SULLAGE STABILIZATION POND SYSTEM FOR LIQUID WASTE MANAGEMENT IN RURAL AREAS BY Er. V.S. SIWACH, CHIEF ENGINEER PANCHAYATI RAJ PUBLIC WORKS, HARYANA AND Er. SHANKAR JINDAL, SUPERINTENDING ENGINEER PANCHAYATI RAJ PUBLIC WORKS, CHANDIGARH INTRODUCTION Disposal of waste water – a major problem in rural areas. Stagnant waste water leads to Unabated growth – wild grass, hyacinth etc. Unhygienic conditions Bad odour Breeding place for mosquitoes resulting in spread of diseases like dengue, malaria etc. VILLAGE PONDS – AN OVERVIEW Ponds in the villages were meant for cattles, clean water storage, ground water recharging etc. Existing ponds converted into cess pools due to • Discharging of effluents from streets/ drains • Deposition of sullage – inhibits percolation • Growth of aquatic weeds due to nutrient enrichment • Run-off from cow dung/ solid waste dumps around the pond Capacity of the existing ponds also needs to be increased. TYPES OF WASTEWATER Grey water Waste water from bathroom, kitchen (except toilet). 90 % of the waste water in villages is grey water. Requires less treatment than black water. Generally contain fewer pathogens. Black water Waste water mixed with waste from toilets. Requires biological or chemical treatment and disinfection before reuse. TECHNOLOGICAL OPTIONS Household level Management • Kitchen Garden with piped root zone system • Kitchen Garden without root zone system • Leach Pit • Soakage Pit TECHNOLOGICAL OPTIONS Community Level Management At public places on site • Plantation with intercepting chamber • Community leach pit • Soakway Channel • Simple process of reuse of grey water • Root Zone System TECHNOLOGICAL OPTIONS Off site Management • Drainage System for collection and transportation • Final Treatment - Sullage Stabilization Pond System - Screening, Sedimentation and Filtration system - Stabilization Tank System SULLAGE STABILIZATION POND SYSTEM The system has three components: Anaerobic Pond Facultative Pond Maturation Pond SULLAGE STABILIZATION POND SYSTEM SULLAGE STABILIZATION POND SYSTEM Sizes The sizes of the ponds have to be calculated to commensurate with the retention time and the quality of effluents discharging from the village Population Anaerobic Facultative Aerobic 1000 35’x24’x10’ 64’x21’x5’ 64’x21’x5’ 2000 37’x25’x10’ 90’x30’x5’ 90’x30’x5’ 3000 45’x30’x10;’ 110’x37’x5’ 110’x37’x5’ 4000 60’x40’x10’ 143’x47’x5’ 143’x47’x5’ Note: Sizes may be increased as per site conditions/ sizes of existing ponds SULLAGE STABILIZATION POND SYSTEM Anaerobic Pond Should have a depth of 10 feet. Grey water reaching this pond has high solid content. Retention Period - 2 days. Solids - settle at the bottom and are digested anaerobically. Partially clarified facultative pond. liquid – outflows into SULLAGE STABILIZATION POND SYSTEM Facultative Pond Should have a depth of 5 feet. Retention period is 3 to 5 days. Oxidation of grey water takes place. Upper layer - aerobic conditions. Lower layer - anaerobic conditions. Aeration from air through the surface SULLAGE STABILIZATION POND SYSTEM Oxidation due to oxygen liberated through photosynthetic activity of algae growing in the pond due to availability of plant nutrients, from bacterial metabolism in water and the incident light energy from sun. The pond bacteria utilize the algal oxygen to metabolise the organic content of grey water. SULLAGE STABILIZATION POND SYSTEM Maturation Pond Size and retention time - same as facultative pond. The stabilized water from facultative pond is led to this pond. Main function is destruction of pathogens. Conditions are wholly aerobic. GENERAL GUIDELINES Existing ponds, if in abadi area, be revived for clean water storage, wherever feasible. Intercept drains/ nalas - to receive effluents from streets/ drains and carry it away from the abadi area. New ponds be dug up at suitable sites (keeping in view natural gradient of terrain and direction of air flow) for storage and treatment of effluents. Wherever intercept drains/nalas are not feasible, existing ponds have to be remodeled for storage and treatment of effluents. CONSTRUCTION METHODOLOGY Diversion of waste water Draining out the pond De-silting of pond Construction of embankment Pipes and other fittings Provision of out flow for subsequent use in agriculture/ horticulture/ fish farming/ ground water recharging etc. Beautification and plantation. ACTION PLAN Coverage of some villages (minimum one village per block) in each district as pilot project with the financial assistance of State Government. Creating awareness, motivation, and sensitivity among Gram Panchayats/ Villagers to trigger the scheme. Total coverage in a Mission Mode with active involvement of PRIs and dovetailing of funds under MGNREGA, TSC, PRI fund, MPLADS, local contribution etc.