Novel helical or coiled flocculator for turbidity reduction in drinking water treatment: a performance study

Helical or spiral coiled flocculator have not been applied in drinking water treatment yet in Indonesia. There were only a few articles discussed it with different themes like hydrodynamic, floc characteristic, and performance. This study was done to know the efficiency (performance) of helical flocculator with parameters velocity gradient, pipe and helical diameter, flowrate, detention time, coagulant dose. The study was divided into two steps: Jar test to determine the optimum dose of coagulant and flocculation experiments to evaluate the helical flocculator efficiency. Efficiencies were in the range of medium to high. On flowrate 13 ml/second was obtained good results for two pipe sizes but different in helical diameters. In 0.5 inch pipe with 0.8 m helical diameter the turbidity reduction efficiencies were 72.4% and 73.9% and sediment volume were 18.3 ml and 20.0 ml. In 0.625 inch pipe with 0.4 m helical diameter the turbidity reduction efficiencies were 76.7% and 78.5% and sediment volume were 14.3 ml and 19.7 ml. The optimum velocity gradient about 64.9–69.6 persecond and detention time about 438–649 seconds. The results showed that helical flocculator was effective for floc formation. Flowrate, pipe diameter, helical diameter were three key parameters to perform helical flocculator.

Optimization of water treatment process performance of Duren Seribu Water Treatment Plant in Depok City: water quality and design parameters

Duren Seribu Water Treatment Plant (WTP) plays a role in fulfilling water needs due to the increase in population growth. This study aims to evaluate the performance of the WTP and the potential for capacity uprating from the aspect of conformity to water quality standards, removal efficiency, and design parameters. Data collection was carried out by observation, measurement, and sampling. The result showed that raw water quality complies with the quality standards and is influenced by seasons. Meanwhile, the quality of drinking water produced for the parameters of pH, turbidity, TDS, organic matter, iron, and total coliform has complied with the quality standards. The efficiency removal of turbidity, TDS, organic matter, and iron occurred in conventional processing units were 94.6%, 70.5%, and 90.9%, and the total coliform removal efficiency was 1.8-log (67.05%). Based on the assessment of the design criteria, there are design parameters of the unit that require technical improvement such as detention time of flocculation unit, velocity and detention time in tube settler sedimentation unit, and the capacity of Duren Seribu WTP could be increased by 10% or up to 110 liters/second.

Wastewater treatment for tofu home industries in Semanan, West Jakarta using electrocoagulation method with electrode al-stainless steel

Tofu wastewater is dangerous for the aquatic environment because it contains high BOD, COD, and TSS, which will damage life in the river. Tofu home industries in Semanan have not used a proper wastewater treatment system, and this study was conducted to test the electrocoagulation system to reduce the levels of BOD, COD, and TSS. According to several studies, the electrocoagulation system can reduce BOD, COD, and TSS. It is hoped that this electrocoagulation system can solve environmental problems caused by tofu wastewater. From the research that has been done, namely with the stirring variable at a speed of 150 RPM and at a detention time of 10 minutes with a discharge of 0.6 liter/minute, the percentage of COD removal is 36%, the percentage of BOD removal is 27%, and the percentage of TSS removal is 51%. Then on the stirring variable at a speed of 100 RPM and at a detention time of 10 minutes with a discharge of 0.6 liter/minute, the percentage of COD removal is 32%, the percentage of BOD removal is 15%, and the percentage of TSS removal is 58%.

Study of tofu wastewater treatment using anaerobic baffled reactor: laboratory scale

One of the foods favorites by Indonesian people is tofu. In the process of making tofu, it produces wastewater. The tofu wastewater must be treated first to reduce environmental pollution. To treat the liquid waste, it is using biological treatment by an anaerobic baffled reactor with bio-ball. The purpose of this study was to determine the optimum time at 75% tofu wastewater concentration. The detention time used in this study was 12 hours, 24 hours, 36 hours and 48 hours. Seeding takes time about 45 days, with the obtained VSS was 5550 mg/L. Furthermore, acclimatization in the reactor takes about 30 days, with an efficiency of removing COD of 86.3%. The results obtained that at 12 hours of detention, there is a COD allowance of 79.8%, 24 hours of detention time there is a COD allowance of 85.4%, 36 hours of detention time 86.3%, and 48 hours of detention time 88.4 %. It shows that the optimum detention time in this anaerobic reactor is 48 hours. However, the COD level was 765.3 mg/L is still slightly above the quality standard according to the Minister of Environment Regulation No.5 2014, which is the maximum COD level of 300 mg/L.

Evaluation of Magnetic Stirring and Aeration on Electrocoagulation Performance in Actual Industrial Treatment

Agitation was a significant factor in achieving the high performance of the electrocoagulation (EC) system. Three EC systems with four parellal monopolar Al electrodes were established to clarify the influence of agitation methods on pollutants removal efficiency; magnetic stirring, continuous aeration, and combination of magnetic stirring and aeration. The aim of this work was to maximize industrial wastewater treatment in a short detention time and to understand the mechanisms that occurred in different EC systems. The coolant wastewater from the aluminum product industry was represented as industrial wastewater. The hybrid stirring-aeration EC system obtained a lower COD removal compared to the stirring EC system and the aeration EC system. Although aeration can cause an increase in COD removal due to complete circulation and effective coagulant formation of Fe (OH), however, the combination of aeration and stirring negatively affected the performance of CE. The possible reason was that the excessive agitation led to a rapid mixing of the solution, and then the coagulants and pollutants obtained insufficient time to form flocs to precipitate. The best EC performance was observed in the aeration EC system, followed by the stirring EC system, control system (without agitations), and the stirring aeration EC system, respectively, in the short detention time of 15 min. Furthermore, all EC systems could achieve an excellent COD removal of 91% when the detention time was sufficient (eg, 45 min for the stirring aeration EC system). Furthermore, the decreasing number of electrodes affected the COD removal efficiency, whereas the NaCl additive was insignificantly affected.

PENGARUH VARIASI MEDIA DAN JUMLAH TUMBUHAN TYPHA LATIFOLIA TERHADAP PENURUNAN KADAR BOD DAN COD PADA LIMBAH CAIR INDUSTRI TAHU DI SIDOARJO

Sidoarjo Regency is one of the supporting districts of East Java province. Sidoarjo Regency is experiencing rapid progress because of the development and potential in trade and industry. One of the industries often found in Sidoarjo Regency is tofu factory. The rapid number of tofu craftsmen industry has caused an increase in the volume of liquid waste which also flows into water bodies. The purpose of this study was to determine the reduction in BOD and COD levels for the tofu factory wastewater treatment in the Sepande area, Sidoarjo Regency using a contructed wetland with Typha latifolia as the remediator. The research stage will be carried out using a laboratory scale using acclimatization as the adaptation stage of Typha latifolia and a crontructed wetland reactor as phytoremediation processing. Based on the results and discussion, it can be concluded that there was a decrease in BOD and COD levels in the tofu industrial wastewater in Sidoarjo using the Constructed Wetland system. The percentage reduction in BOD content was greatest in soil media with 3 stems of Typha latifolia plants and a detention time of 4 days of 72%. While the largest percentage reduction in COD levels was in soil media with 2 stems of Typha latifolia plants and 4 days of detention time of 84%.

On-Site Total Phosphorus Removal From Wastewater

Eutrophication is attributed to high phosphorus concentrations in our ecosystem, modifying water and habitat quality. As an industry-academia collaboration program, this thesis assists the development of Virtual Engineers’ (VE) technology of a cost-effective, efficient, and affordable on-site Total Phosphorus (TP) removal unit. By investigating the chemical adsorption of a clay-zeolite media, the objective was to demonstrate TP removal capacity; primarily focusing on pellet media composition and formation, influent concentration, contact time to overall removal efficiency. All stages of optimization analyses were conducted in a scaled-down testing unit based on a ¾ inch pellet diameter construction, for a modest 45 minute detention time, and achieved an optimized removal of approximately 45%. The final pellet selected was the non-conditioned VE design, at maximum furnace exposure, scaled up to a 1 inch diameter. Results showed that an equilibrium removal of 72% is achieved after a 3 hour contact time; supporting the research of Sun (2010) on the Freundlich Adsorption Isotherm linearization of solute adsorption to equilibrium solvent concentration.

On-Site Total Phosphorus Removal From Wastewater

Eutrophication is attributed to high phosphorus concentrations in our ecosystem, modifying water and habitat quality. As an industry-academia collaboration program, this thesis assists the development of Virtual Engineers’ (VE) technology of a cost-effective, efficient, and affordable on-site Total Phosphorus (TP) removal unit. By investigating the chemical adsorption of a clay-zeolite media, the objective was to demonstrate TP removal capacity; primarily focusing on pellet media composition and formation, influent concentration, contact time to overall removal efficiency. All stages of optimization analyses were conducted in a scaled-down testing unit based on a ¾ inch pellet diameter construction, for a modest 45 minute detention time, and achieved an optimized removal of approximately 45%. The final pellet selected was the non-conditioned VE design, at maximum furnace exposure, scaled up to a 1 inch diameter. Results showed that an equilibrium removal of 72% is achieved after a 3 hour contact time; supporting the research of Sun (2010) on the Freundlich Adsorption Isotherm linearization of solute adsorption to equilibrium solvent concentration.

Modification of the Sedimentation Unit with Continuous Discharges Flow (CDF) as a New Method to Increase Turbidity Removal in Raw Water

This study applies a new method to remove the turbidity of raw water in the sedimentation unit called CDF sedimentation using the working principle of a leaky tank at the bottom of the tank. The test was carried out on a laboratory scale reactor of 240 L/hour for 6 hours consisting of a waterfall coagulation unit for 5 seconds and alum as a coagulant. perforated wall flocculation unit with 30 minutes detention time and 1 hour CDF sedimentation unit. The study was conducted with 4 variations of CDF, namely 0%, 1%, 3%, and 5% with turbidity of 75.25 NTU. The results showed the greater the CDF value, the greater the decrease in turbidity that occurred. The highest level of turbidity removal occurred at 5% CDF value with an efficiency of 91,09%, a correlation value -0,927, and a significance value of 0,00 < 0,05. CDF value gives an influence on Reynolds numbers and Froude numbers in sedimentation units where Reynolds numbers are in the range 65,71-76,75 and Froude numbers 1,96x10-4-2,29x10-4. This shows the Reynolds number and the Froude number will get bigger as the value of the CDF and still matches the design criteria of the laminar. Keywords: The CDF sedimentation, Efficiency, and Turbidity.

Optimization of Coagulation and Flocculation in Concrete Wastewater of Precast Industry

<p><strong>Abstract.</strong> The population increase until the end of 2019 reached 267 million. This is in line with developments that support activities. This is inseparable from the actions of one of the precast concrete companies PT.WB Precast Plant Karawang in supporting development that produces waste in the form of wastewater. The parameter measured as a reference in carrying out processing is the Minister of Health Regulation Number 32 of 2017. This study's method refers to turbidity as a physical parameter, namely 25NTU and hardness total as a chemical parameter, which is 500 mg / l. CaCO3. <strong>Objectives:</strong><strong> </strong>The purpose of this study was to determine the optimization of the use of PAC as a coagulant and flocculant to reduce the turbidity and total hardness and determine the optimum detention time of flocculation.<strong> </strong><strong>Method and results:</strong><strong> </strong>The sampling method in this study is observation. The population in this study is concrete wastewater with parameter values that are not in accordance with the standard.<strong> Conclusion:</strong> By using PAC 10% the optimum doses is 140 ppm, and the optimum detention time of flocculation is 5 minute that can reduce the turbidity from 275 NTU to be 11.615 NTU or 95.7% and can reduce total hardness from 948.75 mg/l CaCO3 to be 491.25 mg/l CaCO3 or 48.2%.</p>