Utilization of Wastewater Treatment Plant Output into Liquid Organic Fertilizer on the Growth of Pak Choi ( Brassica rapa L.)

Abstract

Industrial wastewater generally contains many nutrients and organic materials that can be useful as a source of nutrition for plants. Processing wastewater into LOF can be a solution to manage industrial wastewater produced and can reduce the negative environmental impact of direct discharge into the environment. This study aims to determine the effect and optimal concentration of LOF from WWTP output on pak choi (Brassica rapa L.) plant growth and analyze the quality of LOF content according to SNI in the Minister of Agriculture Regulation Number 70 of 2011. This study used the complete randomized design method with the following treatment combinations: A (control, 100% WWTP output of PT X), B (20% LOF), C (40% LOF), D (60% LOF), E (80% LOF), and F (100% LOF). Each treatment was repeated three times so that 18 test plants were obtained. Observation variables include height, number of leaves, leaf width, and fresh weight of Brassica rapa plants. Data analysis using SPSS one-way analysis of variance (ANOVA) test and continued to DMRT test. The results showed that the provision of LOF from WWTP output of PT X had a significant effect on the growth of Brassica rapa plants in the parameters of plant height in the fourth and fifth weeks, the number of leaves from the second to the fifth week, the leaf width parameter in the fifth week, and the fresh weight parameter. The optimal treatment for the LOF comparison of all parameters is in treatment D (60% LOF). The test results of LOF content contain C-organic 3.61%, nitrogen 1.1%, phosphate 0.385%, potassium 0.485%, and pH 5.27. These values have not met the SNI LOF in the Minister of Agriculture Number 70 Regulation of 2011. There is a need for the addition of organic ingredients that can increase the N, P, and K content in order to increase the POC yields and have a higher impact on plants.

Keywords

• wastewater
• wwtp output
• liquid organic fertilizer (lof)
• brassica rapa l