impacts and how much impact they generate, as well as interpreting to provide improvements. The functional unit in this study is 1 kg of tofu which is produced in 1 day. The results of this study were divided into five impact categories, namely, climate change, the most important being 2195 kg CO2, human toxicity potential at 2187 kg 1,4-Dikchloro benzene, eutrophication at 0.935 kg PO4, photo oxidant at 0.797 kg C2H4, and acidification at 15,915 kg. SO2. The recommended improvement alternative is to make efforts to use water efficiently during the tofu production process, including the need to clean the scale in the steam boiler to increase the volume of steam produced, so that the use of water and energy is more efficient.

Kriteria sarana sanitasi dasar rumah tinggal sesuai dengan Surat Keputusan Kementrian Kesehatan Republik Indonesia Nomor 829/Menkes/SK/VII/1999 tentang persyaratan kesehatan perumahan meliputi sarana air bersih, sarana pembuangan kotoran, saluran pembuangan air limbah, dan sarana tempat pembuangan sampah. Tujuan penelitian ini adalah untuk mengetahui hubungan bagaimana pengaruh variabel umur, pendidikan, pekerjaan, dan jenis kelamin seseorang terhadap kualitas sarana sanitasi dasar rumah tinggal yang dimiliki warga di kelurahan Sewu, kecamatan Jebres, kota Surakarta . Penelitian ini merupakan penelitian deskriptif kuantitatif dengan pendekatan cross-sectional. Sumber data dalam penelitian ini adalah data primer dan sekunder. Populasi 2.277 Kepala Keluarga (KK), dan sampel diambil secara random probability sampling dengan menggunakan rumus Slovin, diperoleh sampel sebanyak 341 Kepala Keluarga (KK). Analisis data dengan chi-square, dan uji regresi linier berganda. Kesimpulan penelitian ini adalah variabel pendidikan (p 0,014 < 0,05), pekerjaan (p 0,000 < 0,05), penghasilan (p 0,000 < 0,05), dan jenis kelamin (p 0,013 < 0,05) memiliki pengaruh yang signifikan terhadap kualitas sarana sanitasi dasar rumah tinggal yang dimiliki responden, sedangkan variabel umur tidak berpengaruh secara signifikan (p 0,105 > 0,05). Berdasarkan pengujian variabel-variabel penelitian dengan model regresi linier berganda diketahui bahwa umur, pendidikan, pekerjaan, penghasilan dan jenis kelamin responden memberikan pengaruh secara serentak atau simultan terhadap kualitas sarana sanitasi rumah tinggal yang dimiliki responden (p 0,000 < 0,05).    The criteria for basic residential sanitation facilities are in accordance with the Decree of the Ministry of Health of the Republic of Indonesia Number 829 / Menkes / SK / VII / 1999 concerning housing health requirements including clean water facilities, sewage disposal facilities, sewage drains, and garbage disposal facilities. The purpose of this study was to determine the relationship between age, education, occupation and gender variables on the quality of basic residential sanitation facilities owned by residents in Sewu Village, Jebres District, Surakarta City. This research was  a descriptive quantitative study with a cross-sectional approach. Sources of data in this study were  primary and secondary data. Population of 2,277 heads of household (KK), and samples taken by random probability sampling using the Slovin formula, obtained a sample of 341 heads of households (KK). Data analysis using chi-square, and multiple linear regression test. The conclusion of this study is that the variables of education  (p 0,014<0.05), occupation  (p 0,000<0.05), income  (p 0,000<0.05), and gender  (p 0,013<0.05) have a significant effect on the quality of basic residential sanitation facilities owned by the respondent, while the variable age does not have a significant effect (p 0,105>0.05). . Based on the testing of research variables with multiple linear regression models, it is known that the age, education, occupation, income and gender of the respondent have a simultaneous or simultaneous influence on the quality of residential sanitation facilities owned by the respondent (p 0,000<0.05).

The batik home industry of Kampung Laweyan, Surakarta City did not make efforts to prevent environmental pollution from the wastewater produced. Waste water is discharged into the Jenes river, so that the river becomes polluted and contributes to the pollution of the Bengawan Solo River Basin. The study was conducted at the Environmental Laboratory, Environmental Engineering Study Program, Faculty of Engineering, Surakarta Christian University by conducting the coagulation process of flocculation with the jart test. This study uses variations and dosages of the type of FeSO4 and PAC coagulants with levels of 5% each for 100 ml / sec waste discharge. The results of the research are that before the waste is processed by the coagulation process, the value of BOD = 660.28 mg / l and COD = 1600. After the coagulation process, the efficiency of each type of coagulant is with FeSO4, BOD = 85.63% and COD = 82.67 %. With PAC coagulant, BOD = 90.21%, COD = 88.97%. This shows that the ability of PAC to reduce pollutant parameters is greater than ferrous sulfate.

Christian University of Technology Solo produces quite a large amount of waste, which in 1 day produces around 7 kg of waste resulting from the activities of 2 canteen units, dry leaf waste on the UKTS campus yard, and waste from the activities of students, staff and lecturers at Solo Christian University of Technology. This method uses biopore infiltration holes located in the yard of Solo Christian University of Technology, where organic waste is divided into two groups, namely kitchen waste and dry leaves. Kitchen waste is mixed into one consisting of leftover rice, vegetables, chicken bones, fried leftovers and dry leaves which are cut and crushed into leaf powder. The waste is put in the biopori infiltration hole and given water to keep it moist. Humidity was measured every week and water was added. The results of this study were that from 5 biopori infiltration holes with 4.88 kg of dry leaf waste, 1.48 kg of compost was produced with a decomposition process time of 57 days, while the 6th biopori infiltration hole had the amount of waste. a 6.5 kg kitchen produces 1.3 kg of compost with a decomposition time of 30 days

Surfactants are compounds that make up deterjents, which if deterjent is dumped into the river it will cause pollution. In the province of West Java, river water and receiving water bodies, based on the results of the study, showed moderate to severe pollution by wastewater containing deterjents. The results showed that the PAC coagulant and alum has a small effect on the decrease in surfactant and floc velocity settling, where the decrease in surfactant in the rainy season for PAC coagulant is 49.51% and alum coagulant 40.73%. While in the dry season the decrease in surfactant with PAC coagulant 41.06% and alum coagulant 31.10%. Then the floc velocity settling was measured to explain the correlation of surfactant decline, and the results obtained for the rainy season floc velocity settling with PAC coagulant was 0.80 cm / minute and alum was 0.27 cm / minute. Whereas in the dry season with the PAC coagulant the floc velocity settling was 0.91 cm / minute and the alum coagulant was 0.31 cm / minute. The results of quantitative regression analysis with the SPSS statistical test showed that the H0 hypothesis was accepted, that the coagulant had no effect on surfactant reduction and floc velocity settling.