Nastiti Siswi Indrasti

STRATEGI PENGELOLAAN SUNGAI CIBANTEN PROVINSI BANTEN BERDASARKAN ANALISIS DAYA TAMPUNG BEBAN PENCEMARAN AIR DAN KAPASITAS ASIMILASI

Cibanten river is one of the most potential to be developed as a source of raw water. Crucial issues at Cibanten river is the increasing load of water pollution as indicated by parameter BOD, COD and TSS. This study aimed to estimate the amount of Total Maximum Daily Load (TMDL) in Cibanten river, analyze the quality Status of the Cibanten river water, analyze the capacity of assimilation, and determine management strategy of Cibanten river of Banten Province. TMDL of BOD were determined by modeling Qual2KW and the results were compared with the second class water quality standards to regulation No. 82/2001. Management strategy of Cibanten river determined by analysis of the results of an expert survey method with AHP (Analytical Hierarchy Process). Quality Status of the Cibanten river water with pollution index was light raiment and storet method of Raw Water Quality class II belong was heavy raiment. Results of the simulation calculation of TMDL, the total load of pollution in the Cibanten BOD was730 tons/month while the TMDL of BOD was 146.801 tons/month. Results of the analysis of assimilation capacity COD was 24208 tons/month. Results of the analysis methods of survey expert with AHP (Analytical Hierarchy Process) is monitoring and surveillance as an alternative management strategies with the highest priority of the Cibanten river (agregate value 0.202)and following up the monitoring results.

SINTESIS NANOSILIKA DARI ABU KETEL INDUSTRI GULA DENGAN METODE ULTRASONIKASI DAN PENAMBAHAN SURFAKTAN

Boiler ash from sugar industry contains silica compounds which could be synthesized into nanosilica by ultrasonication method. The addition of surfactants in this synthesis method can affect the characteristics of nanosilica. This study aims to synthesize nanosilica with ultrasonication method and determine the effect of surfactants on characteristics of nanosilica generated. This research was divided into three stages: (1) boiler ash preparation to furnace ash, (2) silica extraction from furnace ash, and (3) synthesis of nanosilica using ultrasonication method with surfactant addition: PEG 6000 1:5, CMC 2.5% (b/b), CMC 5% (b/b), CMC 10% (b/b), and Tween 80 3% (b/v). Silica content in boiler ash and furnace ash was 49.69% and 78.75%, respectively. The nanosilics produced using the ultrasonication method had the uniform size (PDI) of 0.638, and with the addition of surfactant might increase the uniformity of the particle (PDI) to 0.045 and 0.047 on the usage of CMC 5 and 2.5%. The addition of surfactant also increased the crystallinity degree from 76.96% at no surfactant to 84.04% with 10% CMC surfactant added. The crystalline size of the silica nanoparticles also became smaller with the addition of 10% CMC of 37.69 nm from 41.40 nm crystal size without the addition of surfactant. The addition of an enlarged CMC concentration would increase the degree of crystallinity and decrease the crystal size of the nanosilica particles. Keywords : boiler ash, nanosilica, ultrasonication, surfactant, degree of crystallinity

Strategi Implementasi Produksi Bersih untuk Meningkatkan Kinerja Industri Gondorukem (Studi Kasus Nagreg Jawa Barat)

This study aimed to audit environmental performance in gondorukem (resina colophonium) industry, analyze the main problem of waste and formulate the direction of industry development by cleaner production method. Data collection was conducted by field observation, interview and expert surveys. The analysis method used in this research is cleaner production audit which consist quick scan on stages of production process and formulation the cleaner production option, continued prioritization with Analytic Hierarchy Process. This study was case study take place in nagreg west java. Results of the analysis showed that scheduling sap delivery to be a priority based alternative with the largest value analysis id 0,216 compared with other alternatives.