Seiring laju perkembangan penduduk di Indonesia yang semakin meningkat tiap tahunnya, meningkat pula jumlah kebutuhan air bersih yang digunakan mengakibatkan volume air limbah yang dihasilkan cukup melimpah terutama di perkotaan salah satunya adalah limbah domestik. Limbah domestik mengandung bahan organik dan anorganik maupun gas yang terkandung dalam limbah cair rumah tangga dapat mencemari lingkungan serta menyebabkan berbagai penyakit. Limbah cair yang dihasilkan biasanya memiliki nilai konsentrasi Biochemical Oxygen Demand  (BOD), Chemical Oxygen Demand  (COD), dan Total Suspended Solids (TSS) yang cukup tinggi. Dengan adanya permasalahan yang terjadi, maka salah satu solusi upaya untuk menyelesaikan permasalahan pencemaran limbah domestik adalah kombinasi floating wetland menggunakan tanaman eceng gondok dilanjutkan sistem lahan basah (Constructed Wetland) menggunakan tanaman bambu air dan melati air untuk menurunkan konsentrasi BOD5,COD dan TSS. Tujuan dari penelitian ini adalah untuk menurunkan konsentrasi BOD5, COD dan TSS pada limbah domestik. Parameter awal pada limbah domestik kadar BOD5 rata-rata sebesar 210,67 mg/L, COD rata-rata sebesar 399,22 mg/L dan TSS rata-rata sebesar 249,33 mg/L. Setelah diolah pada reaktor A (Floating wetland + Constructed wetland (Bambu Air)), mampu turun menjadi rata-rata kadar BOD5 sebesar 76,33 mg/L, COD sebesar 144,11 mg/L L dan TSS sebesar 67,33 mg/L. Sedangkan pada reaktor B (Floating wetland + Constructed wetland (Melati Air)), mampu turun menjadi rata-rata kadar BOD5 sebesar 60,67 mg/L, COD sebesar 129,44 mg/L dan TSS sebesar 44,00 mg/L. Hasil yang diperoleh efisiensi penurunan kadar BOD5,COD dan TSS tertinggi terjadi pada reaktor B (Floating wetland + Constructed wetland (Melati Air)), BOD5 sebesar 53,76% atau 60,67 mg/L, COD sebesar 44,57 % atau 129,44 mg/L dan TSS sebesar 57,47 % atau 44,00 mg/L.

The Residents of Dukuh Menanggal Village have planted family medicinal plants, including lemongrass. But people do not understand the use of lemongrass plants into environmentally friendly organic carbolic acid. The purpose of this Community Service (PkM) activity is to optimally use lemongrass as an organic carbolic acid in order to increase economic value and make people aware of the importance of disinfectants during a pandemic condition like the current one. The method used to achieve the objectives of this activity is community empowerment regarding the use of yard land for family medicine gardens and empowerment of optimal land use to preserve the environment and prevent environmental pollution and climate change. The implementation of the PkM program includes: site surveys, preparation of facilities and infrastructure, coordination with the sub-district government, procurement of tools and materials, counseling and training, monitoring and evaluation. The target group is PKK women. The results obtained before the community service activities were that the residents did not know how to make carbolic acid as much as 57.1 and did not know the function of carbolic acid as a natural disinfectant as many as 71.4. While the results obtained after the service was carried out, residents knew how to make carbolic acid as much as 71.4 and knew the function of carbolic lemongrass as much as 80.9. The response from residents regarding this service is very good. Residents of Dukuh Menanggal Village, Gayungan District, Surabaya have started to feel the results of environmentally friendly organic carbolic products that can be used daily.